Answer :

Final answer:

The relief valve for a low-pressure hot water system should be set to 30 psig, which is a gauge pressure measurement relative to atmospheric pressure and suitable for safety without frequent discharge.

Explanation:

The relief valve for a low-pressure hot water system should be set at a pressure high enough to ensure safety but not too high as to frequently discharge under normal operating conditions. In this context, the correct answer is 30 psig, which stands for 30 pounds per square inch gauge. This value is a positive pressure relative to the ambient atmospheric pressure. It's important to distinguish between psia, which refers to pounds per square inch absolute and includes atmospheric pressure, and psig, which is relative to atmospheric pressure and is the more typical setting for such systems.

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