Knowledge
A flange is a mechanical component used to connect pipes, valves, pumps, and other equipment in a piping system. Typically secured with bolts and a gasket, flanges create a reliable, leak-resistant connection while allowing the system to be easily assembled, disassembled, inspected, and maintained.
ASTM A182 · ASME B16.5 · Class 150 / 300 · 1/2"–24"
304L
316L
Stainless steel flanges in various sizes, pressure classes, and configurations, with custom specifications available.
Shop sequence
Stainless flange production is a single path: qualify the bar, forge the blank, heat-treat, machine the face and bore, then mark and pack.
Purchase, incoming inspection, and qualified bar into stock.
Cut, heat, and forge the blank. Control the finish-forging temperature.
Stabilize the structure, then inspect before the blank is machined.
Face, bore, drill bolt holes, and bevel the weld end to drawing.
Clean, mark, final inspect, pack, and dispatch.
Type catalog
Each flange type is a different joint. Match the connection to pressure, alignment, and how often the line will be opened.
01
Butt-welded to the pipe through a tapered hub. The bore matches the pipe, so flow stays smooth and stress is carried into the hub rather than the flange face.
02
The pipe slides into the bore and is fillet-welded inside and out. Alignment is easier, and the hub is shorter than a welding neck.
03
A loose ring sits over a stub end. Bolt holes can rotate for alignment, and the ring can be a different grade from the wetted stub.
04
Screws onto a threaded pipe. No weld is required, so it suits small lines where welding is restricted or impractical.
05
A solid disc with no bore. It closes a line, blanks a nozzle, or holds pressure during hydrotest.