LGTCO/LGTF Exit Exam • Set 5 Question 16 of 30
State the typical thickness of the primary metal membrane in membrane LNG tanks:
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Direct Answer
Option B: 0.7 to 1.5 mm thick
Membrane containment systems (such as GTT Mark III corrugated stainless steel or NO 96 Invar alloy) use thin metal sheets ranging from 0.7 mm (Invar) to 1.2–1.5 mm (stainless steel).
All Options
A
2.0 to 3.7 mm thick
B
0.7 to 1.5 mm thick
(Correct Answer)
C
4.0 to 5.0 mm thick
D
8.5 to 10.0 mm thick
Detailed Explanation & Context
Membrane containment systems (such as GTT Mark III corrugated stainless steel or NO 96 Invar alloy) use thin metal sheets ranging from 0.7 mm (Invar) to 1.2–1.5 mm (stainless steel).
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).
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