1 scope
The technology standard is applicable to civil and general industrial building steam pressure conduit is not greater than 0.8 MPa and accessory device installation.
2 construction preparation
2.1 material equipment requirements:
2.1.1 pipe material: carbon steel pipe, seamless steel pipe, pipe shall not be bent, rust, not fly, double skin and uneven phenomenon.
2.1.2 pipe fittings: unbiased buckle, square buckle, buckle, defects such as broken wires and Angle is not standard.
2.1.3 valve: casting rules, no burr, crack, flexible switch, thread without damage, straight and right Angle, strength meet the requirements, the handwheel without damage.
2.1.4 accessory device, pressure reducer, hydrophobic, filters, compensator, such as when should comply with the requirement, and the factory quality certificate and instruction manual.
2.1.5 other materials: steel, round steel, pipe clamp, bolts, nuts, gasket, such as electric welding rod choose accord with a standard to ask.
2.2 the main equipment:
2.2.1 equipment: wheel saws, cover silk, machine, electric hammer bench drill, electric welding machine, heat bending, jack.
2.2.2 tools: tongs, the pressure case, vise, welding tools, hand saw, hammer, active board, chain.
2.2.3: other level, chisel, steel tape, sank, string cable line.
2.3 operation conditions:
2.3.1 located within the gutter main installation, should the gutter is cleaned, installed elevator frame, before cover trench cover installation.
2.3.2 overhead the main installation, should be managed in the bracket after fixation, take a good scaffold for installation.
3 operation process
3.1 process:
Prepare to prefabrication, card rack installation to pipe installation, and accessory device installation
Pressure flushing to anti-corrosion insulation, commissioning acceptance
3.2 installation preparation:
3.2.1 seriously familiar with drawings, according to the civil engineering construction progress, reserve a slot holes and embedded parts.
3.2.2 according to the design drawing to draw the location of the pipeline, pipe diameter, change, obligate mouth, slope to draw the construction sketch, card position. The main starting point, and bend at the end, the node, reserved, and coordinates to find good.
3.3 steam pipeline installation:
3.3.1 horizontal pipe should have appropriate gradient, when the slope direction and steam flow in the same direction, I = 0.003 grade, should be adopted when slope direction and steam flow in the opposite direction, the slope should be increased to I = 0.005 ~ 0.01. Main place and should be set at the end of emancipation hydrophobic (figure l - 35).
3.5 square compensator installation:
3.5.1 track of square compensator, before installation, should check whether the compensator is comply with the design requirements, the compensator are three arm at a level, with level examination at the time of installation, adjustment bracket, elevation, right in the position of square compensator gradient within the rules.
3.5.2 compensator should do well the pre-tension installation, fixed by location, and then connected to the pipe. Pretensioning method can be used under jin top the compensator is open or the arms with cold-drawn tube stretcher.
2.6.2 using one thousand catties bumps hold, place the jack horizontal compensator, between the two arms of the great support and block, and then start the jack, the two arms is open, make the pre-drawn joint close to the required clearance. Joint alignment of flat tube with welding the joint welding is good, only when both ends of pretension joint after welding, only jack can be dismantled and put an end to the pre-tension.
3.5.6 level when installation should be consistent with the pipe slope, slope direction. Vertical installation, high should be set up snort valve, low point should be set hydrophobic.
3.5.7 bending compensator, appropriate is used the entire tube bending, such as the need to interface, its joint position should be located in the middle of the straight arm. Square compensator pre-drawn length should be in accordance with the requirements of design drawing, no request for half of its elongation.
3.5.8 piping hot stretching quantity calculation formula:
Δ = aL L (t2 - t1)
Type of Δ L - piping hot stretching quantity (mm); .;
A - the linear expansion coefficient of pipe (steel pipe is 0.012 mm/m. ℃);
L - pipeline calculation length (m);
T2 - thermal coal temperature (℃);
T1 - pipe installation temperature (℃), generally take - 5 ℃.
3.6 the sleeve compensator installed (figure l - 38) :
3.6.1 sleeve compensator (see photo, l - 38) shall be installed around the fixed bracket, and the outer casing side toward the pipe fixed bracket, casing in one end connected to produce thermal expansion pipe.
