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Relief valve set pressure on systems operating at more than 5 psig must be:

1) Less than 5 psig
2) Equal to 5 psig
3) Greater than 5 psig
4) Cannot be determined

Answer :

Final answer:

Relief valve set pressure for systems operating at more than 5 psig must be greater than 5 psig, ensuring safety by accounting for normal and excess pressures. Thus, option C is the correct answer.

Explanation:

The relief valve set pressure for systems operating at more than 5 psig must be greater than 5 psig. Thus, option C is the correct answer. Safety valves are an essential part of pressure relief systems in gas, steam, air, and liquid tanks to guard against excess pressure. The set pressure of a relief valve is critical to ensure safety and it needs to be high enough to handle normal system pressures while providing a margin for overpressure situations. For example, if the system fails at an operating pressure of 4 atm, the shutdown point should be set at a safer pressure, like approximately 3 atm, as determined by the plant's safety protocols.

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