Indoor gas pipe installation
1 scope
This technology standard is suitable for the working pressure is not greater than 0.005 MPa indoor low pressure gas pipeline and equipment installation.
2 construction preparation
2.1 material requirements:
2.1.1 gas pipeline engineering using pipes, pipe fittings, such as packing material attached should comply with the current national related standards. Pipes, pipe fittings and accessory materials should have the factory certificate, to the site should also conduct re-inspection.
2.1.2 galvanized carbon steel and pipe fittings shall comply with design requirements of the specifications of the sort, inside and outside wall galvanized evenly, no rust, no impalement. Fitting unbiased clasp, buckle, threaded or Angle are not allowed to wait for a phenomenon. Pipes and pipe fittings shall have the factory certificate. Indoor gas pipe installation should try to use galvanized carbon steel pipe and pipe fittings.
2.1.3 carbon steel pipe, seamless steel pipe. Tubing shall not be bent, rust, not fly, double skin and uneven phenomenon.
2.1.4 valve should choose suitable for conveying gas medium in the existing national standards, and has good impermeability and corrosion resistance of the valve. General indoor use plug or ball. The valve specifications should comply with the design requirements. Its appearance requirements: the body casting, the surface is bright and clean, no crack, air hole, shrinkage, slag eye; Sealing surface shall not have any defect, surface roughness and alignment to meet the requirements of the standard; Straight through connecting flange of the valve sealing surface should be parallel to each other; Straight through the valve of the center line of the female adapter should be in a straight line, must not exceed 2 ° angular deviation; Right Angle type valve inside the center line of the nipple not verticality, the deviation shall not be more than 2 °; After packing into the height and tightness, should maintain seal and not hinder stem movement, and had certain adjustment allowance; Plug valves shall be position mark on the plug, and the full open to full shut down within the scope shall be limited to 90 °. Flexible switch, close tightly, packing in good condition without leakage, the handwheel complete without damage. To the valve should also be a strength test and leak test. Failed the test shall not be installed.
2.1.5 pure rubber hose should be oil resistant.
2.1.6 gas meter: household skin membrane is commonly used in household gas meters. This table can be divided into four types: artificial gas meters, natural gas meter, liquefied petroleum gas (LPG) tables and is suitable for the above three common table of gas. When installation should be clear type. Industrial and public buildings gas measurement by roots meter, it has the advantage of small volume, large flow, can be used for high gas pressure measurement. The new table installation must meet the following conditions: have the factory certificate; Appearance inspection intact; From the factory inspection date or to check the date shall not exceed six months; Factory has a production license.
Gas stoves 2.1.7 life:
2.1.7.1 household gas burner, divided into monocular and binocular two forms. As stipulated in the ministerial standard is as follows:
A type. Household gas burner according to the types of gas can be divided into: artificial gas burner, natural gas, liquefied petroleum gas burner and apply to two or more gas in the gas burner. Household gas burner model should include the following contents: the household gas burner with the Chinese phonetic alphabet code said: R - artificial coal gas; T - natural gas; Y - liquefied petroleum gas (LPG). Eye of the oven number in Arabic Numbers: 1 - monocular stove; 2 - eyes stove; 3 -- three eyes.
B home basic parameters of gas burner. Gas burner for gas pressure regulation is: before the artificial coal gas is 0.8 ~ 0.8 kPa; Natural gas is 2.0 ~ 2.0 kPa; Liquefied petroleum gas (LPG) 2.8 ~ 3.0 kPa. Household gas burner main burner fire rating of the heat load shall not be less than 10.5 MJ/h (megajoule/hour).
C main technical requirements:
Uniform (a) the burner flame, lit a fire hole, the flame should be spread across all the fire hole in 4 seconds.
(b) within the scope of gas in 0.5 ~ 1.5 times the rated pressure and gas composition is within a certain range, the flame should be stable, may not produce Huang Yan, tempering, fire off and away from the flame.
(c) when the artificial gas burner pressure of 30 pa, gas stove before the pressure is 80 pa, liquefied petroleum gas stove before 120 pa, the burner flame shall not be tempered or stall.
(d) the surface temperature of the gas burner parts should be less than the following values:
Hand must contact area when operating Room temperature 30 ℃ and
Operation may be touching part At room temperature and 70 ℃
The part of the operation is not easy to contact At room temperature and 110 ℃
The valve shell temperature 40 ℃
Dry cell at room temperature 20 ℃
Voltage components and wire room temperature 50 ℃
Hose connection at room temperature 20 ℃
(e) shall be safe and reliable electric ignition device, at startup, 10 times the number of light shall not be less than 8 times, and shall not be two consecutive doesn't work.
(f) the valve and the knob of the gas burner at room temperature, or under the highest working temperature, should be flexible.
(g) button "on" and "off" position should be clearly marked and directions, and should limit and self-locking device (switch body exposed without self-locking device).
D residents live in kitchen should comply with the household gas burner (CJ14-83) standards.
2.1.7.2 public kitchen ovens
Including cooking stove the Chinese gas cooking stove (GB7824-87), steamed rice cooker, pancakes, cookstoves, oven, stove oven.
2.1.7.3 ovens ovens:
Including canteen oven, infrared pastry baking ovens, roast duck oven, etc.
2.1.7.4 boil water kitchen:
Including the boiling furnace, automatic water heater (" domestic instantaneous gas water heater (GJ6932-86) "), automatic boiling water and etc.
2.1.7.5 refrigeration kitchen:
Group of the gas cooler.
2.1.7.6 heating air conditioning kitchen:
Including cold box, cainuanlu, infrared radiation heating stove, etc.
2.1.7.7 other kitchen:
Including washing machine, dryer, dishwasher, gas irons, gas lamp, etc.
Above have the production license and the factory quality certificate, and before installation in proportion to their different specifications and the statutory inspection unit, meet the requirements to install.
2.1.7.8 other materials: steel, round steel, pipe clamp, bolt, nut, lead, hemp, tape, packing, electric welding rod and so on. When choose, should comply with the design requirements.
2.2 the main equipment:
2.2.1 machinery: set of silk machine, grinding wheel hand saws, bench drill, electric hammer, electric drill, electric welding machine, electric hydraulic test pump etc.
2.2.2 tools: set of wire plate, pipe wrench, pressure pliers, welding tools, hand saw, hammer, adjustable wrench, chain tongs, simmer bending machine, hand pump, twisting chisel, hammer, broken clamp, shear, etc.
2.2.3: other level drops, U type pressure gauge, line, row gauge, steel tape, square, string cable, pressure gauge, etc.
2.3 operation conditions:
2.3.1 underground pipeline, must be in the room subsoil backfill compaction or digging into the tube bottom elevation, clean up along the pipeline position and stay at pipe wall or installed casing pipe hole, the hole size and casing specifications conform to the requirements, the correct coordinates and elevation.
2.3.2 dark pipe should be installed at the end of the trench cover ditch cover before or at the end of the condole top closed for installation, the steel bracket shall be installed and meets the requirements.
2.3.3 with Joe, crane main installation must be carried out after completion of the installation of layer structure of the roof. Along the pipeline installation location of the template and clean up debris, elevator parts are installed firmly, location is correct.
2.3.4 riser installation shall be carried out after completion of the main structure. High-rise buildings after the installation conditions to achieve the appropriate insert. Elevation lines, each layer shall have clear dark shaft pipes installed, should be put inside the shaft of the template and clear out clutter, and have a fall prevention measures.
2.3.5 branch pipe installation should be finished in wall masonry, metope is decorated at the end of the former (including dark outfit branch).
2.3.6 gas equipment should be in all kinds of bracket device has been installed, the decoration project has been completed, inside the room to install again.
3 operation process
3.1 process:
Prepare to prefabrication, mains installation > installed riser - > branch >
Gas meter installation to pipeline pressure test, pipeline purging and anti-corrosion, brush oil
3.2 installation preparation: familiar with drawings, carefully determined according to the construction plan of the construction method and specific measures of technical clarificaiton ready for work. See figure can close professional equipment and decoration construction diagram, check whether all kinds of coordinates and elevation of the pipe is overlapping, pipe used space arrangement is reasonable. There is a problem in a timely manner and the design and research to solve the people concerned, do a good job changes regarding the record. Cooperate with civil engineering construction progress, reserve a slot hole and installation of embedded parts and the casing.
3.3 prefabrication: according to the design drawing to draw branch pipe, pipe diameter, taper and reserved nozzle, valve position construction sketch, such as marked in the structure of the actual installation location, according to the tag section measure the accurate size of the actual installation, record in construction sketch, then measured the size of the precast processing according to the sketch (broken tube, sets), in part, straightening, proofreading, grouped by section number (see 1-1) process.
3.4 main installation:
3.4.1 track in construction sketch, by section processing operations, including: broken tube, cover silk, upper parts, straightening, check the good size, according to the numbering system grouping, packed neatly.
3.4.2 installation card frame, according to the rules and regulations of the design requirements or span installation. Elevator installation, the hanging rod according to the slope to the first order, and wear on the steel bracket, rings according to space position set on the tube, then put tube is raised on bolt screw nut, fixed the pipe. When installed on the bracket of the pipe, the pipe first in place on the bracket, the u-shaped tube installed card in the first quarter, then install the tube in the second quarter, after each section tube according to this, the fastening bolts.
Rule 3.4.3 gas introducing pipe installation: gas introduced tube shall not be laying in the bedroom, bathroom, closed the basement; It is forbidden to laying in flammable, explosive goods warehouse, corrosive medium room and distribution room and substation room, in cable trench, heating ditch, flue and into the duct area, and shall meet the following requirements:
3.4.3.1 introduction of pipe nominal diameter shall not be less than 40 mm. Introducing pipe slope should not be less than 0.003, the slope to the mains. Introducing the tube through the building foundation, should be set in the casing, consider building subsidence, casing should be bigger than introducing pipe number two. Casing size could be selected according to table 1-43, between the casing and the pipe crack in asphalt oil hemp yan, hot asphalt sealing. Introduction of tube wall thickness of 3.5 mm or more seamless steel tubes should be adopted. Away from the building exterior wall within 1 m of underground pipe and casing is not allowed to have a joint, the use of heat bend pipe bending processing.
Wall casing size (mm) table 1-43
Gas pipe nominal diameter DN 25 32 40 to 50 70 15 to 20
Casing pipe nominal diameter DN 32 40 to 50 to 50, 70, 80, 100
3.4.3.2 general admission into pipe in heating ditch, from the ground introduces indoor outdoor, in the tube is 500 mm from high indoor ground pipe using seamless pipe the whole tube against bending, strengthen the anticorrosion layer, wall tube and steel casing. Outdoor pipe roof and wall or into the 3-way plug welding, outdoor pipe bricklaying plaster protection inside and outside, inside filled with expanded perlite insulation, top cover plate.
3.4.3.3 introduced tube if there is no warm air inlet channel or other barriers, by the underground directly into indoor, outdoor pipe using seamless pipe the whole tube heat bending, strengthen the anticorrosion layer, through walls and in the ground and steel casing, inside and outside wall bushing out metope 50 mm. In the ground, casing out of the ground 50 mm, here with the floor is flat.
3.4.3.4 high-rise building of the gas is introduced into tube wear building foundation, the settlement of buildings should be considered, the influence of the inlet pipe should be reserved in the wall hole, the upper press building is the largest settlement shall prevail, retain a certain clearance to enter indoor, on both sides along the pipe build by laying bricks or stones in indoor side closed tube well. Then fill with 4 asphalt asphalt oil hemp wall, plaster plus steel wire net.
3.4.3.5 residential users should as far as possible the introduction of the tube directly into the kitchen, can also be introduced by staircase. The site of the introduction of the public facilities, should try to lead directly to the installation of gas equipment or gas meter room.
3.4.4 installation should be into the door to introduce main pipe or branch road after beginning, to check before loading in the lumen and clean. Head office with good lead wrapped in silk jute or wrapped ptfe packing belt, one at the end of the flat pipe, one tube relatively fixed on the thread on the outlet, slowly turning into the clasp, grabbed a pipe wrench with a former section pipe fittings, turn the tube to a pipe wrench with another moderately elastic, aim at the tag when straightening, request thread is exposed for 2 ~ 3, hemp head in accordance with this method and clear it loaded so far (pipe through the expansion joints or groove, must wear good steel casing).
