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What do you understand by flash point of a fuel?
Explain the flash point testing procedure
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What is the flammability range of methane?
5 to 15% by volume
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What is water curtain?
Designed to prevent LNG from coming into direct contact with the ship's hull
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What is the fourth component of fire tetrahedron?
Molecular chain reaction
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What are the disadvantages of LNG?
Colourless, odourless, very less flashpoint.
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What is the minimum capacity of SCBA bottle as per SOLAS?
1200 ltrs
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What do you understand by LEL?
Lowest concentration of a gas or vapour that will burn in air.
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What are the contents of firemans outfit? What is the speciality of fireman suit used for LNG fires?
Fireman suit, scba, walkie-talkie, rescue line with belt etc. / Apron is cryogenic
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What is the disadvantage with the DCP extinguishers?
No cooling effect, danger of re-ignition & caking
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Who is the overall incharge while fighting the fire?
Master
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What are the names of the team organised during fire fighting drill?
Command team, Emergency team 1 & 2, Roving/technical team & Support/First aid team
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What is the propellant gas used for DCP?
Nitrogen
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Why are we using LNG as a fuel even though it is a greenhouse gas?
Once burnt, it is not a greenhouse gas
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What are the duties of technical/roving team during fire fighting?
Start emergency pump, ventilation & power isolation
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What is methane slip?
Methane escaping through exhaust and C/c vent
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What are the advantages of LNG?
Less emission, abundantly available
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In which of the places, LNG fire is most likely to happen onboard?
Bunker manifold, Pump glands, Pipe flanges & Relief valves
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Among smothering, starvation & cooling, which you think is the best method for extinguishing LNG fires?
Starvation
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Is methane a greenhouse gas?
Yes
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What are the duties of emergency team?
Wear firemans outfit, boundary cooling, fight the fire
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Which extinguishing medium is best for fighting LNG fire?
DCP
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What is Novec 1230?
Good extinguishing medium for gas fires as well as electrical fires.
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What are the duties of support team during fire fighting?
First aid, preparation of survival craft
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Can you hit LNG directly with water jet?
No
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What is the flash point of LNG?
-188 deg C
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What is the harmful effect of CO2?
Greenhouse effect & Global warming
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What is the fire triangle?
Heat, Fuel & Oxygen
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At what temperature LNG is being stored?
-163 deg c
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Why CO2 is not used as propellant gas for DCP
Due to moisture/caking effect
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Which chemical is used to prevent caking in DCP?
Magnesium Stearate
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What are the duties of command team?
Overall command, internal & external communication
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How many teams are there during fire fighting drill?
5
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