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Q8. With reference to LNG diesel engine installations:

(a) Describe, with the aid of a sketch, a Gas Valve Unit, explaining its purpose and indicating where it is located in the gas train; (8)

(b)  Explain why ventilation and inert gas systems must be installed with the engine fuel gas system; (4)

(c)State why pilot injection must be provided when burning fuel gas, explaining how a pilot injection system operates. (4)