(Update the most practical construction installation and construction technology standards per week)

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Building water supply and drainage and heating series construction process


Building water -to -water metal pipeline


Indoor heating pipeline construction process


Construction process for building water polypropylene pipelines


Polyethylene pipeline installation construction process


Construction technology of building water composite pipelines


Sanitary ware construction technology


The radiator construction process


Low -temperature hot water floor radiation heating system construction process


Construction process of building drainage metal pipelines


Construction process of building drainage plastic pipelines


Civil building centrifugal water pump construction process


Outdoor heating construction process


Construction process for boiler and subsidiary equipment


Pipeline and equipment anti -corrosion engineering construction process


Pipeline and equipment insulation engineering construction technology


Automatic water spray fire extinguishing system construction process


Fire Proterment System Construction Technology


Gas fire extinguishing system construction process


Construction technology for the construction of the water metal pipeline asbestos cement


Building a water metal pipeline rubber ring inheritance connecting construction technology

twenty one

Construction process of water system in the building

twenty two

Swimming and public bathroom water system construction technology

twenty three

Construction process for solar light thermal system

This process standard is suitable for installation projects for civilian and general industrial buildings (including hot and cold water pipes for water casting iron pipes, galvanized carbon steel pipes, copper pipes and thin -walled stainless steel pipes).

1 Reference standard

“Specifications for the Construction Quality Acceptance of Water Drainage and Heating Engineering Construction” GB 50242-2002

“Technical Regulations for Building Water Metal Pipeline Engineering” CJJ/T 154-2011

CECS 277: 2010, CECS 277: 2010

CECS171: 2004 CECS171: 2004

CECS228: 2007

“Stainless Steel Card Pressure Pipe” GB/T 19228.1—2011


“Thin Wall Stainless Steel Pipes for Stainless Steel Pressure Pipe Connection” GB/T 19228.2—2011

“Rubber -Os O -Sealing Circle for Stainless Steel Card Pressure Pipe” GB/T 19228.3—2011

“Thin Wall Stainless Steel Inner Press Press Pipe and Pipe Pipe” CJ/T 232-2006

“Thin Wall Stainless Steel Pipe” CJ/T 151-2016

2 term

2.0.1 Thin -wall stainless steel pipe

The ratio of wall thickness to the outer diameter is not more than 6%.

3 Construction preparation

3.1 Operation conditions

3.1.1 Construction diagrams and design documents are complete, and technical intercourse has been carried out.

3.1.2 Construction organizational design or construction plan has been approved.

3.1.3 Construction workers have been professional training.

3.1.4 Temporary facilities such as water, electricity, and material storage venues of the construction site can meet the requirements.

3.1.5 Before the laying of the underground pipeline, the heart and soil must be returned to the bottom of the pipe at the bottom of the pipe, and the pipes have been kept on the pipes or installation pipes at the wall of the pipeline. The coordinates and elevations are correct.

3.1.6 The dark installation pipeline is installed before the trench cover or the ceiling is not closed. Its steel bracket has been installed and the requirements are completed.

3.1.7 Installation of bright trunk and dried tube must be performed after the structure of the installation layer is completed. The templates and debris in the installation position along the pipeline have been cleaned up.

3.1.8 The riser installation is performed after the main structure is completed. The high -rise buildings are properly inserted after the main structure meets the installation conditions. Each layer shall be marked with a clear elevation line. When installing the vertical well pipe, the templates and debris in the vertical shaft should be cleaned and there are anti -falling measures.

3.1.9 Tube installation should be completed in the wall, and before the wall is decorated (including the installation support).

3.2 Materials and equipment

3.2.1 The specifications of galvanized carbon steel pipes and pipe parts should meet the design requirements. Galvanized inside and outside the tube wall should be uniform, without rust and spines. The pipes have no bias, fascination, incomplete silk buckle, or inaccurate angle. The pipe should have a product quality certificate.

