Difference between long weld neck flange and integral flange

　　The long weld neck Flange and the integral flange is welded by butt welding, each has a long neck. How to distinguish the long weld neck flange from the integral flange in appearance, size and use? From the appearance point of view, the whole flange pipe end is thicker than long weld neck flange end, and the internal diameter of the whole flange is the same as the nominal diameter except ANSI Carbon Steel Long Weld Neck Flange.

　　The height of the integral flange is higher, and the thickness of the wall is thicker, which can be clearly seen by the flange reference standard. In application, the integral flange is a flange attached to the equipment, such as a flange on the valve, which is integral to the valve, not welded. The whole flange is mostly used in the manufacture of equipment, and it is hardly used in piping design. The long weld neck flange is used when connecting with valves, pumps and other equipment. It is welded to the pipeline, and the dimension of the tail joint is the same as the outer diameter and wall thickness of the corresponding pipeline/parts, so it can be directly butt welded.