Since 1996, the authors have systematically studied the ignition temperatures of diesel fuel oil, fuel oil A (MDF), fuel oil C (MFO), internal-combustion engine oil and turbine oil. The experimental apparatus consists of a gas burner and an exhaust gas pipe wound with asbestos. Sample oil was dropped on the surface of the heated exhaust gas pipe, and it was examined whether the sample oil ignited or not. The lowest temperature of the insulator surface at which the oil ignited was recorded as the ignition temperature. It was found that the ignition temperature was influenced by the drop amount and the surface conditions. Since asbestos could no longer be used, a new experimental apparatus without asbestos insulators was made. The results obtained from both apparatus were compared, and the validity of the new experimental apparatus was verified.