3.6.2 sleeve compensator pre-stretching length should be according to the design requirements, design has no requirement on table l - 20 require prestretching. When pre-stretching, will first compensator gland loose, pull the casing in the pre-tension of length, and then will be gland to live.
3.6.3 sleeve compensator before installation, the installation of pipe should be the position of the compensator to surrender, on both ends of the pipe welding flange, each request when welding flange centerline of perpendicular to the pipe flange and compensator surface parallel to each other after the padded liner should force uniform.
Sleeve length compensator pre-drawn table table 1-20
Compensator specifications (mm) 15 20 to 25 32 40 to 50, 65, 75, 80, 100, 125, 150
Pull the length (mm) 20 20 30 30 to 40 40 56 56 59 59, 59, 63
3.6.4 radar echoes captured sleeve compensator of the packing, should be used with graphite powder of asbestos rope, asbestos packing or soaked in oil to adjust the tightness of gland in trial operation, no leakage, no leakage, inner sleeve and retractile is advisable.
3.6.5 in order to guarantee the normal work of the compensator, when installation must ensure that the pipeline and the center line of the compensator is consistent, and fill in
3.7.3 compensator installed before both sides should be well fixed card, should be the position of the compensator to surrender when installation of pipelines, on both ends of the pipe welding flange, each request when welding flange centerline of perpendicular to the pipe flange and compensator surface parallel to each other after the padded liner should force uniform.
3.7.4 compensator installed, the card holder may not hanging on the node. Pressure test shall not overpressure, do not allow the lateral force, should be fixed firmly.
3.7.5 corrugated compensator must increase the wall thickness, one end of the inner sleeve and waveform compensation wall welding. When installation should pay attention to make the flow of medium flow from the welding end to free end, and that the slope of the pipe in the same direction.
In the section between two fixed tube frame, do not install more than one type of axial compensator, the distribution of the fixed pipe rack and pipe run l - 40 determined according to drawing.
3.7.5.1 first pipe run frame with compensator end distance of not more than 4 times the pipe diameter;
3.7.5.2 the second pipe run rack with the first pipe run distance of not more than 14 times the pipe diameter;
3.7.5.3 second pipe run outside the biggest guide frame spacing determined by the type:
LGmax = 0.0157
Type of LGmax - largest guide spacing (m);
E - pipe materials elastic modulus (N/cm2);
I - pipe section moment of inertia (cm4);
K - shan bo axial stiffness (N/mm),
K = ∑ K * n
∑ - axial stiffness K (check sample), n - wave number (check sample);
The ex - shan bo axial displacement (mm),
The ex =
X0 -- choose rated displacement of the compensator system design.
3.8 pressure reducing valve installation:
3.8.1 install the relief valve, pressure reducing valve in front of the pipe diameter should be consistent with the diameter of the valve body, valve pipe diameter than the valve after the top diameter of 1 ~ 2.
3.8.2 pressure reducing valve valve must be installed vertically in a horizontal pipeline, the arrow on the valve body must be consistent with the medium flow direction. Pressure reducing valve valve should be installed on both sides, using cut-off valve flange connection.
3.8.3 before the pressure reducing valve should be equipped with filters, diaphragm pressure reducing valve, with equalizer pipe on the equalizing tube connected to a side of low pressure pipe. By-pass pipe is a part of the relief valve installation, troubleshooting occurs when the pressure reducing valve, the cut-off valve of the pressure reducing valve on both sides, for the time being through the by-pass pipe steam supply.
3.8.4 work in order to facilitate the adjustment of the pressure reducing valve, valve in front of the high pressure pipe and valve should be installed on the low pressure pipeline after pressure gauge. Valve after low pressure piping shall be installed on the relief valve, safety valve exhaust pipe connected to the outside.
3.9 hydrophobic device installation:
3.9.1 hydrophobic device should be installed in the place where easy access, and should be close to the condensed water with heat equipment exports. Steam pipe hydrophobic, hydrophobic device should be installed in below location.
3.9.2 installation should be according to the set of design by-pass pipe, flushing, check, check valve, and the location of the dirt separator, etc. With steam equipment should install hydrophobic respectively, several steam for cannot share a hydrophobic.
3.9.3 of hydrophobic position to keep level of imports and exports, cannot tilt installation. Hydrophobic device with the arrow on the valve body shall be consistent with the flow of water, drainage pipe diameter of hydrophobic instinct is less than the imported pipe diameter.
