Description
What is Stub End Lap Joint Flange?
A Stub End Lap Joint Flange is a two-part assembly used in piping systems, consisting of a Stub End and a Lap Joint Flange. This combination provides flexibility, easy alignment, and cost-effectiveness, making it ideal for systems requiring frequent disassembly or maintenance.
Key Features:
- Stub End: A short pipe piece with a flared end that acts as the sealing surface.
- Lap Joint Flange: A loose flange that slides over the stub end, making alignment easier.
- Material: Available in stainless steel, carbon steel, alloy steel, and special grades.
- Connection: Used with butt-welded stub ends for secure attachment.
- Flexibility: Allows for easy rotation and bolt alignment in piping systems.
Stub End Lap Joint Flange Dimensions
| Nominal Size | Outside Diameter of Barrel | Long Pattern | Short Pattern | Radius of | Diameter | |
| Length, F | Length, F | Fillet, R | of Lap, G | |||
| NPS | Max. | Min. | mm. | mm. | mm. | mm. |
| mm. | mm. | in. | in. | in. | in. | |
| in. | in. | |||||
| 1/2 | 22.8 | 20.5 | 76 | 51 | 3 | 35 |
| 0.896 | 0.809 | 3 | 2 | 0.12 | 1.38 | |
| 3/4 | 28.1 | 25.9 | 76 | 51 | 3 | 43 |
| 1.106 | 1.019 | 3 | 2 | 0.12 | 1.69 | |
| 1 | 35 | 32.6 | 102 | 51 | 3 | 51 |
| 1.376 | 1.284 | 4 | 2 | 0.12 | 2 | |
| 1 1/4 | 43.6 | 41.4 | 102 | 51 | 5 | 64 |
| 1.716 | 1.629 | 4 | 2 | 0.19 | 2.5 | |
| 1 1/2 | 49.9 | 47.5 | 102 | 51 | 6 | 73 |
| 1.965 | 1.869 | 4 | 2 | 0.25 | 2.88 | |
| 2 | 62.4 | 59.5 | 152 | 64 | 8 | 92 |
| 2.456 | 2.344 | 6 | 2.5 | 0.31 | 3.62 | |
| 2 1/2 | 75.3 | 72.2 | 152 | 64 | 8 | 105 |
| 2.966 | 2.844 | 6 | 2.5 | 0.31 | 4.12 | |
| 3 | 91.3 | 88.1 | 152 | 64 | 10 | 127 |
| 3.596 | 3.469 | 6 | 2.5 | 0.38 | 5 | |
| 3 1/2 | 104 | 100.8 | 152 | 76 | 10 | 140 |
| 4.096 | 3.969 | 6 | 3 | 0.38 | 5.5 | |
| 4 | 116.7 | 113.5 | 152 | 76 | 11 | 157 |
| 4.593 | 4.469 | 6 | 3 | 0.44 | 6.19 | |
| 5 | 144.3 | 140.5 | 203 | 76 | 11 | 186 |
| 5.683 | 5.532 | 8 | 3 | 0.44 | 7.31 | |
| 6 | 171.3 | 167.5 | 203 | 89 | 13 | 216 |
| 6.743 | 6.594 | 8 | 3.5 | 0.5 | 8.5 | |
| 8 | 222.1 | 218.3 | 203 | 102 | 13 | 270 |
| 8.743 | 8.594 | 8 | 4 | 0.5 | 10.62 | |
| 10 | 277.2 | 272.3 | 254 | 127 | 13 | 324 |
| 10.913 | 10.719 | 10 | 5 | 0.5 | 12.75 | |
| 12 | 328 | 323.1 | 254 | 152 | 13 | 381 |
| 12.913 | 12.719 | 10 | 6 | 0.5 | 15 | |
| 14 | 359.9 | 354.8 | 305 | 152 | 13 | 413 |
| 14.17 | 13.969 | 12 | 6 | 0.5 | 16.25 | |
| 16 | 411 | 405.6 | 305 | 152 | 13 | 470 |
| 16.18 | 15.969 | 12 | 6 | 0.5 | 18.5 | |
| 18 | 462 | 456 | 305 | 152 | 13 | 533 |
| 18.19 | 17.969 | 12 | 6 | 0.5 | 21 | |
| 20 | 514 | 507 | 305 | 152 | 13 | 584 |
| 20.24 | 19.969 | 12 | 6 | 0.5 | 23 | |
| 22 | 565 | 558 | 305 | 152 | 13 | 641 |
| 22.24 | 21.969 | 12 | 6 | 0.5 | 25.25 | |
| 24 | 616 | 609 | 305 | 152 | 13 | 692 |
| 24.24 | 23.969 | 12 | 6 | 0.5 | 27.25 | |
Stub End Lap Joint Flange Grades
- Carbon Steel: ASTM A105, ASTM A234 WPB, ASTM A516 Gr. 70
- Stainless Steel: ASTM A182 F304/L, F316/L, F321, F347
- Duplex & Super Duplex Steel: ASTM A182 F51, F53, F55
- Alloy Steel: ASTM A182 F1, F5, F9, F11, F22, F91
- Nickel Alloys: ASTM B564 Inconel 600, 625, 800, 825, Monel 400, Hastelloy C276
Stub End Lap Joint Flange Standards
- ASME/ANSI B16.5 – For flanges up to 24 inches
- ASME B16.47 – For large-diameter flanges (Series A & B)
- MSS-SP-43 – Covers lightweight Stub Ends
- BS 4504, DIN 2642/2643 – European standards
- EN 1092-1 – European flange standard
Application
- Pipelines with Corrosive Fluids
- High-Temperature and High-Pressure Systems
- Food & Beverage Industry
- Water Treatment & Desalination Plants
- Oil & Gas Industry
- Shipbuilding & Marine Applications
- Pharmaceutical & Biotech Industry
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