National Standard Flange Connection

Another layer of national standard flange means: according to the national standard requirements of the size, tolerance range, etc. production of the flange, different from the flange is not according to the standard size of the production of the flange is also known as the second standard flange (some people call non-standard flange is incorrect), usually some unscrupulous businessmen will reduce the thickness of the flange, the outside diameter of the two dimensions to achieve the purpose of saving materials, and the use of scrap steel or steel processing flange of the edge, usually this steel is the chemical composition and mechanical properties of substandard waste. Is the chemical composition and mechanical properties do not meet the standards of the waste, and even more black steel mills with private steel production flange, this private steelmaking steel refining technology used in the old can not guarantee the mechanical properties and welding performance, the use of the steel may not be able to weld with the steel pipe, or the steel itself has cracks, pores, etc. Welded on the leakage will also be.

So buy flange try to choose the national standard flange. If funds are limited to choose the second standard flange must be carefully observed and measure the flange size and test its material to avoid being fooled.

National standard flange (flange) connection is the two pipelines, pipe fittings or equipment, each fixed in a flange, between the two flanges, plus flange gasket, bolted together to complete the connection. Some pipe fittings and equipment has its own flange, also belongs to the flange connection. Flange connection is an important connection for pipeline construction.

Flange connection is easy to use and can withstand greater pressure. In industrial piping, flange connections are widely used. Within the home, the pipe diameter is small and low pressure, invisible flange connection. If in a boiler room or production site, there are flange connection pipes and equipment everywhere.

According to the connection method flange connection types can be divided into: plate flat welding flange, necked flat welding flange, necked butt-welding flange, socket welding flange, threaded flange, flange cover, necked butt-welding ring loose-set flange, flat welding ring loose-set flange, ring groove surface flange and flange cover, large diameter flat plate flange, large diameter high-necked flange, eight blind, butt-welding ring loose-set flange and so on.