IBR Approved · Buttweld Fittings
Buttweld Pipe Cap Manufacturer
Dished buttweld end caps to ASME B16.9 — in carbon, alloy, stainless and duplex steel. 1/2" to 48" NB, SCH 20 to XXS. IBR approved with Form IV (Part D) (formerly Form III-C), EN 10204 3.1 / 3.2 traceable.
Overview
A buttweld pipe cap is a dished end closure welded onto the end of a pipe to seal a run, close a header or provide a future tie-in point. Made to ASME B16.9, it is a pressure-containing component matched to the pipe's material specification, schedule and certification.
Every cap is produced to the applicable material specification with full traceability, supplied with EN 10204 3.1 or 3.2 test certificates and, for boiler and steam service, IBR Form IV (Part D) certification.
Cap Types & Standards
| Type | Standard | Typical Use |
|---|---|---|
| Buttweld Cap (dished) | ASME B16.9 | Sealing plain pipe ends, headers |
| Reducing Cap | ASME B16.9 (on enquiry) | Closure with size step |
| Large-diameter Cap | MSS SP-75 | Pipeline & large-bore closures |
Available Material Grades
Pipe caps are supplied in our full material range. Click a grade for full specification, chemistry and mechanical data:
Technical Specifications
| Parameter | Range |
|---|---|
| Size range | 1/2" to 48" NB (larger on enquiry) |
| Schedules | SCH 20, STD, XS, SCH 80, SCH 160, XXS |
| Dimensional standard | ASME B16.9 (MSS SP-75 for large OD) |
| End preparation | Bevel end per ASME B16.25 |
| Certification | EN 10204 3.1 / 3.2 · IBR Form IV (Part D) |
| Testing | PMI, dimensional, DP / RT as specified |
Testing & Inspection
- ✓ Chemical and mechanical testing against the ordered ASTM / ASME material specification
- ✓ PMI (positive material identification) and visual and dimensional inspection to ASME B16.9
- ✓ NDT (DP / MPI, UT or RT) as your specification requires
- ✓ EN 10204 3.1 certificate as standard; 3.2 witnessed by Bureau Veritas, TÜV, Lloyd’s Register, SGS, DNV or your own inspector
- ✓ IBR Form IV (Part D) for Indian boiler piping
Export Documents & Packing
- ✓ Commercial invoice, packing list and certificate of origin
- ✓ Heat-number traceability on every piece
- ✓ Seaworthy wooden cases or pallets, bevel ends protected, marked to your instructions
- ✓ FOB, CFR or CIF terms — see how an export order works
Frequently Asked Questions
What is a buttweld pipe cap used for?
A buttweld pipe cap is a dished end closure welded onto the end of a pipe to seal it. It is used to terminate a pipe run, close a header, or provide a future tie-in point. Made to ASME B16.9, it is a pressure-containing component supplied to the same material specification and certification as the pipe it closes.
What is the difference between a pipe cap and a plug?
A buttweld cap fits over the outside of a pipe end and is welded around the circumference to seal it (used on plain pipe ends to ASME B16.9). A plug is a threaded fitting that screws into a threaded outlet. For welded piping systems the buttweld cap is standard; we supply caps across carbon, alloy, stainless and duplex grades.
Which certificates and documents come with your pipe caps?
EN 10204 3.1 certificates as standard, 3.2 with third-party inspection, IBR Form IV (Part D) (formerly Form III-C) where the fittings are for Indian boiler piping, plus export documents: commercial invoice, packing list and certificate of origin.