Installation technology for indoor water supply pipeline

1 scope

The standard is suitable for civil and industrial building water supply pipes (including water supply hot and cold water pipes of cast iron pipes and galvanized carbon steel pipe) the installation works.

2 construction preparation

2.1 materials request

2.1.1 specification of cast iron pipes and fittings shall conform to the design pressure requirements, uniform tube wall thickness, smooth and clean inside and outside, without sand holes, cracks, burrs and knots; spigot diameter and pipe fittings should be a regular shape, it tube uniform inner and outer anticorrosion coating on the surface should be clean, firm. Pipes and fittings shall have the factory certificate.

2.1.2 specifications of galvanized carbon steel pipe and fittings shall conform to the design requirements, the wall inside and outside galvanized uniform, no rust, no fin. Fittings not offset clasp, clasp, angle so that threads are not allowed, and so on. Pipes and fittings shall have the factory certificate.

2.1.3 water meter specifications should comply with the design requirements and the water company to confirm, hot water system hot water table meets the temperature requirements. Case casting rules, trachoma, crack-free, watch glass cover for damage, seals intact, factory certificate.

2.1.4 specification shall conform to the design requirements of the valve, valve hot water systems meet the temperature requirements. Valve body casting rules, smooth surface, crack-free, flexible switching and shut tightly, packing seals intact without leakage, hand wheel complete without damage, factory certificate.

2.2 the main tools:

2.2.1 mechanical: pipe threader, wheel saws, drill, hammer, hand drill, welding machines, electric pressure test pump and so on.

2.2.2 tools: Threading plate, pipe wrenches, pressure pliers, hand saw, hammer, adjustable wrench, chain pliers, simmering bending machine, hand pumps, screw driver, hammer, broken pipe, etc.

2.2.3 other: spirit level, wire, steel tape, small line, pressure gauge, etc.

2.3 operating conditions:

2.3.1 underground piping must be at the House soil backfill tamping or dig to the bottom elevation along the pipeline location clean pipe through the wall pipe hole or installing casing, the hole size and the sleeve specifications, coordinate, height is correct.

2.3.2 embedded pipe in the trench is not gaigou cover or ceiling is not installed before the closure, the steel bracket should be installed and meets the requirements.

2.3.3 wall mounted support, suspended pipe installation must be installed upon completion of the roof. Along the pipeline installation location of the template and clean up the debris, thanks to elevators have been installed firmly and correctly positioned.

2.3.4 standpipe installation should be carried out after the completion of the main structure. After reaching the installation conditions of high-rise buildings in the main structure, proper insertion. Each floor should have clear elevations, concealed the shaft pipe vertical templates and other debris should be cleared, and fall protection measures.

2.3.5 branch pipes should be installed in the wall is completed, prior to the decorated wall (including concealed pipes).

3 operational processes

3.1 process:

Installation preparation – perform the installation standpipe installation → → → dry tube tube installation →

Pipeline corrosion protection and insulation – pipe flushing

3.2 installation preparation: earnestly familiarity with drawing paper, according to the decision of construction scheme of construction methods and technology to give the low-down the specific measures to step up preparations. Refer to the appropriate professional equipment and the renovation of building plans, check the coordinates, elevation is a crossover of various pipe, pipe arrangement using space is reasonable. Solve problems and design and associated personnel, good changing record of negotiation.

3.3 prefabricated processing: by design drawings painting out pipeline tap, and tube diameter, and variable diameter, and reserved tube mouth, valve location, construction sketches, in actual installation of structure location do Shang mark, by Mark segment volume out actual installation of accurate size, records in construction sketches Shang, then by sketches measuring have of size prefabricated processing (broken tube, and sets silk, and Shang parts, and adjustable straight, and proofing, by pipe group number (process see l-1).

3.4 dry-pipe installation:

3.4.1 water supply cast iron pipe installation:

3.4.1.1 in the pipes before installation clean the pipe bore, socket socket outside on the inside end of the pitch, and socket order toward the water, joins counterparts clearance shall be not less than 3mm. After leveling, and fixed the pipe. Pipe bend at the beginning and should support, and prevents twisting when axial movement, all tube sealing the well at any time.

3.4.1.2 twist Ma Shi first clear bearing mouth within of dirt real, will oil rope twist into twist-like, with Ma soldering twist into bearing mouth within, General twist two circle above, about for bearing mouth depth of one-third, makes bearing mouth around clearance keep uniform, will oil Ma twist real Hou for twist gray, cement with No. 325, above added water mix uniform (w/c for 1:9), with twist chisel will gray fill into bearing mouth, with fill with pound, fill Hou with hammer playing real, until will bearing mouth playing full, gray mouth surface has gloss. Socket should twist after the maintenance, covered with moist soil or entangled in rope and other objects interface, timed water conservation, General 2-5 days. Winter anti-freezing measures should be taken.