3.4.5 interior horizontal piping in the corridor outside the stairs or from indoor ground not less than 2.2 mm, is apart from the ceiling is not less than 0.15 m. That the slope of the horizontal tube should be guaranteed to be 0.001 ~ 0.003, the slope to the requirement: slope to the pipeline and burner separately by the gas meter.
3.4.6 indoor gas pipe and other indoor plumbing, the smallest of parallel or intersecting interval of construction equipment shall be in accordance with table l - 44 and given in table 1-45.
Indoor gas pipe and other pipe and equipment between the parallel interval (m) in table 1 to 44
Lighting cable
Ming set have
The distance from 0.1 0.1 1.3 0.1 0.05 0.3
Indoor gas pipe and other cross net distance between pipeline and equipment (m) - 45 in table 1
Other pipeline and equipment to drain the steam pipe Ming fu lighting apply power line electric meter, insurance, and the switch
Distance from 0.01 0.01 0.015 0.15 0.01
When parallel or cross interval can not meet the above requirements, should handle for protection or insulation.
Adjacent buried gas pipe and other pipe, cable, etc. The minimum level, vertical distance are shown in table 1-46-47, table 1 and table l - 48.
3.4.7 indoor pipe wall or floor, should be put in the casing, the casing can not have joint. Wear casing wall should be leveled, with walls on both sides of the length of the floor board casing should be higher than upper floor 30 ~ 50 mm, lower part and the floor level.
3.4.8 pipe fixed Angle steel is commonly used in U word card, its spacing should comply with the provisions of the table 1-49. And each floor of the room
Buried gas pipe and other adjacent pipeline and cable between the minimum horizontal interval (m) in table 1-46
The serial number of project level interval
1 to give 1, drainage pipes
The outer wall of pipeline 1 of 2 and heating tube
3 and 1 power cable
Directly buried
And communication cable laying within the conduit
Buried gas pipe and other between adjacent pipeline and cable, the minimum vertical clearance (mm) - 47 in table 1
Serial number project of vertical interval (when there are casing, casing)
1 to give 150, drainage pipes
2 with the heating pipe of bottom or the top 150
Directly buried 600
With electric cable laying in intraductal 150
Gas pipe and other adjacent pipe and wire, electric meter box, electrical switch the safety distance between (m) - 48 in table 1
category
To and to drain pipe heating and gas
Hot water supply line spacing of gas pipe and electric
Line spacing and gas pipe
Panel distance gas pipe and electric drive
Close the distance and joint
In the same plane acuity 0.05 acuity 0.05 0.3 or 0.15 or higher
Different plane acuity 0.01 acuity 0.02 0.3 or 0.15 or higher
The gas pipe clamp distance (m) - 49 in table 1
Gas pipe diameter (mm) horizontal vertical pipe
DN25 2.0 3.0
DN32 (3.0 ~ 4.0
Gas riser adding at least one fixed clamp, drooping in front of the stove pipe set at least one clip, such as a sagging pipe when the revolving door, can set two clip.
3.4.9 indoor gas pipe valves, acuity DN65, generally USES the gas gate valve; Pipe diameter or less (with blue or tighten the revolving door. Total valve inlet pipe generally installed on the total riser, apart from the ground 1.5 m, stair inlet total riser valve apart from the ground 1.7 m. When the flow rate of 3 m3 / h or less, the table should be set before a revolving door, after table before to burner, not the other valves; When traffic 20 m3 / h or less gas meter, the table set before the valve, can be used as a dining room and other public welfare facilities of the intake valve; When gas consumption 57 m3 / h or less or not interrupt gas users, gas meter bypass valve should be installed, and at the same time adding gas meter outlet valve; From the total main indoor gas to each branch pipe should be installed on a branch of canteen valve; High-rise buildings (more than ten and ten layers of homes and buildings more than 24 m other civil structures) tube introduced in the starting point should be set to cut off the valve, outdoor indoor gas pipe in addition to the installation of a total valve, every six layers in total on the riser should be add a block valve, indoors the finish should be set up emergency cut-off valve; Have more than two segments riser, can be in each vertical pipe set on a valve, if the number of each block valve with more than 30 families, when appropriate, open the valve. Gas taut type installed on the revolving door, revolving door axis should be parallel to the wall; Installing a pressure type revolving gate, only allowed its axis and the vertical metope.
3.4.10 welded steel pipe welding, in which the pick pipe straightening, clean up tube chamber, the pipeline to the installation site, the installation program from the first day. Find is the pipe in place, on the nozzle to obligate mouth direction accurately, after looking for straight with spot welding, pipe diameter of 50 mm or less 2 points, the following welding pipe diameter above 70 mm spot welding at 3 or higher), then in accordance with the requirements for welding welding, after welding should guarantee the pipeline integrity.
3.4.11 pipeline installation, check the coordinates, elevation, pipe diameter changes and reserve the position is correct, then find straight, use level calibration check slope, adjustment qualified after hanging a bolt u-shaped card, make its moderately elastic, right.
3.4.12 straighten or installed pipe wear casing structure, fill the hole wall tube, obligate mouth should add good temporary pipe plug.
3.5 the riser installation:
3.5.1 track of check whether each layer of the reserved hole location is vertical, messenger wire and carved eyes, clip. Preformed pipe in number order can be shipped to installation location.
3.5.2 before installation, first remove the valve cover, a steel casing wear on the tube first, according to the number from the first day to start the installation. Coated lead bound mahjong riser on the interface rotation into the buckle and a tube cone biting fitting, a screw pipe, a pipe wrench screw to moderately elastic, straightening marking requirements, thread exposed 2 ~ 3, obligate mouth a right, and pure hemp head.
3.5.3 check each item to keep mouth elevation and direction of the riser is accurate, such as a right. Will be planted in advance good release pipe clamp, screw down the bolt inside put the tube into the card, with derrick, falling from the first day to find good verticality, centralizer steel casing, finally cooperate with civil engineering in the hole, obligate mouth must add good temporary plug. The riser door installation should be toward to facilitate operation and repair.
3.5.4 gas riser generally equipped inside the kitchen or stairwells. When indoor riser pipe diameter is not more than 50 mm, usually every other floor furnish a union, location is not less than 1.2 m off the ground. In case of valve, must furnish union, behind the location of the union shall be located in valve. A diameter of 50 mm or not set union in the pipeline.
3.6 pipe installation:
3.6.1 check gas meter installation position and riser obligate mouth is accurate. Measure branch pipe size and the size of the lamp fork bending.
3.6.2 branch pipe installation, volume, the size of the branch pipe, and then broken tube, wire, heat lamp fork bending and straightening. Will light the fork or short tube bending two lead to tie up linen, pack good oil, gas meter, and pure hemp head.
3.6.3 sank proofreading branch pipe line steel, spirit level, slope of the peace wall spacing size, a total review of the riser and gas meter for mobile, qualified after substituting branch under the gas meter. System according to the rules and regulations of design or the pressure test and purging, purge qualified after remove the connecting pipe before commissioning, installation of gas meter. After passing the acceptance formalities.
3.7 gas meter installation:
3.7.1 resident households should be put in a gas meter: collective, business, business users, each independent accounting units at least should be put in a table.
3.7.2 gas meter before installation must meet the following conditions:
3.7.2.1 gas meter factory certification, manufacturers have the production license, the table by the statutory inspection unit;
3.7.2.2 manufacture date no more than four months away, such as more than, is subject to statutory inspection unit;
3.7.2.3 without any obvious damage.
No collision in the process of gas meter installation, inversion, rap, there is no rust, debris, oil and other fall into the instrument.
Table 3.7.3 skin membrane installation must be a right, bottom should be supported. Gas meter with the surrounding facilities of level interval as shown in table 1 to 50.
Gas meter with the surrounding facilities level net (m) table 1 to 50
Facilities list low-voltage family dining room to kitchen oven boiled water metal chimney brick oven
Horizontal distance of 1.0 0.3 0.7 1.5 0.6 0.7
3.7.4 the skin membrane table, installation should follow the following provisions:
3.7.4.1 skin membrane table installation height can be divided into:
High table installation: the bottom of the table from the height not less than 1.8 m;
A table in the installation: the bottom of the table from the height not less than 1.4 ~ 1.4 m;
Low table installation: the bottom of the table from the net height should not be less than 0.15 m.
3.7.4.2 install skin membrane in the aisle table must be installed according to the high table; Indoor skin membrane table is given priority to with a table in the installation, low table is complementary.
3.7.4.3 skin membrane table on the back of the net from the wall from 10 to 50 mm.
3.7.4.4 multiple skin membrane table installed on the wall, the net distance between table and table not less than 150 mm.
Table 3.7.4.5 installed a skin membrane, generally only install a cock in front of the table.
3.7.5 public building user's gas meter installation points are as follows:
3.7.5.1 installer: introducing the tube and fixed installation, and installation of riser and total valve, to by-pass pipe and gas meters on both sides of the pipe.
3.7.5.2 table dry skin membrane installation method: flow of 20 m3 / h, 34 m3 / h gas meter can be installed on the wall, under the table shapes, such as 40 x 4 Angle bracket. Flow rate is more than 57 m3 / h gas meter can be installed in the brick in the ground, brick machine is 0.1 ~ 0.2 m, should establish the by-pass pipe. Table on both sides of the piping and by-pass pipe connection for wire, welding may be adopted.
3.7.5.3 roots table (waist drum table) installation method:
Before installation, must wash out table measurement indoor rust-proof oil, its method is to use gasoline from the inlet side of table, pour outlet with containers, repeatedly, until know.
Roots table must be installed vertically, high to low. And filter and the table should be directly connected. Filters and roots dust cover at the ends of the table should not be removed before installation.
Roots table measurement need to correct the pressure and temperature, the pressure and temperature measuring points generally set up before the instrument.
Installed, check first ventilation pipes, valves, meters and other installation parts with and without leakage phenomenon, after confirm all good seal, oil plug on the twist in the table below, again add lubricating oil (oil cannot be more than the market regulation scribed line on the specified window) tighten the screw, then slowly open valve, make the table, watch list pointer is uniform smooth running at the same time, if there is no abnormal phenomena can work normally.
3.8 indoor gas pipeline pressure test:
3.8.1 indoor gas pipe should be pressure and tight degree of two kinds of test, the test medium for compressed air or nitrogen.
3.8.2 within residential gas test (test temperature should be at room temperature)
3.8.2.1 test range:
Pressure test for total valve inlet pipe to each focal line section between the revolving door. Do not include gas meter, when testing the applied short pipe to pipe loading forms a tentative unicom. Leak test, in the above range increases all kitchen equipment.
3.8.2.2 pressure test:
Pipeline system on 0.1 MPa, check the weld and tapping with soap and water, no leakage, pressure is not fell sharply at the same time as qualified.
3.8.2.3 closely degree of test:
Within the piping system does not install gas meter, down to 700 mm water column, observed for 10 minutes, pressure drop is less than 20 mm water column for qualified; Within the piping system is equipped with gas meter, down to 300 mm water column, watch for 5 minutes, the pressure drop is less than 20 mm water column is qualified.
3.8.3 dining room, boiler room of the gas test:
3.8.3.1 test range:
From the inlet pipe total door to focal (boiler burner) before the revolving door between the pipes.
3.8.3.2 pressure test:
Low pressure pipe test pressure is 0.1 MPa, medium pressure pipe test pressure is 0.15 MPa, check with soap and water interface, no leakage, test pressure nor fell sharply at the same time, it is qualified.
3.8.3.3 closely degree of test:
Low pressure test pressure pipeline system for 1000 mm water column to observe for an hour, such as pressure drop less than 60 mm water column is qualified. Medium pressure pipe test pressure of 1.5 times the working pressure, but not less than 0.1 MPa pressure table, after filling test should be in the pipeline for 3 h to observation, such as the pressure drop is less than 1.5%, an hour is qualified.
3.8.3.4 tight gas meter test:
Test shall be carried out after the pipe closely degree qualified, testing pressure is 300 mm water column, observe 5 mm, less than 20 mm water column pressure drop for qualified.
3.8.4 liquefied petroleum gas pipeline test:
3.8.4.1 test range:
Full system by a pressure reducer export revolving door, pressure reducer, gas collector side for the high pressure section, on the other side to low voltage.
3.8.4.2 withstand voltage test.
