🔍 Key Concepts

• Tank stripping purpose and when it is done in cargo operations • Differences between centrifugal pumps and positive displacement pumps • How pump performance changes when suction head is low or when stripping near the tank bottom

💭 Think About

• Think about what happens to the pump’s effectiveness when there is very little liquid left in the tank—what type of pump can still move small amounts of liquid and sometimes air-liquid mixtures? • Which pump type maintains nearly constant flow regardless of pressure, and which type loses efficiency quickly as suction conditions worsen? • How are tanks usually stripped after the main cargo pump has already taken most of the cargo out?

✅ Before You Answer

• Identify which pump type is best at handling low suction head and small remaining volumes of liquid • Consider which options are actually pumping methods versus cargo handling procedures (e.g., load on top, water displacement) • Verify which pump type is commonly used as a stripping pump on tankers in standard tanker practice