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.
简单的凸缘卷边接合已被应用于类似的产品，GT避震口在生产过程中用四层结构进行凸缘卷边接合处理。
Simple Wulstumlage joint technology has been used in the similar products. GT flexible duct connector use four layers to join the Wulstumlage in its production process.
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