Selection of gasket

Widely used in the gasket pipes, pressure vessels and various body joint surface static seal . There are non-metallic gaskets gaskets , non-metallic gaskets and metal combination and metal gasket three categories. The commonly used materials are rubber, leather , asbestos nylon zip ties, cork , PTFE , steel, iron, copper and stainless steel .
 
Gasket leaks in three forms : the interface leakage, infiltration leaks and destructive leak. Where previously the two as the main form .
Gasket selection :
Gasket selection principle is that, for less demanding situations, can be empirically selected sub- city again when replaced. But for those demanding applications such as explosive, toxic and combustible gases and highly corrosive liquids equipment, reaction tank and pipeline systems, etc. , should be based on operating pressure , operating temperature, sealed.
Flange surface roughness . The surface roughness of the sealing flange great effect , especially when using non- flexible gasket , the sealing surface roughness is caused by leakage of a large value of the main. For example , turning the blade flange is a spiral line pattern , using the metal gasket , if the roughness is large, it can not block the knife profile gasket is formed of spiral grooves which , under pressure , the media will along this trench leaked . Soft gasket to the flange surface finish is required is much lower, this is because it is easily deformed , fixed length plastic strap seal to block the machining tool pattern, thereby preventing leakage. Right soft gasket and flange surface is too smooth detriment .