loose flange, also known as looper flange, is to use flanges, steel rings, etc. to cover the flange on the end of the pipe, the flange can move on the end of the pipe. Steel rings or flanges are sealing surfaces, and flanges are used to compress them. It can be seen that the loose flange is not in contact with the medium because it is blocked by the steel ring or flanging.
Loose flange is suitable for the connection of non-ferrous metals such as steel, aluminium and stainless acid-resistant steel containers and corrosion-resistant pipelines.
Loose flange is movable flange, which is usually matched with water supply and drainage fittings. When the manufacturer leaves the factory, there is one flange at each end of the expansion joint, which is directly connected with the bolts used in the pipeline and equipment in the project.