タンカー用FRP製耐火救命艇の耐火断熱性能について

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The International Convention for the Safety of Life at Sea encourages all the participants to undertake research work on tanker lifeboats which could be capable of resisting fire when attached to davits, and of being safely lowered with their full complement and then cleared from the ship's side in conditions of fire on the surface of the water. Much cooling water which flows on the outer surface of a boat will be able to protect the FRP lifeboat from fire. But it is very difficult to cover all the outer surfaces of the boat with limited quantity of water, at any time when the boat is lowering or running against the wind. Therefore, the extent of damage and effectiveness of heat insulation of the FRP lifeboat, which is not substantially fireproof, must be investigated. Two kinds of heating tests, tension tests of heated plates and sprinkling tests of real tanker lifeboats are conducted as follows: a) FRP plates of 750×990(mm) which were the same materials as those of FRP tanker lifeboats were set vertically in front of a test furnace of about 500℃. And the plates were heated for twenty minutes while cooling water flows on the heating surfaces of the plates. b) Four runs of large scale oil fire tests were conducted with two kinds of half-size models of FRP tanker lifeboats. c) Tension tests were conducted to know the extent of decrease of tensile strength infected with the heat addition to the FRP plates. d) Water film thicknesses on the outer surfaces of shells were measured for two kinds of real tanker lifeboats. The main results obtained are summarized as follows: 1) The materials of FRP tanker lifeboats, which are composed of self-extinguishing and fire-retardant additions, can resist an oil fire of 1000℃ for about thirty seconds, even if there is no cooling water on the outer surfaces of shell plates. 2) 0.6mm is the necessary minimum water film thickness on the outer surface plate of thickness of 6mm to protect the boat and crews inboard for five minutes in conditions of fire on the surface of the water. In these conditions, the temperatures and the heat fluxes of the boat will not exceed the following values. i) Inner surface temperature of shell plate : 150℃ ii) Inboard air temperature : 60℃ iii) Heat flux into the outer surface of shell plate : 4500Kcal/m^2・h iv) Heat flux into the inboard air : 300Kcal/m^2・h
独立行政法人海上技術安全研究所の論文
1979-05-31

タンカー用FRP製耐火救命艇の耐火断熱性能について

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