Loose flange plate with flat welding ring is a movable flange, which is generally matched on the water supply and drainage fittings (the most common expansion joint). When the manufacturer leaves the factory, there is a flange at both ends of the expansion joint, which is directly connected with the pipeline and equipment in the project with bolts. The purpose of using loose flange plate with flat welding ring is generally to save materials. Its structure is divided into two parts: one end of the pipe is connected with the pipe, the other end is made into a flanging, and the flange plate part is sleeved on the flanging. The flange plate is made of low-grade materials, while the pipe part is made of the same materials as the pipe to save materials

Advantages of slip on welding ring loose flange:

1. Cost savings. When the pipe material is special and expensive, the cost of welding flanges of the same material is high.

2. It is not convenient for welding or processing or requires high strength. Such as plastic pipe, glass steel pipe, etc.

3. It is convenient for construction. For example, it is not easy to align the flange bolt holes when connecting or prevent the flange bolt holes from changing when replacing equipment in the future.

Disadvantages of slip on welding ring loose flange:

1. Low stress.

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