Asme b16.25 Buttwelding Ends
Asme b16.25 Buttwelding Ends
Asme b16.25 Buttwelding Ends
A N
A M E R I C A N A T I O N A S
L T A N D A R D
BUTTWElOlNG EMDS
ASME B16.25-1NU7
The 1997 edition of this Standard is being issued with an automatic addenda
subscription service. The use of an addenda allows revisions made in
response to public review comments or committee actions to be published
as necessary; revisions published in addenda will become effective
6 months
after the Date of Issuance of the addenda. The next edition of this Standard
is scheduled for publication in 2002.
FOREWORD
(This Foreword is not part of ASME 816.25-1997.)
. ..
111
OFFICERS
W. N. McLean, Chair
R. A. Schmidt, Vice Chair
K. Ciciora, Secretary
COMMllTEE PERSONNEL
W. Ballis, Consultant, Columbus, Ohio
R. R. Brodin, Fisher Controls International, Inc., Marshalltown, Iowa
K. Ciciora, ASME, New York, New York
M.A. Clark, NIBCO, Inc., Elkhart, Indiana
A. Cohen, Copper Development Association, New York, New York
W. C. Farrell, Jr., Consultant, Birmingham, Alabama
D. R. Frikken, Monsanto Co., St. Louis, Missouri
M. W. Garland, Frick Company, Waynesboro, Pennsylvania
J. C. Inch, Mueller Refrigeration Products Co., Hartsville, Tennessee
G. A. Jolly, Vogt Valve Co., Louisville, Kentucky
W. G. Knecht, Consultant, Williamsport, Pennsylvania
R. Koester, The William Powell Co., Cincinnati, Ohio
W. N. McLean, Newco Valves, Palos Park, Illinois
R. A. Schmidt, Ladish Co., Russellville, Arkansas
W. M. Stephan, Flexitallic, Inc., Pennsauken, New Jersey
T. F. Stroud, Ductile Iron Pipe Research Association, Birmingham, Alabama
R. E. White, Richard E. White & Associates, South Bend, Indiana
0. A. Williams, Southern Company Services, Birmingham, Alabama
L. A. Willis, Dow Chemical Co., Freeport, Texas
W. R. Worley, Union Carbide Corp., South Charleston, West Virginia
PERSONNEL OF SUBCOMMllTEE F
AND WELDING FITTINGS
- STEEL THREADED
CONTENTS
Foreword .......................................................................
Committee Roster ...............................................................
...
111
Scope .............................................................
Welding Bevel
Design
............................................
Tolerances ........................................................
Maximum
Envelope
for Welding End Transitions ....................
Weld
Bevels
for Wall Thickness Not Over 22 mrn (0.88 in.) . . . . . . . . .
Weld
Bevel
Details for Wall Thickness Over 22 mm (0.88 in.) .......
Weld
Bevel
Details for GTAW
Root
Pass
[Wall Thickness Over
3 mm (0.12 in.) to 10 mm (0.38 in.), Inclusive] . . . . . . . . . . . . . . . . . . .
Weld
Bevel
Details for GTAW
Root
Pass
[Wall Thickness Over
10 mm (0.38 in.) to 25 mm (1.0 in.), Inclusive] . . . . . . . . . . . . . . . . . . .
Weld
Bevel
Details for GTAW
Root
Pass
[Wall Thickness Over 25 mm (1.0 in.)] ...........................
2
3
4
Figures
1
2
3
4
6
Table
.....................................
Dimensions of Welding
Ends
Annexes
A
B
C
Inch Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
7
8
11
15
17
SPECIAL NOTE:
The interpretations to ASME B16.25 are included in this Edition as a separate section for the users convenience.
This section. however.is notpartofthe
Standard.
vii
ASME 816.25-1997
BUTTWELDING ENDS
1 SCOPE
1.1 General
3.1Bevelsfor
ASME 616.25-1997
BUTTWELDING ENDS
Component or Fitting
[Note
(5)l
-----I
Inside
2t,in
transitionregion
NOTES:
(1) The value of t m i n is whichever of the following is applicable:
(a) the minimum ordered wall thickness of the pipe;
(b) 0.875 times the nominal wall thickness of pipe ordered to a pipe schedule wall thickness that has an under-tolerance of 12.596;
(c) the minimum ordered wall thickness of the cylindrical welding end of a component or fitting (or the thinner of the two) whenthe
joint is between two components.