3.2.1 The specifications of copper pipes, copper pipes and pipe parts should meet the design requirements. The surface and outside of the tube wall should be smooth, without pinholes, cracks, peeling, scars and layers. Bronze tubes must not have green rust and severe zinc.

The exterior defect allowance of the copper pipe and brass pipeline is as follows: the depth of the vertical scratch, the wall thickness ≤ 2mm, not greater than 0.04mm; the wall thickness is> 2mm, not greater than 0.05mm. The horizontal concave depth or protruding height is not greater than 0.35mm. Scar blocks, foaming, bumps, or concave pits, the depth of no more than 0.03mm, and the maximum size should not be greater than 5%of the pipeline length. The pipe should have a product quality certificate and a factor certificate.

3.2.3 The specifications of the water pipe and pipelines of the cast iron should meet the design pressure requirements. The wall of the pipe is thin and uniform, the internal and external smoothness, and there must be no sandy eye, cracks, burrs, and scar blocks. The anticorrosive coating should be neat and uniform, and the adhesion is firm. The pipe should have a product quality certificate or a factor certificate.

3.2.4 Thin -wall stainless steel pipe and pipelines, the allowable deviation of the inner and outer diameters shall meet the current national standards “Stainless Steel Pressure Pipe Pipe Connected Pipe Connected to the Thin Wall Stainless Steel Pipes” GB/T19228.2, “Stainless Steel Press Pipe Pipe” GB/T19228. 1 and the current industry standards “Thin Wall Stainless Steel Pipe” CJ/T151, “Thin Wall Stainless Steel Internal Card Press Pipe Pipe Pipes and Pipe Pipes” CJ/T232.

3.2.5 thin -walled stainless steel tube card pressure connection sealing ring, which should comply with the provisions of “rubber O -type sealing ring for stainless steel stuck pipes” GB/T19228.3. The sealing ring of other connection methods shall, its structure type, shape size, and material shall meet the requirements of relevant standards.

3.2.5 The specifications of the valve should meet the design requirements. The surface of the valve body is smooth, no cracks, flexible switching, tightly closed, the fillers are sealed intact, and the hand wheels are complete and non -damaged.

3.2.6 机具:套丝机、砂轮锯、台钻、电锤、手电钻、电焊机、直流电焊机、氩弧焊机、薄壁不锈钢管压式连接专用挤压工具、电动试压泵、套丝扳、管钳、压力钳、手锯、手锤、活扳手、煨弯器、手压泵、扳边器、橡皮锤、调直器、锉刀、捻凿、断管器、六角量规、 Ordinary regulations, horizontal ruler, thread pendant, steel rolls, steel plate ruler, flange angle, etc.

4 operation process

4.1 Process process

Installation preparation → prefabricated processing → dry pipe installation → riser installation → branch pipe installation → pipeline test pressure → pipeline system flushing → pipeline anticorrosion and insulation

4.2 Installation Preparation

Prepare the construction method and specific measures determined by the construction plan. Please refer to the relevant professional equipment drawings and civil construction drawings to check whether the coordinates and elevations of various pipelines are crossed, and the pipeline arrangement space is reasonable.

4.3 Prefabrication processing

4.3.1 Pipeline installation is processed in prefabricated according to the system and segments. Draw the construction sketches such as pipelines, variable trails, reserved pipe ports, valve positions, etc. according to the design drawings. Mark on the structure location of the actual installation, and accurately install the accurate size of the actual installation according to the marking segments. Then according to the sketch, the size prefabricated processing (tube disconnection, silk, parts, straight, straight, correction), group number combination according to the tube segment. The size of the consequences should consider the convenience of transportation.

4.3.2 The water pipeline must be adapted to pipes that are compatible with the pipe. The ingredients involved in the water supply system must meet the sanitary standards of drinking water.

4.4 Installation of dry pipes

The level of the level of the water -to -water introduction tube and drainage exhaust pipe shall not be less than 1m. When the indoor water supply and drainage pipes are parallel to laying, the minimum level of the two pipes shall not be less than 0.5m; when the cross is laid, the vertical net distance shall not be less than 0.15m. The water supply pipe should be paved on the drain pipe. When the water pipe must be paved under the drainage pipe, the water pipe should be added with a pipe, and the length should not be less than 3 times that of the drainage pipe diameter.

