由于塔里木地区地理环境特殊，昼夜温差比较大，因面小呼吸损耗是固定顶罐油品蒸发损耗的主要原因。
The standing loss is the major cause for fixed-roof oil tanks due to the special geographical environment and great day-night temperature difference in Tarim area.
呼吸阀安装在固定顶罐的通风装置，起减少油品蒸发损耗，控制储罐压力的作用，它也可与阻火器联合安装使用。
Breathing Valve shall be set on roof of the fixed-roof tanks, which can make the tanks safe and reduce the loss of the stored liquids as evaporation.
根据国家标准《石油化工企业设计防火规范》（GB50160-92）之规定：“储存甲、乙类液体的固定顶罐，应设阻火器和呼吸阀”。
Flame Arrestor breather valve should be equipped on the top of tank for type A B liquid according to GB50160-92, "Fire prevention code of petrol chemical enterprise design".
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