(2) The pressure test results of each system show that the pressure meets the design requirements and there is no leakage.
Pipes must be cleaned, and pipes and supports (piers) shall not be on frozen soil and rotten wood.
Pipes passing through roofs and floors shall be buried with sleeves and water-stop rings, and joints shall not be buried in walls or floors.
2. Slope of pipeline in foundation engineering (1)
The horizontal water supply pipe should have a drainage slope of 0.002 ~ 0.005 and should be uniform. The distance between the water meter and the wall is 10-30 mm, and the horizontal pipe and riser are along the wall, depending on the position of the water meter or faucet, and the height deviation of different outlets is less than10 mm.
Cold and hot water pipes connected in parallel should follow the principles of heating first and then cooling, left heating and right cooling, and internal heating and external cooling.
(2) Pipe interface (threaded connection)
The pipe thread accuracy meets the specification requirements, and there is no phenomenon of broken wire, biting thread and screwing thread, and the connection is firm, with 2-3 exposed roots (D
Above N80, 3-4 threads can be exposed, and galvanized pipes have no welded joints (except flanges to be welded).
Correct use of pipe fittings, galvanized pipes and pipe fittings are not damaged, exposed threads are well protected against corrosion, and there are no defects such as oil leakage and hemp.
If the spray pipe needs to be reduced in diameter, a reducing pipe fitting should be used instead of a casing. The joint of PP-R pipe should be fully welded without deformation.