Types
Butt-weld cap
To ASME B16.9, wall to match the pipe.
Light-wall cap
To MSS SP-43, Sch 5S or 10S.
Large heads
Elliptical or torispherical, pressed 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 | Large heads and non-standard 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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