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A182 SS316L Stainless Steel SW Union

What is a SW Union and what about its specification and usage.

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What is a socket Weld Union

Socket weld unions are used as a permanent, welded connection between two pipes or piping systems. HART can manufacture standard and customized socket weld unions specified to S10, S40, S80, S160, and XXH welding schedules in Class 3000 and Class 6000 applications. Socketweld Unions come with ASME B16. 11 and B36.

Specification of SW Union

Size Range 1/8″ – 3″ / DN6 – DN80
Pressure Rating Class 3000lbs
Standard MSS SP-83
Carbon Steel ASTM A105 / A105N
Low Temp Carbon Steel ASTM A350 LF2 / LF3
Pipeline Steel ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92 / 22
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 310S, 317, 347, 904, 321
Duplex Stainless Steel ASTM A182 F51, F53, F44

Usage of SW Union

Socket welding (SW) is used for welding pipes and fittings including reducers, tees and elbows. Socket weld pipe fittings are used to permanently join pipes that are inserted into a recess in the fitting, flange or valve. Once correctly inserted, fillet type sealing welds are applied to join the pipe to the fitting.


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