Hydrophobic 3.9.4 by-pass pipe is provided at a part of. When maintenance hydrophobic device, can temporarily run through the by-pass pipe.
4 quality standards
4.1 ensure projects:
4.4.1 concealed pipes and the steam system of hydraulic pressure test results, must comply with the design requirements and the rules and regulations of construction.
Inspection method: check or partition system (period) test record.
4.1.2 pipe fixed stent location and the rules and regulations of construction must comply with the design requirements and construction.
Inspection method: to observe the inspection and control design drawings.
4.1.3 expansion pipe, pressure reducer, hydrophobic, valve installation position must comply with the design requirements, after the pre-tension, regulating pressure must comply with the rules and regulations of construction.
Inspection methods: contrast design drawing check and inspect the pre-tension record, regulating.
4.1.4 pipe welds and curved areas it is forbidden to weld pipe, weld interface from the apex, and the edge of the hanger must be greater than 50 mm.
Inspection method: to observe the feet and check.
4.1.5 dirt separator filter material, specification and bandaging method must comply with the design requirements and the rules and regulations of construction.
Test method: the collapse of the check.
4.1.6 steam supply system when it is completed, it is necessary to check the purge quality situation.
Inspection method: inspect purge records.
4.2 the basic items:
2 that the slope of the pipe should be consistent with the design requirements.
Test method: use level (level) arrows and feet quantity check.
4.2.2 carbon steel pipe of threaded connection shall meet the following requirements: thread clean, neat, without broken wires, or lack of silk, connected firmly. Pipe thread root exposed screw 2 ~ 3, interface without the leakage defects such as hemp oil.
Test method: observation or the collapse of the check.
Holdings of carbon steel pipe welding shall meet the following requirements: joint straightness, weld strengthen face conform to the requirement of design specifications, no burning through, joint, crack and obviously nodules, slag inclusion and porosity defects, such as welding wave of uniform.
Inspection method: to observe with welding test ruler or inspection.
4.2.4 pressure reducer, hydrophobic, valve installation shall meet the following requirements: type, specification of compression strength and leak test results comply with the design requirements and the rules and regulations of construction, installation position and direction of import and export right, connect closely, opening and closing flexible, toward the ease of use, the surface is clean.
Inspection method: arbor inspection and check the factory certificate, test list.
4.2.5 pipe (crane) and tube (block) of the installation shall meet the following requirements: correct structure, buried a right and firm, neat rows, close contact with pipes.
Inspection method, observation and the lever to check.
4.2.6 installed inside a wall and floor of the casing shall meet the following requirements: the top casing in floor above the ground of not less than 20 mm, the bottom and ceiling surface flush, the ends of the casing wall and facing flat, fixed firmly, flush nozzle, girth.
Inspection method: to observe the feet and check.
4.2.7 pipeline, box type and metal stents painting shall meet the following requirements: times comply with the design requirements, types and besmear brushs the paint adhesion is good, no peeling, blister and leakage, uniform film thickness, colour and lustre is consistent, no flow and pollution phenomenon.
Inspection method: to observe the examination.
4.3 allowable deviation projects:
Indoor steam pipe and accessory device allowable deviation of installation and test method are shown in table 1-21.
Indoor steam pipe and accessory equipment installation of allowable deviation and inspection method table 1-21
Will project allow deviation test methods
Longitudinal and lateral every horizontal line 1 m diameter less than or equal to 100 mm
Diameter greater than 100 mm (0.5)
1
With a spirit level, ruler,
Direction of bending length (mm)
(more than 25 m) diameter less than or equal to 100 mm
Diameter greater than 100 is not more than 13 mm
No more than 25 arrows and feet quantity check
The perpendicularity of the riser
Every 1 m (mm)
Full length (more than 5 m) 2
Not more than 10 messenger wire and
'quantity check
ellipticity
10/100 - Dmin on3dmax diameter less than or equal to 100 mm
3 bend pipe diameter greater than 100 mm 8/100 on3dmax quantity with outside calipers and ruler
Crease roughness pipe diameter less than or equal to 100 mm
Diameter greater than 100 mm
5
Pressure reducer, hydrophobic, in addition to
Basin, steam ejector
Geometry size (mm) 5 'quantity check
tube
Thickness (mm) + 0.1 the delta
0.05 the delta amount check with steel needle stab into the insulation layer and ruler
bao
Warm surface roughness coil or sheet (mm)
Spray coating, or other (mm). 5
In 2 m by 10 feet and wedge feeler check
Note: on3dmax, Dmin respectively the maximum diameter and minimum outer diameter;
The delta for pipe insulation layer thickness.