4.4.1 Installation of the water cast iron pipeline:

1 Clean the pipe bore before installation of the pipe, remove the sand, burrs, and asphalt at the end of the inner side and the outside of the socket, and clean it with the wire. The promotion is arranged in the order of the direction of the smooth water. After looking for a straight, fix the pipeline. The pipeline turning and the beginning should be supported to prevent the axial movement from moving at the time of the twist mouth. All pipe ports are blocked at any time.

2 twist hemp: twist the oily hemp into twist -like, its diameter should be 1.5 times the cycle gap, 150mm longer than the outer tube, and twist into the laboratory with hemp. Each circle of coats should be staggered, and after twisting. After twisting the oily hemp, mix with the cement above 32.5 or more (the water ash ratio is 1: 9). Use the twist to fill the ash into the promotion. The surface of the flat mouth is flat and full, and it can emit dark light. The ash surface after twisting should be 1 ~ 2mm lower than the latter. After twisting, it should be maintained. It can be wiped outside the interface or covered with wet grass bags. Watering four times a day, generally maintenance of 1 ~ 2D. Anti -freezing measures should be taken in winter.

3 When the water casting iron pipe is connected to the galvanized steel pipe, it should be installed in several ways shown in Figure 4.4.1.

4.4.2 Installation of galvanized pipes for water

1 When installing, it generally starts from the total import. The total import end is added with temporary wire blocking or flange for test pressure. When the design requires anticorrosion, it should be pre -made after prefabrication and before installation. Freate the prefabricated pipes to the installation site and lift according to the number.

2 After the installation is in place, first fix it on the bracket, then review the installation position, direction, slope, dumping and variable diameter of each section, and fix the pipes on the bracket after passing.

3 The variable diameter of the trunk is about the diameter of the large tube after the branch pipe is divided, but not more than 100mm.

4 The hot water pipes pass through the wall and floor, and the sleeve and fixed bracket should be added according to the design requirements. The sleeves are generally made of galvanized steel rolls, but special rooms such as bathrooms, laundry rooms, kitchens, and bathrooms must be used.

The installation of 5 sets of pipes should be carried out with the pipes, and it is pre -set on the tube and fixed on the reserved hole to prevent falling off. The tube installed in the floor should be 20mm higher than the top of the floor, the top of the bathroom and the kitchen should be 50mm higher than the ground, and the bottom should be flat at the bottom of the floor; Essence The gaps between the sleeves of the floor and the pipes are filled with oil hemp and waterproof ointment. The wall sleeve should be filled with non -flames such as asbestos ropes and the surface is smooth.

6 The installation of the telescopic device should be pre -stretched in accordance with regulations. The length of the direct tube of the copper wave compensator must not be less than 100mm. The high point of the turning point must have the wind, the low point and the water leakage device.

7 Galvanized pipes with a diameter of less than or equal to 100mm shall be connected by threading, and the damaged galvanized surface layer and the exposed thread part should be used for anti -corrosion treatment; the galvanized steel pipe with a diameter of more than 100mm shall be welded or dedicated to the card cover type. Pipeline connection. After the pipeline is installed, the water pressure test is performed. After the leakage is not installed, the number is disassembled and the flange is disassembled. The welding is galvanized, and then the number is performed according to the number.

4.4.3 Copper tube installation

1 Copper pipe connection can be used for dedicated joints or welding. When the diameter is less than 22mm, it is advisable to use inheritance or sleeve welding. Equal welding should be used at 22mm. The copper pipe thread connection is the same as the standard of welding steel pipes.

2 The form of flange connections of copper pipes generally include edge -fluttering flange, flat welding flange, and welding flavor. The sealing pads between copper pipe flanges are generally used. It should be according to design requirements.

