本标准的目的是建立一种统一的方法，用于测量内部浮顶上使用的机械连接甲板接缝的蒸发甲板接缝损失系数和甲板接缝损失系数 坦克。这些甲板接缝损失系数和甲板接缝损失系数应根据其在甲板接缝或甲板接缝规定压差下的损失率来确定，以进行认证。

The purpose of this standard is to establish a uniform method for measuring evaporative deck-seam loss factors and deck-joint loss factors of mechanically-joined deck seams that are used on internal floating-roof tanks. These deck-seam loss factors and deck-joint loss factors are to be determined in terms of their loss rate at specified pressure differences across the deck seam or deck joint for certification purposes.