What is a socket welding flange (SW flange)?
Socket welding flange,a popular type of pipe flange.It is like a slip on flange and used specially for small sizes piping systems.The shape of a socket welding flange is like a slip on flange with a block in the inner bore of the flange which name is socket.And the socket thickness is common same with the pipe thickness.However,the internal pocket of a socket weld flange allows for a smooth bore and better fluid flow.When provided with an internal weld,the static strength of this flange is equal to slip-on flange,but the fatigue strength is 50% greater than double welding slip-on flanges.
Smooth bore conditions in such a flange can easily be attained without having to bevel the flange face and,after welding,to reface the socket weld flange as would be required with slip-on flanges.For this reason,the internally welded flange is popular in chemical process piping.
The main features of the socket welding flange are as follows:
The recess on the inside diameter of the socket weld flange allows for a good fit of the pipe allowing for a smooth flow of liquid.
Socket welding flanges work well for smaller sizes and higher pressure temperature conditions.
They are similar to slip-on flanges,but must specify the schedule of the pipe where they will be used for with socket welds.
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