Pipe Cap Weld: Secure Pipeline Termination
Need reliable pipe cap weld for high-pressure lines? Our weldable pipe caps in carbon/stainless steel ensure zero leakage. ASME B16.9 certified. Get instant quote!
Description
Pipe Cap Weld: Secure Pipeline Termination
Material & Manufacturing Standard
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Common Materials
Carbon Steel: ASTM A234 WPB
Stainless Steel: ASTM A403 WP304 / WP316 / 316L
Low-temperature Steel: ASTM A420 WPL6
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Production Process
Formed by cold stamping or hot pressing; end bevel processed in accordance with ASME B16.9.
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Nondestructive Testing
100% ultrasonic thickness measurement + magnetic particle inspection (MT);
Critical order batches are supplemented with radiographic testing (RT) for higher safety requirements.
Connection Method
The pipe cap end is prefabricated with U-type or V-type bevel to match pipe ends, enabling on-site circumferential welding. The integrated welded structure removes gaskets and thread gaps, perfectly suitable for pipelines with frequent vibration and drastic temperature fluctuation.
Core Features of Weldable Pipe Cap
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Zero Leakage Sealing
Weld strength coefficient exceeds 0.85 per GB/T 20801 standard, realizing permanent tight sealing.
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High Pressure Resistance
Covers pressure classes from CL150 to CL2500 (PN20~PN420), meeting heavy-duty industrial requirements.
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Full Size Coverage
Size ranges from 1/2″ to 48″, with customized maximum size up to 64″.
4 inch weld on pipe cap is the standard option for industrial cooling water and medium-pressure steam lines.
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Excellent On-site Weldability
All units are qualified weldable pipe caps. Bevel angle tolerance ≤±2.5°, no secondary cutting or processing needed for quick installation.
Technical Parameters
| Item | Specification Range |
|---|---|
| Nominal Size (NPS) | 1/2″～48″, customized up to 64″ |
| Wall Thickness | SCH10, SCH20, STD, SCH40, SCH80, SCH160, XXS |
| End Bevel | Plain end / 30° single V-bevel (ASME B16.25) |
| Material Grade | Carbon Steel: A234 WPB
Stainless Steel: A403 WP316L Low-temp Steel: A420 WPL6 |
| Pressure Class | Class 150 – Class 2500 |
| Working Temperature | -29℃ ~ +540℃ (subject to material) |
Application Scope
- Oil & gas long-distance pipelines: Seal spare ports and blind sections
- Power plant main steam & drain system: High-temperature resistant weld caps against cavitation erosion
- Chemical acid & alkali pipelines: 316L weld on pipe caps steel for pitting corrosion resistance
- Marine & shipbuilding cooling system: 4 inch weld on pipe cap for anti-impact seawater service
Professional Selection Tip
FAQ：
Q1: Can I use a weldable pipe cap on a threaded pipe end?
A: No. Weldable pipe caps are designed for butt-welding to plain-end pipes. If your pipe has threaded ends, you would need a threaded cap or an adapter. Direct welding onto threads will cause cracking due to stress concentration. Always match connection types.
Q2: How do I select the correct wall thickness for a 4 inch weld on pipe cap?
A: The cap wall thickness should match or exceed the pipe’s schedule (e.g., SCH40 pipe needs a SCH40 cap). For high-pressure systems (above ANSI 600), we recommend moving up one schedule (e.g., SCH80) and conducting a hydrostatic test post-welding. Our technical datasheet provides a pressure-temperature rating matrix – contact us for a custom calculation.
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