A relief valve shall be set to relieve pressure at what psi?

The correct answer is that a relief valve should be set to relieve pressure at 175 psi. This pressure setting is typically established based on safety requirements and the maximum allowable working pressure of the system.

In a sprinkler system, maintaining the correct pressure is crucial to ensure proper functioning and to prevent damage to the system components. The 175 psi setting provides a balance between safety and functionality. It prevents excessive pressure from causing potential leaks or ruptures in pipes and fittings while also ensuring that the system can operate effectively under normal conditions.

It is important to note that different systems may have different specifications, but 175 psi is a commonly accepted standard that meets regulatory requirements for many types of fire protection systems. Understanding the rationale behind this pressure setting helps in ensuring safe operation and compliance with industry standards.