Socket weld flange simplified as SW flange, it has a recessed area (like a shoulder) in the flange bore, this shoulder serves as a guide to set the depth of the pipe that inserted to the flange. Socket welding flange initially designed for high pressure small diameters piping system.

Socket weld flange could replace threaded flange, to minimize the risky of leakage during transportation of liquids like oil and gas.  Socket weld flange is recommended for applications where internal welding operations are particularly difficult. This sock welded construction eliminates internal pockets while avoiding warpage of welding heat and damage to the flange face caused by weld spatter. It has the same internal pressure as the sliding on the flange, and has a better fatigue life.

The socket welding flange was firstly to use for stainless steel superheater, due to avoid cracking defects caused by thermal stresses in heating processes, and after years development it became a standard applications for all types of forged grades, like ASTM A105, DIN ST.37.2 in carbon, alloy and stainless steel.

PENGTONG sells all kinds of blind flange in steel grade ST37, S235 JRG2, SS400, CT.20 and A105. Please email or call us for your flange quote!