The sealing failure of the manhole flange sealing joint is mainly manifested in leakage. In pipeline systems and devices in various industries, the sealing failure of flange joints can cause a lot of waste of energy and raw materials. If it is more serious, it will lead to scrapped equipment, shutdown of production, casualties and serious environmental pollution.

Therefore, modern petroleum, chemical, petrochemical, atomic energy, aerospace and other industries have put forward higher requirements for the sealing of pipeline devices. Flange joint is a kind of detachable connector, and it is also a product with high sealing requirements. The key is in the sealing material, the quality of the sealing material is directly related to the sealing quality of the flange product. It can be said that although the gasket is small, it is related to the problem of the sealing failure of the flange.

Generally, the manhole flange has a relatively large bearing weight, and it is generally not easy to deform during engineering. The key is the thickness. The inner and outer diameters of the manhole flanges are not a problem on the production side. The most difficult thing to process is their thickness. If the manhole flange is too thin, it will be easily deformed. Of course, there will be no deformation problem during the production process, and it will not occur when it is processed by the machine tool, but it is dangerous during use.

The manhole flange is cut into slats with a medium plate, and then rolled into a circle. Reprocessing water lines, bolt holes, etc. This is generally a manhole flange, and the maximum can be 7 meters. Such flanges have a very good quality guarantee. Because the raw material is medium board, the density is good. Materials are carbon steel, stainless steel, alloy steel, etc.

Features of manhole flange production process: The products of manhole flanges are all welded products without threads. There are three types of manhole flange production processes: forging, rolling and splicing. First cut the middle plate into suitable slivers, the length of the sliver is determined according to the specifications of the large flange. Then use a ring rolling machine to make a circle, and use a welding rod to weld the joint firmly, and X-ray spectrum inspection should be carried out at the welding joint. Then use a press to flatten it, and then use a lathe to process water lines, chamfering and other processes, and finally use an indexing plate to cooperate with a drilling machine to drill the bolt holes.