Carbon Steel & Stainless Steel Butt Weld Pipe Caps for Reliable Pipeline End Sealing
Our seamless butt weld pipe cap is hot spinning formed pipe fitting for sealing pipeline terminal ends. Manufactured strictly to ASME B16.9 & Indian IS 1239 standards, all sizes keep full nominal dimension without minus tolerance, widely used for petroleum, chemical, power and water supply pipeline end closure.
Overview Of Butt Weld Pipe Cap
Butt Weld Pipe Cap, also known as pipeline end cap, is a seamless hot spinning butt-weld fitting with hemispherical dome structure. It is welded to the terminal of pipelines to fully seal flow passages, isolate medium and protect pipeline ends from dust, corrosion and pressure leakage.
Integral seamless spinning forming ensures uniform wall thickness and excellent pressure resistance. Raw materials cover carbon steel A234 WPB and stainless steel A403 WP304 / WP316L. We strictly control outer diameter and wall thickness of every pipe cap, guarantee zero minus tolerance without thin-wall cutting corners. Complete inch & metric size range supports all industrial pipeline matching requirements.
You may also check our Reducing Butt Weld Tee and Eccentric Butt Weld Reducer for more butt weld piping fittings.
Core Key Features OF Butt Weld Pipe Cap
1. One-piece seamless construction
- Uniform wall thickness and excellent structural integrity
- High resistance to pressure, impact, and mechanical stress
2. Hemispherical dome design
- Smooth inner surface for minimal flow disturbance
- Eliminates turbulence and reduces the risk of material buildup
3. Butt-weld connection
- Provides a permanent, leak-proof joint for heavy-duty pipelines
- Suitable for high-temperature and high-pressure service conditions
4. Strict material & dimensional control
- Available in A234 WPB, WP11, WP22, and stainless steel grades
- Close tolerance on outer diameter, wall thickness, and overall length
- Ensures full compatibility with matching pipe ends
5. Full size coverage
- From DN15 (1/2″) to DN1200 (48″)
- Custom sizes and materials available upon request
6. Quality assurance
- Raw material verification
- Ultrasonic testing (UT) and hydrostatic testing where applicable
- Complete MTC and test certificates available on request
Technical Specification
| Item | Technical Parameter |
| Product Name | Butt Weld Pipe Cap / End Cap |
| Connection Type | Butt Weld (BW) |
| Production Craft | Seamless Hot Spinning Forming |
| Executive Standard | ASME B16.9, ASTM A234, ASTM A403, IS 1239 |
| Main Materials | Carbon Steel A234 WPB; Stainless Steel A403 WP304 / WP316L |
| Size Range | DN15 ~ DN1200 / 1/2″ ~ 48″ |
| Wall Schedule | Sch40, Sch80, Sch160, XXS, Custom wall thickness |
| Structure Feature | Hemispherical dome for pipeline end sealing |
| Dimensional Tolerance | Full standard nominal size, zero minus tolerance |
| Inspection Items | UT Ultrasonic Test, Hydrostatic Pressure Test, Full Dimension Inspection |
| Surface Treatment | Black anti-rust paint / Sandblasting (Carbon Steel); Pickling & Passivation (Stainless Steel) |
Applications
Our butt weld pipe caps are widely used in industrial piping systems where reliable end sealing is required:
- Petroleum and natural gas transmission pipelines
- Chemical and petrochemical process piping
- Thermal power station steam and condensate lines
- Water supply, sewage, and municipal wastewater systems
- Food and pharmaceutical industry piping
- Indian IS 1239 standard industrial pipeline projects
- Offshore platform piping and subsea pipeline termination
Why Choose Our Butt Weld Pipe Cap
- Direct factory manufacturer supply, large stock of regular sizes, competitive ex-work factory price
- All pipe caps produced to full standard dimensions with zero minus tolerance, never cut corners with thin walls
- Support custom wall thickness, length and surface treatment based on customer drawings
- Complete full-process quality inspection, full set of test certificates for export customs clearance
- Fast delivery within 7–15 working days for standard stock items
- Standard export wooden case packaging, anti-rust and anti-collision protection for long-distance sea transport
FAQ
Q1: What is pipe cap used for?
Q2: Do your butt weld pipe caps have minus tolerance on wall thickness?
Q3: Can you produce pipe caps complying with Indian IS 1239 standard?
Q4: Can you supply stainless steel butt weld pipe caps?
Q5: What materials do you offer?
A: We mainly supply carbon steel A234 WPB, WP11, WP22 and stainless steel butt weld pipe caps for different pressure and corrosion resistance requirements.
Q6:What other butt weld pipe fittings are available for pipeline direction change and branch connection?
A:We supply a full range of butt weld fittings, including 180 Degree Butt Weld Bend for pipeline reversing and Weldolet Butt Weld Branch Outlet for pipe branch tapping.
