in the process of normal production, processing, disposition, transportation or storage in the petrochemical businesses, it is inevitable that the material will be spilled or leaked from the equipment, pipeline and storage tanks.As a consequence, the release resource emerges in the area of production device. When it is mixed in a ceratin propotion with the air, an explosive gas environment will be formed. The explosive mixture of gas under certain conditions will be ignited to cause an explosion, which forms damage to personel and engineering facilities. For this kind of risk, the appropriate measures must be taken.