Butt-welding Short and Long Pattern Lap Joint Stub Ends
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Main Applications of Lap Joint Stub Ends
1.Chemical: Easy maintenance, cost-effective (stainless stub + carbon flange), ideal for corrosive fluids (e.g., acids).
2.Oil & Gas: Quick disassembly for stable-pressure pipelines (e.g., gathering lines, auxiliary systems).
3.Food/Beverage: Hygienic, smooth surfaces for easy cleaning (e.g., production lines).
4.Pharma: Sterility-compliant, frequent cleaning (e.g., purified water pipes).
5.Marine: Compact, vibration-resistant (e.g., fuel/cooling systems).
Specifications of Lap Joint Stub Ends
Nominal Size |
Outside Diameter |
Outside Diameter |
Length |
Radius of Fillet |
Diameter of Lap |
||||
DN |
NPS |
OD |
Max. |
Min. |
Long Type |
Short Type |
A |
B |
G |
15 |
1/2 |
21.3 |
22.8 |
20.5 |
76 |
51 |
3 |
0.8 |
35 |
20 |
3/4 |
26.7 |
28.1 |
25.9 |
76 |
51 |
3 |
0.8 |
43 |
25 |
1 |
33.4 |
35.0 |
32.6 |
102 |
51 |
3 |
0.8 |
51 |
32 |
1-1/4 |
42.2 |
43.6 |
41.4 |
102 |
51 |
5 |
0.8 |
64 |
40 |
1-1/2 |
48.3 |
49.9 |
47.5 |
102 |
51 |
6 |
0.8 |
73 |
50 |
2 |
60.3 |
62.4 |
59.5 |
152 |
64 |
8 |
0.8 |
92 |
65 |
2-1/2 |
73.0 |
75.3 |
72.2 |
152 |
64 |
8 |
0.8 |
105 |
80 |
3 |
88.9 |
91.3 |
88.1 |
152 |
64 |
10 |
0.8 |
127 |
90 |
3-1/2 |
101.6 |
104.0 |
100.8 |
152 |
76 |
10 |
0.8 |
140 |
100 |
4 |
114.3 |
116.7 |
113.5 |
152 |
76 |
11 |
0.8 |
157 |
125 |
5 |
141.3 |
114.3 |
140.5 |
203 |
76 |
11 |
1.6 |
186 |
150 |
6 |
168.3 |
171.3 |
167.5 |
203 |
89 |
13 |
1.6 |
216 |
200 |
8 |
219.1 |
222.1 |
218.3 |
203 |
102 |
13 |
1.6 |
270 |
250 |
10 |
273.1 |
277.2 |
272.3 |
254 |
127 |
13 |
1.6 |
324 |
300 |
12 |
323.9 |
328.0 |
323.1 |
254 |
152 |
13 |
1.6 |
381 |
350 |
14 |
355.6 |
359.9 |
354.8 |
305 |
152 |
13 |
1.6 |
413 |
400 |
16 |
406.4 |
411.0 |
405.6 |
305 |
152 |
13 |
1.6 |
470 |
450 |
18 |
457.2 |
462.0 |
456.4 |
305 |
152 |
13 |
1.6 |
533 |
500 |
20 |
508.0 |
514.0 |
507.2 |
305 |
152 |
13 |
1.6 |
584 |
550 |
22 |
558.8 |
565.0 |
558.0 |
305 |
152 |
13 |
1.6 |
641 |
600 |
24 |
609.6 |
616.0 |
608.8 |
305 |
152 |
13 |
1.6 |
692 |
DIMENSIONS COMPLY WITH MSS SP-43 AND ASME B16.9 STANDARDS | |||||||||
Advantages of Lap Joint Stub Ends
1. Easy Installation & Removal: Simplifies pipeline maintenance, inspection, and cleaning.
2. Cost Efficiency: Allows pairing with different flange materials (e.g., corrosion-resistant stub ends with carbon steel flanges) to reduce costs.
3. Wide Applicability: Suitable for medium/low-pressure, non-critical pipelines, accommodating vibration and minor displacement.
4. Hygienic Design: Smooth internal surface meets sanitary requirements for food, pharmaceutical, and other hygiene-sensitive industries.