Do withstand voltage test, high pressure section in the closing good export pressure reducer, the revolving door made up to 1 mpa, check all the interface with soap and water, no leakage for qualified.
3.8.4.3 closely degree of test:
After test pressure to 700 mm water column, watch the 10 min, pressure drop is less than 20 mm water column is qualified.
3.9 pipe purging: purging should be performed without gas meter, pipeline is in after the test can do purge, compressed air or nitrogen purge application for continuous, shall ensure that there is plenty of traffic. Blow the acceptance formalities after washing clean.
3.10 pipe derusting and anti-corrosion:
3.10.1 outdoor pipeline anticorrosion treatment:
According to the location of pipe laying soil corrosion degree of the pipes; The use of the pipeline importance and choose different insulating layer. In pipeline crossing the stray current region, should take measures to ensure the good use of. Commonly used asphalt anticorrosive coating, and its structure are shown in table 1-51, material consumption are shown in table 1 to 52 into strengthening anticorrosion and strengthen. General soil using strengthening anticorrosion. Under the condition of the soil corrosion is higher, or for crossing the river, the major roads, a top tube and casing or crossing the channel of gas pipeline in strengthening anticorrosion.
Asphalt coating level and structure of table 1-51
Each layer of asphalt thickness of the glass cloth
Total thickness (mm)
(mm)
Strengthen the anticorrosion primer - tar - glass cloth - - glass cloth - tar -
1.5 - tar - glass cloth covering material is six
, strengthen the anticorrosion primer - tar - glass cloth - - glass cloth - tar -
Glass cloth, asphalt, glass cloth, asphalt, covering material material 1.5 9
Outdoor pipeline oil bitumen coating construction requirements are as follows:
3.10.1.1 derusting, must remove the rust and other impurities, then clean the surface, with metal color.
3.10.1.2 primer: after cleaning the surface of the pipe should be dry, clean, can besmear to brush paint, primer coating should be smooth, no bubbles, clots, flow mark, defects such as blank.
3.10.1.3 melting bitumen: clean water, do not contain impurities, three indicators (penetration, ductility, softening point). Boil asphalt temperature at 200 ℃ or so commonly, highest do not exceed 240 ℃.
Dry rear can pour 3.10.1.4 casting bitumen coating: primer with asphalt.
3.10.1.5 bandage glass cloth: when bandaging, must use the dry glass cloth. Glass cloth edge for 10 ~ 15 mm, the lap length is 50 ~ 80 mm. Glass cloth penetration rate shall be 95% above, forbidden area of more than 50 mm x 50 mm
In the blank.
3.10.1.6 covering: the bandage should be closely moderate, no wrinkle, the phenomenon such as shell, pressure evenly.
3.10.1.7 coating quality inspection:
Per meter pipeline anticorrosion materials with scale table 1 to 52
Tube diameter DN40 (DN80 DN100 6 DN200 DN250 12 DN350 DN400 DN450
4 # asphalt (kg) 1.50 1.86 2.81 3.35 4.85 5.74 7.13 4.85 9.76 11.05 12.34
Kaolin (or talcum powder) (kg) 0.25 0.32 0.48 0.57 0.83 0.97 1.12 0.83 1.65 1.87 2.09
Glass cloth (m2) 0.23 0.29 0.43 0.57 0.68 0.88 1.14 0.68 1.57 1.77 1.98
Gas (kg) 0.128 0.155 0.230 0.128 0.375 0.485 0.624 0.155 0.862 0.974 1.080
4 # asphalt (kg) 2.34 2.76 4.11 5.12 7.44 8.80 10.92 7.44 14.96 16.82 18.83
Kaolin (or talcum powder) (kg) 0.40 0.47 0.71 0.86 1.25 1.48 1.84 1.25 2.51 2.82 3.15
Glass cloth (m2) 0.48 0.61 0.89 1.07 1.38 1.78 2.30 1.38 3.16 3.56 3.98
Gas (kg) 0.244 0.303 0.441 0.244 0.697 0.899 1.16 0.303 1.590 1.800 2.000
Note: (1) asphalt emperor grease formula for: room temperature, 4 # asphalt: kaolin (or talcum powder) = 85, 15 (weight ratio)
(2) cold priming oil formula is: 4 # asphalt: gasoline (volume ratio) = 1:3.
Chase a appearance: use visual check step by step a root, surface should be smooth, no bubbles, pits, wrinkles, tumors and other defects.
B: the thickness according to the design requirements, the total thickness should comply with the provisions of the table 1-28.
Check, every 20 a selectiving examination, each measuring three section, each section should be measure up, down, left, right four points, and will be subject to the thinnest points. If not qualified, two selectiving examination again. When one of them is still not qualified, are all not qualified.
C bond: anticorrosive coating on a cutting Angle is 45 ° ~ 60 ° incision, from the Angle of cutting edge tearing area of 30 ~ 50 cm2, not easy to tear and rip after adhesion on the surface of the steel tube, the first layer of asphalt accounted for 100% of the area of the tear is qualified.
According to the above methods every 20 spot check the other, each measuring point, if not qualified, then two selectiving examination, one of them is not qualified, are all not qualified.
D coating insulation: electricity spark leak detector for testing, not dozen spark as qualified, the minimum leakage voltage according to the following formula:
U = 7840
Type in the U - leakage voltage (V);
Delta - coating thickness (arithmetic mean of the measured number) (mm).
(a) every 20 root a selectiving examination, measured from the pipe end to the other end, if not qualified, smoking a root again, one of the root is unqualified, is all not qualified.
(b) prior to backfill soil, the construction is put good anticorrosion coating pipeline check again, from the pipe head end to end, found that the strike, must be repaired.
E repaired mouth, patching, repairing, patching anticorrosive coating structure and materials used shall be the same as the original pipeline anticorrosion coating. Repairing, each layer of glass cloth should be the original pipe end asphalt coating tower after summer-planting place more than 50 mm long; Fill quickly for damage surface diameter greater than 100 mm above, should according to the corrosion layer structure of patching, less than 100 mm, asphalt repair available.
F for asphalt anticorrosive coating insulation pipe, backfill soil after have to use a coating anticorrosive layer leak detector leak detection, found to damage the wound, must repair the qualified.
G to the above-mentioned quality standard, must list record, and save for future reference.
3.10.2 indoor gas pipe and accessories brush ZhangDan derusting processed oil, silver or gray paint two way.
3.11 residents with kitchen installation:
3.11.1 residents life gas should be used in low pressure gas. Low-pressure burner pressure rated as: gas 2 kpa. The artificial coal gas 1 kpa.
3.11.2 install gas cookers room should satisfy the following conditions:
3.11.2.1 should not be installed in the bedroom, indoor underground. If use the bedroom apartment when the kitchen, should be separated by a door. Kitchen should have natural ventilation and natural lighting, there is a direct pass outside the doors and Windows or vents, room height not less than 2.2 m.
3.11.2.2 refractory is not lower than second class, when not meet this standard, can be in the kitchen on both sides of 800 mm and 100 mm below range, labeled with incombustible materials.
3.11.3 within the newly built residential kitchen allows the volume of heat load index, general take 580 w/m3.
3.11.4 civilian kitchen to provide installation, should satisfy the following conditions:
3.11.4.1 ovens should be placed on the refractory, hearth height is 650 mm.
3.11.4.2 when grafted between kitchen and table, the connection of the pipe diameter should not less than DN15mm, and should be equipped with a union.
3.11.4.3 ovens such as soft connection, the connection hose length is not more than 2 m, soft hose and the corrugated pipe joint, clamp fixed between the hose inside diameter should not be less than 8 mm, should not wear a wall.
3.11.4.4 public when several ovens and installed inside the kitchen, the net distance between oven and stove should be not less than 500 mm.
3.11.4.5 install where there is enough light, but should avoid drafts direct ovens.
3.12 public building user kitchen installation:
3.12.1 kitchen structure classification:
Assorted kitchen provides 3.12.1.1 steel structure, such as Shanghai gas meter factory production of kitchen for a while, mesa of iron plate, pipe type oven steamed rice cooker, fire tube type steamed rice cooker, iron rice cooker; Three-eyed oven gas appliance factory production, six eye focal pancakes, boiling furnace, furnace, etc., most of this kind of kitchen is provided by the manufacturer will stove body and burner as a whole, when installation should be according to the designed position field in place, the piping can..
3.12.1.2 mixed structure of kitchen is provided, such as large western kitchen, shell is steel or stainless steel and cast iron finished products structure, internal lining brick, according to design requirements of the oven and heat insulation heat preservation facilities, burners and piping installation.
3.12.1.3 brick oven: mainly include boiler (big cookstoves), high stove (cooking stove), the stove body should be the scene of this kind of stove masonry, then according to the need to make different specifications of the burner.
3.12.2 before burner piping:
3.12.2.1 high in front of the stove burner piping as shown in figure 1-53, if choose 8 tube (exergy), 13 tube (
Main exergy) of the riser burner, these two kinds of burner is single inlet pipe, and 15 mm diameter respectively into DN, DN20mm thread connection.
The union, when installation should be in to the outer edge of the burner into ZaoKou, clamp valve between the union and should be planted, before the stove pipe in high stove oven along the bottom.
3.12.2.2 boiler burner piping as shown in figure l - 54, if choose 18 pipe, 24 burner head inside and outside the circle is separated, double inlet pipe, the diameter is DN20mm threaded connections. Each valve control switch, its connection form as shown in figure 1-54 (a).
30 pipe, 33 riser burner for single inlet pipe diameter for DN25mm threaded connection, the connection as shown in figure 1-54 (b). The burner switch for the interlocker plug, respectively control the burner and pilot burner fire. Burner piping diameter for DN25mm, small fire DN10mm pipe diameter, and lead to the burner head, and ask the small fire in the hole above the burner riser fire hole 1 ~ 2 cm, when used to open the pilot switch, fire lit pilot fire, the fire and open interlock cock switch, automatic ignition burner.
3.12.3 riser burner installation requirements:
3.12.3.1 burner head center should be with up and down the center of the pot, the error is generally not more than 1 cm, in order to make sure not to burn pot.
3.12.3.2 burner head should keep level, in order to guarantee the vertical flame combustion.
3.12.3.3 control burner in the hole surface of depth from the bottom of the pot. In the Beijing area high riser of the oven burner general distance from bottom of the pot for 13 ~ 14 cm; The steamer this distance is commonly 17 ~ 19 cm. The total should have contact with outer flame of fire pot is advisable.
3.12 4 burner installation considerations:
3.12.4.1 burner material such as cast iron, pipe thread should conform to the requirements, the pipe when the strength should be uniform, in order to prevent the intake pipe crack.
3.12.4.2 burner is generally selected before the cock taut plug, when installation should be parallel to the direction of the axis of the cock and the oven body surface, is advantageous for the elastic tail nut, and maintenance.
3.12.4.3 because this kind of burner itself before the intake pipe without valve, and on the stove burner piping before a final control cock, cock is pipeline system to cock to burner section and the thread cannot test examination, only behind the combustion air can check leakage, therefore this period of the especially when installation should pay attention to the installation quality, in order to prevent the accident after aeration.
3.12.5 ovens for smoke evacuation requirements:
3.12 5.1 with the exhaust mouth gas cookers, appropriate USES separate tunnels, buildings when multiple devices share a vertical flue, in order to prevent the smoke interference, should every other floor after a appliance; Appliance to horizontal flue, should be set up in the flue gas flow direction guide.
3.12.5.2 connect the gas stove of exhaust pipe design and installation requirements are as follows:
A row of the diameter of the pipe should be calculated, minimum shall not be less than the diameter of the gas cooker exhaust port;
B exhaust pipe shall not be through the bedroom;
C installation is lower than 0 ℃ room should make metal exhaust pipe heat preservation;
D utensils on the exhaust pipe shall be not less than 0.5 m vertical flue, can connect to the horizontal flue;
E level discharges flue pipe section should be not less than l % of the slope, slope to gas cookers, generally no more than 3 m in length, as proved by computing draught reliable, length of horizontal flue to greater than 3 m;
F exhaust pipe with flame retardant clear distance of metope should be not less than 10 cm, with plaster ceiling of interval is not less than 25 cm, exhaust pipe in the combustible and through the roof, should be in accordance with the requirements of fire properly handle;
G the export of exhaust pipe should be setting up hood.
