ASME/ANSI B16.9, ASME B16.28, MSS-SP-43.
Small Sizes: 1/2 inch (15 mm)
Medium Sizes: Up to 24 inches (600 mm)
Large Sizes: Up to 36 inches (900 mm)
Seamless, Welded, & ERW.
Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS.
flat or beveled face, Reducing Lap Joint Stub End, Long Lap Joint Stub End, Short Lap Joint Stub End.
Stainless Steel, Carbon Steel, Alloy Steel, Super Duplex, Duplex Steel, High Nickel Alloys, Copper Nickel.
A Lap Joint Stub End is a short pipe section with a flange at one end, designed to be used with a corresponding lap joint flange. The stub end is typically manufactured with a specific face and end design that fits into the flange, allowing for easy assembly and disassembly. It is generally characterized by its flat or beveled face, which aligns with the lap joint flange. The stub end may also have a specific thickness and dimension to match the pipe and flange specifications.
Manufacturing Lap Joint Stub Ends involves several key steps to ensure high-quality and precision. The process starts with selecting suitable materials, such as carbon steel, stainless steel, or alloy materials, tailored to the specific requirements of the application. The raw material is then cut to the desired length and subjected to forming processes, including rolling or bending, to achieve the required shape. For stub ends that include a flange, the flange face is meticulously machined to match the corresponding lap joint flange. The stub end is then welded to the pipe or attached using other methods as specified.
After the initial fabrication, the lap joint stub end undergoes rigorous quality control measures. This includes dimensional checks, pressure testing, and inspection for any surface defects to ensure compliance with industry standards, such as ASTM or ANSI. The final product is then cleaned, and, if required, coated to prevent corrosion or other damage. Once these quality assurance steps are completed, the lap joint stub end is prepared for shipment, ready for integration into piping systems where it will facilitate efficient and flexible connections.
Installing a Lap Joint Stub End involves first welding or attaching the stub end to the pipe, ensuring a secure and aligned connection. Next, a lap joint flange is bolted onto the stub end, with a gasket placed between them to create a leak-proof seal. The flange allows for easy alignment and adjustment before final tightening. This method provides flexibility in the connection, making it ideal for applications requiring frequent maintenance or modifications.
Type A Lap Joint Stub End features a long taper that provides a smooth transition and precise alignment between the pipe and lap joint flange. This design is ideal for applications requiring exact fitting and alignment, offering flexibility during installation and ensuring a secure, stable connection. It is commonly used in high-pressure systems and industries where ease of maintenance is crucial.
Type B Lap Joint Stub End is characterized by its shorter taper compared to Type A. This design is tailored for applications where space is constrained or where a shorter, more compact connection is needed. The reduced taper allows for easier installation in tight spaces while maintaining compatibility with lap joint flanges. Type B provides a reliable connection in various piping systems, offering the flexibility needed for quick adjustments and ease of maintenance.
Type C Lap Joint Stub End is designed with a standard flange face and a more straightforward taper compared to Type A and Type B. This type provides a conventional connection suitable for a wide range of applications where a standard stub end design is adequate. Type C Lap Joint Stub Ends are used with standard lap joint flanges, making them versatile and widely applicable in various piping systems.
Nominal Size | Outside Diameter of Barrel | Long Pattern Length, F |
Short Pattern Length, F |
Radius of Fillet, R |
Diameter of Lap, G |
|
---|---|---|---|---|---|---|
NPS | Max. mm. in. |
Min. mm. in. |
mm. in. |
mm. in. |
mm. in. |
mm. in. |
1/2 | 22.8 0.896 |
20.5 0.809 |
76 3.00 |
51 2.00 |
3 0.12 |
35 1.38 |
3/4 | 28.1 1.106 |
25.9 1.019 |
76 3.00 |
51 2.00 |
3 0.12 |
43 1.69 |
1 | 35.0 1.376 |
32.6 1.284 |
102 4.00 |
51 2.00 |
3 0.12 |
51 2.00 |
1 1/4 | 43.6 1.716 |
41.4 1.629 |
102 4.00 |
51 2.00 |
5 0.19 |
64 2.50 |
1 1/2 | 49.9 1.965 |
47.5 1.869 |
102 4.00 |
51 2.00 |
6 0.25 |
73 2.88 |
2 | 62.4 2.456 |
59.5 2.344 |
152 6.00 |
64 2.50 |
8 0.31 |
92 3.62 |
2 1/2 | 75.3 2.966 |
72.2 2.844 |
152 6.00 |
64 2.50 |
8 0.31 |
105 4.12 |
3 | 91.3 3.596 |
88.1 3.469 |
152 6.00 |
64 2.50 |
10 0.38 |
127 5.00 |
3 1/2 | 104.0 4.096 |
100.8 3.969 |
152 6.00 |
76 3.00 |
10 0.38 |
140 5.50 |
4 | 116.7 4.593 |
113.5 4.469 |
152 6.00 |
76 3.00 |
11 0.44 |
157 6.19 |
5 | 144.3 5.683 |
140.5 5.532 |
203 8.00 |
76 3.00 |
11 0.44 |
186 7.31 |
6 | 171.3 6.743 |
167.5 6.594 |
203 8.00 |
89 3.50 |
13 0.50 |
216 8.50 |
8 | 222.1 8.743 |
218.3 8.594 |
203 8.00 |
102 4.00 |
13 0.50 |
270 10.62 |
10 | 277.2 10.913 |
272.3 10.719 |
254 10.00 |
127 5.00 |
13 0.50 |
324 12.75 |
12 | 328.0 12.913 |
323.1 12.719 |
254 10.00 |
152 6.00 |
13 0.50 |
381 15.00 |
14 | 359.9 14.170 |
354.8 13.969 |
305 12.00 |
152 6.00 |
13 0.50 |
413 16.25 |
16 | 411.0 16.180 |
405.6 15.969 |
305 12.00 |
152 6.00 |
13 0.50 |
470 18.50 |
18 | 462.0 18.190 |
456.0 17.969 |
305 12.00 |
152 6.00 |
13 0.50 |
533 21.00 |
20 | 514.0 20.240 |
507.0 19.969 |
305 12.00 |
152 6.00 |
13 0.50 |
584 23.00 |
22 | 565.0 22.240 |
558.0 21.969 |
305 12.00 |
152 6.00 |
13 0.50 |
641 25.25 |
24 | 616.0 24.240 |
609.0 23.969 |
305 12.00 |
152 6.00 |
13 0.50 |
692 27.25 |
Dimension | Tolerance | Purpose |
---|---|---|
Outside Diameter of Barrel | ±1.5% of nominal diameter | Ensures proper fit within the flange and consistent wall thickness. |
Long Pattern Length (F) | ±3 mm (±0.12 in) | Guarantees alignment with the flange. |
Short Pattern Length (F) | ±3 mm (±0.12 in) | Ensures proper fit in applications requiring a shorter connection. |
Radius of Fillet (R) | ±1 mm (±0.04 in) | Provides a smooth transition at the weld joint. |
Diameter of Lap (G) | ±1 mm (±0.04 in) | Ensures proper seating against the flange and effective sealing. |
Wall Thickness | ±10% of nominal thickness | Maintains strength and durability of the stub end. |
Concentricity and Straightness | ±1 mm (±0.04 in) over length | Ensures alignment and concentricity with the pipe or flange. |