(2) The maximum thickness at the end of the component is:
(a) the greater of tmin + 4 m m (0.16 in.) or 1.15tmin when ordered on a minimum wall basis;
om
ordered on a nominal wall basis.
(b) the greater of tmin + 4 mm (0.16 in.) or l.lOtnwhen
(3) Weld bevel shown is for illustration only.
(4) The weld reinforcement permitted by applicable code may lie outside the maximum envelooe.
(5)Where transitions using maximum slope do notintersect inside or outside surface, as shown by phantom outlines, maximum slopes
shown or alternate radii shall be used.
BUTTWELDING ENDS
---
ASME B16.25-1997
[Note (1)l
1.6 20.8
(0.06 20.03)
---J
---1
(b)Welding
End Detail for
Joint
Using
Without Backing
Ring
Split
--.
[Note (2)1
(0.06 20.03)
+0.25 - 0
GENERAL NOTES:
(a) Broken lines denote maximum envelope for transitions from welding bevel and root
face into body of component.
See Fig. 1 for details.
(b) See Section 5 for tolerances other than those given these
in
sketches.
(C) Purchase order must specify contour of any backing ring tobe used.
(d) Linear dimensions are in millimeters with inchvalues in parentheses.
NOTES:
(1) Internal surface may be as-formed or machined for dimension 6 at root face. Contour within the envelope shallbe in accordance
with Section 2.
(21 Intersections should be slightly rounded,
FIG. 2 WELD BEVELS FOR WALL THICKNESS NOT OVER 22 mm 10.88 in.)
3
COPYRIGHT American Society of Mechanical Engineers
Licensed by Information Handling Services
ASME 816.251997
-
It
---
10 deg t 1 deg
'\
4 r-
BUTlWELDING ENDS
10deg t l d e g
(\ \
(0.75 20.06)
1.6 t0.8
(0.06 20.03)
(0.06 t0.03)
[Note (1)l
--- J
13(0.5) min
---
--
10 deg deg
21
10deg
21deg
[Note (2)]
1
[Note (2)l
\ I
1.6 t0.8
(0.06 20.03)
19 22
(0.75t0.06)
,J
13(0.5) min
(C)
+0.25 - 0
(+0.010 - 0)
+0.25 - 0
(+0.010 - 0)
GENERAL NOTES:
(a) Broken lines denote maximum envelope for transitions from welding groove and root
face into body of components.
See Fig. 1 for details.
(b) See Section 5 for tolerances other than those givenin these sketches.
(c) Purchase order must specify contour of any backing ring to be used.
( d l Linear dimensions are in millimeters withinch values in Darentheses.
NOTES:
(1) Internal surface may be as-formed or machined for dimension 8 at root face. Contour within the envelope shall be in accordance
with Section 2.
(2) Intersections should be slightly rounded.
22 mm (0.88 in.)
ASME B16.25-1997
BUiTWELDlNG ENDS
t
1.6 20.8
(0.06 +0.03)
GENERAL NOTES:
(a) This detail applies for gas tungsten arc welding (GTAW) of
the root pass where nominal wall thickness is over
3 m m (0.12 in.) t 3 10 m m (0.38in.) inclusive.
(b) Linear dimensions are in millimeters with inch values in
parentheses.
WELDING END
4.1 General
Preparation of the inside diameter attheend
of a
component shall be in accordance with one of the
following, as specified by the purchaser.
(a) Components to be welded without
backing rings
shall meet the requirements of the standard or specification for the component.
(b) Components to be welded using split or noncontinuous backing rings shall be contoured with a cylindrical surface atthe end as shown in Fig.2, sketch (b)
andFig. 3, sketch (b). If the backingring contour is
other than rectangular, details mustbe furnished by
the purchaser.