3.12.5.3 brick flue technology main points:
A new build by laying bricks or stones flue must go through calculation, the old flue passes through accounting.
B flue should tightly solid, the lining is smooth;
C flue should have enough suction force, to ensure that the combustion chamber vacuum degree is not less than 5 pa mmH2O (0.5);
D build by laying bricks or stones inside the walls of the flue, can not have the level part, that can hold a necessary and horizontal line into at least 60 ° Angle of inclined flue, two vertical flue centerline distance shall not be greater than 2 m;
E from the furnace to each individual level of total flue flue, should be separated from each other at the entrance to the total flue, so as to avoid each other up gas, affect the draught.
3.12.5.4 flue roof above 1.0 m above, when installing the flue for ridge house, should be handled according to the height of the chimney progress.
3.12.5.5 if there is a higher buildings near the flue and affects a smoke, can consider to use mechanical smoke exhaust measures.
3.12.5.6 exhaust pipe is greater than 125 mm in diameter, when the length of horizontal flue big 13 m or the accumulation on the flue gas area, should be set break point.
3.13 the water heater installation. Should not be directly installed in the bathroom, water heater can be installed in the kitchen or other room, can also be installed in a well-ventilated aisle, but should not be installed outdoors.
3.13.1 to install water heater room shall meet the following requirements:
3.13.1.1 room height should be greater than 2.5 m.
3.13.1.2 volume of the room shall comply with the requirements of article 3.11 3.11.3.
3.13.1.3 water heater exhaust smoke shall meet the following requirements:
A direct exhaust type water heater installation room wall or window should be the top of the vent, as shown in figure l - 55;
B installation flue exhaust type water heater in the room should have the flue, as shown in figure 1-56.
C balance type water heater room outside wall installation, should be into the vent interface, figure 1-57.
3.13.1.4 room door or the bottom of the wall should be reserved to the area of not less than 0.2 m2 shutters, or between the ground and left the door height not less than 30 mm gap.
3.13.2 exhaust type water heater it is forbidden to install directly inside the bathroom, the flue exhaust type and balance type water heater can be installed in the bathroom. Install the flue exhaust type water heater must meet the following requirements:
3.13.2.1 bathroom volume should be greater than 7.5 m2;
3.13.2.2 the flue, exhaust pipe interface of the bathroom and the door shall comply with article 3.13 3.13.1 3.13.1.3, 3.13.1.4 requirements.
3.13.3 water heater installation location shall meet the following requirements:
3.13.3.1 water heater mainly in operation and maintenance convenience, not easy to be the part of the collision, the water heater in front of the space width should be greater than 0.8 m.
3.13.3.2 installation height of the water heater to the concept of fire water heater hole with the eye height qi advisable, generally from the ground 1.5 m.
3.13.3.3 water heater should be installed on the wall of the refractory, the net distance of water heater from the wall shall not be less than 20 mm, if the installation on the wall of the non refractory should pad to insulation board, insulation board should be bigger than water heater size 100 mm per side.
3.13.3.4 of gas water heater, water supply pipeline appropriate USES metal pipe, hose connection may be adopted. When using a hose connection, the gas pipe should use resistance tubing, conduit pressure pipe should be adopted. The hose length shall not be more than 2 m. Hose and clamp fixed joint application.
3.13.3.5 direct exhaust type water heater exhaust port and room ceiling distance shall not be less than 600 mm.
3.13.3.6 water heater and gas meter, the level of the gas range interval is not less than 300 mm.
3.13.3.7 upper water heater can not have electric power lines, electric equipment and combustible materials, water heater and electrical equipment level interval should be greater than 300 mm.
3.13.4 flue type water heater natural smoke exhaust device shall meet the following requirements:
3.13.4.1 in civil buildings, the installation of water heater shall have a separate room flue, when set separately flue with difficulty, also can set Shared flue, but exhaust ability and draught shall meet the requirements.
3.13.4.2 exhaust, the upper part of the safety of the water heater shall be not less than 0.25 m of vertical flue gas duct, pipe diameter shall not be less than the diameter of the water heater exhaust port.
3.13.4.3 flue should have enough suction and exhaust ability; Safe water heater exhaust outlet suction (vacuum) shall not be less than 3 pa mmH2O (0.3).
3.13.4.4 water heater shall not be used on the flue of the damper.
3.13.4.5 that the slope of the horizontal flue due to water heater at the slope of 1%. Horizontal flue length shall not be more than 3 m.
3.13.4.6 chimney outlet temperature of exhaust, shall not be lower than the dew point temperature.
3.13.4.7 chimney exports should set the cowl, its height should be higher than that of the structure of the positive pressure region.
Above the roof 0.5 m 3.13.4.8 chimney exports and should prevent rain and snow into the well.
4 quality standards
4.1 ensure projects:
4.4.1 pipeline leak test results and the compression strength of and tubing, type, specification must comply with the design requirements of the appliance.
Test method: all inspection. Check system or partitions (period) test record and certificate of quality and product certification.
4.1.2 slope of the pipeline must comply with the design requirements.
Testing method: according to the system every 30 m 2 selectiving examination period, straight section length less than 30 m not less than 1; Dividing walls of buildings, to partition is section number, spot check 5%. But not less than 5 segments. Quantity check or check with level, stay and ruler measurement record.
4.1.3 pipeline and pipe sit (pier) laid on permafrost and untreated scarification is forbidden.
Test method: all inspection. Observe or check the concealed work record. )
4.1.4 gas is introduced into tube and indoor gas pipe and other various types of pipeline, power cables, wires and electrical switch, the minimum horizontal, vertical and cross the net, must comply with the design requirements or table l - 53 ~ - 55 rules in table 1.
Buried gas pipe and other adjacent pipeline and cable between the minimum level of net from table 1-53
The serial number of project level interval (mm)
1 to give, and drain
2 the outer wall of pipeline and heating tube
3 and power cable is 1000
Directly buried
Inside the tube
Buried gas pipe and other adjacent pipeline and cable net minimum vertical distance between the table 1-54
Serial number project of vertical interval (when there are casing, casing) (mm)
1 and to drain, 150
2 with the heating pipe of bottom or the top 150
Directly buried 600
150 in the ducts
Gas pipe and adjacent wires and pipes, the distance between the meter box, electrical switch connector table 1-55
category
To give, drainage, heating and gas pipe
Hot water supply line spacing (mm) gas pipe and wire
The spacing distribution box (mm) and gas pipe,
Plate distance (mm) and electrical switches and gas pipe
Joint distance (mm)
The same level or a 50 to 50 or more
Different plane 10 or 20 or more
Inspection method: all inspection. Observation and feet quantity check. If no design requirements, must conform to the provisions on the following three tables.
4.2 the basic items:
2 galvanized carbon steel pipe and galvanized carbon steel pipe connections, for carbon steel pipe thread machining accuracy accords with national standard "pipe thread" regulation, thread clean and neat, no broken wire or wire, firm connection, pipe thread root has exposed, galvanized carbon steel pipe joint, no broken wires thread. Galvanized carbon steel pipe and pipe fittings galvanized layer without damage, thread showing a good corrosion resistance, interface exposed linen top defects.
4.2.2 carbon steel pipe flange connection should be parallel to the docking, close together, with the center line of the vertical pipe. Screw with nut length is consistent, and not more than half the diameter of the screw, nut on the same side, liner material conform to the requirements of the design and construction rules.
Holdings of galvanized carbon steel pipe welding joint straight, uniform weld waves, weld surface without nodules, slag inclusion and porosity. Weld strengthen face conform to the rules and regulations of construction.
4.2.4 pipe (,) and tube (block) of the installation should be constructed, correct embedding those strong, neat rows. Close contact with pipes.
4.2.5 valve installation: type, specification, pressure and leak test in accordance with the design requirements. Location, import and export in the right direction, firm connection, close, flexible for opening and closing, towards reasonable, surface clean.
4.2.6 installed inside a wall and floor of the casing requirement: floor inside the casing, the top above the ground of not less than 20 mm, the bottom and ceiling surface flush, and facing flat on both ends of the wall inside the casing, fixed firmly, flush nozzle, girth.
4.2.7 buried pipeline coating material and structure comply with design requirements and construction specifications, coil and pipe and stickup and firm, between each layer coil surface level off, without buckling, empty drum, defects such as sliding and sealing is lax.
4.2.8 piping and the types of the paint and metal stents coating times comply with the design requirements, good adhesion, without peeling, blister and the coating, the film thickness uniformity, colour and lustre is consistent, no flow and pollution phenomenon.
4.3 allowable deviation (table l - 56) of the project:
5 finished product protection
5.1 installed pipe shall not be used as support or scaffold board, shall not tread, the topkapi wearing not as a stress point for other USES.
5.2 interrupt construction, pipe must be temporarily closed.
5.3 pipe before spray to protect, prevent pollution of mortar pipes.
5.4 door of the handwheel when installation should be unloaded, before the completion of unified installation intact.
5.5 gas meter should have protective measures, to prevent damage, can be unified installed before commissioning.
5.6 have decorate the room, if you need to use gas welding, of metope, ground used iron block, to prevent pollution.
6 should pay attention to quality problems
6.1 pipe damage of galvanized layer. Due to the pressure and disrepair, tongs, long card pipes.
6.2 riser jilt highly inaccurate, due to the high exceed the allowable deviation or inaccurate measurement; Riser is apart from wall inconsistent or half bright and half dark, due to improper riser position arrangement, or partition wall displacement deviation caused by too much; The riser is not vertical, mainly carved plate hole, no messenger wire or plug hole squeezed position and cause. Corresponding measures should be aimed at these reasons.
6.3 casing out of the ground height of the riser is not enough, or fall under the roof or in the sleeve seam filler. This is mainly due to the plugging hole not cooperate well, check is lax or civil ground elevation, plaster is too thick to cause. Should strengthen the inspection, do well the cooperation.
6.4 support installation and firm, not use nail, destroy the civil decoration. This is due to the construction decoration completed before mounting bracket and pipeline, should avoid this kind of circumstance happening, do good cooperate with construction progress, support pipe installation should be completed before the decoration engineering construction, and banning the use of nail as fixed bracket, gas pipeline and equipment application planted wall pipe clamp is fixed.
Explosion indoor gas pipe installation and verify the allowable deviation method table 1-56
Will project allow deviation (mm) test method
1 take 10 use level, ruler,
2 the plus or minus ten arrows and feet high quantity check
Pipe diameter less than or equal to 100 mm (0.5)
Horizontal and longitudinal diameter greater than 100 mm 1 level, ruler,
Transverse direction of bending the pipe diameter less than or equal to 100 mm is not more than 13 arrows and quantity check
(more than 25 m) is not greater than 25
2 per 1 m
Total length of more than (5 m) is not more than 10
5 into the pipe valve valve center + 15 off the ground
At the bottom of the table plus or minus 15 feet off the ground check
6 gas meter table 5 from behind the wall surface
The center line of the vertical degree 1 quantity check messenger wire and ruler
15 feet away from surface of furnace + 7 gas mouth quantity check
+ 0.1 the delta
0.05 the delta with steel needle pierced
Insulation inspection
Coil or sheet 5 in 2 m by feet and
Spray coating, or other 10 wedge feeler check
Note: the delta pipe insulation layer thickness.
6.5 ma head cleaning not net, the reason is that operators is not clear in time.
6.6 gas such as without sulfur treatment, gas pipeline valve used iron shell core. Such as gas desulfurization process, also can use copper valve sealing ring.
7 should possess the quality of the record
7.1 the certificate of approval of materials and equipment; Send the test report and the construction of legal detection unit unit at the scene inspection records.
7.2 the pipe and equipment engineering records.
7.3 of pipeline and equipment inspection records.
7.4 piping and equipment of the individual and system strength test records.
7.5 piping and equipment strength of individual and system leak test record.
7.6 pipe purging records.
7.7 anticorrosion coating quality inspection records.
7.8 by building or construction unit to gas company apply for completion inspection and acceptance, gas company, in conjunction with the design, and other relevant units to test for the completion inspection and acceptance records.
8 according to the standard
8.1 the city gas pipeline engineering construction and acceptance standard "(CJJ33-89).
8.2 the household gas hot water fast installation acceptance procedures (CJJ12-86).
8.3 specification for design of city gas (TJ28-78) (trial).
