The Most Common Flange Types

 The use of different types of flanges for different purposes is vital.

Standard types of flanges: these flanges are used for piping applications, which mainly depend on the required strength for the flanged joint. These types of flanges are basically used for welding connections, and to facilitate maintenance operations.




a)    Blind flanges:  Unlike all the types of flanges mentioned above, this flange type does not have a center hole. Stainless Steel Blind Flanges are mostly used to seal the end or opening of a pipe. These are used to blind or seal a pipeline, a valve/pressure vessel and block the flow of the fluid. Blind flanges allow easy access to the pipelines, because they can be easily unbolted to let the operator execute activities inside the terminal end of the pipe.

b)   Slip on flanges: This type of a flange is connected to the pipe or fittings by two fillet welds, from which one is executed outside and one is executed inside the flange. These are easy to recognize because of their slim and compact shape.

c)     Threaded flanges: These flanges are joined to pipes by screwing the pipe onto the flange, without seam welds. They are mostly used in small size piping in low pressure and low temperature, for example water and air utility services.

d)   Socket weld flanges: These are connected to pipes using a single fillet weld executed on the outer side of the flange. These are used for small size and high pressure piping that do not transfer highly corrosive fluids.

e)    Lap joint flanges: With a flat face, these flanges are used in conjunction with a stub end. The use of these flanges along with stub ends is a cost effective solution for stainless steel and nickel alloy pipelines.

Long welding neck: These are similar to welding neck flanges. The only exception is that the neck of this type of flange is extended. These flanges are used on vessels, columns or barrels. 

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