(c) Components to be welded using solid or continuous backing rings shall be contoured with a cylindrical
or tapered surface at the end asspecified
by the
purchaser. End preparation is illustrated in Fig. 2, sketch
(c) andFig.3, sketch (c) for rectangular ends and in
Fig. 2, sketch (d) and Fig. 3, sketch (d) for tapered ends.
(d) Components to
beweldedusing
consumable
insert rings or GTAW root pass shall be contoured
with a cylindrical surface at the end as shown in Figs.
4, 5, and 6.
where
0.79
(0.031) = minus tolerance on O.D. of pipe, mm
(in.), as covered by ASTM specifications
havingthemore restrictive requirements
suchas A 106, A 335, etc.
1.75 = minimalwall of 871/2% of nominalwall
(permitted by ASTM specification having
the more restrictive requirements such as
A 106, A 335, etc.) multiplied by 2 to
convert into terms of diameter
t = nominal wall thickness of pipe, mm (in.)
4.2 Dimension C
- 0.79 -
ASME 816.25-1997
--
i\
BUTWELDING ENDS
--
20 deg 22.5
deg
i2.5deg
20deg
+- 0 to 2 (0.06)
5(0.19) R
2 i0.4
[Note (1)l
30
--J
deg
L??!!fl
f0max
5(0.19) min
'I
+0.25
(4.010
- 1.02
- 0.040)
--J
5(0.19) min
Type B
rLPe A
GENERAL NOTES:
(a) This detail applies for gas tungsten arc welding (GTAW) of the root pass where nominal wall thickness is over 10 mm (0.38in.) to
25 mm ( 1.0 in.) inclusive.
(b) Broken lines denote maximum envelope for transitions from welding groove and land into body of component. See Fig. 1 for details.
(c) See Section 5 for tolerances other than those given in these sketches.
(d) Linear dimensions are in millimeters with inch values in parentheses.
NOTE:
(1) Inside corners should be slightly rounded.
0.25
(0.010) = plus
machining
tolerance
on
Bore
mm (in.)
C,
5.1 Dimension B
4.3 Exceptions
(a) For pipe or tubingvaryingfromthe
ASTM A
106 and A 335 types,having different wall thickness
and/or outside diameter tolerances (suchas
forged
andboredpipe),theforegoingformulas
may be
inapplicable.
(b) For components in smaller sizes and lower schedule numbers, it may be necessary to deposit weld metal
on the inside diameter or use thicker wall materials in
order to machine thebackingringwhilemaintaining
requiredwall thickness. This condition may also arise
when using material whose nominal dimensions indicate
sufficient metal but whose actual inside diameter (I.D.),
considering tolerances, is large enough to require additional metal.
ASME 016.25-1997
BUTTWELDING ENDS
-1
-1
10 deg +1 dag
'
\.
kldeg
'3(0.12)
10deg
'.
\ + +0 to 2 (0.06)
20 deg 4 5 deg
19 t o 25
(0.75 to 1.00)
19 t o 25
(0.75 to 1.00)
Ir
--J
(+0.010-0.040)
,J
5(0.19) rnin
GENERAL NOTES:
(a) This detail applies forgas tungsten arc welding (GTAW) of root pass where nominal wallthickness is greater than 25 rnrn (1.0 in.).
(b) Broken lines denote maximum envelope for transitions from welding groove and land into body of component.
See Fig. 1 for details.
(c) See Section 5 for tolerances other than those givenin these sketches.
Id) Linear dimensions are in millimeters with inchvalues in parentheses.
