This paper presents the useful experimental results of the self-ignition temperature on no existence of the ignition source with regard to heavy fuel oil used mainly for the marine diesel engine. We compare these results with ones of gas oil and marine diesel oil. The ignition temperature of inflammable material is not a constant value. It depends on the characteristics of inflammable material, the mixing ratio with air, the surrounding air pressure, the shape and dimension of a heating body, a measuring apparatus and the method. The purpose of this study is to confirm the self ignition temperature of heavy fuel oil at the atmospheric pressure, dropping oil on the surface of the heat insulator. As a result, it became clear that the boundary temperatures of self-ignite region and not self-ignite region for heavy fuel oils was higher than gas oil and marine diesel oil.
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