LAP JOINT STUB ENDS pipe fittings supplier manufacturer,contact us to get free quote and sample!
ASME B16.9 Lap joint stub ends are essential pipe fittings used with lap joint flanges to create secure, removable connections in industrial piping systems. A short pipe section with one end butt-welded to the main pipe and the other end formed into a flared lap face, they serve as the sealing surface for flange connections – a cost-effective, flexible alternative to traditional welded flanges.
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Specifications
Sizes: 1/2" NB to 24" NB (custom sizes available).
Thickness: Schedule 5S, 10S, 20S, STD, 40S, XS, XXS, etc..
Standards: ASME/ANSI B16.9, MSS SP-43, ASME B16.28, DIN 2605, GB 12459, JIS 2313.
Patterns: Short (MSS) and Long (ANSI) – available for all schedules and types.
Industrial Applications
Oil & Gas: Refineries, pipelines, offshore facilities – for safe, durable connections in variable pressure/temperature environments.
Chemical Processing: Corrosion-resistant solutions for aggressive media and frequent maintenance needs.
Power Generation: High-temperature, high-strength applications in power plants and petrochemical facilities.
Marine & Aerospace: Nickel alloy and stainless steel LJSE for harsh marine and aerospace environments.
Construction & Water Treatment: Cost-effective carbon steel options for structural and water piping systems.
Why Buy Our Lap Joint Stub Ends?
Compliance: All products meet global industry standards (ASME, ANSI, MSS) for quality and compatibility.
Customization: Tailor materials, sizes, types, and specifications to your exact project needs – no unnecessary costs for off-the-shelf fittings.
Cost Savings: High-quality, durable design reduces maintenance and replacement costs, flexible material pairing cuts upfront expenses
DIMENSIONS OF LAP JOINT STUB ENDS
|
Nominal Pipe Size(NPS) |
DN |
Outside Diameter of Barrel |
Long Pattern Length, F[Notes (3), (4)] |
Short Pattern Length, F[Notes (3), (4)] |
Radius of Fillet, R[Note (5)] |
Diameter of Lap, G[Note (6)] |
|
|
Max. |
Min. |
||||||
|
1/2 |
15 |
22.8 |
20.5 |
76 |
51 |
3 |
35 |
|
3/4 |
20 |
28.1 |
25.9 |
76 |
51 |
3 |
43 |
|
1 |
25 |
35.0 |
32.6 |
102 |
51 |
3 |
51 |
|
1 1/4 |
32 |
43.6 |
41.4 |
102 |
51 |
5 |
64 |
|
1 1/2 |
40 |
49.9 |
47.5 |
102 |
51 |
6 |
73 |
|
2 |
50 |
62.4 |
59.5 |
152 |
64 |
8 |
92 |
|
2 1/2 |
65 |
75.3 |
72.2 |
152 |
64 |
8 |
106 |
|
3 |
80 |
91.3 |
88.1 |
152 |
64 |
10 |
127 |
|
3 1/2 |
90 |
104.0 |
100.8 |
152 |
76 |
10 |
140 |
|
4 |
100 |
116.7 |
113.5 |
152 |
76 |
11 |
157 |
|
5 |
125 |
144.3 |
140.5 |
203 |
76 |
11 |
185 |
|
6 |
150 |
171.3 |
167.5 |
203 |
89 |
13 |
218 |
|
8 |
200 |
222.1 |
218.3 |
203 |
102 |
13 |
270 |
|
10 |
250 |
277.2 |
272.3 |
254 |
127 |
13 |
324 |
|
12 |
300 |
328.0 |
323.1 |
254 |
152 |
13 |
381 |
|
14 |
350 |
359.9 |
354.8 |
305 |
152 |
13 |
413 |
|
16 |
400 |
411.0 |
405.6 |
305 |
152 |
13 |
470 |
|
18 |
450 |
462 |
456 |
305 |
152 |
13 |
533 |
|
20 |
500 |
514 |
507 |
305 |
152 |
13 |
584 |
|
22 |
550 |
565 |
558 |
305 |
152 |
13 |
641 |
|
24 |
600 |
616 |
609 |
305 |
152 |
13 |
692 |
GENERAL NOTES:
- All dimensions are in millimeters.
- Service conditions and joint construction often dictate stub end length requirements. Therefore, the purchaser must specify long or short pattern fitting when ordering.
NOTES:
- Gasket face finish shall be in accordance with ASME B16.5 for raised face flanges.
- The lap thickness T shall not be less than nominal pipe wall thickness.
- When short pattern stub ends are used with larger flanges in Classes 300 and 600, (PN50 & PN110) and with most sizes in Classes 900 (PN150) and higher, and when long pattern stub ends are used with larger flanges in Classes 1500 and 2500, (PN260 AND PN420) it may be necessary to increase the length of the stub ends in order to avoid covering the weld with the flange. Such increases in length shall be a matter of agreement between the manufacturer and purchaser.
- When special facings such as tongue and groove, male and female, etc., are employed, additional lap thickness must be provided and such additional thickness shall be in addition to (not included in) the basic length F.
- These dimensions conform to the radius established for lap joint flanges in ASME B16.5, Pipe Flanges and Flanged Fittings.
- This dimension conforms to standard machined facings shown in ASME B16.5. The back face of the lap shall be machined to conform to the surface on which it seats. Where ring joint facings are to be applied, use dimension K as given in ASME B16.5.