NOTE:
ASME 816.25-1997
BUTTWELDING ENDS
Cast Steel
Valves,
A [Note (211
C [Note (311
73.0
73.0
73.0
73.0
75
75
75
75
62.5
59
54
45
62.93
59.69
55.28
47.43
5.16
7.01
9.53
14.02
xxs
88.9
88.9
88.9
88.9
91
91
91
91
78
73.5
66.5
58.5
78.25
74.53
68.38
61.19
5.49
7.62
11.13
15.24
80
101.6
101.6
105
105
90
85.5
90.52
86.42
5.74
8.08
114.3
1 14.3
1 14.3
1 14.3
114.3
117
117
117
117
117
102
97
92
87.5
80
102.73
98.28
93.78
89.65
83.30
6.02
8.56
11.13
13.49
17.12
40
80
120
160
141.3
141.3
141.3
141.3
141.3
144
144
144
144
144
128
122
116
109.5
103
128.80
123.58
118.04
112.47
106.92
6.55
9.53
12.70
15.88
19.05
40
80
120
160
168.3
168.3
168.3
168.3
168.3
172
172
172
172
172
154
146.5
140
132
124.5
154.82
148.06
142.29
135.31
128.85
7.1 1
10.97
14.27
18.26
21.95
40
60
80
100
120
140
160
219.1
219.1
219.1
219.1
219.1
219.1
219.1
219.1
223
223
223
223
223
223
223
223
203
198.5
193.5
189
182.5
178
174.5
173
203.75
200.02
195.84
191.65
186.11
181.98
179.16
177.79
8.18
10.31
12.70
15.09
18.26
20.62
22.23
23.01
250
40
60
80
100
120
140
160
273.0
273.0
273.0
273.0
273.0
273.0
273.0
278
278
278
278
278
278
278
254.5
247.5
243
236.5
230
222
216
255.74
249.74
245.55
240.01
234.44
227.51
221.95
9.27
12.70
15.09
18.26
2 1.44
25.40
28.58
300
STD
40
323.8
323.8
323.8
323.8
329
329
329
329
305
303
298.5
295
306.08
304.72
300.54
297.79
9.53
10.31
12.70
14.27
Nominal
Pipe Size
[Note
(DN)
65
Schedule
No.
(1)l
40
80
160
xxs
80
90
100
80
160
80
120
160
xxs
125
xxs
150
xxs
200
xxs
xs
60
ASME 816.25-1997
B U W E L D I N G ENDS
300
350
Schedule
No.
(111
Wrought or
Fabricated
Components,
A [Note (111
Cast Steel
Valves,
A [Note (211
C [Note (311
100
120
140
160
323.8
323.8
323.8
323.8
323.8
329
329
329
329
329
289
281
273
266.5
257
292.17
285.24
278.31
272.75
264.45
17.48
21.44
25.40
28.58
33.32
355.6
355.6
355.6
355.6
355.6
355.6
355.6
355.6
355.6
362
362
362
362
362
362
362
362
362
336.5
333.5
330
325.5
317.5
308
300
292
284
337.88
335.08
332.34
328.15
321.22
312.86
305.93
299.00
292.07
9.53
11.13
12.70
15.09
19.05
23.83
27.79
31.75
35.71
STD
40
xs
60
80
100
120
140
160
400
STD
406.4
406.4
406.4
406.4
406.4
406.4
406.4
406.4
413
413
413
413
413
413
413
413
387.5
381
373
363.5
354
344.5
333.5
325.5
388.68
383.14
376.21
367.84
359.53
351.18
341.43
334.50
9.53
12.70
16.66
21.44
26.19
30.96
36.53
40.49
450
STD
457.2
457.2
457.2
457.2
457.2
457.2
457.2
457.2
457.2
464
464
464
464
464
464
464
464
464
438
432
428.5
419
409.5
398.5
387.5
378
366.5
439.48
433.94
431.19
422.82
414.46
404.78
395.03
386.77
376.99
9.53
12.70
14.27
19.05
23.83
29.36
34.93
39.67
45.24
508.0
508.0
508.0
508.0
508.0
508.0
508.0
508.0
508.0
516
516
516
516
516
516
516
516
516
489
482.5
478
467
455.5
443
432
419
408
490.28
484.74
480.55
470.88
461.13
450.02
440.29
429.17
419.44
9.53
12.70
15.09
20.62
26.19
32.54
38.10
44.45
50.01
558.8
558.8
558.8
558.8
567
567
567
567
539
533
514
501
541.08
535.54
518.86
507.75
9.53
12.70
22.23
28.58
40
60
80
100
120
140
160
xs
40
60
80
100
120
140
160
500
STD
xs
40
60
80
100
120
140
160
550
STD
xs
60
80
ASME B16.25-1997
BUTTWELDING ENDS
Schedule
No.