8.4 the building heating health and gas engineering quality inspection evaluation standard "(GBJ302-88)
1 scope
This technology standard is suitable for the working pressure is not greater than 0.005 MPa indoor low pressure gas pipeline and equipment installation.
2 construction preparation
2.1 material requirements:
2.1.1 gas pipeline engineering using pipes, pipe fittings, such as packing material attached should comply with the current national related standards. Pipes, pipe fittings and accessory materials should have the factory certificate, to the site should also conduct re-inspection.
2.1.2 galvanized carbon steel and pipe fittings shall comply with design requirements of the specifications of the sort, inside and outside wall galvanized evenly, no rust, no impalement. Fitting unbiased clasp, buckle, threaded or Angle are not allowed to wait for a phenomenon. Pipes and pipe fittings shall have the factory certificate. Indoor gas pipe installation should try to use galvanized carbon steel pipe and pipe fittings.
2.1.3 carbon steel pipe, seamless steel pipe. Tubing shall not be bent, rust, not fly, double skin and uneven phenomenon.
2.1.4 valve should choose suitable for conveying gas medium in the existing national standards, and has good impermeability and corrosion resistance of the valve. General indoor use plug or ball. The valve specifications should comply with the design requirements. Its appearance requirements: the body casting, the surface is bright and clean, no crack, air hole, shrinkage, slag eye; Sealing surface shall not have any defect, surface roughness and alignment to meet the requirements of the standard; Straight through connecting flange of the valve sealing surface should be parallel to each other; Straight through the valve of the center line of the female adapter should be in a straight line, must not exceed 2 ° angular deviation; Right Angle type valve inside the center line of the nipple not verticality, the deviation shall not be more than 2 °; After packing into the height and tightness, should maintain seal and not hinder stem movement, and had certain adjustment allowance; Plug valves shall be position mark on the plug, and the full open to full shut down within the scope shall be limited to 90 °. Flexible switch, close tightly, packing in good condition without leakage, the handwheel complete without damage. To the valve should also be a strength test and leak test. Failed the test shall not be installed.
2.1.5 pure rubber hose should be oil resistant.
2.1.6 gas meter: household skin membrane is commonly used in household gas meters. This table can be divided into four types: artificial gas meters, natural gas meter, liquefied petroleum gas (LPG) tables and is suitable for the above three common table of gas. When installation should be clear type. Industrial and public buildings gas measurement by roots meter, it has the advantage of small volume, large flow, can be used for high gas pressure measurement. The new table installation must meet the following conditions: have the factory certificate; Appearance inspection intact; From the factory inspection date or to check the date shall not exceed six months; Factory has a production license.
Gas stoves 2.1.7 life:
2.1.7.1 household gas burner, divided into monocular and binocular two forms. As stipulated in the ministerial standard is as follows:
A type. Household gas burner according to the types of gas can be divided into: artificial gas burner, natural gas, liquefied petroleum gas burner and apply to two or more gas in the gas burner. Household gas burner model should include the following contents: the household gas burner with the Chinese phonetic alphabet code said: R - artificial coal gas; T - natural gas; Y - liquefied petroleum gas (LPG). Eye of the oven number in Arabic Numbers: 1 - monocular stove; 2 - eyes stove; 3 -- three eyes.
B home basic parameters of gas burner. Gas burner for gas pressure regulation is: before the artificial coal gas is 0.8 ~ 0.8 kPa; Natural gas is 2.0 ~ 2.0 kPa; Liquefied petroleum gas (LPG) 2.8 ~ 3.0 kPa. Household gas burner main burner fire rating of the heat load shall not be less than 10.5 MJ/h (megajoule/hour).
C main technical requirements:
Uniform (a) the burner flame, lit a fire hole, the flame should be spread across all the fire hole in 4 seconds.
(b) within the scope of gas in 0.5 ~ 1.5 times the rated pressure and gas composition is within a certain range, the flame should be stable, may not produce Huang Yan, tempering, fire off and away from the flame.
(c) when the artificial gas burner pressure of 30 pa, gas stove before the pressure is 80 pa, liquefied petroleum gas stove before 120 pa, the burner flame shall not be tempered or stall.
(d) the surface temperature of the gas burner parts should be less than the following values:
Hand must contact area when operating Room temperature 30 ℃ and
Operation may be touching part At room temperature and 70 ℃
The part of the operation is not easy to contact At room temperature and 110 ℃
The valve shell temperature 40 ℃
Dry cell at room temperature 20 ℃
Voltage components and wire room temperature 50 ℃
Hose connection at room temperature 20 ℃
(e) shall be safe and reliable electric ignition device, at startup, 10 times the number of light shall not be less than 8 times, and shall not be two consecutive doesn't work.
(f) the valve and the knob of the gas burner at room temperature, or under the highest working temperature, should be flexible.
(g) button "on" and "off" position should be clearly marked and directions, and should limit and self-locking device (switch body exposed without self-locking device).
D residents live in kitchen should comply with the household gas burner (CJ14-83) standards.
2.1.7.2 public kitchen ovens
Including cooking stove the Chinese gas cooking stove (GB7824-87), steamed rice cooker, pancakes, cookstoves, oven, stove oven.
2.1.7.3 ovens ovens:
Including canteen oven, infrared pastry baking ovens, roast duck oven, etc.
2.1.7.4 boil water kitchen:
Including the boiling furnace, automatic water heater (" domestic instantaneous gas water heater (GJ6932-86) "), automatic boiling water and etc.
2.1.7.5 refrigeration kitchen:
Group of the gas cooler.
2.1.7.6 heating air conditioning kitchen:
Including cold box, cainuanlu, infrared radiation heating stove, etc.
2.1.7.7 other kitchen:
Including washing machine, dryer, dishwasher, gas irons, gas lamp, etc.
Above have the production license and the factory quality certificate, and before installation in proportion to their different specifications and the statutory inspection unit, meet the requirements to install.
2.1.7.8 other materials: steel, round steel, pipe clamp, bolt, nut, lead, hemp, tape, packing, electric welding rod and so on. When choose, should comply with the design requirements.
2.2 the main equipment:
2.2.1 machinery: set of silk machine, grinding wheel hand saws, bench drill, electric hammer, electric drill, electric welding machine, electric hydraulic test pump etc.
2.2.2 tools: set of wire plate, pipe wrench, pressure pliers, welding tools, hand saw, hammer, adjustable wrench, chain tongs, simmer bending machine, hand pump, twisting chisel, hammer, broken clamp, shear, etc.
2.2.3: other level drops, U type pressure gauge, line, row gauge, steel tape, square, string cable, pressure gauge, etc.
2.3 operation conditions:
2.3.1 underground pipeline, must be in the room subsoil backfill compaction or digging into the tube bottom elevation, clean up along the pipeline position and stay at pipe wall or installed casing pipe hole, the hole size and casing specifications conform to the requirements, the correct coordinates and elevation.
2.3.2 dark pipe should be installed at the end of the trench cover ditch cover before or at the end of the condole top closed for installation, the steel bracket shall be installed and meets the requirements.
2.3.3 with Joe, crane main installation must be carried out after completion of the installation of layer structure of the roof. Along the pipeline installation location of the template and clean up debris, elevator parts are installed firmly, location is correct.
2.3.4 riser installation shall be carried out after completion of the main structure. High-rise buildings after the installation conditions to achieve the appropriate insert. Elevation lines, each layer shall have clear dark shaft pipes installed, should be put inside the shaft of the template and clear out clutter, and have a fall prevention measures.
2.3.5 branch pipe installation should be finished in wall masonry, metope is decorated at the end of the former (including dark outfit branch).
2.3.6 gas equipment should be in all kinds of bracket device has been installed, the decoration project has been completed, inside the room to install again.
3 operation process
3.1 process:
Prepare to prefabrication, mains installation > installed riser - > branch >
Gas meter installation to pipeline pressure test, pipeline purging and anti-corrosion, brush oil
3.2 installation preparation: familiar with drawings, carefully determined according to the construction plan of the construction method and specific measures of technical clarificaiton ready for work. See figure can close professional equipment and decoration construction diagram, check whether all kinds of coordinates and elevation of the pipe is overlapping, pipe used space arrangement is reasonable. There is a problem in a timely manner and the design and research to solve the people concerned, do a good job changes regarding the record. Cooperate with civil engineering construction progress, reserve a slot hole and installation of embedded parts and the casing.
3.3 prefabrication: according to the design drawing to draw branch pipe, pipe diameter, taper and reserved nozzle, valve position construction sketch, such as marked in the structure of the actual installation location, according to the tag section measure the accurate size of the actual installation, record in construction sketch, then measured the size of the precast processing according to the sketch (broken tube, sets), in part, straightening, proofreading, grouped by section number (see 1-1) process.
3.4 main installation:
3.4.1 track in construction sketch, by section processing operations, including: broken tube, cover silk, upper parts, straightening, check the good size, according to the numbering system grouping, packed neatly.
3.4.2 installation card frame, according to the rules and regulations of the design requirements or span installation. Elevator installation, the hanging rod according to the slope to the first order, and wear on the steel bracket, rings according to space position set on the tube, then put tube is raised on bolt screw nut, fixed the pipe. When installed on the bracket of the pipe, the pipe first in place on the bracket, the u-shaped tube installed card in the first quarter, then install the tube in the second quarter, after each section tube according to this, the fastening bolts.
Rule 3.4.3 gas introducing pipe installation: gas introduced tube shall not be laying in the bedroom, bathroom, closed the basement; It is forbidden to laying in flammable, explosive goods warehouse, corrosive medium room and distribution room and substation room, in cable trench, heating ditch, flue and into the duct area, and shall meet the following requirements:
3.4.3.1 introduction of pipe nominal diameter shall not be less than 40 mm. Introducing pipe slope should not be less than 0.003, the slope to the mains. Introducing the tube through the building foundation, should be set in the casing, consider building subsidence, casing should be bigger than introducing pipe number two. Casing size could be selected according to table 1-43, between the casing and the pipe crack in asphalt oil hemp yan, hot asphalt sealing. Introduction of tube wall thickness of 3.5 mm or more seamless steel tubes should be adopted. Away from the building exterior wall within 1 m of underground pipe and casing is not allowed to have a joint, the use of heat bend pipe bending processing.
Wall casing size (mm) table 1-43
Gas pipe nominal diameter DN 25 32 40 to 50 70 15 to 20
Casing pipe nominal diameter DN 32 40 to 50 to 50, 70, 80, 100
3.4.3.2 general admission into pipe in heating ditch, from the ground introduces indoor outdoor, in the tube is 500 mm from high indoor ground pipe using seamless pipe the whole tube against bending, strengthen the anticorrosion layer, wall tube and steel casing. Outdoor pipe roof and wall or into the 3-way plug welding, outdoor pipe bricklaying plaster protection inside and outside, inside filled with expanded perlite insulation, top cover plate.
3.4.3.3 introduced tube if there is no warm air inlet channel or other barriers, by the underground directly into indoor, outdoor pipe using seamless pipe the whole tube heat bending, strengthen the anticorrosion layer, through walls and in the ground and steel casing, inside and outside wall bushing out metope 50 mm. In the ground, casing out of the ground 50 mm, here with the floor is flat.
3.4.3.4 high-rise building of the gas is introduced into tube wear building foundation, the settlement of buildings should be considered, the influence of the inlet pipe should be reserved in the wall hole, the upper press building is the largest settlement shall prevail, retain a certain clearance to enter indoor, on both sides along the pipe build by laying bricks or stones in indoor side closed tube well. Then fill with 4 asphalt asphalt oil hemp wall, plaster plus steel wire net.
3.4.3.5 residential users should as far as possible the introduction of the tube directly into the kitchen, can also be introduced by staircase. The site of the introduction of the public facilities, should try to lead directly to the installation of gas equipment or gas meter room.
3.4.4 installation should be into the door to introduce main pipe or branch road after beginning, to check before loading in the lumen and clean. Head office with good lead wrapped in silk jute or wrapped ptfe packing belt, one at the end of the flat pipe, one tube relatively fixed on the thread on the outlet, slowly turning into the clasp, grabbed a pipe wrench with a former section pipe fittings, turn the tube to a pipe wrench with another moderately elastic, aim at the tag when straightening, request thread is exposed for 2 ~ 3, hemp head in accordance with this method and clear it loaded so far (pipe through the expansion joints or groove, must wear good steel casing).
