(1) The pressure shown in the PVC water supply pipeline is expressed as the nominal pressure, expressed in Mpa, and 1Mpa≈10kgf/cm2 is the working pressure of the conveying medium under the condition of 20 °C. However, as the temperature of the medium increases (the medium > 50°C shall not be transported) the working pressure decreases, which objectively requires a sufficient pressure safety factor when selecting the water supply pipeline.
(2) The nominal pressure of water supply pipes is stipulated as: 0.6Mpa, 0.8Mpa, 1.0Mpa, 1.25Mpa, 1.6Mpa and other 5 kinds.
(3) The nominal pressure of pipes of the same specification is generally divided by the wall thickness of the pipes.
(4) The minimum diameter of pipes in each pressure zone is specified as follows: the minimum diameter of 0.6Mpa pipe is 63mm, the minimum diameter of 0.8Mpa pipe is 50mm, the minimum diameter of 1.0Mpa pipe is 40mm, and the minimum diameter of 1.25Mpa pipe is 32mm , The minimum diameter of 1.6Mpa pipe is 20mm and 25mm.
(5) The nominal pressure of water supply pipes is generally 1.6Mpa, and it is matched with pipes of various pressures.