With reference to membrane tanks for the carriage of liquefied gas at very low temperatures:
(a) Describe with a sketch one method of building up the insulation.
(6)
(b) State which alloy is used for the membrane and the reason;
(5)
(c) Explain why a secondary barrier is installed.
(5)
Reference Answer
### (a) Insulation Build-up for Membrane Tanks (Gaz Transport No. 96 System) A common and effective method for building up the insulation and containment system for a membrane tank is the Gaz Transport No. 96 (GT96) system. The construction is a layered system built up from the ship's inner hull plating inwards towards the cargo. **Layer-by-Layer Construction:** 1. **Inner Hull Structure:** This is the double hull of the ship, which provides the primary structural support for the entire containment system.
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