5 finished product protection
5.1 installed pipe shall not be used to haul the load and do support, no stamped on.
5.2 when transporting materials, machines and welds, want to have specific protective measures, will not have dirt, smashing do metope and ground.
5.3 all kinds of auxiliary equipment and appliance, should be equipped with protection cover or barrier protection measures, etc. The valve handwheel after unloading, and when it is completed and unified installed.
6 should pay attention to quality problems
6.1 pipe installation slope is not enough or down the slope. Reason is the pipeline before installation without straightening, local bend bend (dead), level measurement are not allowed to be caused by local down slope or the slope of uneven, hanger spacing is too large, cause local pipe arch the back.
6.2 system is not hot. Reason is the system of air and hydrophobic, steam main slope, cannot be ruled out of the main water along the way. Hydrophobic device malfunction, steam condensation water pipe in return bend or the place such as the door, not installed exhaust valve and low drain valve.
6.3 the riser is not vertical. Mainly because of the branch pipe size, pull, push the riser, or competent finished wall hole, pipe not disconnect.
6.4 attached device is not a right. Reason is that when loading Angle is incorrect, inaccurate and branch pipe size.
6.5 casing on either side of a wall or roof leakage. The reason is too long or steel casing pipe no soldering iron.
6.6 pressure testing and debugging, the pipe is blocked. Mainly reserved mouth didn't install temporary plugging, when installation into debris.
7 should possess the quality of the record
7.1 material equipment should have the factory certificate.
7.2 material acceptance of the equipment comes into play and second interview records.
7.3 steam conduit engineering records.
7.4 steam pipe engineering records.
7.5 expansion pre-stretching records.
7.6 steam pipeline pressure test records of an individual sport.
7.7 steam pipeline system pressure test record.
7.8 pipe hidden record.
7.9 washing records of pipe system.
7.10 the record of system debugging.
The technology standard is applicable to civil and general industrial building steam pressure conduit is not greater than 0.8 MPa and accessory device installation.
2 construction preparation
2.1 material equipment requirements:
2.1.1 pipe material: carbon steel pipe, seamless steel pipe, pipe shall not be bent, rust, not fly, double skin and uneven phenomenon.
2.1.2 pipe fittings: unbiased buckle, square buckle, buckle, defects such as broken wires and Angle is not standard.
2.1.3 valve: casting rules, no burr, crack, flexible switch, thread without damage, straight and right Angle, strength meet the requirements, the handwheel without damage.
2.1.4 accessory device, pressure reducer, hydrophobic, filters, compensator, such as when should comply with the requirement, and the factory quality certificate and instruction manual.
2.1.5 other materials: steel, round steel, pipe clamp, bolts, nuts, gasket, such as electric welding rod choose accord with a standard to ask.
2.2 the main equipment:
2.2.1 equipment: wheel saws, cover silk, machine, electric hammer bench drill, electric welding machine, heat bending, jack.
2.2.2 tools: tongs, the pressure case, vise, welding tools, hand saw, hammer, active board, chain.
2.2.3: other level, chisel, steel tape, sank, string cable line.
2.3 operation conditions:
2.3.1 located within the gutter main installation, should the gutter is cleaned, installed elevator frame, before cover trench cover installation.
2.3.2 overhead the main installation, should be managed in the bracket after fixation, take a good scaffold for installation.
3 operation process
3.1 process:
Prepare to prefabrication, card rack installation to pipe installation, and accessory device installation
Pressure flushing to anti-corrosion insulation, commissioning acceptance
3.2 installation preparation:
3.2.1 seriously familiar with drawings, according to the civil engineering construction progress, reserve a slot holes and embedded parts.
3.2.2 according to the design drawing to draw the location of the pipeline, pipe diameter, change, obligate mouth, slope to draw the construction sketch, card position. The main starting point, and bend at the end, the node, reserved, and coordinates to find good.
