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Dimensions Orifice Flanges RF

Dimensions Orifice Weld Neck RF flanges ASME B16.36 – Class 300
Table Header
NPS
HUB DIA
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
DIA OF TAB
A
R
O
T
H
X
Tg
1
33.4
50.8
125
36.6
81
54
6.4
1½
48.3
73.0
155
36.6
84
70
6.4
2
60.3
92.1
165
36.6
84
84
6.4
2½
73.0
104.8
190
36.6
87
100
6.4
3
88.9
127.0
210
36.6
87
117
9.5
4
114.3
157.2
255
36.6
90
146
12.7
6
168.3
215.9
320
36.6
98
206
12.7
8
219.1
269.9
380
39.7
110
260
12.7
10
273.0
323.8
445
46.1
116
321
12.7
12
323.8
381.0
520
49.3
129
375
12.7
14
355.6
412.8
585
52.4
141
425
12.7
16
406.4
469.9
650
55.6
144
483
12.7
18
457.0
533.4
710
58.8
157
533
12.7
20
508.0
584.2
775
62.0
160
587
12.7
24
610.0
692.2
915
68.3
167
702
12.7
NPS
A
R
O
T
H
X
Tg
HUB DIA
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
DIA OF TAB
NPS BOLT CIRCLE NO OF BOLTS DIA OF HOLES DIA STUD BOLTS STUD BOLT LENGTH
1
88.9
4
11/16
5/8
125
1½
114.3
4
13/16
3/4
135
2
127.0
8
11/16
5/8
125
2½
149.2
8
13/16
3/4
135
3
168.3
8
13/16
3/4
135
4
200.0
8
13/16
3/4
135
6
269.9
12
7/8
3/4
135
8
330.2
12
1
7/8
145
10
387.4
16
1.1/8
1
165
12
450.8
16
1¼
1.1/8
180
14
514.4
20
1¼
1.1/8
185
16
571.5
20
1.3/8
1¼
195
18
628.6
24
1.3/8
1¼
205
20
685.8
24
1.3/8
1¼
215
24
812.8
24
1.5/8
1½
240
NPS
BOLT CIRCLE
NO OF BOLTS
DIA OF HOLES
DIA STUD BOLTS
STUD BOLT LENGTH
Table Header
NPS
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
R
O
T
H
X
A
Tg
1
50.8
125
36.6
81
54
33.4
6.4
1½
73.0
155
36.6
84
70
48.3
6.4
2
92.1
165
36.6
84
84
60.3
6.4
2½
104.8
190
36.6
87
100
73.0
6.4
3
127.0
210
36.6
87
117
88.9
9.5
4
157.2
275
38.1
102
152
114.3
12.7
6
215.9
355
47.7
117
222
168.3
12.7
8
269.9
420
55.6
133
273
219.1
12.7
10
323.8
510
63.5
152
343
273.0
12.7
12
381.0
560
66.7
156
400
323.8
12.7
14
412.8
605
69.9
165
432
355.6
12.7
16
469.9
685
76.2
178
495
406.4
12.7
18
533.4
745
82.6
184
546
457.2
12.7
20
584.2
815
88.9
190
610
508.0
12.7
24
692.2
940
101.6
203
718
609.6
12.7
NPS
R
O
T
H
X
A
Tg
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
NPS BOLT CIRCLE NO OF BOLTS DIA OF HOLES DIA STUD BOLTS STUD BOLT LENGTH
1
88.9
4
11/16
5/8
125
1½
114.3
4
13/16
3/4
135
2
127.0
8
11/16
5/8
125
2½
149.2
8
13/16
3/4
135
3
168.3
8
13/16
3/4
135
4
215.9
8
1
7/8
150
6
292.1
12
1.1/8
1
180
8
349.2
12
1¼
1.1/8
195
10
431.8
16
1.3/8
1¼
220
12
489.0
20
1.3/8
1¼
230
14
527.0
20
1½
1.3/8
240
16
603.2
20
1.5/8
1½
260
18
654.0
20
1.3/4
1.5/8
280
20
723.9
24
1.3/4
1.5/8
300
24
838.2
24
2
1.7/8
335
NPS
BOLT CIRCLE
NO OF BOLTS
DIA OF HOLES
DIA STUD BOLTS
STUD BOLT LENGTH
Table Header
NPS
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
R
O
T
H
X
A
Tg
1
50.8
125
36.6
81
54
33.4
6.4
1½
73.0
155
36.6
84
70
48.3
6.4
2
92.1
165
36.6
84
84
60.3
6.4
2½
104.8
190
36.6
87
100
73.0
6.4
3
127.0
240
38.1
102
127
88.9
9.5
4
157.2
290
44.5
114
159
114.3
12.7
6
215.9
380
55.6
140
235
168.3
12.7
8
269.9
470
63.5
162
298
219.1
12.7
10
323.8
545
69.9
184
368
273.0
12.7
12
381.0
610
79.4
200
419
323.8
12.7
14
412.8
640
85.8
213
451
355.6
12.7
16
469.9
705
88.9
216
508
406.4
12.7
18
533.4
785
101.6
229
565
457.2
12.7
20
584.2
855
108.0
248
622
508.0
12.7
24
692.2
1040
139.7
292
749
609.6
12.7
NPS
R
O
T
H
X
A
Tg
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
NPS BOLT CIRCLE NO OF BOLTS DIA OF HOLES DIA STUD BOLTS STUD BOLT LENGTH
1
88.9
4
11/16
5/8
125
1½
114.3
4
13/16
3/4
135
2
127.0
8
11/16
5/8
125
2½