(111
Wrought or
Fabricated
Components,
A [Note (111
Cast Steel
Valves,
A [Note (211
C [Note (3J1
120
140
160
558.8
558.8
558.8
558.8
567
567
567
567
488.5
476
463
450.5
496.63
485.52
474.41
463.30
34.93
41.28
47.63
53.98
100
120
140
160
ao
609.6
609.6
609.6
609.6
609.6
609.6
609.6
609.6
609.6
609.6
619
619
619
619
619
619
619
619
619
619
590.5
584
581
574.5
560.5
547.5
532
517.5
505
490.5
59
1.88
586.34
583.59
577.97
565.49
554.38
540.49
528.03
516.91
504.37
9.53
12.70
14.27
17.48
24.61
30.96
38.89
46.02
52.37
59.54
650
10
20
660.4
660.4
670
670
645.5
635
645.50
637.14
7.92
12.70
700
10
20
30
711.2
711.2
711.2
721
721
721
695.5
686
679.5
696.30
687.94
682.37
7.92
12.70
15.88
750
10
20
30
762.0
762.0
762.0
772
772
772
746
736.5
730
747.10
738.74
733.17
7.92
12.70
15.88
800
10
20
30
40
812.8
812.8
812.8
812.8
825
825
825
825
797
787.5
781
778
797.90
789.54
783.97
781.17
7.92
12.70
15.88
17.48
10
20
30
40
863.6
863.6
863.6
863.6
876
876
876
876
848
838
832
828.5
848.70
840.34
834.77
831.97
7.92
12.70
15.88
17.48
20
30
40
914.4
914.4
914.4
914.4
927
927
927
927
898.5
889
882.5
876.5
899.50
891.14
885.57
880.02
7.92
12.70
15.88
19.05
Nominal
Pipe Size
[Note
(DNI
550
600
STD
xs
30
40
60
900
GENERAL NOTES:
(a) Dimensions are in millimeters.
(b) See Section 5 for tolerances.
NOTES:
(1) Letter designations signify:
(a) STD = standard wall thickness
(b) XS = extra-strong wall thickness
(c) XXS = double extra-strong wall thickness
(2)The diameters listed are not requirements. They are provided for the convenience of the user.
(3)Internal machining for continuous backing rings for
sizes DN 50 and smaller is not contemplated.
dimension for sizes not listed.
10
ASME 816.25-1997
BUTTWELDING ENDS
ANNEX A
INCH TABLE
(This Annex is an integral part of ASME B16.25 and is placed after the main text for convenience.)
ASME B16.25-1997
BUTTWELDING ENDS
TABLE A I
Nominal
Pipe Size
2 72
Wrought or
Fabricated
Components,
Cast Steel
Valves,
40
80
160
2.88
2.88
2.88
2.88
2.96
2.96
2.96
2.96
2.469
2.323
2.125
1.771
2.479
2.351
2.178
1.868
0.203
0.276
0.375
0.552
40
80
160
xxs
3.50
3.50
3.50
3.50
3.59
3.59
3.59
3.59
3.068
2.900
2.624
2.300
3.081
2.934
2.692
2.409
0.216
0.300
0.438
0.600
40
80
4.00
4.00
4.12
4.12
3.548
3.364
3.564
3.402
0.226
0.318
40
80
120
160
4.50
4.50
4.50
4.50
4.50
4.62
4.62
4.62
4.62
4.62
4.026
3.826
3.624
3.438
3.152
4.044
3.869
3.692
3.530
3.279
0.237
0.337
0.438
0.531
0.674
40
80
120
160
5.56
5.56
5.56
5.56
5.56
5.69
5.69
5.69
5.69
5.69
5.047
4.813
4.563
4.313
4.063
5.070
4.866
4.647
4.428
4.209
0.258
0.375
0.500
0.625
0.750
40
80
120
160
6.62
6.62
6.62
6.62
6.62
6.78
6.78
6.78
6.78
6.78
6.065
5.761
5.501
5.187
4.897
6.094
5.828
5.600
5.326
5.072
0.280
0.432
0.562
0.719
0.864
40
60
80
100
120
140
160
8.62
8.62
8.62
8.62
8.62
8.62
8.62
8.62
8.78
8.78
8.78
8.78
8.78
8.78
8.78
8.78
7.981
7.813
7.625
7.437
7.187
7.001
6.875
6.813
8.020
7.873
7.709
7.544
7.326
7.163
7.053
6.998
0.322
0.406
0.500
0.594
0.719
0.812
0.875
0.906
40
60
80
100
120
140
160
10.75
10.75
10.75
10.75
10.75
10.75
10.75
10.94
10.94
10.94
10.94
10.94
10.94
10.94
10.020
9.750
9.562
9.312
9.062
8.750
8.500
10.070
9.834
9.670
9.451
9.232
8.959
8.740
0.365
0 500
0.594
0.719
0.844
1.000
1.125
STD
40
12.75
12.75
12.75
12.75
12.97
12.97
12.97
12.97
12.000
11.938
11.750
11.626
12.053
11.999
11.834
11.725
0.375
0.406
0.500
0.562
Schedule
No.
