Nominal pressure refers to the working pressure of the pipe to continuously deliver water at 20°C. If the water temperature is between 25°C and 45°C, the working pressure should be corrected according to different temperature drop coefficients. Working pressure refers to the maximum continuous movement pressure that acts on the inner wall of the pipe under normal working conditions, excluding the fluctuating pressure of water. The design pressure refers to the maximum instantaneous pressure that the piping system acts on the inner wall of the pipe. Generally, the sum of working pressure and residual water hammer pressure is used.
The relationship between the three:
nominal pressure ≥ working pressure
design pressure = 1.5 × working pressure
The working pressure is calculated by the hydraulic calculation of the pipe network.
