封闭装置凸缘可用机械方法或焊接方法洽当接合。除非封闭装置本身是防漏的，否则必须使用垫圈或其他密封件。

Closure flanges may be mechanically seamed or welded in place. Gaskets or other sealing elements shall be used with closures, unless the closure is inherently leak proof.

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凸缘埋头垫圈和支撑垫圈的整体高度比后备垫圈高，所以埋头部分要深些。

Flange cup Washers generally have a greater overall height than Back up Washers and therefore the cup portion is deeper.

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