3 The welding of copper pipes. When the design is not clearly designed, the welding of the copper pipe should be welded by handmade tungsten poles, and the copper alloy pipe should be welded with oxygen-acetylene welding. When welding, the welded and welded parts must be properly used in accordance with the requirements of the welding process, and the welding operating regulations must be strictly observed.

4 The spacing spacing of the copper tube vertical or horizontal installation shall meet the requirements of Table 4.4.3.

Table 4.4.3 The maximum spacing of copper pipeline stent

Nominal diameter (MM)











The maximum spacing of the bracket (M)

Vertical tube






Horizontal Pipe


4.4.4 thin -walled stainless steel pipe installation

1 When a thin -walled stainless steel pipe uses a stuck -type connection, a circular voltage connection, a dual -card pressure connection, or an inner plug -in card pressure connection, the size of the pipe and pipe parts should be supported, and the deviation should be within the allowable range. Before the group pair, the sealing ring position should be correct.

2 Thin -wall stainless steel pipeline stuck, ring pressure type, dual -card pressure type, and inner plug -in card pressure connection shall adopt a dedicated extrusion tool, and the following regulations shall be compared with:

(1) When the nominal diameter of the pipeline is greater than or equal to 100mm, an electric tool or hydraulic extrusion tool should be used;

(2) The dedicated squeezing tool should have a limit device and an emergency pressure leakage valve. When an error occurs, emergency measures should be taken at any time to release the squeezing clamping.

(3) The tip of the dedicated extrusion tool should be made of high -quality alloy steel, and it should be treated with special thermal treatment;

(4) The dedicated extrusion tool should be convenient to operate, the process of pressure and pressure discretion should be fully controlled, and the phenomenon of unstable pressure, not in place or over -pressure shall not occur;

(5) The dedicated tools should adopt a full seal design. During the use process, no oil leakage and pressure loss may occur;

(6) The dedicated squeezing tools and the pressing clamp should be lightweight, and integrated design should be adopted, and it should be formed at one time;

(7) Special squeezing tools should be developed simultaneously according to the thin -walled stainless steel pipe — pipe parts — squeezed clamp.

3 Thin -wall stainless steel pipeline card pressure type, ring voltage, dual -card voltage, and inner plug -in card pressure connection shall comply with the following regulations:

(1) The sealing ring should be covered on the pipe, inserted into the bottom of the promotion, and then pushed the sealing ring into the gap at the connection; the insertion must not be skewed, the wound, distorted sealing ring or the sealing ring must be dropped;

(2) The socket should be inserted to the bottom of the promotion, and the depth of the insertion shall meet the requirements;





















(3) Squeeze and connecting special tools should be adopted. The extrusion position should be under the tip of the dedicated tools. The lip mouth of the dedicated tool should be tightly and vertical with the pipe or pipe;

(4) The pipelines that are greater than or equal to 80mm of pipelines and the ring pressure connection of the pipelines should also be squeezed in the second tight slot; when the second tight tie slot is squeezed, the ring pressure tool should be moved to the center of the pipeline. A sealing belt length, then squeeze connection;

(5) Lubricant is strictly prohibited when squeezing;

(6) The module of the special tool must be used in groups.

4 connections between thin -walled stainless steel pipes and valves, water meters, water mouths, etc. should be converted. It is strictly forbidden to set silk on thin wall stainless steel water pipes.

5 After the connection, the connection should be checked, and the following regulations shall be met:

(1) The indentation of the connection of the circumference should be uneven and tight, and there must be no gap.

(2) The shape and size of the extrusion site should be checked in a dedicated quantity regulation, and the following regulations shall be met:

1) Card pressure connection, dual -card pressure connection, and inner plug -in card -type connection shape shall be hexagonal, and the hexagonal regulations shall be used to confirm the size;

2) The shape of the ring pressure connection should be circular, and the size can be confirmed in the size.

(3) When the connection is not included in place, the joint should be removed and re -connected.

(4) When the connection is not in place, check whether the special tool is intact. If the tool is damaged, it should be repaired, and then squeeze the connection that is not in place. Use the regulations to check and confirm again.

