Fig: Gas carrier Sigas Ettrick underway
During the initial period of vaporisation of the gas, ignition may be
accompanied by a flash of varying proportions.However, because the velocity
of propagation of a flame is lower in methane than in other hydro-carbon
gases, it is unlikely that future ignition will have flash effect.
The fire-fighting plan should be well thought out in advance and a
concentrated effort made rather than ‘hit and run’ tactics, as these will only
consume the vessel’s extinguishing facilities without extinguishing the fire.
Before attempting to tackle a large fire, you should seriously consider
allowing the fire to burn itself out.
expanding vapor explosion (BLEVE) is a phenomenon associated with uninsulated pressurized tanks, such as propane tanks. When the
uninsulated tank is subjected to an external fire,
pressure in the tank will rapidly rise and ultimately cause its rupture.
The insulation around LNG tanks is used to minimize the evaporation of LNG during ocean transit.
This insulation will also insulate the liquefied natural
gas cargo in the presence of an external fire and will
limit the rate of rise of the internal tank pressure. In
the event that some of the insulation is compromised, LNG tanks are equipped with pressure-relief
valves. Venting through these is designed to keep the
pressure within an acceptable range to prevent the
tank from exploding.
Should an attempt to extinguish the fire be made, extensive use of ‘dry
powder’ should be employed from as many dispensers as can be brought to
bear. Fire-fighters should be well protected against heat radiation and possible
flash burns, and approach the fire from an upwind direction. Power
dispensers should sweep the entire area of the fire, but direct pressure of
powder jets on to the surface of the liquid should be avoided.
Should dry powder guns be used, fire-fighters should be well practised
in their use and be prepared for some kick-back effect.They should also be
made aware that there is no cooling effect from the use of dry powder, and
that re-ignition after a fire has been extinguished is a distinct possibility.
In the initial stages it is always preferable to isolate the fire by shutting
off the source of fuel.This may not, however, always be possible.
A final warning when tackling an LNG fire is that water should not be
used directly, as this will accelerate vaporisation of the liquid.This is not to
say that surrounding bulkheads and decks cannot be cooled down with
water sprays, provided that water running off is not allowed to mix with
Liquefied gases - Health hazards
Safety equipment Liquefied gas cargo reactivity
Liquefied gas cargo corrosionLiquefied gas cargo vapour characteristicsLiquefied gas cargo - low temperature effectsLiquefied gas carrier -monitoring cargo pressure
- Guideline to tackle fire on board LNG ship
Training requirements LNG carriers
- Design characteristics of liquefied gas carriers
- Liquefied gas carrier -applicable regulations
- Vapour Characteristics of liquefied gases
- Personal protective equipments for people working onboard gas carriers
- Low temperature effects of Liquefied gases
- Reactivity of liquefied gas cargo and safety guideline
External links :
LionGas LNG terminal in Rotterdam
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