GASCO Exit Exam • Set 7 Question 21 of 30
For the LNG NO 96 containment system, why is the cargo tanks secondary insulation spaces pressure maintained slightly higher than primary insulation spaces?
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Direct Answer
Option A: To avoid vapor transfer into secondary insulation spaces if primary insulation spaces vapor leaks
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.
All Options
A
To avoid vapor transfer into secondary insulation spaces if primary insulation spaces vapor leaks
(Correct Answer)
B
To avoid cold spot formation in inner hull
C
To reduce heat transfer and increase efficiency of insulation spaces
D
To prevent ingress of air through the leak spot into cargo tank
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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