GASCO Exit Exam • Set 15 Question 3 of 30

For the membrane class LNG carrier, during drying operation what is the recommended differential pressure between primary insulation space and cargo tank?

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Direct Answer

Option B: tank pressuree > IS pressuree +10mbar

In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

All Options

tank pressuree< IS pressuree +10mbar

tank pressuree > IS pressuree +10mbar (Correct Answer)

any pressuree can be maintained

tank pressuree = IS pressuree +10mbar

Detailed Explanation & Context

In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

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 15

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Q1 How is the cool down of cargo tanks done? Q2 What is the normal in service operating pressure difference between the primary and secondary insulation spaces? Q3 For the membrane class LNG carrier, during drying operation what is the recommended differential pressure between primary insulation space and cargo tank? Q4 On an lng tanker, during discharging why should stripping pumps be started at a minimum of 0.5m? Q5 On an lng tanker, during discharging which of the following is not a reason for opening the cargo discharge valve to about 10-20% before starting of cargo pump? Q6 Why is energy transfer calculated during lng cargo transfer and not just volume of transfer? Q7 Onboard lng carrier, what is the maximum allowable filling limit as per the IMO/ IGC regulation? Q8 Onboard a LNG tanker, with NO 96 containment system, which valves are used to maintain the pressure within the primary and secondary insulation spaces? Q9 On an lng tanker, during discharging which of the following is not required to ensure the optimum performance of a main cargo pump? Q10 On an lng tanker why do we need to maintain vapor arm connected to shore even after completion of discharging until just before sailing?