What is the function of flange?

　　The ASTM A182 150LBS 12 Inch Blind Flange link consists of a pair of blind flanges, a gasket and several bolts and nuts. The gasket is placed between the two blind flange sealing surfaces. After the nut is tightened, the specific pressure on the gasket surface reaches a certain value, which causes deformation, and fills up the uneven parts on the sealing surface, so that the connection is tight. Blind Flange link is a detachable link. According to the linked parts, it can be divided into vessel blind flange and pipe flange. According to the structural type, there are integral flange, looper flange and threaded flange.

　　The common integral flange includes flat welding flange and butt welding flange. The flat welding flange has poor rigidity and is suitable for the occasion with pressure P ≤ 4MPa; the butt welding flange, also known as high neck flange, has high rigidity and is suitable for the occasion with high pressure and temperature. There are three types of flange sealing surface: plane sealing surface, which is suitable for the occasion of low pressure and non-toxic medium; concave convex sealing surface, which is suitable for the occasion of slightly high pressure; tenon groove sealing surface, which is suitable for the occasion of flammable, explosive, toxic medium and high pressure.