Types
Equal tee
Run and branch the same size.
Reducing tee
Branch smaller than the run.
Equal cross
All four ends the same size.
Reducing cross
Branch ends smaller than the run.
Seamless tees are bulged or extruded from pipe; welded tees cover larger sizes.
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 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
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