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目前在全国商业油库中,接卸汽油均采用上卸法。即利用安装在装卸油台上,距钢轨顶面4.7米左右的鹤管或胶管插入罐车,再开泵抽卸,送入储罐。这种办法对于温度低于30℃、大气压在10米水柱的条件下,接卸各种轻油是可行的。但对于在35～40℃的汽油来讲,卸油作业中经常出现鹤管最高点的“汽阻”现象,使卸油中断。为了解决这个问题,各库在高温季节大都采用了简单的降温和利用真空泵抽汽油的措施,但效果很不理想。
Currently in the national commercial depot, take off and load petrol are used on the unloading method. That is installed on the loading and unloading of oil from the station, about 4.7 meters from the rail top of the crane pipe or hose into the tanker, and then pump pumping, into the tank. This approach for the temperature below 30 ℃, atmospheric pressure at 10 meters of water under the conditions of access to a variety of light oil is feasible. However, for gasoline at 35-40 ° C, the phenomenon of “vapor barrier” at the highest point of crane pipe often occurs in the unloading operation, which interrupts unloading of oil. In order to solve this problem, most reservoirs used the simple method of cooling and using vacuum pumps to pump gasoline during the hot season, but the results were not satisfactory.