Premium Steel Pipe Caps for Pipeline Terminations
A pipe cap, also known as a plug, head, or bulkhead, is an essential pipe fitting welded or threaded to the pipe end to securely seal and cap off a piping system. We offer a comprehensive range of high-quality seamless and welded pipe caps designed to withstand extreme pressures and harsh environments.
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Size Range: Seamless Pipe Caps (1/2″ ~ 24″) | ERW / Welded Pipe Caps (1/2″ ~ 48″).
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Wall Thickness: 3mm ~ 40mm (SCH5 to XXS).
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Materials: Carbon Steel, Stainless Steel, and Alloy Steel.
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Standards: ASME B16.9, MSS SP-43/SP-75, DIN 2605/2617, JIS B2311/B2312, GB/T 12459/13401.
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Coating Options: Black paint, varnish, hot-dip galvanizing, 3PE, epoxy, and more.
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Applications: Petroleum, chemical processing, power plants, gas lines, metallurgy, and shipbuilding.
Description
1. Product Overview
A Pipe Cap (also known as a plug, head, bulkhead, or blind flange) is a pipe fitting designed to cover the end of a pipe, effectively stopping the flow of fluids and sealing the pipeline system. They are generally welded to the pipe end or fitted onto an external thread.
We supply a wide range of steel pipe caps, manufactured in both seamless and welded forms, to accommodate various industrial demands. Our caps provide secure, leak-proof terminations for high-pressure, high-temperature, and corrosive pipeline applications.
2. Specification of Steel Pipe Cap
| Feature | Details |
|---|---|
| Outer Diameter | Seamless Pipe Caps: 1/2″ ~ 24″ ERW / Welded Pipe Caps: 1/2″ ~ 48″ |
| Wall Thickness | 3mm ~ 40mm / SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Materials | Carbon Steel: SY/T5257-2004, DL/T515-2004, ASTM A234 WPB, WPC, ASTM A105 WPB, WPC, ASTM A420 WPL6, WPL3, DIN 17175-79, DIN 2448-81, ST45.8, ST35.8, DIN 1629, PB… Stainless Steel: ASTM A403 WP304, 304L, 316, 316L, 321, 1Cr18Ni9Ti, 00Cr19Ni10, 00Cr17Ni14Mo2, etc. Alloy Steel: ASTM A234 WP12, WP11, WP22, WP5, WP9, WP91, 16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, etc. |
| Coating Options | Black paint, varnish, rust-proof oil, hot-dip galvanizing, cold galvanizing, 3PE coating, epoxy coating, etc. |
| Usage | Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc. |
3. Standard of Steel Pipe Cap
| Standard Origin | Standard Code | Designation |
|---|---|---|
| ASME | ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
| ASME B16.28 | Wrought Steel Buttwelding Short Radius Elbows and Returns | |
| MSS | MSS SP-43 | Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| MSS SP-75 | Specification for High Test Wrought Butt Welding Fittings | |
| DIN | DIN 2605 | Steel Butt-Welding Pipe Fittings |
| DIN 2617 | Steel Butt-Welding Pipe Fittings – Caps | |
| JIS | JIS B2311 | Steel Butt-Welding Pipe Fittings for Ordinary Use |
| JIS B2312 | Steel Butt-Welding Pipe Fittings | |
| GB | GB/T 12459 | Steel Butt-Welding Pipe Fittings |
| GB/T 13401 | Steel Plate Butt-Welding Pipe Fittings |
4. ASME B16.9 Caps Dimensions
| Nominal Pipe Size (NPS) | Outside Diameter at Bevel (mm) | Length E (mm) | Limiting Wall Thickness for Length E (mm) | Length E1 (mm) |
|---|---|---|---|---|
| 1/2 | 21.3 | 25 | 4.6 | 25 |
| 3/4 | 26.7 | 25 | 3.8 | 25 |
| 1 | 33.4 | 38 | 4.6 | 38 |
| 1-1/4 | 42.2 | 38 | 4.8 | 38 |
| 1-1/2 | 48.3 | 38 | 5.1 | 38 |
| 2 | 60.3 | 38 | 5.5 | 44 |
| 2-1/2 | 73.0 | 38 | 7.0 | 51 |
| 3 | 88.9 | 51 | 7.6 | 64 |
| 3-1/2 | 101.6 | 64 | 8.1 | 76 |
| 4 | 114.3 | 64 | 8.6 | 76 |
| 5 | 141.3 | 76 | 9.7 | 89 |
| 6 | 168.3 | 89 | 11.0 | 102 |
| 8 | 219.1 | 102 | 12.7 | 127 |
| 10 | 273.0 | 127 | 12.7 | 152 |
| 12 | 323.8 | 152 | 12.7 | 178 |
| 14 | 355.6 | 165 | 12.7 | 191 |
| 16 | 406.4 | 178 | 12.7 | 203 |
| 18 | 457.0 | 203 | 12.7 | 229 |
| 20 | 508.0 | 229 | 12.7 | 254 |
| 22 | 559.0 | 254 | 12.7 | 254 |
| 24 | 610.0 | 267 | 12.7 | 305 |
| 26 | 660.0 | 267 | – | – |
| 28 | 711.0 | 267 | – | – |
| 30 | 762.0 | 267 | – | – |
| 32 | 813.0 | 267 | – | – |
| 34 | 864.0 | 267 | – | – |
| 36 | 914.0 | 267 | – | – |
| 38 | 965.0 | 305 | – | – |
| 40 | 1016.0 | 305 | – | – |
| 42 | 1067.0 | 305 | – | – |
| 44 | 1118.0 | 343 | – | – |
| 46 | 1168.0 | 343 | – | – |
| 48 | 1219.0 | 343 | – | – |
5. Manufacturing Process Flow
We implement a strict sequence of manufacturing, forging, heat treatment, and precision machining to ensure all pipe caps meet or exceed international pressure and tolerance standards.
Raw Material Cutting → Heating → Forming (Hot Forging/Pressing) → Heat Treatment → Calibration → End Beveling/Machining → Non-Destructive Testing (NDT) → Coating & Marking → Packing.
Schematic Diagram of Pipe Cap Production and Inspection