🔍 Key Concepts

• Purpose of a relief valve in a cargo pump system • Where excess pressure or liquid should safely go in a closed piping system • Difference between suction side and discharge side of a pump

💭 Think About

• Ask yourself: When a relief valve opens on a cargo pump, where must the liquid be returned or discharged so that it does NOT create more overpressure or a safety hazard? • Which of these options would allow the pump to continue operating without damaging itself while safely handling the excess pressure? • Think about normal design practice on cargo systems: do we usually vent pumped cargo directly to atmosphere, or do we keep it in a closed loop?

✅ Before You Answer

• Verify which option keeps the cargo contained in the system rather than releasing it externally. • Check which choice is located where pressure is lower and the pump can safely recirculate flow. • Eliminate any option that would obviously create a pollution, vapor, or fire hazard by exposing cargo to atmosphere.