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Steel Pipe Caps
Our high-quality pipe caps are essential components designed to seal the ends of pipelines, protecting the pipe threads and internal surfaces from debris, corrosion, and damage during transit or storage. Manufactured to withstand high pressure and extreme temperatures, these caps ensure a leak-proof termination for various piping systems.
1. Technical Specifications
Type:Butt Weld (BW) Caps, Socket Weld (SW) Caps, Threaded (NPT/BSPT) Caps.
Size Range:1/2" to 72" (DN15 – DN1800).
Wall Thickness:SCH 5S to SCH XXS.
Shapes:Elliptical, Hemispherical, Flat, and Round caps.
2. Material Grades & Standards
We provide pipe caps in a full range of materials to match your existing piping infrastructure:
Carbon Steel:ASTM A234 WPB, WPC; ST37.2, A105.
Stainless Steel:ASTM A403 WP304/304L, WP316/316L, 321, 310S.
Alloy Steel:ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91.
Low Temperature:ASTM A420 WPL6.
High Yield:MSS-SP-75 WPHY 42, 52, 60, 65, 70.
3. Manufacturing Standards
All fittings are produced and tested in strict accordance with global industrial requirements:
ASME/ANSI B16.9(Factory-Made Wrought Buttwelding Fittings)
ASME B16.11(Forged Fittings, Socket-Welding and Threaded)
DIN 2617(Steel Butt-Welding Pipe Fittings; Caps)
JIS B2311 / B2312
4. Key Features & Applications
Superior Protection:Prevents internal contamination and protects beveled ends during maritime shipping.
High Pressure Resistance:Ideal for Oil & Gas, Petrochemical, and Power Generation sectors.
Surface Treatment:Available in Black Vanish, Anti-rust Oil, Hot-dip Galvanized, or Pickled & Passivated (for Stainless Steel).
Easy Installation:Precision-machined threads and beveled ends ensure a perfect fit with pipes and vessels.
Steel Fittings Specifications
| Material | Grades |
| Nickel Alloy | ASTM / ASME SB 336 UNS 2200 (NICKEL 200), UNS 2201 (NICKEL 201), UNS 4400 (MONEL 400), UNS 8020 (ALLOY 20 / 20 CB 3), UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276) |
| Carbon Steel | ASTM / ASME A/SA 234 GR. WPB, WPC, WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70 |
| Low Alloy Steel | ASTM / ASME A/SA 234 GR. WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 23, WP 91 |
| Low Temp Carbon steel | ASTM A420 WPL3, A420 WPL6 |
| Duplex and Super Duplex Steel | ASTM A 815, ASME SA 815 UNS NO S31803, S32205. UNS S32750, S32950. Werkstoff No. 1.4462 |
| Stainless Steel | ASTM A403 WP316/316L, ASTM A403 SA / A 774 WP-S, WP-W, WP-WX 304/304L, ASTM A182 F316L, 304L, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404 |
| High Strength Ferritic Steel | ASTM A860 WPHY42, WPHY52, WPHY60, WPHY65, WPHY70 |
| Titanium | ASTM / ASME SB 363 GR. 1, GR. 2, GR. 3, GR. 4, GR. 5, GR. 7, GR. 9, GR. 12, GR. 23 |
| Cu Ni Alloy | C70600 (90:10), C71500 (70:30), C71640 |
Butt welding Fittings Manufacturing Standards
| Standard | Type |
| ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
| ASME B16.28 | Wrought Steel Short Radius Elbows and Buttwelding Returns |
| ASME B16.49 | Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems |
| MSS SP43 | Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| MSS SP75 | Specification for High-Test, Wrought, Butt-Welding Fittings |
Pipe Caps Production Process
They usually choose a cap when they want a simple welded end closure rather than a removable joint. The decision often comes down to maintenance access, pressure confidence, and layout simplicity. Typical long-tail contexts include carbon steel pipe cap for process piping, butt weld cap for oil and gas line, and ASTM A234 WPB end cap.
The biggest differences usually come from wall thickness, manufacturing route, small-batch complexity, and whether the order needs project documents or export-ready packing. Simple fittings can still be execution-sensitive. This is noticeable when buyers compare a pipe cap with other end-closure solutions in refinery piping or water treatment systems.
A useful question is whether the closure needs to be permanent, inspection-friendly, or tied to a matching schedule-sensitive line. That usually determines whether a cap is really the best choice. That question is useful in pressure piping, skid fabrication, and utility line closure decisions.
They often overlook schedule matching and how the cap will be welded into the actual system. Those small details are where fit-up issues usually begin. Schedule mismatch is common in butt weld cap supply for process piping where the connected line thickness was assumed rather than checked.
Steel Fittings Specifications
| Material | Grades |
| Nickel Alloy | ASTM / ASME SB 336 UNS 2200 (NICKEL 200), UNS 2201 (NICKEL 201), UNS 4400 (MONEL 400), UNS 8020 (ALLOY 20 / 20 CB 3), UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276) |
| Carbon Steel | ASTM / ASME A/SA 234 GR. WPB, WPC, WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70 |
| Low Alloy Steel | ASTM / ASME A/SA 234 GR. WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 23, WP 91 |
| Low Temp Carbon steel | ASTM A420 WPL3, A420 WPL6 |
| Duplex and Super Duplex Steel | ASTM A 815, ASME SA 815 UNS NO S31803, S32205. UNS S32750, S32950. Werkstoff No. 1.4462 |
| Stainless Steel | ASTM A403 WP316/316L, ASTM A403 SA / A 774 WP-S, WP-W, WP-WX 304/304L, ASTM A182 F316L, 304L, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404 |
| High Strength Ferritic Steel | ASTM A860 WPHY42, WPHY52, WPHY60, WPHY65, WPHY70 |
| Titanium | ASTM / ASME SB 363 GR. 1, GR. 2, GR. 3, GR. 4, GR. 5, GR. 7, GR. 9, GR. 12, GR. 23 |
| Cu Ni Alloy | C70600 (90:10), C71500 (70:30), C71640 |
Butt welding Fittings Manufacturing Standards
| Standard | Type |
| ASME B16.9 | Factory-Made Wrought Buttwelding Fittings |
| ASME B16.28 | Wrought Steel Short Radius Elbows and Buttwelding Returns |
| ASME B16.49 | Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems |
| MSS SP43 | Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| MSS SP75 | Specification for High-Test, Wrought, Butt-Welding Fittings |
Pipe Caps Production Process
They usually choose a cap when they want a simple welded end closure rather than a removable joint. The decision often comes down to maintenance access, pressure confidence, and layout simplicity. Typical long-tail contexts include carbon steel pipe cap for process piping, butt weld cap for oil and gas line, and ASTM A234 WPB end cap.
The biggest differences usually come from wall thickness, manufacturing route, small-batch complexity, and whether the order needs project documents or export-ready packing. Simple fittings can still be execution-sensitive. This is noticeable when buyers compare a pipe cap with other end-closure solutions in refinery piping or water treatment systems.
A useful question is whether the closure needs to be permanent, inspection-friendly, or tied to a matching schedule-sensitive line. That usually determines whether a cap is really the best choice. That question is useful in pressure piping, skid fabrication, and utility line closure decisions.
They often overlook schedule matching and how the cap will be welded into the actual system. Those small details are where fit-up issues usually begin. Schedule mismatch is common in butt weld cap supply for process piping where the connected line thickness was assumed rather than checked.