3.4.1.3 used green lead interface of water cast iron tube in bearing mouth oil Ma playing real Hou, with stereotypes card hoop or package has clay of rope close bearing mouth, gap with clay wipe strict, with of aluminum pot heating lead ingots to 500 ℃ around (liquid surface purple color), level tube irrigation lead mouth is located in above, will melt lead slow irrigation into bearing mouth within, makes air discharge. For large diameter pipes lead the rate may be appropriate to speed up, to prevent solidification of molten lead midway. Each aluminum should be time filled, immediately remove clamp or slime mould after solidification, hit solid with a screw driver will lead (lead-lead connector or twist).

3.4.1.4 water supply cast iron and galvanized steel pipe connections should be installed in the figure 1-5 in several ways.

3.4.2 water supply galvanized pipe installation: install total entrance generally starts when the operation, total imports end plus a good temporary plug for pressure testing, design when bitumen coating or to enhance the corrosion is required, after the prefabricated, installed before the corrosion. Up the pipeline to install prefabricated parts by number order line. Before installation clean the pipe bore, thread connect the oil pipeline on lead wrapped hemp, then tighten with a pipe wrench by number, such as exposed 2-3 buckle, straight after the initial installation attempt to find and review left the position, orientation, and size are correct. Clear heads, all want good temporary plug nozzle.

3.4.3 wall according to the design requirements for hot water pipes and casing and fixing bracket, installing compensator on the required pretension until after the installation of pipe fixing clamp, remove prestressed supporting structure, adjust the slope, stand up high to let in fresh air, low drain devices.

3.4.4 water supply pipe diameter pipe when the use of galvanized carbon steel pipe, welding flanges should be used, pipes and flanges according to selection pressure welded or seamless steel tube, pipe installing the first hydraulic pressure test, leakage-free number, and then open the galvanized flange processing. Processing shall not be painted and galvanized pipe pollution, pipe galvanized by number two after install.

3.5 vertical pipe installation:

3.5.1 Li Guan Ming binding: uniform hanging wire installing the card from top to bottom on each floor, stratified by the number of good risers started in order, and mark for good when straightening, threads exposed 2-3 button, clear, reserved check dump height, direction is correct. Exposed screw and damage a good brush for zinc coating antirust paint. Pipe dump with good temporary plug. Standpipe valve installation should be easy to operate and repair. After installation using line hung straight alignment, combined with blocking civil good floor holes.

3.5.2 concealed the standpipe: the card should be installed vertical riser pipe and set the shape measurement, uniform hanging wire installing the card. Wall-mounted within the standpipe should be required in the construction of ducts, riser hang straight alignment after installation, using the card fixed. Pipe Luming and rejection with good temporary plug.

3.5.3 water standpipe: according to the design requirements and the casing. Risers connected to the catheter with 2 elbow (figure l-6). Vertical line length is greater than 15m, use 3 elbow (figure l-7). Riser compensator installation with dry tube.

3.6 branch pipe installation:

3.6.1 support tube Ming loaded: will prefabricated good of support tube from State tube dumped mouth followed by by paragraph for installation, has valve should will valve cover remove again installation, according to pipeline length appropriate added good temporary fixed card, approved different health apparatus of hot and cold water reserved mouth height, and location whether right, and leveling find are Hou planted support tube card pieces, removed temporary fixed card, good morning temporary silk blocking. Tube fitted with water meters on the first connecting pipe, pressure testing in place before after removing the connecting pipe, installation of water meters.

3.6.2 branch concealed: draw a line after you determine the height positioning, removal ducts, prefabricated pipe and tank, leveling is positioned with a hook after nailing. Health apparatus water provision to be done in the open, plus a good plug.

3.6.3 hot water pipe: hot water pipes according to the specification to wall bushings. Hot water pipes should be done above the cold water pipes, branch pipes should be reserved outlet position as Zuo Re right cold. Other installation method and the cold water pipe.

3.7 pipe pressure test: laying, concealed, insulation of water supply pipe in hidden items before hydrostatic testing. Integrated hydraulic test the piping system after the installation is finished. Hydraulic pressure test with air, full water pressure when the pressure rises to the requirements stopped pressured, check connector and valve is leak-free, until a specified time, observe the pressure drops in the allowed range, notice concerned personnel inspection, handing over procedures. Then release the water NET, was broken at the exposed threads of the zinc coating and antiseptic treatment and covert work.

3.8 washing pipes: pipes pressure test can be done after rinsing, rinsing water continuously, should ensure that there is sufficient flow. After washing clean the acceptance formalities.

3.9 pipe anti-corrosion and insulation:

3.9.1 pipeline corrosion: corrosion of water supply pipe laying and installation according to the design requirements and country code for acceptance of construction, all steel brackets and pipe breakage for zinc coating and exposed threads to make up brushes paint.

3.9.2 pipe insulation: thermal insulation of water supply pipes exposed concealed in three forms: pipeline antifreeze thermal insulation, pipe insulation, pipe condensation prevention heat loss insulation. The insulation material and thickness according to the design requirements (as detailed in the 16th), and quality to meet state standards.

4 quality criteria

4.1 project:

4.1.1 plumbing and water system pressure test results must comply with the design requirements and specifications provided.

