LGTCO/LGTF Exit Exam • Set 2 Question 21 of 30

Why is water prohibited for extinguishing liquid gas jet fires at manifold valves unless flow is stopped first?

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Direct Answer

Option D: Extinguishing flame without stopping gas flow creates unignited gas cloud explosion hazard

Extinguishing a gas jet fire with water without first isolating the fuel source allows unburned flammable hydrocarbons to accumulate, forming a delayed-ignition vapor cloud prone to catastrophic unconfined vapor cloud explosions.

All Options

Water ruins paint

Water freezes gas

Water turns gas to oil

Extinguishing flame without stopping gas flow creates unignited gas cloud explosion hazard (Correct Answer)

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).

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More Questions in LGTCO/LGTF Set 2

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Q1 What is the role of Nitrogen padding in gas shipping? Q2 What instrument measures oxygen content in gas samples? Q3 What is the purpose of deck water spray curtains during gas leaks? Q4 Who oversees gas cargo watchkeeping and manifold transfers on board? Q5 How frequently must operational drills and practical checks for regulatory compliance and STCW code requirements be conducted for Advanced Liquefied Gas Operations? Q6 What documented record must be maintained on board following completion of tasks related to regulatory compliance and STCW code requirements in Advanced Liquefied Gas Operations? Q7 What is the primary component of LPG Commercial Propane? Q8 At atmospheric pressure, what is the boiling point of propane? Q9 What danger is posed by Nitrogen gas leaking into enclosed accommodation spaces? Q10 What type of insulation is used in Technigaz Mark III membrane LNG tanks?