What is the primary function of a pressure relief device in an ASME container?

The primary function of a pressure relief device in an ASME (American Society of Mechanical Engineers) container is to release excess pressure. This is critical for maintaining the safety and integrity of the container, especially when it comes to handling propane or other gases.

When the internal pressure of the container rises beyond a specified limit—due to factors like temperature increases or gas expansion—the pressure relief device automatically activates to vent excess pressure. This prevents the possibility of catastrophic failures such as explosions or ruptures, thereby protecting both equipment and personnel.

By ensuring that the pressure remains within safe limits, the pressure relief device plays an essential role in maintaining safety standards in propane gas handling and storage.