(5) When connecting to the converted thread joint, squeeze connection should be performed after the tight thread is in place.

6 The spacing of the fixed bracket of thin -walled stainless steel pipes should not be greater than 15m.

7 The maximum spacing of the sliding bracket of the thin -walled stainless steel pipe should meet the requirements of Table 4.4.4.

Table 4.4.4 The maximum spacing of sliding brackets of thin -walled stainless steel pipes

Pipeline nominal diameter (MM)

Maximum spacing of sliding bracket (M)

Horizontal Pipe













8 When using a carbon steel metal tube card or suspension, a soft objects such as plastic bags or rubber should be used between the metal tube card or the pipeline.

4.5 Rankish installation

4.5.1 Religion Mingguang:

1 From top to bottom to unified hanging line installation cards, the prefabricated riser is arranged in layers in order, installing in order, and marking the mark when it is good.

2 When the thread is connected, it should be tightened in the direction of the tightening direction, and it must not be poured back. The tightening thread buckle should be exposed to 2 ~ 3 buckles to remove the exposed hemp head, and whether the height, direction, and location of the school nuclear reserved their mouths are correct. The destruction surface and exposed wire buckles of galvanized layer should be processed, generally one camphor and two noodle paint.

3 The beginning of the pipeline of water pipe and 3 or more water -containing spots should be installed with demolished connectors.

The four tubes shake the mouth and add a temporary silk block. The installation orientation of the riser valve should be easy to operate and repair. After the installation is installed, use a wire pendant to find it directly.

4.5.2 Venture installation

1 The riser in the vertical well should generally be installed before the structural template is demolished and the vertical well partition wall is not built. The card parts installed in the vertical well should be set up in the tube port, and the card is installed on the upper and lower hanging lines. For the same position in the same vertical well, the installation order should be determined according to the operating conditions.

2 You need to set the pipeline of the sleeve. When you are in place, you should put the sleeve, and then fix the sleeve.

3 When installing the insulation pipe in the vertical well, welded a triangular iron on the riser, supported on the horizontal bracket, and pad the rubber insulating pad between the triangular iron and the bracket with a thickness of 3 ~ 5mm.

4 The riser installed in the wall should be reserved in the structure of the structure.

The threw mouth of the five tubes should be exposed and temporarily blocked.

4.6 Tube installation

4.6.1 First pop up the support position line on the wall to install the prefabricated support from the risers in turn; if there is a valve, remove the valve cap and install it. Fixed card.

4.6.2 Approval of the height and position of the cold and cold water reserved in different sanitary appliances, and the position is correct. Find the tube card component after the flat and find the tube, remove the temporary fixed card, and get the temporary silk block.

4.6.3 If the tube is equipped with a water meter, the connecting tube is installed first.

4.6.4 Pharmaceutical hidden installation

1 Determine the drawing line positioning after the height of the branch, and remove the pipe groove.

2 Place the prefabricated support in the groove, and fix it with hook nails after finding it.

3 The reserved port of the hot and cold water of the sanitary appliance should be made in the bright place, and the silk block is added.

4.6.5 Cold and hot water pipes should be installed at the same time in compliance with the following requirements:

1 When installing up and down, the hot water pipe should be above the cold water pipe.

2 During vertical parallel installation, the hot water pipe should be above the cold water pipe.

4.6.6 The water level pipe should have a slope of a 2/1000 ~ 5/1000 slope to the water leakage device.

4.7 Pipeline test pressure

4.7.1 Pipeline test pressure generally divided into single test pressure and system pressure test. The single test pressure is the installation of the pipelines that complete or concealed parts of the dry pipe, and the water pressure test is performed according to the design requirements; The division of the scope should be corresponding to the inspection batch.

4.7.2 Pipeline hydraulic test. When the design is irregular, the pressure on the water supply pipe system test pressure of various materials is 1.5 times the work pressure, but it must not be less than 0.6MPa. The pipeline system observes 10min under the test pressure. The pressure drop should not be greater than 0.02MPa, and then it is reduced to work pressure inspection. No leakage is qualified.

