How much pressure should an approved relief valve be set to relieve above system air pressure?

The correct level for setting an approved relief valve to relieve above system air pressure is 5 psi. This setting ensures that the relief valve activates before the system pressure reaches a level that could potentially cause damage or exceed safe operational limits.

The purpose of a relief valve is to protect water supply systems by preventing over-pressurization, which can lead to failures or leaks in pipes, as well as potential hazards. By setting the valve to relieve at 5 psi above the system's normal operating pressure, safety is maintained, and the system can efficiently vent excess air pressure without compromising integrity.

Understanding the operational pressure range is crucial for maintaining safety and functionality in sprinkler systems. Any higher setting for relief, such as 10 psi, 15 psi, or 20 psi could be risky, as it might allow the system pressure to reach unsafe levels before the relief mechanism engages, thereby increasing the likelihood of potential system failures.