What is the purpose of the relief valve of a cargo pump?

Correct Answer: Option B — Permits the return of cargo to the suction side of the pump

A cargo pump relief valve is designed to protect the pump and piping from over-pressurization. If the discharge valve is closed while the pump is running, the relief valve opens to recirculate the cargo back to the suction side, preventing mechanical damage or pipe bursts from excessive pressure buildup.