3.3 steam pipeline installation:
3.3.1 horizontal pipe should have appropriate gradient, when the slope direction and steam flow in the same direction, I = 0.003 grade, should be adopted when slope direction and steam flow in the opposite direction, the slope should be increased to I = 0.005 ~ 0.01. Main place and should be set at the end of emancipation hydrophobic (figure l - 35).
3.5 square compensator installation:
3.5.1 track of square compensator, before installation, should check whether the compensator is comply with the design requirements, the compensator are three arm at a level, with level examination at the time of installation, adjustment bracket, elevation, right in the position of square compensator gradient within the rules.
3.5.2 compensator should do well the pre-tension installation, fixed by location, and then connected to the pipe. Pretensioning method can be used under jin top the compensator is open or the arms with cold-drawn tube stretcher.
2.6.2 using one thousand catties bumps hold, place the jack horizontal compensator, between the two arms of the great support and block, and then start the jack, the two arms is open, make the pre-drawn joint close to the required clearance. Joint alignment of flat tube with welding the joint welding is good, only when both ends of pretension joint after welding, only jack can be dismantled and put an end to the pre-tension.
3.5.6 level when installation should be consistent with the pipe slope, slope direction. Vertical installation, high should be set up snort valve, low point should be set hydrophobic.
3.5.7 bending compensator, appropriate is used the entire tube bending, such as the need to interface, its joint position should be located in the middle of the straight arm. Square compensator pre-drawn length should be in accordance with the requirements of design drawing, no request for half of its elongation.
3.5.8 piping hot stretching quantity calculation formula:
Δ = aL L (t2 - t1)
Type of Δ L - piping hot stretching quantity (mm); .;
A - the linear expansion coefficient of pipe (steel pipe is 0.012 mm/m. ℃);
L - pipeline calculation length (m);
T2 - thermal coal temperature (℃);
T1 - pipe installation temperature (℃), generally take - 5 ℃.
3.6 the sleeve compensator installed (figure l - 38) :
3.6.1 sleeve compensator (see photo, l - 38) shall be installed around the fixed bracket, and the outer casing side toward the pipe fixed bracket, casing in one end connected to produce thermal expansion pipe.
3.6.2 sleeve compensator pre-stretching length should be according to the design requirements, design has no requirement on table l - 20 require prestretching. When pre-stretching, will first compensator gland loose, pull the casing in the pre-tension of length, and then will be gland to live.
3.6.3 sleeve compensator before installation, the installation of pipe should be the position of the compensator to surrender, on both ends of the pipe welding flange, each request when welding flange centerline of perpendicular to the pipe flange and compensator surface parallel to each other after the padded liner should force uniform.
Sleeve length compensator pre-drawn table table 1-20
Compensator specifications (mm) 15 20 to 25 32 40 to 50, 65, 75, 80, 100, 125, 150
Pull the length (mm) 20 20 30 30 to 40 40 56 56 59 59, 59, 63
3.6.4 radar echoes captured sleeve compensator of the packing, should be used with graphite powder of asbestos rope, asbestos packing or soaked in oil to adjust the tightness of gland in trial operation, no leakage, no leakage, inner sleeve and retractile is advisable.
3.6.5 in order to guarantee the normal work of the compensator, when installation must ensure that the pipeline and the center line of the compensator is consistent, and fill in
3.7.3 compensator installed before both sides should be well fixed card, should be the position of the compensator to surrender when installation of pipelines, on both ends of the pipe welding flange, each request when welding flange centerline of perpendicular to the pipe flange and compensator surface parallel to each other after the padded liner should force uniform.
3.7.4 compensator installed, the card holder may not hanging on the node. Pressure test shall not overpressure, do not allow the lateral force, should be fixed firmly.
3.7.5 corrugated compensator must increase the wall thickness, one end of the inner sleeve and waveform compensation wall welding. When installation should pay attention to make the flow of medium flow from the welding end to free end, and that the slope of the pipe in the same direction.
In the section between two fixed tube frame, do not install more than one type of axial compensator, the distribution of the fixed pipe rack and pipe run l - 40 determined according to drawing.
