It is pointed out that the plugging and freezing of breather valve, variation in parameters and operation conditions of oil tank and human factors result in the shrink of oil tank.

指出导致油罐抽瘪的主要原因是呼吸阀堵塞和冻结、油罐参数和工艺条件发生变化以及操作失误等。

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For deficiencies of its structure, the previous breather valve with fire protection is not suitable for installing on light oil storage tank at cold area.

原使用的轻质油储罐防火呼吸阀，由于结构缺陷，不宜使用于寒冷地区储油罐上。

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