Heavy Duty Steel Pipe Caps | Corrosion Resistant & Leak-Proof
Durable steel pipe caps for sealing pipeline ends. High-pressure rated, weldable & threaded options. Factory tested. Get a quick quote today!
Description
Heavy Duty Steel Pipe Caps | Corrosion Resistant & Leak-Proof
Material & Manufacturing Standards
Connection Types & Pressure Classes
- Welded Type: Designed for permanent high-pressure sealing. For instance, weld on pipe caps steel can be directly butt-welded with pipe ends, and the weld strength reaches more than 90% of the base metal. For main pipeline branches or head positions, weldable pipe caps are equipped with beveled ends to facilitate full penetration welding.
- Threaded Type: NPT/BSPT tapered pipe thread, ideal for quick installation under medium and low pressure.
- Socket Weld Type: Applied to small-bore (DN15-DN80) high-pressure circuits.
Key Features of steel pipe caps
- Precise Wall Thickness Control: Wall thickness tolerance complies with ASME B16.9, and the minimum wall thickness is no less than 87.5% of the nominal wall thickness.
- Hydrogen Induced Cracking Resistance: Pass HIC/SSC tests, compliant with NACE MR0175 for acidic service environments.
- Full Size Coverage: Sizes from 1/2 inch to 48 inches. Among them, 4 inch weld on pipe cap is the most commonly used specification in HVAC and process pipelines with sufficient stock in stock.
steel pipe caps Specification Data Sheet
| Nominal Diameter (Inch) | Outer Diameter (mm) | Height (mm) | Wall Thickness (mm) | Pressure Class | Connection Type |
|---|---|---|---|---|---|
| 1/2 | 21.3 | 25 | 3.73 | Class 3000 | Threaded / Socket Weld |
| 2 | 60.3 | 57 | 5.16 | Class 1500 | Butt Weld |
| 4 | 114.3 | 89 | 6.02 | Class 150 | Butt Weld (Weldable) |
| 8 | 219.1 | 127 | 8.18 | Class 600 | Butt Weld |
| 12 | 323.9 | 178 | 9.53 | Class 900 | Butt Weld |
Application Scenarios of steel pipe caps
- Pig launcher and receiver end for long-distance oil & gas transmission pipelines
- Temporary line blinding in chemical plants (alternative to blind flanges for space saving)
- Protection for drain outlets in seawater cooling systems
- Structural steel column base capping (load-bearing pipe caps)
Buyers’ Common FAQs
Q1: Can steel pipe caps be used repeatedly if I need to reopen the pipeline?
A: For threaded or socket-weld caps, yes – they can be removed with proper tools and reused if threads remain undamaged. However, weld on pipe caps steel are intended for permanent closure. If periodic access is required, we recommend using a threaded cap or a blind flange. We can also supply weldable pipe caps with a purge hole for temporary welding during hydrotesting.
Q2: What is the difference between a standard steel pipe cap and a 4 inch weld on pipe cap for high-temperature steam service?
A: A standard cap may use generic carbon steel (e.g., ASTM A105). Our 4 inch weld on pipe cap steel for steam lines is manufactured from ASTM A234 WPB with controlled silicon content (0.15–0.30%) and post-weld heat treatment (PWHT) when wall thickness exceeds 19 mm. This reduces residual stress and prevents creep failure at temperatures up to 550°C (1022°F). Always specify design temperature and pressure when ordering.
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