xxs
3
3'/2
4
xxs
5
xxs
6
xxs
8
xxs
10
12
xs
60
12
BUTTWELDING ENDS
ASME 816.25-1997
TABLE A I
Schedule
No.
[Note ( I ) ]
Wrought or
Fabricated
Components,
A [Note ( I ) ]
Cast Steel
Valves,
A [Note (211
C [Note (311
12
80
100
120
140
160
12.75
12.75
12.75
12.75
12.75
12.97
12.97
12.97
12.97
12.97
11.374
1 1.062
10.750
10.500
10.126
11.505
1 1.232
10.959
10.740
10.413
0.688
0.844
1.ooo
1.125
1.312
14
STD
40
80
100
120
140
160
14.00
14.00
14.00
14.00
14.00
14.00
14.00
14.00
14.00
14.25
14.25
14.25
14.25
14.25
14.25
14.25
14.25
14.25
13.250
13.124
13.000
12.812
12.500
12.124
11.812
1 1.500
11.188
13.303
13.192
13.084
12.920
12.646
12.318
12.044
11.771
11.498
0.375
0.438
0.500
0.594
0.750
0.938
1.094
1.250
1.406
16
STD
40
60
80
100
120
140
160
16.00
16.00
16.00
16.00
16.00
16.00
16.00
16.00
16.25
16.25
16.25
16.25
16.25
16.25
16.25
16.25
15.250
15.000
14.688
14.312
13.938
13.562
13.124
12.812
15.303
15.084
14.811
14.482
14.155
13.826
13.442
13.170
0.375
0.500
0.656
0.844
1.031
1.219
1.438
1.594
18
STD
18.00
18.00
18.00
18.00
18.00
18.00
18.00
18.00
18.00
18.28
18.28
18.28
18.28
18.28
18.28
18.28
18.28
18.28
17.250
17.000
16.876
16.500
16.124
15.688
15.250
14.876
14.438
17.303
17.084
16.975
16.646
16.318
15.936
15.553
15.225
14.842
0.375
0.500
0.562
0.750
0.938
1.156
1.375
1.562
1.781
20.00
20.00
20.00
20.00
20.00
20.00
20.00
20.00
20.00
20.31
20.31
20.31
20.31
20.31
20.31
20.31
20.31
20.31
19.250
19.000
18.812
18.376
17.938
17.438
17.000
16.500
16.062
19.303
19.084
18.920
18.538
18.155
17.717
17.334
16.896
16.513
0.375
0.500
0.594
0.812
1.031
1.281
1.500
1.750
1.969
22.00
22.00
22.00
22.00
22.34
22.34
22.34
22.34
2 1.250
2 .ooo
1
20.250
19.750
21.303
2 1.084
20.428
19.990
0.375
0.500
0.875
1.125
Nominal
Pipe Size
(NPS)
xs
60
xs
40
60
80
100
120
140
160
20
STD
xs
40
60
80
100
120
140
160
22
STD
xs
60
80
13
BUTTWELDING ENDS
ASME 816.25-1997
TABLE A I
Nominal
Pipe Size
[Note
INPSI
Schedule
No.
