🔍 Key Concepts

• Modern tanker cargo pump design and location in separate pumprooms • How different types of shaft sealing arrangements control leakage (mechanical seals vs stuffing boxes vs slinger rings) • Safety and pollution-prevention requirements for minimizing oil leakage in pumprooms

💭 Think About

• Think about which device is specifically designed to form a tight, adjustable or automatic seal on a rotating shaft to keep liquid from leaking out • Consider which options are mainly for reducing wear on the shaft or diverting small amounts of leakage rather than actually sealing it off • Ask yourself: on a modern tanker, which system would classification societies and pollution-prevention rules favor to keep oily vapors and liquids inside the pump casing?

✅ Before You Answer

• Identify which choice is a true primary sealing device on a rotating pump shaft • Distinguish between components that protect the shaft vs components that seal the cargo • Eliminate any option that mainly just catches or deflects leakage instead of preventing it at the seal point