There are three kinds of carbon steel flange sealing surface type: planar sealing surface, suitable for the occasion of pressure is not high, medium non-toxic; Concave-convex sealing surface, suitable for pressure slightly higher occasion; Mortise sealing surface, suitable for flammable, explosive, toxic medium and high pressure situation. Ordinary rubber gasket is suitable for the occasion of temperature below 120 ℃; Asbestos rubber gasket suitable for vapor temperature below 450 ℃, the oil temperature is below 350 ℃, pressure is lower than 5 Mpa, for general corrosive medium, the most commonly used is acid-proof asbestos board. Carbon steel flange gasket is a kind of can produce plastic deformation, and has certain strength rings made of materials.
Stiffness requirements for carbon steel flange, flange design, strength calculation, only the few stiffness calculation, but more and more of the production practice has proved that may also affect the flange sealing flange stiffness, less rigid flange buckling deformation will produce too much, make the gasket stress is not uniform, and cause leakage. Carbon steel flange connection is a detachable connection. According to the connection of parts can be divided into the vessel flange and pipe carbon steel flange. In high voltage equipment and pipelines, using 10 copper, aluminum, steel, stainless steel type lens or other shaped metal gasket. High pressure washers and sealing surface contact width is very narrow (line contact), the sealing surface with gasket processing carbon steel flange finish higher.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)
