What is the maximum working pressure of 3/4 in. PVC Schedule 80 pipe?

The maximum working pressure of 3/4 inch PVC Schedule 80 pipe is indeed 320 psi. This specification is derived from the standards set by organizations such as the American National Standards Institute (ANSI) and the American Society for Testing and Materials (ASTM), which provide guidelines and testing methods for various types of piping materials.

PVC Schedule 80 pipe is thicker than Schedule 40 pipe, which allows it to withstand higher pressures. The wall thickness contributes to the pipe's ability to manage stress under pressure, making it suitable for various applications that require higher pressure tolerance, such as industrial and chemical applications.

When evaluating different pipe schedules, it's important to refer to the manufacturer's specifications or relevant standards for accurate pressure ratings, as these can inform decisions regarding materials to use in plumbing systems. Understanding these specifications helps in selecting the right materials to ensure safety and functionality in plumbing designs.