On a LNG ship at anchor with cargo onboard,...

Question 1 / 270705eccef9dbacbc34ba4d45d2d

Question 1 of 270705eccef9dbacbc34ba4d45d2d

On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?

Question 1 of 27070

On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?

🔍 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.

Question 1 of 27070

On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?

Excess vapor is vented to the atmosphere.

The vapor is compressed by the high duty gas compressor and returned to the tanks.

All boil-off vapor is normally burned in the boilers, and any excess steam generated is controlled by the "steam dump system".

Excess vapor is controlled by the "Thermo-regenerative saturation plant".

Question 1 / 270705eccef9dbacbc34ba4d45d2d

Question 1 of 270705eccef9dbacbc34ba4d45d2d

On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?

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Question 1 of 27070

On a LNG ship at anchor with cargo onboard, how is the vapor pressure in the cargo tanks controlled?