4.7.3 The heat water supply system is installed, and the water pressure test should be performed before the pipeline insulation. When the design is irregular, the water pressure test pressure of the hot water supply system should be 0.1MPa at the work pressure of the system vertex, and the test pressure at the system apex is not less than 0.3MPa. The pressure of the pipeline system is not greater than 0.02MPa in the test pressure, and then the pressure is reduced to work pressure check. The pressure should not decrease and there is no leakage.

4.7.4 Connection test pump is generally located at the entrance of the first or outdoor pipelines. The test pressure is subject to the lowest point of the system. The accuracy of the pressure meter used should not be less than 1.5, the range should be 1.5 to 2 times the pressure test pressure, and within the qualified verification cycle.

4.7.5 Before test pressure, the reserved port should be blocked. Close the imported valve, all the water leak valves and low -end ventilation valves, and open the wind release valve at the highest point of each branch and the highest point of the system valve and the system.

4.7.6 Open the water source valve, fill the water in the system, clean the air after full water, and turn the valve.

4.7.7 Check all the system. If there is a leakage, it should be marked and processed. After repairing it, it is filled with water for pressurization. Relevant personnel acceptance and handling the transfer procedures. Finally leak water.

4.7.8 When the project is completed during the winter construction period and cannot be heated in time, it is necessary to take reliable measures to leak water to prevent frozen tutoring pipelines and equipment.

4.8 Pipeline system flushing

The pipeline is rinsed after the test is passed or delivered before delivery. When rinse, it is continuously rinsed with the maximum pressure and traffic that may be achieved in the system. Check the acceptance procedures after being qualified.

4.9 Pipeline anticorrosion and insulation

4.9.1 Pipeline anticorrosion: The presence and installation of the water pipeline and the installation of the water pipeline are constructed in accordance with the design requirements and national acceptance specifications. All types of steel brackets and pipeline galvanized layers and exposed wire buckles should be brushed to prevent rust paint.

4.9.2 Pipeline insulation: There are three forms of thermal insulation of pipes to the water pipeline in thermal insulation, and pipeline anti -heat loss and temperature -preserving pipes. The insulation material and thickness are based on design requirements. For details Related content of insulation.

5 Quality Standards

5.1 Master Control Project

5.1.1 Life -giving up water system pipelines must be washed and disinfected before delivery, and the sampling inspection by relevant departments can be used in accordance with the national “Standards for Drinking Water in Life”.

5.1.2 The results of the hidden pipeline and the water pressure test of the water supply system must meet the design requirements and the construction quality acceptance specifications.

5.1.3 After the water system is completed or before delivery, the water traffic test must be performed and recorded.

5.1.4 After the hot water supply system is completed or before delivery, it must be bleached.

5.1.5 The indoor direct burial of the water pipeline (except plastic pipes and composite pipes) should be processed. The material and structure of the anti -corrosion layer of the buried pipeline should meet the design requirements.

5.1.6 Compensation of the thermal water pipeline.

5.2 General projects

5.2.1 Pipeline installation slope shall meet the design regulations.

5.2.2 The shape of the welded seam welded and welded by pipelines and pipes should comply with the provisions of the drawings and process files. Defects such as pores.

5.2.3 The inheritance of the metal pipeline and the hoop interface structure and all fillers meet the design requirements. The gray mouth is dense and full, the rubber ring interface is straight and uncomfortable, the gap between the mouth is accurate, the seam gap is uniform, the gray mouth is smooth, smooth, and the maintenance is good. Essence

5.2.4 The installation position and structure of the pipeline branch (hanging, support) frame, pipe seat (pier) are correct, and the buried is firm and arranged neatly. The support and pipeline are in close contact. Between the copper pipe and the pipeline bracket, the face should be well -touched and flexible. Soft -walled stainless steel pipes and carbon steel metal tube cards should be used in plastic bands or rubber and other soft objects.