I1 I1
Wrought or
Fabricated
Components,
A [Note (1)1
Cast Steel
Valves,
A [Note (211
C [Note (3I1
22
100
120
140
160
22.00
22.00
22.00
22.00
22.34
22.34
22.34
22.34
19.250
18.750
18.250
17.750
19.553
19.115
18.678
18.240
1.375
1.625
1.875
2.125
24
STD
30
40
60
80
100
120
140
160
24.00
24.00
24.00
24.00
24.00
24.00
24.00
24.00
24.00
24.00
24.38
24.38
24.38
24.38
24.38
24.38
24.38
24.38
24.38
24.38
23.250
23.000
22.876
22.624
22.062
21.562
20.938
20.376
19.876
19.312
23.303
23.084
22.975
22.755
22.263
21.826
21.280
20.788
20.350
19.857
0.375
0.500
0.562
0.688
0.969
1.219
1.531
1.812
2.062
2.344
26
10
20
26.00
26.00
26.38
26.38
25.376
25.000
25.413
25.084
0.31 2
0.500
28
10
20
30
28.00
28.00
28.00
28.38
28.38
28.38
27.376
27.000
26.750
27.413
27.084
26.865
0.312
0.500
0.625
30
10
20
30
30.00
30.00
30.00
30.38
30.38
30.38
29.376
29.000
28.750
29.413
29.084
28.865
0.312
0.500
0.625
32
10
20
30
40
32.00
32.00
32.00
32.00
32.50
32.50
32.50
32.50
31.376
31.000
30.750
30.624
31.413
31.084
30.865
30.755
0.312
0.500
0.625
0.688
34
10
20
30
40
34.00
34.00
34.00
34.00
34.50
34.50
34.50
34.50
33.376
33.000
32.750
32.624
33.413
33.084
32.865
32.755
0.312
0.500
0.625
0.688
36
10
20
30
40
36.00
36.00
36.00
36.00
36.50
36.50
36.50
36.50
35.376
35.000
34.750
34.500
35.413
35.084
34.865
34.646
0.312
0.500
0.625
0.750
xs
GENERAL NOTES:
(a) Dimensions are i n inches.
(b) See Section 5 for tolerances.
NOTES:
(1) Letter designations signify:
(a) STD = standard wall thickness
(b) XS = extra-strong wall thickness
(c) XXS = double extra-strong wall thickness
(2) The diameters listed are not requirements. They are provided for the convenience of the user.
(3) Internal machining for continuous backing rings for
sizes NPS 2 and smaller is not contemplated.
dimension for sizes not listed.
14
ANNEX B
QUALITY SYSTEM PROGRAM
(This is a nonmandatory part of ASME 816.25 and is included for information only.)
The series
manufacturers quality system program by an independent organization shall be the responsibility of the
manufacturer. The detailed documentation demonstrating
program
compliance shall
be
available to
the
purchaser at the manufacturers facility. A written summary description of the program utilized by the product
manufacturer shall be available tothe purchaser upon
request. The product manufacturer is defined as the
entity whose name or trademark appears on the product
in accordance with the marking or identification requirements of ASME B16.25.
ASME 816.25-1997
BUTTWELDING ENDS
ANNEX C
REFERENCES
(This Annex is an integral part of ASME B16.25 and is placed after the main text for convenience.)
IS0 9000-2:1993:QualityManagementand
Quality
Assurance Standards - Part 2: Generic Guidelines for
the Application of IS0 9001, IS0 9002, and IS0 9003
ANSVASMEB36.10M-1985,Weldedand
WroughtSteelPipe
Seamless
ASTM Publications
ANSI
AmericanNational Standards Institute, Inc.
1 1 West 42nd Street, New York, NewYork
IS0
I S 0 Publications
IS0 9000-1:1994:Quality
Management andQuality
Assurance Standards - Part I: Guidelines for Selection
andUse
17
10036