Why is it necessary to consider the working pressure rating (WPR) of a plastic piping system, instead of just considering the pressure class (PC) of the pipe?
Actually, you should make this evaluation regardless of the pipe material being considered. Steady state pressure (no flow or constant velocity) within a pipe induces a stress in the pipe wall. The measure of a pipes ability to be pressurized is its’ pressure class. However changes in flow velocities introduce additional stresses in the pipe wall. The physical characteristics of a pipe material play a significant role in determining the magnitude and frequency of this induced surge or water hammer stress. Pipe made of stiffer materials experience much higher surge stress levels and more frequent stress changes, while often having ales ability to tolerate surge and fatigues’ tresses.
Related Questions
- Why is it necessary to consider the working pressure rating (WPR) of a plastic piping system, instead of just considering the pressure class (PC) of the pipe?
- What is the difference between a fitting a piping system and a pressure vessel? How does it affect how it is registered?
- Why is there a difference in pressure class (PC) and working pressure rating (WPR) between HDPE pipe and PVC pipe?
