Flat welded ring flanges (PJ/SE)
Jul 19, 2018
Flat welded ring flanges are movable flanges, usually supporting the water and drainage fittings (the most common on expansion joints). When the factory comes out of the factory, there is a flange at both ends of the expansion joint. It is directly connected with the bolts of the pipe and equipment in the project. The purpose of using flat welded ring flanges is generally to save the material. Its structure is divided into two parts, the pipe part one head and the pipe connection, the one end and the flange part on the flanging. The flanges are made of low grade materials, while pipes are made of materials similar to pipes.
Flat welded ring flanges:
1, save the cost. When the pipe material is special and expensive, the cost of welding flange with the same material is high.
2, not easy to weld or not easy to process or require great strength. Such as plastic pipes, glass tubes, and so on.
3. It is convenient for construction. For example, flange bolt holes are not easy to locate when connecting, or prevent changing bolt holes of equipment flange in future.
The defects of flat welded ring flanges are:
1, the pressure is low.
2. The strength of the welding ring is low (especially under the thickness of 3mm).
Production standard for flat welded ring flanges:
National standard: GB/T9112-2000 (GB9113. 1-2000~GB9123? 4-2000)
American Standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)
Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)
German standard: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634 and 2545 (PL, SO, WN, BL, TH)
Ministry of chemical industry standards: HG5010-52~HG5028-58, HGJ44-91~HGJ65-91
Flange standard: HG20592-2009 (PN Series) \HG20615-2009 (Calss Series)
Machinery standards: JB81-59~JB86-59, JB/T74-1994, JB/T79-94~JB/T86-94
Pressure Vessel Standards: JB4700-2000~JB4707-2000, JB1157-82~JB1160-82 B16.47A/B B16.39 B16.48
