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水下焊割工作开始前,必须清除被焊割结构内部的易燃易爆物质,因为即使这类物质在水下若干年,仍会一触即发,引起爆炸。 水下气割是利用氢或石油气与氧燃烧火焰进行的。由于在水下气割操作一般很难调整燃烧剂含量比,往往有未完全燃烧的剩余气体逸出水面,如遇阻碍则会积留在金属结构内,形成达到爆炸极限浓度的气穴。因此,应慎重考虑切割位置,最好先从距离水面最近点着手,然后逐渐加大深度,这样可以避免火焰经过未燃气体可能聚集处而引起爆炸的危险。水面上和水下人员在任何时刻都要注意防止液体和气体燃料的泄漏在水面聚集。
Prior to the start of underwater welding and cutting, flammable and explosive materials inside the structure to be welded must be removed, since even if these substances are underwater for several years, they will be triggered by a sudden trigger and cause an explosion. Underwater gas cutting is the use of hydrogen or LPG and oxygen combustion flame. Since it is generally difficult to adjust the fuel-to-fuel ratio during subsea gas cutting operations, residual gases that are not fully combusted tend to escape from the water surface and, in the event of obstruction, accumulate in the metal structure to form cavitation that reaches the ultimate concentration of the explosion. Therefore, we should carefully consider the cutting position, it is best to start from the nearest point of the water, and then gradually increase the depth, so you can avoid the flame through the unburned gas may cause the danger of explosion. At any time, water and gas personnel are advised to prevent liquid and gaseous fuel leaks from accumulating on the surface of the water.