3.4.5 interior horizontal piping in the corridor outside the stairs or from indoor ground not less than 2.2 mm, is apart from the ceiling is not less than 0.15 m. That the slope of the horizontal tube should be guaranteed to be 0.001 ~ 0.003, the slope to the requirement: slope to the pipeline and burner separately by the gas meter.
3.4.6 indoor gas pipe and other indoor plumbing, the smallest of parallel or intersecting interval of construction equipment shall be in accordance with table l - 44 and given in table 1-45.
Indoor gas pipe and other pipe and equipment between the parallel interval (m) in table 1 to 44
Lighting cable
Ming set have
The distance from 0.1 0.1 1.3 0.1 0.05 0.3
Indoor gas pipe and other cross net distance between pipeline and equipment (m) - 45 in table 1
Other pipeline and equipment to drain the steam pipe Ming fu lighting apply power line electric meter, insurance, and the switch
Distance from 0.01 0.01 0.015 0.15 0.01
When parallel or cross interval can not meet the above requirements, should handle for protection or insulation.
Adjacent buried gas pipe and other pipe, cable, etc. The minimum level, vertical distance are shown in table 1-46-47, table 1 and table l - 48.
3.4.7 indoor pipe wall or floor, should be put in the casing, the casing can not have joint. Wear casing wall should be leveled, with walls on both sides of the length of the floor board casing should be higher than upper floor 30 ~ 50 mm, lower part and the floor level.
3.4.8 pipe fixed Angle steel is commonly used in U word card, its spacing should comply with the provisions of the table 1-49. And each floor of the room
Buried gas pipe and other adjacent pipeline and cable between the minimum horizontal interval (m) in table 1-46
The serial number of project level interval
1 to give 1, drainage pipes
The outer wall of pipeline 1 of 2 and heating tube
3 and 1 power cable
Directly buried
And communication cable laying within the conduit
Buried gas pipe and other between adjacent pipeline and cable, the minimum vertical clearance (mm) - 47 in table 1
Serial number project of vertical interval (when there are casing, casing)
1 to give 150, drainage pipes
2 with the heating pipe of bottom or the top 150
Directly buried 600
With electric cable laying in intraductal 150
Gas pipe and other adjacent pipe and wire, electric meter box, electrical switch the safety distance between (m) - 48 in table 1
category
To and to drain pipe heating and gas
Hot water supply line spacing of gas pipe and electric
Line spacing and gas pipe
Panel distance gas pipe and electric drive
Close the distance and joint
In the same plane acuity 0.05 acuity 0.05 0.3 or 0.15 or higher
Different plane acuity 0.01 acuity 0.02 0.3 or 0.15 or higher
The gas pipe clamp distance (m) - 49 in table 1
Gas pipe diameter (mm) horizontal vertical pipe
DN25 2.0 3.0
DN32 (3.0 ~ 4.0
Gas riser adding at least one fixed clamp, drooping in front of the stove pipe set at least one clip, such as a sagging pipe when the revolving door, can set two clip.
3.4.9 indoor gas pipe valves, acuity DN65, generally USES the gas gate valve; Pipe diameter or less (with blue or tighten the revolving door. Total valve inlet pipe generally installed on the total riser, apart from the ground 1.5 m, stair inlet total riser valve apart from the ground 1.7 m. When the flow rate of 3 m3 / h or less, the table should be set before a revolving door, after table before to burner, not the other valves; When traffic 20 m3 / h or less gas meter, the table set before the valve, can be used as a dining room and other public welfare facilities of the intake valve; When gas consumption 57 m3 / h or less or not interrupt gas users, gas meter bypass valve should be installed, and at the same time adding gas meter outlet valve; From the total main indoor gas to each branch pipe should be installed on a branch of canteen valve; High-rise buildings (more than ten and ten layers of homes and buildings more than 24 m other civil structures) tube introduced in the starting point should be set to cut off the valve, outdoor indoor gas pipe in addition to the installation of a total valve, every six layers in total on the riser should be add a block valve, indoors the finish should be set up emergency cut-off valve; Have more than two segments riser, can be in each vertical pipe set on a valve, if the number of each block valve with more than 30 families, when appropriate, open the valve. Gas taut type installed on the revolving door, revolving door axis should be parallel to the wall; Installing a pressure type revolving gate, only allowed its axis and the vertical metope.
3.4.10 welded steel pipe welding, in which the pick pipe straightening, clean up tube chamber, the pipeline to the installation site, the installation program from the first day. Find is the pipe in place, on the nozzle to obligate mouth direction accurately, after looking for straight with spot welding, pipe diameter of 50 mm or less 2 points, the following welding pipe diameter above 70 mm spot welding at 3 or higher), then in accordance with the requirements for welding welding, after welding should guarantee the pipeline integrity.
3.4.11 pipeline installation, check the coordinates, elevation, pipe diameter changes and reserve the position is correct, then find straight, use level calibration check slope, adjustment qualified after hanging a bolt u-shaped card, make its moderately elastic, right.
3.4.12 straighten or installed pipe wear casing structure, fill the hole wall tube, obligate mouth should add good temporary pipe plug.
3.5 the riser installation:
3.5.1 track of check whether each layer of the reserved hole location is vertical, messenger wire and carved eyes, clip. Preformed pipe in number order can be shipped to installation location.
3.5.2 before installation, first remove the valve cover, a steel casing wear on the tube first, according to the number from the first day to start the installation. Coated lead bound mahjong riser on the interface rotation into the buckle and a tube cone biting fitting, a screw pipe, a pipe wrench screw to moderately elastic, straightening marking requirements, thread exposed 2 ~ 3, obligate mouth a right, and pure hemp head.
3.5.3 check each item to keep mouth elevation and direction of the riser is accurate, such as a right. Will be planted in advance good release pipe clamp, screw down the bolt inside put the tube into the card, with derrick, falling from the first day to find good verticality, centralizer steel casing, finally cooperate with civil engineering in the hole, obligate mouth must add good temporary plug. The riser door installation should be toward to facilitate operation and repair.
3.5.4 gas riser generally equipped inside the kitchen or stairwells. When indoor riser pipe diameter is not more than 50 mm, usually every other floor furnish a union, location is not less than 1.2 m off the ground. In case of valve, must furnish union, behind the location of the union shall be located in valve. A diameter of 50 mm or not set union in the pipeline.
3.6 pipe installation:
3.6.1 check gas meter installation position and riser obligate mouth is accurate. Measure branch pipe size and the size of the lamp fork bending.
3.6.2 branch pipe installation, volume, the size of the branch pipe, and then broken tube, wire, heat lamp fork bending and straightening. Will light the fork or short tube bending two lead to tie up linen, pack good oil, gas meter, and pure hemp head.
3.6.3 sank proofreading branch pipe line steel, spirit level, slope of the peace wall spacing size, a total review of the riser and gas meter for mobile, qualified after substituting branch under the gas meter. System according to the rules and regulations of design or the pressure test and purging, purge qualified after remove the connecting pipe before commissioning, installation of gas meter. After passing the acceptance formalities.
3.7 gas meter installation:
3.7.1 resident households should be put in a gas meter: collective, business, business users, each independent accounting units at least should be put in a table.
3.7.2 gas meter before installation must meet the following conditions:
3.7.2.1 gas meter factory certification, manufacturers have the production license, the table by the statutory inspection unit;
3.7.2.2 manufacture date no more than four months away, such as more than, is subject to statutory inspection unit;
3.7.2.3 without any obvious damage.
No collision in the process of gas meter installation, inversion, rap, there is no rust, debris, oil and other fall into the instrument.
Table 3.7.3 skin membrane installation must be a right, bottom should be supported. Gas meter with the surrounding facilities of level interval as shown in table 1 to 50.
Gas meter with the surrounding facilities level net (m) table 1 to 50
Facilities list low-voltage family dining room to kitchen oven boiled water metal chimney brick oven
Horizontal distance of 1.0 0.3 0.7 1.5 0.6 0.7
3.7.4 the skin membrane table, installation should follow the following provisions:
3.7.4.1 skin membrane table installation height can be divided into:
High table installation: the bottom of the table from the height not less than 1.8 m;
A table in the installation: the bottom of the table from the height not less than 1.4 ~ 1.4 m;
Low table installation: the bottom of the table from the net height should not be less than 0.15 m.
3.7.4.2 install skin membrane in the aisle table must be installed according to the high table; Indoor skin membrane table is given priority to with a table in the installation, low table is complementary.
3.7.4.3 skin membrane table on the back of the net from the wall from 10 to 50 mm.
3.7.4.4 multiple skin membrane table installed on the wall, the net distance between table and table not less than 150 mm.
Table 3.7.4.5 installed a skin membrane, generally only install a cock in front of the table.
3.7.5 public building user's gas meter installation points are as follows:
3.7.5.1 installer: introducing the tube and fixed installation, and installation of riser and total valve, to by-pass pipe and gas meters on both sides of the pipe.
3.7.5.2 table dry skin membrane installation method: flow of 20 m3 / h, 34 m3 / h gas meter can be installed on the wall, under the table shapes, such as 40 x 4 Angle bracket. Flow rate is more than 57 m3 / h gas meter can be installed in the brick in the ground, brick machine is 0.1 ~ 0.2 m, should establish the by-pass pipe. Table on both sides of the piping and by-pass pipe connection for wire, welding may be adopted.
3.7.5.3 roots table (waist drum table) installation method:
Before installation, must wash out table measurement indoor rust-proof oil, its method is to use gasoline from the inlet side of table, pour outlet with containers, repeatedly, until know.
Roots table must be installed vertically, high to low. And filter and the table should be directly connected. Filters and roots dust cover at the ends of the table should not be removed before installation.
Roots table measurement need to correct the pressure and temperature, the pressure and temperature measuring points generally set up before the instrument.
Installed, check first ventilation pipes, valves, meters and other installation parts with and without leakage phenomenon, after confirm all good seal, oil plug on the twist in the table below, again add lubricating oil (oil cannot be more than the market regulation scribed line on the specified window) tighten the screw, then slowly open valve, make the table, watch list pointer is uniform smooth running at the same time, if there is no abnormal phenomena can work normally.
3.8 indoor gas pipeline pressure test:
3.8.1 indoor gas pipe should be pressure and tight degree of two kinds of test, the test medium for compressed air or nitrogen.
3.8.2 within residential gas test (test temperature should be at room temperature)
3.8.2.1 test range:
Pressure test for total valve inlet pipe to each focal line section between the revolving door. Do not include gas meter, when testing the applied short pipe to pipe loading forms a tentative unicom. Leak test, in the above range increases all kitchen equipment.
3.8.2.2 pressure test:
Pipeline system on 0.1 MPa, check the weld and tapping with soap and water, no leakage, pressure is not fell sharply at the same time as qualified.
3.8.2.3 closely degree of test:
Within the piping system does not install gas meter, down to 700 mm water column, observed for 10 minutes, pressure drop is less than 20 mm water column for qualified; Within the piping system is equipped with gas meter, down to 300 mm water column, watch for 5 minutes, the pressure drop is less than 20 mm water column is qualified.
3.8.3 dining room, boiler room of the gas test:
3.8.3.1 test range:
From the inlet pipe total door to focal (boiler burner) before the revolving door between the pipes.
3.8.3.2 pressure test:
Low pressure pipe test pressure is 0.1 MPa, medium pressure pipe test pressure is 0.15 MPa, check with soap and water interface, no leakage, test pressure nor fell sharply at the same time, it is qualified.
3.8.3.3 closely degree of test:
Low pressure test pressure pipeline system for 1000 mm water column to observe for an hour, such as pressure drop less than 60 mm water column is qualified. Medium pressure pipe test pressure of 1.5 times the working pressure, but not less than 0.1 MPa pressure table, after filling test should be in the pipeline for 3 h to observation, such as the pressure drop is less than 1.5%, an hour is qualified.
3.8.3.4 tight gas meter test:
Test shall be carried out after the pipe closely degree qualified, testing pressure is 300 mm water column, observe 5 mm, less than 20 mm water column pressure drop for qualified.
3.8.4 liquefied petroleum gas pipeline test:
3.8.4.1 test range:
Full system by a pressure reducer export revolving door, pressure reducer, gas collector side for the high pressure section, on the other side to low voltage.
3.8.4.2 withstand voltage test.