3.7.5.1 first pipe run frame with compensator end distance of not more than 4 times the pipe diameter;
3.7.5.2 the second pipe run rack with the first pipe run distance of not more than 14 times the pipe diameter;
3.7.5.3 second pipe run outside the biggest guide frame spacing determined by the type:
LGmax = 0.0157
Type of LGmax - largest guide spacing (m);
E - pipe materials elastic modulus (N/cm2);
I - pipe section moment of inertia (cm4);
K - shan bo axial stiffness (N/mm),
K = ∑ K * n
∑ - axial stiffness K (check sample), n - wave number (check sample);
The ex - shan bo axial displacement (mm),
The ex =
X0 -- choose rated displacement of the compensator system design.
3.8 pressure reducing valve installation:
3.8.1 install the relief valve, pressure reducing valve in front of the pipe diameter should be consistent with the diameter of the valve body, valve pipe diameter than the valve after the top diameter of 1 ~ 2.
3.8.2 pressure reducing valve valve must be installed vertically in a horizontal pipeline, the arrow on the valve body must be consistent with the medium flow direction. Pressure reducing valve valve should be installed on both sides, using cut-off valve flange connection.
3.8.3 before the pressure reducing valve should be equipped with filters, diaphragm pressure reducing valve, with equalizer pipe on the equalizing tube connected to a side of low pressure pipe. By-pass pipe is a part of the relief valve installation, troubleshooting occurs when the pressure reducing valve, the cut-off valve of the pressure reducing valve on both sides, for the time being through the by-pass pipe steam supply.
3.8.4 work in order to facilitate the adjustment of the pressure reducing valve, valve in front of the high pressure pipe and valve should be installed on the low pressure pipeline after pressure gauge. Valve after low pressure piping shall be installed on the relief valve, safety valve exhaust pipe connected to the outside.
3.9 hydrophobic device installation:
3.9.1 hydrophobic device should be installed in the place where easy access, and should be close to the condensed water with heat equipment exports. Steam pipe hydrophobic, hydrophobic device should be installed in below location.
3.9.2 installation should be according to the set of design by-pass pipe, flushing, check, check valve, and the location of the dirt separator, etc. With steam equipment should install hydrophobic respectively, several steam for cannot share a hydrophobic.
3.9.3 of hydrophobic position to keep level of imports and exports, cannot tilt installation. Hydrophobic device with the arrow on the valve body shall be consistent with the flow of water, drainage pipe diameter of hydrophobic instinct is less than the imported pipe diameter.
Hydrophobic 3.9.4 by-pass pipe is provided at a part of. When maintenance hydrophobic device, can temporarily run through the by-pass pipe.
4 quality standards
4.1 ensure projects:
4.4.1 concealed pipes and the steam system of hydraulic pressure test results, must comply with the design requirements and the rules and regulations of construction.
Inspection method: check or partition system (period) test record.
4.1.2 pipe fixed stent location and the rules and regulations of construction must comply with the design requirements and construction.
Inspection method: to observe the inspection and control design drawings.
4.1.3 expansion pipe, pressure reducer, hydrophobic, valve installation position must comply with the design requirements, after the pre-tension, regulating pressure must comply with the rules and regulations of construction.
Inspection methods: contrast design drawing check and inspect the pre-tension record, regulating.
4.1.4 pipe welds and curved areas it is forbidden to weld pipe, weld interface from the apex, and the edge of the hanger must be greater than 50 mm.
Inspection method: to observe the feet and check.
4.1.5 dirt separator filter material, specification and bandaging method must comply with the design requirements and the rules and regulations of construction.
Test method: the collapse of the check.
4.1.6 steam supply system when it is completed, it is necessary to check the purge quality situation.
Inspection method: inspect purge records.
4.2 the basic items:
2 that the slope of the pipe should be consistent with the design requirements.
Test method: use level (level) arrows and feet quantity check.
4.2.2 carbon steel pipe of threaded connection shall meet the following requirements: thread clean, neat, without broken wires, or lack of silk, connected firmly. Pipe thread root exposed screw 2 ~ 3, interface without the leakage defects such as hemp oil.
Test method: observation or the collapse of the check.
Holdings of carbon steel pipe welding shall meet the following requirements: joint straightness, weld strengthen face conform to the requirement of design specifications, no burning through, joint, crack and obviously nodules, slag inclusion and porosity defects, such as welding wave of uniform.
Inspection method: to observe with welding test ruler or inspection.
4.2.4 pressure reducer, hydrophobic, valve installation shall meet the following requirements: type, specification of compression strength and leak test results comply with the design requirements and the rules and regulations of construction, installation position and direction of import and export right, connect closely, opening and closing flexible, toward the ease of use, the surface is clean.
