The relief valve for a low pressure steam system should be set at:

In low pressure steam systems, the relief valve is a critical safety component designed to prevent overpressure conditions that could lead to system failures or catastrophic events. The correct setting for the relief valve generally aligns with standardized safety regulations for low pressure steam service, which typically define a maximum safe operating pressure.

Setting the relief valve at 15 PSIG is consistent with industry standards for low pressure steam systems, as this is typically considered the upper limit for safe operation. This provides a buffer to ensure that if pressure approaches or exceeds this threshold due to operational or unexpected conditions, the relief valve will open to mitigate the risk.

When the setting is too low, it might result in unnecessary cycling of the relief valve, leading to inefficiencies and possible strain on the system. Conversely, if set too high, it risks exceeding the design specifications of system components, increasing the potential for equipment damage and safety hazards. Therefore, 15 PSIG is established as a safe and effective pressure setting for the relief valve in such systems, balancing operational efficiency with safety precautions.