Do withstand voltage test, high pressure section in the closing good export pressure reducer, the revolving door made up to 1 mpa, check all the interface with soap and water, no leakage for qualified.
3.8.4.3 closely degree of test:
After test pressure to 700 mm water column, watch the 10 min, pressure drop is less than 20 mm water column is qualified.
3.9 pipe purging: purging should be performed without gas meter, pipeline is in after the test can do purge, compressed air or nitrogen purge application for continuous, shall ensure that there is plenty of traffic. Blow the acceptance formalities after washing clean.
3.10 pipe derusting and anti-corrosion:
3.10.1 outdoor pipeline anticorrosion treatment:
According to the location of pipe laying soil corrosion degree of the pipes; The use of the pipeline importance and choose different insulating layer. In pipeline crossing the stray current region, should take measures to ensure the good use of. Commonly used asphalt anticorrosive coating, and its structure are shown in table 1-51, material consumption are shown in table 1 to 52 into strengthening anticorrosion and strengthen. General soil using strengthening anticorrosion. Under the condition of the soil corrosion is higher, or for crossing the river, the major roads, a top tube and casing or crossing the channel of gas pipeline in strengthening anticorrosion.
Asphalt coating level and structure of table 1-51
Each layer of asphalt thickness of the glass cloth
Total thickness (mm)
(mm)
Strengthen the anticorrosion primer - tar - glass cloth - - glass cloth - tar -
1.5 - tar - glass cloth covering material is six
, strengthen the anticorrosion primer - tar - glass cloth - - glass cloth - tar -
Glass cloth, asphalt, glass cloth, asphalt, covering material material 1.5 9
Outdoor pipeline oil bitumen coating construction requirements are as follows:
3.10.1.1 derusting, must remove the rust and other impurities, then clean the surface, with metal color.
3.10.1.2 primer: after cleaning the surface of the pipe should be dry, clean, can besmear to brush paint, primer coating should be smooth, no bubbles, clots, flow mark, defects such as blank.
3.10.1.3 melting bitumen: clean water, do not contain impurities, three indicators (penetration, ductility, softening point). Boil asphalt temperature at 200 ℃ or so commonly, highest do not exceed 240 ℃.
Dry rear can pour 3.10.1.4 casting bitumen coating: primer with asphalt.
3.10.1.5 bandage glass cloth: when bandaging, must use the dry glass cloth. Glass cloth edge for 10 ~ 15 mm, the lap length is 50 ~ 80 mm. Glass cloth penetration rate shall be 95% above, forbidden area of more than 50 mm x 50 mm
In the blank.
3.10.1.6 covering: the bandage should be closely moderate, no wrinkle, the phenomenon such as shell, pressure evenly.
3.10.1.7 coating quality inspection:
Per meter pipeline anticorrosion materials with scale table 1 to 52
Tube diameter DN40 (DN80 DN100 6 DN200 DN250 12 DN350 DN400 DN450
4 # asphalt (kg) 1.50 1.86 2.81 3.35 4.85 5.74 7.13 4.85 9.76 11.05 12.34
Kaolin (or talcum powder) (kg) 0.25 0.32 0.48 0.57 0.83 0.97 1.12 0.83 1.65 1.87 2.09
Glass cloth (m2) 0.23 0.29 0.43 0.57 0.68 0.88 1.14 0.68 1.57 1.77 1.98
Gas (kg) 0.128 0.155 0.230 0.128 0.375 0.485 0.624 0.155 0.862 0.974 1.080
4 # asphalt (kg) 2.34 2.76 4.11 5.12 7.44 8.80 10.92 7.44 14.96 16.82 18.83
Kaolin (or talcum powder) (kg) 0.40 0.47 0.71 0.86 1.25 1.48 1.84 1.25 2.51 2.82 3.15
Glass cloth (m2) 0.48 0.61 0.89 1.07 1.38 1.78 2.30 1.38 3.16 3.56 3.98
Gas (kg) 0.244 0.303 0.441 0.244 0.697 0.899 1.16 0.303 1.590 1.800 2.000
Note: (1) asphalt emperor grease formula for: room temperature, 4 # asphalt: kaolin (or talcum powder) = 85, 15 (weight ratio)
(2) cold priming oil formula is: 4 # asphalt: gasoline (volume ratio) = 1:3.
Chase a appearance: use visual check step by step a root, surface should be smooth, no bubbles, pits, wrinkles, tumors and other defects.
B: the thickness according to the design requirements, the total thickness should comply with the provisions of the table 1-28.
Check, every 20 a selectiving examination, each measuring three section, each section should be measure up, down, left, right four points, and will be subject to the thinnest points. If not qualified, two selectiving examination again. When one of them is still not qualified, are all not qualified.
C bond: anticorrosive coating on a cutting Angle is 45 ° ~ 60 ° incision, from the Angle of cutting edge tearing area of 30 ~ 50 cm2, not easy to tear and rip after adhesion on the surface of the steel tube, the first layer of asphalt accounted for 100% of the area of the tear is qualified.
According to the above methods every 20 spot check the other, each measuring point, if not qualified, then two selectiving examination, one of them is not qualified, are all not qualified.
D coating insulation: electricity spark leak detector for testing, not dozen spark as qualified, the minimum leakage voltage according to the following formula:
U = 7840
Type in the U - leakage voltage (V);
Delta - coating thickness (arithmetic mean of the measured number) (mm).
(a) every 20 root a selectiving examination, measured from the pipe end to the other end, if not qualified, smoking a root again, one of the root is unqualified, is all not qualified.
(b) prior to backfill soil, the construction is put good anticorrosion coating pipeline check again, from the pipe head end to end, found that the strike, must be repaired.
E repaired mouth, patching, repairing, patching anticorrosive coating structure and materials used shall be the same as the original pipeline anticorrosion coating. Repairing, each layer of glass cloth should be the original pipe end asphalt coating tower after summer-planting place more than 50 mm long; Fill quickly for damage surface diameter greater than 100 mm above, should according to the corrosion layer structure of patching, less than 100 mm, asphalt repair available.
F for asphalt anticorrosive coating insulation pipe, backfill soil after have to use a coating anticorrosive layer leak detector leak detection, found to damage the wound, must repair the qualified.
G to the above-mentioned quality standard, must list record, and save for future reference.
3.10.2 indoor gas pipe and accessories brush ZhangDan derusting processed oil, silver or gray paint two way.
3.11 residents with kitchen installation:
3.11.1 residents life gas should be used in low pressure gas. Low-pressure burner pressure rated as: gas 2 kpa. The artificial coal gas 1 kpa.
3.11.2 install gas cookers room should satisfy the following conditions:
3.11.2.1 should not be installed in the bedroom, indoor underground. If use the bedroom apartment when the kitchen, should be separated by a door. Kitchen should have natural ventilation and natural lighting, there is a direct pass outside the doors and Windows or vents, room height not less than 2.2 m.
3.11.2.2 refractory is not lower than second class, when not meet this standard, can be in the kitchen on both sides of 800 mm and 100 mm below range, labeled with incombustible materials.
3.11.3 within the newly built residential kitchen allows the volume of heat load index, general take 580 w/m3.
3.11.4 civilian kitchen to provide installation, should satisfy the following conditions:
3.11.4.1 ovens should be placed on the refractory, hearth height is 650 mm.
3.11.4.2 when grafted between kitchen and table, the connection of the pipe diameter should not less than DN15mm, and should be equipped with a union.
3.11.4.3 ovens such as soft connection, the connection hose length is not more than 2 m, soft hose and the corrugated pipe joint, clamp fixed between the hose inside diameter should not be less than 8 mm, should not wear a wall.
3.11.4.4 public when several ovens and installed inside the kitchen, the net distance between oven and stove should be not less than 500 mm.
3.11.4.5 install where there is enough light, but should avoid drafts direct ovens.
3.12 public building user kitchen installation:
3.12.1 kitchen structure classification:
Assorted kitchen provides 3.12.1.1 steel structure, such as Shanghai gas meter factory production of kitchen for a while, mesa of iron plate, pipe type oven steamed rice cooker, fire tube type steamed rice cooker, iron rice cooker; Three-eyed oven gas appliance factory production, six eye focal pancakes, boiling furnace, furnace, etc., most of this kind of kitchen is provided by the manufacturer will stove body and burner as a whole, when installation should be according to the designed position field in place, the piping can..
3.12.1.2 mixed structure of kitchen is provided, such as large western kitchen, shell is steel or stainless steel and cast iron finished products structure, internal lining brick, according to design requirements of the oven and heat insulation heat preservation facilities, burners and piping installation.
3.12.1.3 brick oven: mainly include boiler (big cookstoves), high stove (cooking stove), the stove body should be the scene of this kind of stove masonry, then according to the need to make different specifications of the burner.
3.12.2 before burner piping:
3.12.2.1 high in front of the stove burner piping as shown in figure 1-53, if choose 8 tube (exergy), 13 tube (
Main exergy) of the riser burner, these two kinds of burner is single inlet pipe, and 15 mm diameter respectively into DN, DN20mm thread connection.
The union, when installation should be in to the outer edge of the burner into ZaoKou, clamp valve between the union and should be planted, before the stove pipe in high stove oven along the bottom.
3.12.2.2 boiler burner piping as shown in figure l - 54, if choose 18 pipe, 24 burner head inside and outside the circle is separated, double inlet pipe, the diameter is DN20mm threaded connections. Each valve control switch, its connection form as shown in figure 1-54 (a).
30 pipe, 33 riser burner for single inlet pipe diameter for DN25mm threaded connection, the connection as shown in figure 1-54 (b). The burner switch for the interlocker plug, respectively control the burner and pilot burner fire. Burner piping diameter for DN25mm, small fire DN10mm pipe diameter, and lead to the burner head, and ask the small fire in the hole above the burner riser fire hole 1 ~ 2 cm, when used to open the pilot switch, fire lit pilot fire, the fire and open interlock cock switch, automatic ignition burner.
3.12.3 riser burner installation requirements:
3.12.3.1 burner head center should be with up and down the center of the pot, the error is generally not more than 1 cm, in order to make sure not to burn pot.
3.12.3.2 burner head should keep level, in order to guarantee the vertical flame combustion.
3.12.3.3 control burner in the hole surface of depth from the bottom of the pot. In the Beijing area high riser of the oven burner general distance from bottom of the pot for 13 ~ 14 cm; The steamer this distance is commonly 17 ~ 19 cm. The total should have contact with outer flame of fire pot is advisable.
3.12 4 burner installation considerations:
3.12.4.1 burner material such as cast iron, pipe thread should conform to the requirements, the pipe when the strength should be uniform, in order to prevent the intake pipe crack.
3.12.4.2 burner is generally selected before the cock taut plug, when installation should be parallel to the direction of the axis of the cock and the oven body surface, is advantageous for the elastic tail nut, and maintenance.
3.12.4.3 because this kind of burner itself before the intake pipe without valve, and on the stove burner piping before a final control cock, cock is pipeline system to cock to burner section and the thread cannot test examination, only behind the combustion air can check leakage, therefore this period of the especially when installation should pay attention to the installation quality, in order to prevent the accident after aeration.
3.12.5 ovens for smoke evacuation requirements:
3.12 5.1 with the exhaust mouth gas cookers, appropriate USES separate tunnels, buildings when multiple devices share a vertical flue, in order to prevent the smoke interference, should every other floor after a appliance; Appliance to horizontal flue, should be set up in the flue gas flow direction guide.
3.12.5.2 connect the gas stove of exhaust pipe design and installation requirements are as follows:
A row of the diameter of the pipe should be calculated, minimum shall not be less than the diameter of the gas cooker exhaust port;
B exhaust pipe shall not be through the bedroom;
C installation is lower than 0 ℃ room should make metal exhaust pipe heat preservation;
D utensils on the exhaust pipe shall be not less than 0.5 m vertical flue, can connect to the horizontal flue;
E level discharges flue pipe section should be not less than l % of the slope, slope to gas cookers, generally no more than 3 m in length, as proved by computing draught reliable, length of horizontal flue to greater than 3 m;
F exhaust pipe with flame retardant clear distance of metope should be not less than 10 cm, with plaster ceiling of interval is not less than 25 cm, exhaust pipe in the combustible and through the roof, should be in accordance with the requirements of fire properly handle;
G the export of exhaust pipe should be setting up hood.