Inspection method: arbor inspection and check the factory certificate, test list.
4.2.5 pipe (crane) and tube (block) of the installation shall meet the following requirements: correct structure, buried a right and firm, neat rows, close contact with pipes.
Inspection method, observation and the lever to check.
4.2.6 installed inside a wall and floor of the casing shall meet the following requirements: the top casing in floor above the ground of not less than 20 mm, the bottom and ceiling surface flush, the ends of the casing wall and facing flat, fixed firmly, flush nozzle, girth.
Inspection method: to observe the feet and check.
4.2.7 pipeline, box type and metal stents painting shall meet the following requirements: times comply with the design requirements, types and besmear brushs the paint adhesion is good, no peeling, blister and leakage, uniform film thickness, colour and lustre is consistent, no flow and pollution phenomenon.
Inspection method: to observe the examination.
4.3 allowable deviation projects:
Indoor steam pipe and accessory device allowable deviation of installation and test method are shown in table 1-21.
Indoor steam pipe and accessory equipment installation of allowable deviation and inspection method table 1-21
Will project allow deviation test methods
Longitudinal and lateral every horizontal line 1 m diameter less than or equal to 100 mm
Diameter greater than 100 mm (0.5)
1
With a spirit level, ruler,
Direction of bending length (mm)
(more than 25 m) diameter less than or equal to 100 mm
Diameter greater than 100 is not more than 13 mm
No more than 25 arrows and feet quantity check
The perpendicularity of the riser
Every 1 m (mm)
Full length (more than 5 m) 2
Not more than 10 messenger wire and
'quantity check
ellipticity
10/100 - Dmin on3dmax diameter less than or equal to 100 mm
3 bend pipe diameter greater than 100 mm 8/100 on3dmax quantity with outside calipers and ruler
Crease roughness pipe diameter less than or equal to 100 mm
Diameter greater than 100 mm
5
Pressure reducer, hydrophobic, in addition to
Basin, steam ejector
Geometry size (mm) 5 'quantity check
tube
Thickness (mm) + 0.1 the delta
0.05 the delta amount check with steel needle stab into the insulation layer and ruler
bao
Warm surface roughness coil or sheet (mm)
Spray coating, or other (mm). 5
In 2 m by 10 feet and wedge feeler check
Note: on3dmax, Dmin respectively the maximum diameter and minimum outer diameter;
The delta for pipe insulation layer thickness.
5 finished product protection
5.1 installed pipe shall not be used to haul the load and do support, no stamped on.
5.2 when transporting materials, machines and welds, want to have specific protective measures, will not have dirt, smashing do metope and ground.
5.3 all kinds of auxiliary equipment and appliance, should be equipped with protection cover or barrier protection measures, etc. The valve handwheel after unloading, and when it is completed and unified installed.
6 should pay attention to quality problems
6.1 pipe installation slope is not enough or down the slope. Reason is the pipeline before installation without straightening, local bend bend (dead), level measurement are not allowed to be caused by local down slope or the slope of uneven, hanger spacing is too large, cause local pipe arch the back.
6.2 system is not hot. Reason is the system of air and hydrophobic, steam main slope, cannot be ruled out of the main water along the way. Hydrophobic device malfunction, steam condensation water pipe in return bend or the place such as the door, not installed exhaust valve and low drain valve.
6.3 the riser is not vertical. Mainly because of the branch pipe size, pull, push the riser, or competent finished wall hole, pipe not disconnect.
6.4 attached device is not a right. Reason is that when loading Angle is incorrect, inaccurate and branch pipe size.
6.5 casing on either side of a wall or roof leakage. The reason is too long or steel casing pipe no soldering iron.
6.6 pressure testing and debugging, the pipe is blocked. Mainly reserved mouth didn't install temporary plugging, when installation into debris.
7 should possess the quality of the record
7.1 material equipment should have the factory certificate.
7.2 material acceptance of the equipment comes into play and second interview records.
7.3 steam conduit engineering records.
7.4 steam pipe engineering records.
7.5 expansion pre-stretching records.
7.6 steam pipeline pressure test records of an individual sport.
7.7 steam pipeline system pressure test record.
7.8 pipe hidden record.
7.9 washing records of pipe system.
7.10 the record of system debugging.
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