Types
90° long-radius elbow
Bend radius 1.5D — the standard choice.
90° short-radius elbow
Bend radius 1D, where space is tight; higher pressure drop.
45° elbow
Long radius, for shallow changes of direction.
180° return
Long or short radius, for heat-exchanger coils and furnace tubes.
Reducing elbow
Turns and changes size in one fitting.
3D and 5D bends
Large radius, for pigging and low pressure drop; made to drawing.
Standards and size range
| Standard | Size range | Rating / wall |
|---|---|---|
| ASME B16.9 | NPS ½–48 | Wall to match the pipe |
| MSS SP-43 | Light-wall, corrosion-resistant | Sch 5S / 10S |
| EN 10253-4 | Stainless (duplex, super-austenitic) | — |
| GB/T 12459, GB/T 13401 | per standard | — |
| Drawing | Non-standard angles, large-radius bends and large sizes | |
Ranges are those covered by each standard; please confirm large sizes, high ratings and non-standard sizes on enquiry.
WP or CR: WP fittings follow ASME B16.9; CR fittings follow MSS SP-43 light-wall dimensions and need no NDE.
For welded WP fittings with every weld examined, specify WX (radiography) or WU (ultrasonic); plain W allows the seam weld of the starting pipe, if made without filler metal, to go untested.
Manufacturing and inspection
- Seamless fittings are hot- or cold-formed from seamless pipe; welded fittings are formed from plate and welded. All are solution-annealed or annealed to the material specification after forming.
- Every lot is checked for dimensions and surface condition, with PMI to confirm the alloy.
- Welded fittings are radiographed or ultrasonically tested as ordered; intergranular or pitting corrosion tests are carried out when specified.
- Marking to MSS SP-25; thin-wall fittings are etched or stencilled, not die-stamped.
- EN 10204 3.1 certificates with every delivery; 3.2 with third-party witnessing on request.
Need a quote?
Send your specification, drawing or material list as it is; a grade and size are enough to start, and we confirm the rest in our reply. · info@kochlin.com
Other fittings and products
FlangesWeld neck, slip-on, socket weld, threaded, lap joint, blindTeesEqual and reducing tees and crossesReducersConcentric and eccentricCapsButt-weld caps, light-wall caps and large headsStub endsLong and short pattern, with lap-joint flangesProduct formsTube & pipe, Plate, Strip, Bar, Forgings, Wire & filler metals