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» Flange & Fitting » ASME B16.9 Lap Joint Stub End

ASME B16.9 Lap Joint Stub End

August 27, 2020

Technical Drawings

Drawing of Lap Joint Stub End

Standard drawing of ASME B16.9 Lap Joint Stub End.

The lap joint stub end is required when attach the lap-joint flange to the piping system. The stub end and lap-joint flange assembly are used mainly in piping systems that necessitate frequent dismantling for inspection or routine maintenance. It is also used in the erection of large diameter or hand-to-adjust piping configurations because of the assembly’s quick bolt hole alignment. ASME B16.9 has classified two types of lap joint stub ends: long pattern and short patterm.

*NOTES:
(1) Gasket face finish shall be in accordance with ASME B16.5 for raised-face flanges.
(2) The lap thickness, T, shall not be less than nominal pipe wall thickness.

Dimensions

NPSO.D Max
mm
inch
O.D Min
mm
inch
F
mm
inch
1/222.8
0.896
20.5
0.809
76
3.00
3/428.1
1.106
25.9
1.019
76
3.00
135.0
1.376
32.6
1.284
102
4.00
1-1/443.6
1.716
41.4
1.629
102
4.00
1-1/249.9
1.965
47.5
1.869
102
4.00
262.4
2.456
59.5
2.344
152
6.00
2-1/275.3
2.966
72.2
2.844
152
6.00
391.3
3.596
88.1
3.469
152
6.00
3-1/2104.0
4.096
100.8
3.969
152
6.00
4116.7
4.593
113.5
4.469
152
6.00
5144.3
5.683
140.5
5.532
203
8.00
6171.3
6.743
167.5
6.594
203
8.00
8222.1
8.743
218.3
8.594
203
8.00
10277.2
10.913
272.3
10.719
254
10.00
12328.0
12.913
323.1
12.719
254
10.00
14359.9
14.170
354.8
13.969
305
12.00
16411.0
16.180
405.6
15.969
305
12.00
18462.0
18.190
456.0
17.969
305
12.00
20514.0
20.240
507.0
19.969
305
12.00
22565.0
22.240
558.0
21.969
305
12.00
24616.0
24.240
609.0
23.969
305
12.00

*NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel; F: Long Pattern Length[Note (3)(4)].

*NOTES:
(3)When short pattern stub endsare used with larger flanges in Classes300 and 600, with mostsizes in Classes 900 and higher, and when long pattern stub ends are used with larger flanges in Classes 1500 and 2500, it may be necessary to increase the length of the stub ends in order to avoid covering the weld with the fiange. Such increases in length shall be a matter of agreement between the manufacturer and purchaser.
(4)When special facings such as tongue and groove or male and female are employed additional lap thickness must be provided and such additional thickness shall be in addition to (not included in) the basic length, F.

NPSF
mm
inch
R
mm
inch
G
mm
inch
1/251
2.00
3
0.12
35
1.38
3/451
2.00
3
0.12
43
1.69
151
2.00
3
0.12
51
2.00
1-1/451
2.00
5
0.19
64
2.50
1-1/251
2.00
6
0.25
73
2.88
264
2.50
8
0.31
92
3.62
2-1/264
2.50
8
0.31
105
4.12
364
2.50
10
0.38
127
5.00
3-1/276
3.00
10
0.38
140
5.50
476
3.00
11
0.44
157
6.19
576
3.00
11
0.44
186
7.31
689
3.50
13
0.50
216
8.50
8102
4.00
13
0.50
270
10.62
10127
5.00
13
0.50
324
12.75
12152
6.00
13
0.50
381
15.00
14152
6.00
13
0.50
413
16.25
16152
6.00
13
0.50
470
18.50
18152
6.00
13
0.50
533
21.00
20152
6.00
13
0.50
584
23.00
22152
6.00
13
0.50
641
25.25
24152
6.00
13
0.50
692
27.25

*NPS: Nominal Pipe Size; F: Short Pattern Length[Note (3)(4)]; R: Radius of Fillet[Note (5)]; G: Diameter of Lap[Note (6)].

*NOTES:
(5)These dimensions conform to the radius established for lap joint flanges in ASME B16.5.
(6)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 sits. Where ring joint facings are to be applied, use dimension K as given in ASME B16.5.

ASME B16.9 Butt Welding Fittings
Elbow L/RReducing ElbowReturn L/R
Elbow S/RReturn S/R3D Elbow
Tee & CrossReducing TeeReducing Cross
Stub EndCapReducer
End BevelToleranceWall Thickness

*Click to view dimensions of other ASME B16.9 standard fittings.

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