Long Pattern Stub End - Butt-Weld Pipe Fitting
A long pattern stub end has an extended straight section between the weld end and the lap face. The extra length simplifies welding and alignment, particularly on larger diameters and thicker-wall pipe, saving valuable erection time. Manufactured to BS EN 10253-2 and ASME B16.9, the long pattern is the standard choice for heavy-wall and large-bore services.
Each stub end is bevelled to ASME B16.25 for full-penetration butt welding and supplied with heat numbers and material test certificates for full traceability through the supply chain.
Standards & Materials
Produced in accordance with BS EN 10253-2 and ASME B16.9 in carbon and stainless steel grades suitable for UK process and energy pipework.
| Attribute | Specification |
|---|---|
| Manufacturing Standard | BS EN 10253-2 / ASME B16.9 |
| Carbon Steel | ASTM A234 WPB |
| Stainless Steel | ASTM A403 WP304/304L/316/316L |
| Special Grades | Duplex & Super Duplex (UNS S31803 / S32205 / S32750), Alloy 20, Inconel 625 / 825, Monel 400, Hastelloy C-276 - available on request |
| Fabrication | Seamless or welded |
| Test Pressure | Up to 1500 psi |
| Pattern | Long pattern per ASME B16.9 |
Dimensions & Sizes
Available in long pattern form from 1/2" (DN15) to 24" (DN600) in schedules 10, 40 and 80. The table below gives the lap face outer diameter (G), long pattern face length (F) and Schedule 40 wall thickness for representative sizes, to ASME B16.9.
| Nominal Size | DN | Lap Face OD G (mm) | Length F (mm) | SCH 40 Wall (mm) |
|---|---|---|---|---|
| 1" | 25 | 35 | 76 | 3.38 |
| 2" | 50 | 64 | 76 | 3.91 |
| 3" | 80 | 89 | 76 | 5.49 |
| 4" | 100 | 114 | 76 | 6.02 |
| 6" | 150 | 168 | 76 | 7.11 |
| 8" | 200 | 219 | 76 | 8.18 |
Performance & Benefits
The extended body of a long pattern stub end provides additional clearance for welding equipment and acts as a heat sink, protecting the machined lap face from weld distortion. The extra straight length also simplifies fit-up during orbital welding and gives the welder greater access for manual welds on site. It is the preferred pattern for large-diameter, heavy-wall and critical-service applications.
Typical Applications
Used across UK process and energy installations where the extended body provides a convenient heat sink and simplifies fit-up during orbital welding. Commonly specified in petrochemical process piping, power-station feedwater lines, refinery heat exchanger connections and heavy-wall cryogenic services.
Quality Assurance & Traceability
Every fitting is manufactured to BS EN 10253-2 and ASME B16.9 and supplied with full material traceability and EN 10204 Type 3.1 test certificates. Heat numbers are recorded throughout production to support inspection, QA and UK project-compliance requirements.
Supply & Delivery
Stocked at our Sheffield, UK facility and delivered nationwide across England, Scotland and Wales. We offer fast dispatch from stock with tracked UK delivery to site, and next-day options for common sizes.
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Which sizes and schedules are available?
Available from ½" (DN15) to 24" (DN600) in schedule 10, 40 and 80, in both metric and imperial sizes to suit UK installations.
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Can you provide material certificates?
Yes. Material test certificates and full traceability documentation are available with every order, to project and quality-management requirements.
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What is the difference between long pattern and short pattern stub ends?
Long pattern stub ends have a longer straight body (F dimension) between the weld end and the lap face compared to short pattern. The extended length provides more clearance for welding equipment, acts as a heat sink and simplifies fit-up. Short pattern stub ends have a more compact body and are used where space is limited.
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Do you deliver across the UK?
We deliver nationwide throughout England, Scotland and Wales, with fast dispatch from stock and tracked deliveries to site.