Weld fitting
A butt-weld fitting is welded directly to a pipe with the same outside diameter and wall thickness. It gives continuous piping with no gasket; for steel, EN 10253-2 covers these fittings for pressure equipment, including at elevated temperatures.
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The family covers, from DN6 to DN500:
- elbows, equal and reducing tees, reducers, caps, stub ends, sockets, welding ends and weld-in bulkhead fittings;
- in dual-grade steel, P265GH to EN 10253-2 and ASTM A234 WPB, in A420 WPL6 steel (the ASTM specification for fittings for low-temperature service) and in A105 forged steel;
- in 316 and 316L stainless steel;
- in 90/10 copper-nickel, PN10, for seawater piping.
The wall thickness is chosen to match the pipe: as a schedule (SCH 10, STD, XS, SCH 40, SCH 80…) for inch series, in millimetres for metric series and copper-nickel. The product name of each fitting gives it.
Depending on the model, the data sheets state Lloyd's or RINA (notably for copper-nickel) and 3.1 or 3.2 certificates under EN 10204.
For a joint that can be dismantled, see weld neck flanges and stub ends; for pipe, see the Pipe family.
Brand: RPM.