Inspection method: check the system or partition (above) records.

4.1.2 the piping and pipe support (Tun) laying on the permafrost and untreated soil is strictly prohibited.

Inspection method: concealed works of observation or inspection records.

4.1.3 water supply system after completion or delivery before using, you must purge.

Inspection method: check the purge records.

4.2 Basic project:

Positive and negative deviations of the slope meets the design requirements 4.2.1 pipeline.

Test method using level (level) cable and standard checks or checks hidden project records.

4.2.2 carbon steel pipe precision thread machining in accordance with international provisions of the pipe thread, thread clean neat, no broken or missing wire firmly attached, exposed threads of the pipe thread root, galvanized steel pipe welding, threaded no broken wires. Galvanized zinc coating of carbon steel pipes and fittings without damage, threads exposed part corrosion well, interface is not exposed in Yau Ma Tei and other defects.

Inspection method: observation or check the dissolution.

4.2.3 closely parallel to the carbon steel pipe flange should butt, and perpendicular to the centre line of the pipe. Screw out the nut length, and no greater than the pole diameter one-second, nuts are on the same side, liner materials in line with design and construction specifications.

Inspection method: Visual check.

4.2.4 non-welding of galvanized carbon steel pipe welded joints, straight and uniform welding, weld no nodulation, slag and porosity on the surface. Strengthening compliance with the construction requirements of weld.

Inspection method: observation or using a welding inspection-scale inspection.

4.2.5 socket and confining the interface of metal pipe structure and all packing comply with the design requirements and specifications provided, gray compact full aprons interface straight without distorting, lip clearance is accurate, uniform annular gap, gray cast is flat and smooth, and maintain good, rebound clearance aprons interfaces conforming to specifications.

Inspection method: observation and standard checks.

4.2.6 the pipeline (the crane, occasional) and socket (Tun) installation shall be constructed correctly, laying laying a solid and neat. Support in close contact with a pipe.

Inspection method: observation or by hand to check.

4.2.7 the valve installation: models, specifications, pressure and leak test in accordance with design and construction specifications. Location, import and export right directions, securely connected, close, open and close flexibly, reasonable, clean the surface.

Inspection method: hand inspection and inspection of factory certification, test.

4.2.8 buried pipeline coating material and structural design and construction specifications, coil and paste each coil with a pipe solid and smooth surface, no wrinkles, an empty lax drums, sliding and sealing and other defects.

Inspection method: observation or cut the coating inspection.

4.2.9 pipes, boxes and metal brackets, paint type and brushing a few times to meet design requirements, good, no peeling, blistering and missing coating, coating thickness uniformity, consistent color, flow and pollution-free.

Inspection method: Visual check.

4.3 water supply pipe installation tolerances and inspection methods are given in table l-7.

Tolerance and inspection methods table 1-7

Project tolerance (mm) method

Water cast 1M 1

Horizontal pipe length (25m and above) is not greater than 25

Road vertical and

Transverse direction

Carbon 1M diameter is less than or equal to 100mm

Pipe diameter greater than 100mm 0.5

1 with a horizontal ruler Ruler

Cable and standard checks

Bending

Pipe length

(25m) diameter less than or equal to 100mm

Pipe diameter greater than 100mm less than 13

Not more than 25

Standpipe water supply

Cast iron pipe 1M

Full length (5M) 3

Not more than 15

Vertical carbon

Pipe 1M

Full length (5M) 2

Not more than 10

Surface

Flatness of coil or plate

Plaster or other 4

8 2m m on foot and

Wedge feeler Gage check

Thickness +0.1 δ

-0.05 δ steel needle in septum

5 finished product protection

5.1 installed pipe shall not be used as a support or scaffold shall not be stepping, may not do its Kar points for other purposes.

5.2 pipe in front of a spray to protect, prevent pollution of mortar pipes.

5.3 handwheel should be removed during the installation of the valve, place before a unified installation intact.

5.4 meter shall be protected, to prevent damage, can be unified in place before install.

6 quality problems to be noticed

6.1 pipe galvanized layer is damaged

Reason: because of the pressure and pipe wrenches in dilapidated, card not pipelines.

6.2 pipe dump height is not accurate

Reason: because of high layer out of tolerance or measure accurately.

6.3 pipe from the wall is inconsistent or half bright and dark

Reason: due to the riser where arrangements are inadequate, or partition wall displacement deviation caused by too much.

6.4 hot water standpipe down layers of casing leaks

Reason: because of the casing above the ground sufficiently or plaster was too thick on the ground causing.

Quality of 7 records

7.1 material certificate of factory and site acceptance record.

7.2 water supply, hot water tubing inspection records.

7.3 water supply, hot water pipe inspection records.

7.4 water supply, hot water pipe inspection records.

7.5 water supply, hot water piping pressure test of single records.

7.6 water supply, hot water pipes hidden records.

7.7 water supply, hot water system pressure test records.

7.8 water supply, hot water systems flush records.

7.9 water supply, hot water system water records.

7.10 hot water system debug logging.