5.2.5 Valve Installation: Model, specifications, pressure resistance and strict tests meet the design requirements and specifications of construction quality acceptance; the location and direction are correct, the connection is firm, close, flexible, and facing reasonable, and the surface is clean.

5.2.6 The allowable deviation of the water pipeline and valve installation shall meet the requirements of Table 5.2.6.

Table 5.2.6 The allowable deviation of the water pipeline and valve installation



Allow deviation (MM)


Horizontal pipeline bending

Steel Pipe

Per meter

The whole factory is 25m or more


Plastic composite tube

Cast iron pipe




More than 5m

Puppet 8

≯ 10

Tube section and row valve

Spac (spacing on the same plane

5.2.7 The allowable deviation of the installation of hot water supply pipelines shall meet the requirements of Table 5.2.7.

Table 5.2.7 The allowable deviation of the installation of hot water supply pipelines

Traveler pipeline vertical and horizontal bending (MM)

Pipe diameter ≤100mm

Tube diameter> 100mm

Full length (above 25M)


Verticality (MM)

Full length (above 5M)

Bending tube

Oval rate



Wrinkle unevenness (mm)



Note: DMAX and DMIN are the maximum outer diameter and minimum outer diameter of the tube.

6 finished product protection

6.0.1 The installed pipes must not be used as a support or put on the handboard, and the pressure must not be stepped.

6.0.2 During the interrupt construction, the pipe must do a good job of temporary closed work.

6.0.3 Pipelines should be protected before civil jets to prevent mash pollution from pipelines.

6.0.4 Copper pipes should prevent the surface of the pipeline from scratching the surface of the pipeline during the installation process.

6.0.5 Stainless steel pipes prevent contact with black metals to prevent pollution from stainless steel pipelines.

7 Note

7.1 The quality problem that should be paid attention to

7.1.1 Pipeline galvanized layer is damaged.

7.1.2 The height of the riser shake is inaccurate.

7.1.3 The riser is inconsistent with the wall or semi -dark.

7.1.4 The sleeve of the hot water riser leaks down.

7.2 Pay attention to safety issues

7.2.1 When installing a pipeline in the vertical well, there must be protective facilities and corresponding measures such as the safety net to prevent the pipes and other debris from falling from the pipe well.

7.2.2 When welding in the tube well, safety measures such as fire prevention must be available to prevent fire from causing fire from the top.

7.2.3 During the pipe counterpart operation, it is strictly forbidden to put your hands on the inside of the counterpart or French connection. When moving and stringing the pipes, the personnel movement must be consistent.

7.2.4 When a thin -walled stainless steel pipe is squeezed by special tools, the tool should be limited to the device and emergency pressure leakage valve to prevent over pressure or other dangers.

7.3 Pay attention to green construction issues

7.3.1 The noise generated during pipeline cutting should be effectively controlled; the corners in the construction are recovered in time.

7.3.2 The flushing and disinfection waste liquid of the pipeline should be discharged to the designated place to prevent the pollution environment.

8 Quality Record

8.0.1 Materials issued a certificate of qualification and material certificate.

8.0.2 Single test records for water and hot water pipelines.

8.0.3 Records of the hidden project inspection and acceptance of water and hot water pipelines.

8.0.4 Test down record of water and thermal water pipeline system.

8.0.5 Rinse records of water and hot water pipeline systems.

8.0.6 Water records of water and hot water pipelines.

8.0.7 Call of hot water system debugging records.

8.0.8 records of sub -divisions, sub -parts, sub -items, and inspection batch quality acceptance records.

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Allow deviation (MM)




Steel Pipe

Per meter

Per meter

Per meter

Per meter

Per meter

Per meter

Per meter

The whole factory is 25m or more

The whole factory is 25m or more




Plastic composite tube

Cast iron pipe









More than 5m

More than 5m

Puppet 8

≯ 10

Pipe diameter ≤100mm

Pipe diameter ≤100mm

Pipe diameter ≤100mm

Tube diameter> 100mm

Tube diameter> 100mm

Tube diameter> 100mm