🔍 Key Concepts

• Boil-off gas (BOG) management on LNG carriers • Normal practice for cargo tank pressure control at anchor • Typical use of boilers, compressors, and reliquefaction/thermal systems on LNG ships

💭 Think About

• Think about what usually happens to boil-off gas when an LNG carrier is at anchor and not making full power on the main engine. • Ask yourself which option best reflects a normal, continuous method of controlling cargo tank pressure, rather than an emergency or last-resort action. • Consider which listed system is designed primarily for pressure and vapor management in LNG cargo tanks, not just for steam control or general ship power.

✅ Before You Answer

• Which choice actually mentions controlling cargo tank vapor/pressure rather than just handling steam or exhaust heat? • Is routine venting to atmosphere acceptable for LNG cargo operations, or is that tightly restricted? • Identify which system name (boilers, high duty gas compressor, steam dump, thermo‑regenerative plant) is most directly associated in LNG practice with boil-off gas handling and tank pressure control.