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Tongue and groove flange is one of the types of flange,the materials of it are carbon steel or stainless steel,also the facing method of it are rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or colored electroplate, powder coating and so on.Moreover,the design of the flange is no different if it is tongue and groove or raised face except for the dimensioning of the tongue and groove.When setting up the design, you must select the gasket dimensions and the bolt circle to provide sufficient clearance for the tongue and groove.Just add the tongue height to the calculated flange thickness and the same for the groove depth. Moreover,the materials of Tongue and groove flangeinclude carbon steel, alloy steel, stainless steel.Also the facing method of it are rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or colored electroplate, powder coating and so on.The techniques of it are forged.Besides,the connection type of it are raised face, flat face, ring type joint, lap-joint face, large male-female, large tongue and groove, small tongue and groove. Furthermore,the usage of Tongue and groove flange are in connecting pipe line and keep its leakproofness; convenient for replacing pipe line; easy to separate and check the situation of pipe line; easy to seal pipe line.Then the application area of it are mainly oil, chemical industry, nuclear power station, food manufacturing, construction, shipbuilding, paper making, medicine and other industries.