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液化石油气罐车在使用过程中会在罐底累积出一层主要成份是硫化亚铁的残渣。残渣表面能吸附大量的液化石油气残液。干燥的硫化亚铁裸露在空气中，易与氧气起系列化学反应，放出大量的热，能产生自燃现象，会引起火灾与爆炸。大、中修罐车时，对罐内进行清水浸泡置换与蒸汽煮洗后，还必须将残渣清除干净，经监测鉴定安全后，方可打磨、动火维修。
Liquefied petroleum gas tank car in the process of accumulation in the tank bottom layer of the main ingredient is the residue of ferrous sulfide. The residue surface can absorb a lot of liquefied petroleum gas residue. Dry ferrous sulfide exposed in the air, easy and oxygen from a series of chemical reactions, release a lot of heat, can produce spontaneous combustion, can cause fire and explosion. Large and medium tanker repair, the tank for water immersion replacement and steam boil, you must also remove the residue clean, after monitoring the identification of safety before grinding, moving fire repair.