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What Is Lap Joint Stub End ?

DataTime:[2016-6-3]

What Is Lap Joint Stub End ?

Lap joint stub end also called Lap Joint and Vanstone Flared Lap. It is fitting used in place of welded flangewhere rotating back up flange is desired.


A rotating back up flange seats itself against the back surface of the Stub End. When bolts are added, the clamping action of the bolts presses the rotating back up flange against the back of the Stub End. The gasket surface of the Stub End then presses against a gasket and another gasket surface providing joints like standard flange joints. The seal is made by the gasket surface of the stub end alone, the flange only provides the clamping pressure on the joint.

Lap joint stub ends slide directly over the pipe and are most commonly used with stub end fittings. A pipe is usually welded to the Stub End and the Lap Joint pipe flange is free to rotate around the stub end. The benefit of this is that there will not be any issues with bolt hole alignment. Lap Joint pipe flanges are often used for applications that require frequent dismantling.

Drawing of Lap Joint Stub End
Size: 1/2" - 24"
Types: Type A, Type B, Type C, Type D

Material:
Carbon: SA234 WPB, SA234 WPC,SA42 WPL6, SA42 WPL3, WP1. MSS-SP75 
        WPHY,WPHY 46,WPHY 52,WPHY 56,WPHY 60,WPHY 65, WPHY 70 
Stainless: ASTM/ASME SA403 304,304L ,316, 316L, WP304L, 3 WP316 WP347 (H) ,WP317 (L),WP321.
DIN 1.4301, 1.4306, 1.4401, 1.4571 
JIS SUS304,SUS304, SUS304L, SUS316, SUS316
Alloy: ASTM/ASME SA234 WP12, WP11,WP22, WP5, WP9, WP91.
         ASTM B361 GR.3003-6061, 
         ASTM B366 UNS N04400,N08800, N08825 N1001-N10276-N10665, WPT2-WPT12.
         ASTM 182 F1, F5, F6, F7, F9, F11, F12, F22, F51.
        16MnR Cr5Mo 12Cr1MoV 10CrMo910 15CrMo 12Cr2Mo1, St45.8
Others: Copper, Aluminium,Brass,Titanium, Nickel,Nichrome, Al.Bronze Phosphorous Bronze
Usage: Petroleum, Chemical, Power, Gas, Metallurgy, Ship-building, Construction, ect.
Packing: Plywood Case/ Pallet/ other
Nominal Pipe Size

Outside Diameter at Bevel
Length

Radius of Fillet

Diameter of Lap
A
B
NPS
D
L
R
G
1/2
3/4
1
21.3
26.7
33.4
51
51
51
3.0
3.0
3.0
0.8
0.8
0.8
35
43
51
11/4
11/2
2
42.2
48.3
60.3
51
51
64
5.0
6.0
8.0
0.8
0.8
0.8
64
73
92
21/2
3
31/2
73.0
88.9
101.6
64
64
76
8.0
10.0
10.0
0.8
0.8
0.8
106
127
140
4
5
6
114.3
141.3
168.3
76
76
89
11.0
11.0
13.0
0.8
1.6
1.6
157
185
218

8
10
12

219.1
273.0
323.8
102
127
152
13.0
13.0
13.0
1.6
1.6
1.6
270
324
381
14
16
18
355.6
406.4
457.0
152
152
152
13.0
13.0
13.0
1.6
1.6
1.6
413
470
533
20
22
24
508.0
559.0
610.0
152
152
152
13.0
13.0
13.0
1.6
--
1.6
584
641
692

Minimum lap thickness shall not be less than nominal wall thickness.
Contact faces of stub ends shall have a concentric serration or spiral according to the purchaser's requirements.
These lengths and radius apply for schedule 40s or thinner stainless steel pipes.
Radius of fillet B is only effective to MSS SP-43 lap joint stub ends.

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Address:Longwan District, Wenzhou, Zhejiang Province, China.

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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.