GASCO Exit Exam • Set 7 Question 24 of 30
Onboard an LNG tanker with NO 96 containment system, what will happen if a minor membrane leak (crack) occurs above the cargo level?
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Direct Answer
Option B: Direct vapor flow rate into the insulation spaces via the crack changes with cargo tank's pressure
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.
All Options
A
Small flow of liquid into the crack will vaporize. cargo tank pressuree will remain the same.
B
Direct vapor flow rate into the insulation spaces via the crack changes with cargo tank's pressure
(Correct Answer)
C
Cargo pressuree will be tremendously increased boil-off Gas will be out of control
D
Leak will become bigger and primary membranee will collapse inwards
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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