149.2
8
13/16
3/4
135
3
190.5
8
1
7/8
150
4
235.0
8
1¼
1.1/8
180
6
317.5
12
1¼
1.1/8
195
8
393.7
12
1½
1.3/8
230
10
469.9
16
1½
1.3/8
240
12
533.4
20
1½
1.3/8
260
14
558.8
20
1.5/8
1½
280
16
616.0
20
1.3/4
1.5/8
290
18
685.8
20
2
1.7/8
330
20
749.3
20
2.1/8
2
355
24
901.7
20
2 5/8
2½
445
NPS
BOLT CIRCLE
NO OF BOLTS
DIA OF HOLES
DIA STUD BOLTS
STUD BOLT LENGTH
Table Header
NPS
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
R
O
T
H
X
A
Tg
1
50.8
150
38.1
83
52
33.5
6.4
1½
73.0
180
38.1
89
70
48.3
6.4
2
92.1
215
38.1
102
105
60.3
6.4
2½
104.8
245
41.3
105
124
73.0
6.4
3
127.0
265
47.7
117
133
88.9
9.5
4
157.2
310
54.0
124
162
114.3
12.7
6
215.9
395
82.6
171
229
168.3
12.7
8
269.9
485
92.1
213
292
219.1
12.7
10
323.8
585
108.0
254
368
273.0
12.7
12
381.0
675
123.9
283
451
323.8
12.7
14
412.8
750
133.4
298
495
355.6
12.7
16
469.9
825
146.1
311
552
406.4
12.7
18
533.4
915
162.0
327
597
457.2
12.7
20
584.2
985
177.8
356
641
508.0
12.7
24
692.2
1170
203.2
406
762
609.6
12.7
NPS
R
O
T
H
X
A
Tg
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
NPS BOLT CIRCLE NO OF BOLTS DIA OF HOLES DIA STUD BOLTS STUD BOLT LENGTH
1
101.6
4
1
7/8
150
1½
123.8
4
1.1/8
1
160
2
165.1
8
1
7/8
150
2½
190.5
8
1.1/8
1
165
3
203.2
8
1¼
1.1/8
185
4
241.3
8
1.3/8
1¼
205
6
317.5
12
1½
1.3/8
265
8
393.7
12
1.3/4
1.5/8
300
10
482.6
12
2
1.7/8
345
12
571.6
16
2.1/8
2
380
14
635.0
16
2 3/8
2¼
415
16
704.8
16
2 5/8
2½
450
18
774.7
16
2 7/8
2.3/4
500
20
831.8
16
3.1/8
3
545
24
990.6
16
3.5/8
3½
620
NPS
BOLT CIRCLE
NO OF BOLTS
DIA OF HOLES
DIA STUD BOLTS
STUD BOLT LENGTH
Table Header
NPS
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
R
O
T
H
X
A
Tg
1
50.8
160
38.1
92
57
33.5
6.4
1½
73.0
205
44.5
111
79
48.3
6.4
2
92.1
235
50.8
127
95
60.3
6.4
2½
104.8
265
57.2
143
114
73.0
6.4
3
127.0
305
66.7
168
133
88.9
9.5
4
157.2
355
76.2
190
165
114.3
12.7
6
215.9
485
108.0
273
235
168.3
12.7
8
269.9
550
127.0
318
305
219.1
12.7
10
323.8
675
165.1
419
375
273.0
12.7
12
381.0
760
184.2
464
441
323.8
12.7
NPS
R
O
T
H
X
A
Tg
DIA RF
OUT SIDE DIA
MIN THK FLG
HGT FLG
HUB DIA
HUB DIA
DIA OF TAB
NPS BOLT CIRCLE NO OF BOLTS DIA OF HOLES DIA STUD BOLTS STUD BOLT LENGTH
1
108.0
4
1
7/8
150
1½
146.0
4
1¼
1.1/8
180
2
171.4
8
1.1/8
1
185
2½
196.8
8
1¼
1.1/8
205
3
228.6
8
1.3/8
1¼
230
4
273.0
8
1.5/8
1½
260
6
368.3
8
2.1/8
2
350
8
438.2
12
2.1/8
2
385
10
539.8
12
2 5/8
2½
490
12
619.1
12
2 7/8
2.3/4
540
NPS
BOLT CIRCLE
NO OF BOLTS
DIA OF HOLES
DIA STUD BOLTS
STUD BOLT LENGTH

General Notes:

  • Dimensions are in millimeters, except for bolts and bolt holes.
  • Height of Raised Face (RF) in CLASS 300 is 2 mm.
  • All other dimensions are in accordance with ASME B16.5.
  • Ring joint flanges larger than NPS 3 will require angular meter taps.

Notes:

  • Other NPT sizes may be furnished if required.
  • Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 1 to NPS 3.
  • Bore (B) is to be specified by the purchaser.
  • The length of the Stud Bolt does not include the height of the chamfers (points).

TOLERANCES

  • Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.

PRESSURE TAP LOCATION

  • Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below.
  • ±0.5 mm (±0.02 in.) for flanges smaller than NPS 4
  • ±0.8 mm (±0.03 in.) for flanges NPS 4 and larger

BORE DIAMETER

  • Bore diameter tolerance (Welding Neck flanges only) is ±0.5% of nominal value.

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