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GASCO Exit Exam • Set 1 Question 18 of 30

What is the purpose of the primary membrane in a Gaztransport membrane LNG containment system?

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Direct Answer

Option A: Liquid-tight barrier containing the cargo liquid

The primary membrane in a Gaztransport system acts as the liquid-tight barrier directly in contact with the cryogenic cargo. It is designed to accommodate thermal contraction and expansion while ensuring the structural integrity of the containment system, as required by the IGC Code for independent or membrane tanks.

All Options

A
Liquid-tight barrier containing the cargo liquid (Correct Answer)
B
Outer weather deck protection
C
Thermal insulation layer only
D
Structural hull stiffener

Detailed Explanation & Context

The primary membrane in a Gaztransport system acts as the liquid-tight barrier directly in contact with the cryogenic cargo. It is designed to accommodate thermal contraction and expansion while ensuring the structural integrity of the containment system, as required by the IGC Code for independent or membrane tanks.

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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