运输前拧紧所有密封件，盖好阀门挡板。
Tight all closures and put the valve cover door on position before shipment.
用活动金属挡板及水封井附加控制阀门封闭油罐组排水沟的方法既不可靠又会使流淌火面积扩大。
The method using movable metal baffle and control valve near water sealed well to block the drain of oil tank group is unreliable and it will widen flowing fire area.
挡板阀门(22)可以用作另一密封件。
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