GASCO Exit Exam • Set 8 Question 10 of 30

During a long ballast passage which method of retaining heel onboard produces less boil-off?

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Direct Answer

Option D: Adequate heel is retained in all the tanks

Retaining a small heel of LNG cargo on ballast voyages maintains tank cryogenic temperatures, minimizes thermal shock, and avoids lengthy pre-cooling at the loading port.

All Options

Heel is retained in a center tank and sprayed in others

Heel is retained in alternate tanks

Heel is retained in 50% of the tanks

Adequate heel is retained in all the tanks (Correct Answer)

Detailed Explanation & Context

Retaining a small heel of LNG cargo on ballast voyages maintains tank cryogenic temperatures, minimizes thermal shock, and avoids lengthy pre-cooling at the loading port.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO).

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More Questions in GASCO Set 8

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Q1 Ethylene Carriers use, Q2 _____________is an operating problem that happens when the vapour moves over the liquid's surface rapidly and the liquid droplets get entrapped with the vapour. Q3 Zero gas which is a calibration gas is made of pure___________. Q4 Why is adequate heel retained during short ballast voyages? Q5 The main purpose of zero gas is the calibration of ______________ reading of gas detectors. Q6 Identify the industry body which is associated with LNG industry although its major stakeholders are from the oil industry? Q7 The unit of measurement of amount of gas is referred as_________. Q8 ________________ is the process of changing the mixture in the tank because of the evaporation of the volatile constituent at first. Q9 _______________refers to the vapour mixture which is weaker that lower explosive limit. Q10 After discharging the liquid from the cargo tank, a small quantity will be remaining and it will be difficult to pump it out. This small quantity of liquid is called as________________.