Flat welding ring loose sleeve flange

The flat welding ring loose flange is a movable flange, which is usually used on water supply and drainage accessories (the most common on expansion joints). When the factory leaves the factory, there is a flange on each end of the expansion joint, which is directly connected with the project. The pipes and equipment are connected by bolts. The purpose of using a flat welding ring loose sleeve flange is generally to save material. Its structure is divided into two parts, one end of the pipe part is connected to the pipe, one end is made into a flange, and the flange part is sleeved on the flange. The flange is made of low-grade materials, and the pipe part is made of the same material as the pipe, which saves material.

Flat welding ring loose sleeve flange:

1. Save costs. When the pipe material is special and expensive, welding the flange of the same material is costly.

2. It is not easy to weld or not easy to process or requires high strength. Such as plastic pipes, glass steel pipes and the like.

3. Easy to construct. For example, it is not easy to align the flange bolt holes when connecting or prevent the flange bolt holes of the equipment from being changed in the future.

Disadvantages of flat welding ring loose sleeve flange:

1. Low pressure.

2. Low strength at the welding ring (especially when the thickness is less than 3mm)

Flat welding ring loose flange production standards:

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, 2545 (PL, SO, WN, BL, TH)

Standards of the Ministry of Chemical Industry: HG5010-52 ～ HG5028-58, HGJ44-91 ～ HGJ65-91

Flange standard: HG20592-2009 (PN series) \ HG20615-2009 (Calss series)

Machinery department standards: JB81-59 ～ JB86-59, JB / T74-1994, JB / T79-94 ～ JB / T86-94

Pressure vessel standards: NB / T47020-2012 ～ NB / T47027-2012, JB1157-82 ～ JB1160-82 B16.47A / B B16.39 B16.48