Weld neck flange welded flange production standards: Because Vessel nominal diameter and nominal pipe diameter depending on the specific dimensions represent, therefore, the same nominal diameter of the vessel flange and pipe flanges, their size not the same, the two can not substitute each other. In addition to the type of pipe flange welding, butt welding flange, there are steel flanges, cast iron flanges, Looper flange, threaded flange. Except GB9119.7-88 standard pipe flanges, the common standards are: Ministry of Chemical Industry Standard HG20592 ~ HG20602-97; Sinopec standard SH3406-96 like. Ministry of Chemical Industry standards which are divided into the European system, the Inter-American system, and our common European system. Since the operating pressure is not high, small diameter, can be welded flange influenza, flat sealing surface, asbestos rubber sheet gasket material selection. Coupling bolts selection of materials for the Q235-A, the choice of 2 ", 4" flange. Flange material: carbon steel, mainly 20 # steel, Q235 material. Packing: fumigation wooden pallets can be according to customer requirements for special packaging. Product Quality: ISO9001: 2008 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health and safety management system, pressure pipe special equipment manufacturing license, the State Power Corporation, China National Petroleum Corporation a supply network members supply range flange : petroleum, power plants, chemical, gas, fire, water, sewage pipes, steel mills, shipyards. Price: As the product price changes frequently, you can through our website (Hebei Stone High Pressure Flange Pipe Fittings Co., Ltd.) quickly consult us. Hebei Stone High Pressure Flange Pipe Fittings Co., Ltd. production weld neck flange not only meet the standards, but also has been drawing processing or processed in accordance with customer demand. I produced the flange can ensure that material, provided the material alone.