Lap join stub end

The Lap joint stub end is the fittings that are used in place of welded flanges when the support of rotating back up flanges is required.

Lap join stub end

Lap Joints also named stub Ends and vanstone flared laps, it is used in place of welded flanges where rotating back up flanges are desired.

Lap join stub end
  • 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.

Lap Joints are consisted of three series.

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
  • Type A & B Stub Ends are made similar to forging pipe fittings such as elbows and tees.
  • Type C Stub Ends are made by customized dimensions.
Benefits of lap joint stub ends

The use of lap joint stub ends has these two advantages:

Reduces the overall cost of the flanged joint

Generally, the lap joint flange is of a lower grade than the material of the stub end and the pipework, thus saving the total weight of high-grade material used for the flanged joint.

Example:

For an SS316 pipe, instead of using a full 316 welding neck flange, a combination of an SS316 stub end and a carbon steel lap joint flange would do the same exact job, but the total weight of SS316 material would be lower, and the cost as well.

Essentially, stub ends allow to minimize the weight of high-grade material in stainless, duplex, and nickel alloy piping, saving costs. Of course, the bigger the diameter and the class of the flanges, the higher the saving!

Facilitates the installation of the flange

The lap joint flange can be rotated on the pipe and simplify the alignment of the bolt holes of the mating flanges

It shall be noted that stud ends are becoming popular also in high-pressure applications (whereas they were used for low-pressure applications only in the past).



There are three different types of stub ends, Type A, B and C. Type A stub ends are machined to fit in a standard lap joint backing flange

We offer stub ends at highly competitive prices.

Lap Joint Stub End – The ‘mated’ pair to a Lap Joint Flange. Stub Ends are Fittings used in place of welded flanges where rotating back up flanges are desired. Stub Ends are typically manufactured by two methods, Type A & Type B and are available in two standard lengths , long (ANSI) or short (MSS) pattern.

Features:
Manufacturing standards of stub end:
Specifications:
Technical Specifications:
Usage:

Petroleum, Chemical, Power, Gas, Metallurgy, Ship-building, Construction, ect.

Lap Joint Stub End

Using stub ends allows sections of the line to be opened for cleaning, inspection, or quick replacement etc, without the need to re-weld.

Specifications: 

管件标准及相关参数:


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