Allows for quick disassembly without disturbing the entire system, facilitating maintenance and inspection.
When properly welded and assembled, provides a secure and leak-proof joint for reliable operation.
Reduces overall cost by using expensive materials only where needed, with cheaper backing flanges.
A stub end is a type of pipe fitting used in various industrial applications to connect pipes or flanges. It acts as a sleeve that slips over the pipe or lap joint flange, allowing for easy and quick disassembly when needed.
Stub End is a pipe fitting used in industrial piping systems, welded to a pipe and paired with a lap joint flange to form a flanged connection. Compliant with ASTM A234 WPB standards, this carbon steel fitting offers robust pipeline corrosion protection and durability, making it ideal for boiler pipeline protection in oil and gas, petrochemical, and power generation industries as of 2:15 AM PDT, September 01, 2025. Its butt-weld design ensures strong, leak-proof connections, while the lap joint flange facilitates easy alignment and disassembly.
The Stub End is manufactured in three types (A, B, C) and two standard lengths (short and long pattern) using seamless or welded processes. Common materials include ASTM A234 WPB (carbon steel) for general-purpose applications, ASTM A234 WP22 (low-alloy steel) for high-temperature environments, or ASTM A403 TP347H (stainless steel) for superior corrosion resistance. Available in sizes from 1/2” to 48” (DN 15–DN 1200) and wall thicknesses such as SCH 10, SCH 40, or SCH 80, it meets diverse industrial piping requirements. Rigorous testing, including tensile, hydrostatic, and non-destructive tests (radiography or ultrasonic), ensures compliance with ASME B16.9 and MSS SP-43 standards.
Engineered for pipeline corrosion protection, the Stub End can be coated with epoxy, galvanizing, or 3LPE to withstand harsh environments like offshore pipelines or chemical plants. Its robust construction resists wear from abrasive materials and high-pressure conditions, ensuring reliability for boiler pipeline protection. The fitting is welded to the pipe using methods like SMAW, GTAW, or GMAW with compatible fillers (e.g., low-carbon for WPB, E9018-B3 for WP22), ensuring seamless integration with pipelines like ASTM A106 Gr.B or API 5L Gr.B.
Unlike branching fittings like Equal Tee, Reducing Tee, Lateral Tee, or ASTM A234 WP22 Tee (as discussed in your previous queries), the Stub End is designed for flanged connections, enabling cost savings by using lower-grade lap joint flanges (e.g., carbon steel) with high-grade stub ends (e.g., stainless steel). Type A stub ends match lap joint flange profiles, Type B suits slip-on flanges, and Type C is flared for versatility. Its design supports applications requiring frequent disassembly, such as maintenance-heavy systems. For highly corrosive environments, stainless steel options like ASTM A403 TP347H are preferred.
The Stub End addresses challenges like pipeline corrosion, connection reliability, and cost efficiency in industrial systems. Its flexible design and material options ensure long-term performance, safety, and cost-effectiveness, making it a top choice for engineers seeking robust industrial piping and boiler pipeline protection solutions.
Quick removal of piping sections without disturbing the entire system for maintenance and inspection.
Use expensive materials only where needed, with cheaper backing flanges reducing overall cost.
Rotating backing flange allows easy alignment of bolt holes during installation.
Properly welded and assembled stub ends provide secure and leak-proof joints.
Compatible with various flange types and available in wide range of materials and sizes.
Manufactured to strict international standards with comprehensive testing and inspection.
Description: Produced and machined specifically to fit lap joint flanges.
Description: Suited for standard slip-on flanges acting as lap-joint flanges.
Description: Versatile for both lap joint and slip-on backing flanges.
Description: Similar to Type "C" with concentric serrations on lap face.
Longer length for easier alignment and welding. Suitable for frequent disassembly applications.
Standard Lap Joint FlangesSimilar length to pipe. Ideal for space-limited applications where flange needs to be close to pipe end.
Slip-On FlangesIn piping systems, a stub end is a crucial component used for connecting pipes of different materials and sizes. It provides a convenient and cost-effective solution for achieving a leak-free joint without the need for welding. In this article, we will explore the geometry, types, and applications of stub ends, shedding light on their significance in various industries and projects.
| N.D. | Out diameter | Hight(F) | Stub end O.D.(G) | Beveld radio(R) | ||||
|---|---|---|---|---|---|---|---|---|
| NPS | DN | OD | Mss | ANSI | Nominal&max | Nominal&min | A Max | B Max |
| 1/2 | 15 | 21.3 | 50.8 | 76.2 | 35 | 34 | 3 | 0.8 |
| 3/4 | 20 | 26.7 | 50.8 | 76.2 | 43 | 42 | 3 | 0.8 |
| 1 | 25 | 33.4 | 50.8 | 101.6 | 51 | 50 | 3 | 0.8 |
| 1 1/4 | 32 | 42.4 | 50.8 | 101.6 | 64 | 63 | 4.8 | 0.8 |
| 1 1/2 | 40 | 48.3 | 50.8 | 101.6 | 73 | 72 | 6.4 | 0.8 |
| 2 | 50 | 60.3 | 63.5 | 152.4 | 92 | 91 | 7.9 | 0.8 |
| 2 1/2 | 65 | 73 | 63.5 | 152.4 | 105 | 104 | 7.9 | 0.8 |
| 3 | 80 | 88.9 | 63.5 | 152.4 | 127 | 126 | 9.6 | 0.8 |
| 3 1/2 | 90 | 101.6 | 76.2 | 152.4 | 140 | 139 | 9.6 | 0.8 |
| 4 | 100 | 114.3 | 76.2 | 152.4 | 157 | 156 | 11.2 | 0.8 |
| 5 | 125 | 141.3 | 76.2 | 203.2 | 186 | 185 | 11.2 | 1.6 |
| 6 | 150 | 168.3 | 88.9 | 203.2 | 216 | 215 | 12.7 | 1.6 |
| 8 | 200 | 219.1 | 101.6 | 203.2 | 270 | 269 | 12.7 | 1.6 |
| 10 | 250 | 273.1 | 127 | 254 | 324 | 322 | 12.7 | 1.6 |
| 12 | 300 | 323.9 | 152.4 | 254 | 381 | 379 | 12.7 | 1.6 |
| 14 | 350 | 355.6 | 152.4 | 304.8 | 413 | 411 | 12.7 | 1.6 |
| 16 | 400 | 406.4 | 152.4 | 304.8 | 470 | 468 | 12.7 | 1.6 |
| 18 | 450 | 457.2 | 152.4 | 304.8 | 533 | 531 | 12.7 | 1.6 |
| 20 | 500 | 508 | 152.4 | 304.8 | 584 | 582 | 12.7 | 1.6 |
| 22 | 550 | 559 | 152.4 | 304.8 | 641 | 639 | 12.7 | 1.6 |
| 24 | 600 | 610 | 152.4 | 304.8 | 692 | 690 | 12.7 | 1.6 |
The following information shall be provided to order a stub end:
Stub ends can be ordered with different ends finishing:
| Material Type | Standards & Grades | Characteristics | Applications |
|---|---|---|---|
| Carbon Steel | ASTM A234 WPB, A420 WPL6 | High strength, cost-effective, good weldability | General industrial piping, oil & gas, power generation |
| Stainless Steel | ASTM A403 WP304/304L, WP316/316L | Excellent corrosion resistance, hygienic properties | Chemical processing, food & beverage, pharmaceutical |
| Alloy Steel | ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 | Enhanced strength, high-temperature resistance | High-temperature and high-pressure services |
Butt Weld Fittings
Stainless Steel Fittings
Buttwelding Ends
Japanese Standards
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