During the ballast voyage, how are the tanks...

Question 1 / 2707066636ee728f7522a1c517557

Question 1 of 2707066636ee728f7522a1c517557

During the ballast voyage, how are the tanks kept cold on an LNG tanker?

Question 1 of 27070

During the ballast voyage, how are the tanks kept cold on an LNG tanker?

🔍 Key Concepts

• How LNG (Liquefied Natural Gas) is kept cold (refrigerated) in cargo tanks • The purpose and use of an LNG heel during ballast voyages • Difference between pressure control and direct cooling of the tank structure

💭 Think About

• Ask yourself: during ballast (no cargo loaded), what source of cold medium is still available on board to absorb heat entering the tanks? • Consider how LNG tanks stay at cryogenic temperature: is it mainly by changing pressure, by removing gas, or by circulating cold liquid? • Which option actually cools the tank walls and internal structure, not just the vapor above the liquid?

✅ Before You Answer

• Identify which choice involves circulating or using cold liquid LNG rather than just handling vapor or pressure • Verify which methods would waste cargo or be unsafe/uneconomic in normal operations • Check which option is commonly used to maintain low temperature of tanks between loaded voyages using a small remaining cargo (heel)

Question 1 of 27070

During the ballast voyage, how are the tanks kept cold on an LNG tanker?

aggressive gas compressor operation

venting gas to the atmosphere

managing the tank pressure

spraying LNG heel through spray nozzles in the tanks