3.12.5.3 brick flue technology main points:
A new build by laying bricks or stones flue must go through calculation, the old flue passes through accounting.
B flue should tightly solid, the lining is smooth;
C flue should have enough suction force, to ensure that the combustion chamber vacuum degree is not less than 5 pa mmH2O (0.5);
D build by laying bricks or stones inside the walls of the flue, can not have the level part, that can hold a necessary and horizontal line into at least 60 ° Angle of inclined flue, two vertical flue centerline distance shall not be greater than 2 m;
E from the furnace to each individual level of total flue flue, should be separated from each other at the entrance to the total flue, so as to avoid each other up gas, affect the draught.
3.12.5.4 flue roof above 1.0 m above, when installing the flue for ridge house, should be handled according to the height of the chimney progress.
3.12.5.5 if there is a higher buildings near the flue and affects a smoke, can consider to use mechanical smoke exhaust measures.
3.12.5.6 exhaust pipe is greater than 125 mm in diameter, when the length of horizontal flue big 13 m or the accumulation on the flue gas area, should be set break point.
3.13 the water heater installation. Should not be directly installed in the bathroom, water heater can be installed in the kitchen or other room, can also be installed in a well-ventilated aisle, but should not be installed outdoors.
3.13.1 to install water heater room shall meet the following requirements:
3.13.1.1 room height should be greater than 2.5 m.
3.13.1.2 volume of the room shall comply with the requirements of article 3.11 3.11.3.
3.13.1.3 water heater exhaust smoke shall meet the following requirements:
A direct exhaust type water heater installation room wall or window should be the top of the vent, as shown in figure l - 55;
B installation flue exhaust type water heater in the room should have the flue, as shown in figure 1-56.
C balance type water heater room outside wall installation, should be into the vent interface, figure 1-57.
3.13.1.4 room door or the bottom of the wall should be reserved to the area of not less than 0.2 m2 shutters, or between the ground and left the door height not less than 30 mm gap.
3.13.2 exhaust type water heater it is forbidden to install directly inside the bathroom, the flue exhaust type and balance type water heater can be installed in the bathroom. Install the flue exhaust type water heater must meet the following requirements:
3.13.2.1 bathroom volume should be greater than 7.5 m2;
3.13.2.2 the flue, exhaust pipe interface of the bathroom and the door shall comply with article 3.13 3.13.1 3.13.1.3, 3.13.1.4 requirements.
3.13.3 water heater installation location shall meet the following requirements:
3.13.3.1 water heater mainly in operation and maintenance convenience, not easy to be the part of the collision, the water heater in front of the space width should be greater than 0.8 m.
3.13.3.2 installation height of the water heater to the concept of fire water heater hole with the eye height qi advisable, generally from the ground 1.5 m.
3.13.3.3 water heater should be installed on the wall of the refractory, the net distance of water heater from the wall shall not be less than 20 mm, if the installation on the wall of the non refractory should pad to insulation board, insulation board should be bigger than water heater size 100 mm per side.
3.13.3.4 of gas water heater, water supply pipeline appropriate USES metal pipe, hose connection may be adopted. When using a hose connection, the gas pipe should use resistance tubing, conduit pressure pipe should be adopted. The hose length shall not be more than 2 m. Hose and clamp fixed joint application.
3.13.3.5 direct exhaust type water heater exhaust port and room ceiling distance shall not be less than 600 mm.
3.13.3.6 water heater and gas meter, the level of the gas range interval is not less than 300 mm.
3.13.3.7 upper water heater can not have electric power lines, electric equipment and combustible materials, water heater and electrical equipment level interval should be greater than 300 mm.
3.13.4 flue type water heater natural smoke exhaust device shall meet the following requirements:
3.13.4.1 in civil buildings, the installation of water heater shall have a separate room flue, when set separately flue with difficulty, also can set Shared flue, but exhaust ability and draught shall meet the requirements.
3.13.4.2 exhaust, the upper part of the safety of the water heater shall be not less than 0.25 m of vertical flue gas duct, pipe diameter shall not be less than the diameter of the water heater exhaust port.
3.13.4.3 flue should have enough suction and exhaust ability; Safe water heater exhaust outlet suction (vacuum) shall not be less than 3 pa mmH2O (0.3).
3.13.4.4 water heater shall not be used on the flue of the damper.
3.13.4.5 that the slope of the horizontal flue due to water heater at the slope of 1%. Horizontal flue length shall not be more than 3 m.
3.13.4.6 chimney outlet temperature of exhaust, shall not be lower than the dew point temperature.
3.13.4.7 chimney exports should set the cowl, its height should be higher than that of the structure of the positive pressure region.
Above the roof 0.5 m 3.13.4.8 chimney exports and should prevent rain and snow into the well.
4 quality standards
4.1 ensure projects:
4.4.1 pipeline leak test results and the compression strength of and tubing, type, specification must comply with the design requirements of the appliance.
Test method: all inspection. Check system or partitions (period) test record and certificate of quality and product certification.
4.1.2 slope of the pipeline must comply with the design requirements.
Testing method: according to the system every 30 m 2 selectiving examination period, straight section length less than 30 m not less than 1; Dividing walls of buildings, to partition is section number, spot check 5%. But not less than 5 segments. Quantity check or check with level, stay and ruler measurement record.
4.1.3 pipeline and pipe sit (pier) laid on permafrost and untreated scarification is forbidden.
Test method: all inspection. Observe or check the concealed work record. )
4.1.4 gas is introduced into tube and indoor gas pipe and other various types of pipeline, power cables, wires and electrical switch, the minimum horizontal, vertical and cross the net, must comply with the design requirements or table l - 53 ~ - 55 rules in table 1.
Buried gas pipe and other adjacent pipeline and cable between the minimum level of net from table 1-53
The serial number of project level interval (mm)
1 to give, and drain
2 the outer wall of pipeline and heating tube
3 and power cable is 1000
Directly buried
Inside the tube
Buried gas pipe and other adjacent pipeline and cable net minimum vertical distance between the table 1-54
Serial number project of vertical interval (when there are casing, casing) (mm)
1 and to drain, 150
2 with the heating pipe of bottom or the top 150
Directly buried 600
150 in the ducts
Gas pipe and adjacent wires and pipes, the distance between the meter box, electrical switch connector table 1-55
category
To give, drainage, heating and gas pipe
Hot water supply line spacing (mm) gas pipe and wire
The spacing distribution box (mm) and gas pipe,
Plate distance (mm) and electrical switches and gas pipe
Joint distance (mm)
The same level or a 50 to 50 or more
Different plane 10 or 20 or more
Inspection method: all inspection. Observation and feet quantity check. If no design requirements, must conform to the provisions on the following three tables.
4.2 the basic items:
2 galvanized carbon steel pipe and galvanized carbon steel pipe connections, for carbon steel pipe thread machining accuracy accords with national standard "pipe thread" regulation, thread clean and neat, no broken wire or wire, firm connection, pipe thread root has exposed, galvanized carbon steel pipe joint, no broken wires thread. Galvanized carbon steel pipe and pipe fittings galvanized layer without damage, thread showing a good corrosion resistance, interface exposed linen top defects.
4.2.2 carbon steel pipe flange connection should be parallel to the docking, close together, with the center line of the vertical pipe. Screw with nut length is consistent, and not more than half the diameter of the screw, nut on the same side, liner material conform to the requirements of the design and construction rules.
Holdings of galvanized carbon steel pipe welding joint straight, uniform weld waves, weld surface without nodules, slag inclusion and porosity. Weld strengthen face conform to the rules and regulations of construction.
4.2.4 pipe (,) and tube (block) of the installation should be constructed, correct embedding those strong, neat rows. Close contact with pipes.
4.2.5 valve installation: type, specification, pressure and leak test in accordance with the design requirements. Location, import and export in the right direction, firm connection, close, flexible for opening and closing, towards reasonable, surface clean.
4.2.6 installed inside a wall and floor of the casing requirement: floor inside the casing, the top above the ground of not less than 20 mm, the bottom and ceiling surface flush, and facing flat on both ends of the wall inside the casing, fixed firmly, flush nozzle, girth.
4.2.7 buried pipeline coating material and structure comply with design requirements and construction specifications, coil and pipe and stickup and firm, between each layer coil surface level off, without buckling, empty drum, defects such as sliding and sealing is lax.
4.2.8 piping and the types of the paint and metal stents coating times comply with the design requirements, good adhesion, without peeling, blister and the coating, the film thickness uniformity, colour and lustre is consistent, no flow and pollution phenomenon.
4.3 allowable deviation (table l - 56) of the project:
5 finished product protection
5.1 installed pipe shall not be used as support or scaffold board, shall not tread, the topkapi wearing not as a stress point for other USES.
5.2 interrupt construction, pipe must be temporarily closed.
5.3 pipe before spray to protect, prevent pollution of mortar pipes.
5.4 door of the handwheel when installation should be unloaded, before the completion of unified installation intact.
5.5 gas meter should have protective measures, to prevent damage, can be unified installed before commissioning.
5.6 have decorate the room, if you need to use gas welding, of metope, ground used iron block, to prevent pollution.
6 should pay attention to quality problems
6.1 pipe damage of galvanized layer. Due to the pressure and disrepair, tongs, long card pipes.
6.2 riser jilt highly inaccurate, due to the high exceed the allowable deviation or inaccurate measurement; Riser is apart from wall inconsistent or half bright and half dark, due to improper riser position arrangement, or partition wall displacement deviation caused by too much; The riser is not vertical, mainly carved plate hole, no messenger wire or plug hole squeezed position and cause. Corresponding measures should be aimed at these reasons.
6.3 casing out of the ground height of the riser is not enough, or fall under the roof or in the sleeve seam filler. This is mainly due to the plugging hole not cooperate well, check is lax or civil ground elevation, plaster is too thick to cause. Should strengthen the inspection, do well the cooperation.
6.4 support installation and firm, not use nail, destroy the civil decoration. This is due to the construction decoration completed before mounting bracket and pipeline, should avoid this kind of circumstance happening, do good cooperate with construction progress, support pipe installation should be completed before the decoration engineering construction, and banning the use of nail as fixed bracket, gas pipeline and equipment application planted wall pipe clamp is fixed.
Explosion indoor gas pipe installation and verify the allowable deviation method table 1-56
Will project allow deviation (mm) test method
1 take 10 use level, ruler,
2 the plus or minus ten arrows and feet high quantity check
Pipe diameter less than or equal to 100 mm (0.5)
Horizontal and longitudinal diameter greater than 100 mm 1 level, ruler,
Transverse direction of bending the pipe diameter less than or equal to 100 mm is not more than 13 arrows and quantity check
(more than 25 m) is not greater than 25
2 per 1 m
Total length of more than (5 m) is not more than 10
5 into the pipe valve valve center + 15 off the ground
At the bottom of the table plus or minus 15 feet off the ground check
6 gas meter table 5 from behind the wall surface
The center line of the vertical degree 1 quantity check messenger wire and ruler
15 feet away from surface of furnace + 7 gas mouth quantity check
+ 0.1 the delta
0.05 the delta with steel needle pierced
Insulation inspection
Coil or sheet 5 in 2 m by feet and
Spray coating, or other 10 wedge feeler check
Note: the delta pipe insulation layer thickness.
6.5 ma head cleaning not net, the reason is that operators is not clear in time.
6.6 gas such as without sulfur treatment, gas pipeline valve used iron shell core. Such as gas desulfurization process, also can use copper valve sealing ring.
7 should possess the quality of the record
7.1 the certificate of approval of materials and equipment; Send the test report and the construction of legal detection unit unit at the scene inspection records.
7.2 the pipe and equipment engineering records.
7.3 of pipeline and equipment inspection records.
7.4 piping and equipment of the individual and system strength test records.
7.5 piping and equipment strength of individual and system leak test record.
7.6 pipe purging records.
7.7 anticorrosion coating quality inspection records.
7.8 by building or construction unit to gas company apply for completion inspection and acceptance, gas company, in conjunction with the design, and other relevant units to test for the completion inspection and acceptance records.
8 according to the standard
8.1 the city gas pipeline engineering construction and acceptance standard "(CJJ33-89).
8.2 the household gas hot water fast installation acceptance procedures (CJJ12-86).
8.3 specification for design of city gas (TJ28-78) (trial).
8.4 the building heating health and gas engineering quality inspection evaluation standard "(GBJ302-88)
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