The pipeline flange according to may divide into five fundamental types with the joint of pipe pipe joint way: The flat welding flange, the butt welding flange, the threaded flange, receive insert weldert weld rt weld the flange, a pine set of flange. The flange packing surface pattern has many kinds, generally has the convex commonly used (RF), the concave (FM), the concave-convex surface (MFM), the key way surface (TG), the entire ane (FF), the link joint face (RJ).
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ANSI B16.5 welding neck flange