① The piping system should all be made of stainless steel pipes and fittings, and should be insulated when in contact with other metal materials.
② For buried thin-walled stainless steel pipes, 022Cr17Ni12Mo2 grade materials should be used, and anti-corrosion measures should be taken. Zhengkang customized epoxy resin anti-corrosion pipe or three oil and two cloth anti-corrosion methods can be used.
③ The pipeline shall not be cast in the reinforced concrete structure layer.
When the length of the straight section of the hot water thin-walled stainless steel pipe exceeds 15M, measures should be taken to compensate the pipe. When the nominal size is not less than 40mm, stainless steel wave expansion joint or linear temperature compensator should be set, and the compensation amount is calculated as 1.21 mm/m (≤ 60 ℃)
⑤ ≤ DN50 pipe diameter should adopt plastic-coated thermal insulation stainless steel pipe,>DN50 pipe diameter should adopt foamed polyethylene, rubber, glass wool and other thermal insulation materials without soluble chloride ion for thermal insulation, and the outer layer should be wrapped with aluminum foil paper for protection.

① Stainless steel pipe can not be in direct contact with cement slurry, mortar, plate and concrete
② Intermittent installation or after completion, the pipe opening should be blocked
③ When the pipeline passes through the wall, through the floor or the wall is concealed, the holes and slots shall be reserved in coordination with the project.
④ When the pipeline passes through the basement or the outer wall of the underground structure, waterproof measures shall be taken
⑤ When the stainless steel pipe is connected with the valve water meter, the conversion head shall be applied, and the wire shall not be set.
⑥ Pipeline installation shall be horizontal and vertical

a) The top of the casing in the toilet and kitchen shall be 50mm higher than the decorative ground.
B) The top of the casing in other floors shall be 20mm higher than the decorative ground.
c) The bottom of the casing shall be level with the floor.
d) Both ends of the casing in the wall shall be level with the finish.
e) The gap between the casing installed in the floor and the pipe shall be filled with dense flame-retardant materials and waterproof ointment, and the end face shall be smooth.

① Cleaning agent with high chloride content shall not be used for wall cleaning
② Do not deliver drinking water that does not meet the requirements of the Sanitary Standard for Drinking Water (GB5749-2006).

① Try to adopt the pipeline design of going to the top instead of going to the ground.
② Pipes shall not be laid in bedrooms, storage rooms, distribution rooms, strong and weak current pipeline wells, flues, air ducts and drainage ditches.
③ Pipe wall

① B- type elbows are used at corners and narrow places to ensure the distance between pipe fittings.
② When some pipelines need to be buried,
Using FAQs:
Drinking water that does not meet the requirements of the Sanitary Standard for Drinking Water (GB5749-2006) shall not be transported.

1. When the gas pipeline adopts crimping type carbon steel connection, the explicit setting method shall be adopted.
2. Except for drainage, pipelines can be laid in drainage ditches. Other situations should not be directly laid in drainage ditches, structural floors, bedrooms, storage rooms, distribution rooms, strong and weak current pipeline wells, flues, air ducts and drainage ditches.
3. When the pipeline crosses the foundation, load-bearing wall or floor of the building, the casing shall be set. When the casing passes through the floor, the upper port of the casing shall not be less than 50mm above the ground elevation, and shall not be less than 50mm above the ground elevation of the toilet. Fireproof and waterproof sealing measures shall be taken between pipe and casing as required.
4. Main pipe and vertical pipe shall be laid in suspended ceiling, pipe well and pipe hole. Branch pipe shall be laid in suspended ceiling, leveling layer of floor (ground) surface or pipe groove along the wall. Steel pipe laid in pipe groove shall be fixed by pipe clip. The outer diameter of branch pipe laid in leveling layer or pipe groove shall not be greater than 25mm.
5. Special conversion joints shall be used at the inlet pipe, folding angle inlet pipe fittings, branch pipe connections and instrument interfaces.
6. The pipeline should not pass through the settlement joint, expansion joint and deformation joint of the building. When crossing is necessary, drainage measures shall be taken and the following installation methods shall be adopted for protection:
(I) pipes crossing settlement joints, expansion joints and deformation joints shall adopt flexible connection or set square compensator, and shall be installed horizontally;
(2) There should be a clearance of not less than 150mm on and under the outer surface of the pipeline or pipeline insulation layer;
The water inlet end of the (III) pipeline should be provided with a maintenance valve.

1. When the pipeline is exposed, the installation shall be carried out after the wall surface of the civil engineering is whitewashed. Before installation, should first check the position of the reserved hole is correct.
2. The distance between fixed supports of pressure-connected carbon steel pipes should not be greater than 15m. The distance between fixed supports of hot water pipes should be determined according to the thermal expansion of the pipeline and the allowable compensation of expansion joints. The fixed support shall be set at the positions of reducer, branch, interface and crossing both sides of load-bearing wall and floor slab.
3. The spacing of pipeline movable supports can be determined according to Table 3.1.
Table 3.1 Spacing of movable supports of pipeline (mm)
Nominal size DN 10~15 20~25 32~40 50~65 65~100
Horizontal pipe 1000 1500 2000 2500 3000
riser 1500 2000 2500 3000 3500
4. When installing pipes with a nominal size of not more than 25mm, plastic pipe cards can be used.
5. The water supply hydrant and water distribution point shall be fixed with metal pipe clip or hanger; pipe clip or hanger should be set at 40mm ~ 80mm away from the fittings.
6. The distance between the outer wall of the exposed pipe and the decorative wall surface shall meet the following requirements:
1 When the nominal size of the pipeline is DN10 ~ DN25, the distance shall not be less than 40mm;
2 When the nominal size of the pipeline is DN32 ~ DN50, the distance shall not be less than 50mm;
3 When the nominal size of the pipeline is DN65 ~ DN100, the distance shall not be less than 100mm.
7. For concealed pipes, anti-corrosion tape shall be wound on the outer wall of carbon steel galvanized steel pipe or carbon steel coated galvanized steel pipe shall be used. The pressure test shall be completed before the pipeline is concealed, and the acceptance records of concealed works shall be provided.
8. When laying pipes, there shall be no axial bending and twisting, and no forced correction shall be made when passing through walls or floors. When it is parallel to other pipelines, the protection distance shall be reserved according to the design requirements. When there is no requirement in the design, the net distance shall not be less than 100mm.

Avoid static electricity and impact during use.