Exam Question
With reference to LNG bunkering procedure on board vessels fuelled with LNG fuel. Please explain the following processes:
(a) Gassing up,
(b) Cooling down,
(c) Vapour Management,
(d) Emergency release coupling procedure.
Class 1 (Chief Engineer)
Engineering Management
📅 Dec 2025
Reference Answer
### (a) Gassing Up
**Purpose:**
Gassing up is the process of replacing the inert gas (typically dry Nitrogen) or air within the LNG fuel tank and associated pipelines with natural gas (NG) vapour prior to the introduction of liquid LNG. This is a critical prerequisite for the cooling down and bunkering operations.
**Objectives and Procedure:**
**Purpose:**
Gassing up is the process of replacing the inert gas (typically dry Nitrogen) or air within the LNG fuel tank and associated pipelines with natural gas (NG) vapour prior to the introduction of liquid LNG. This is a critical prerequisite for the cooling down and bunkering operations.
**Objectives and Procedure:**
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play