Flow Measurement
Product Data Sheet
FM-CR/FLGA
ANSI B16.36 Orifice Flanges
n Wide range of materials, including
ASTM A105N Carbon Steel
ASTM A350 LF2 Carbon Steel
ASTM A182 F316L Stainless Steel
n Ratings from 300 lb to 2500 lb
n Sizes from 1” Nominal Bore
n Corner Tapping Versions Available
General Description
Orifice flanges are intended for use instead of
standard pipe flanges when an orifice plate or
flow nozzle must be installed. Pairs of pressure
tappings are machined into the orifice flange,
making separate orifice carriers or tappings in
the pipe wall unnecessary.
Thermocouple Instruments Ltd’s orifice range of
orifice flanges covers all standard sizes and
ranges, and all common flange materials.
Flanges are available in socket weld or weld
neck form, and are typically supplied with two
½” NPT tappings in each flange. Jacking
screws to ensure ease of removal of the primary
flow element are provided.
Orifice plates and flow nozzles can also be
supplied. See individual Product Data Sheets
for more information.
Orifice flanges may also be supplied complete
with bolting and gasket kits.
Orifice Flange Assembly
Gaskets
Thermocouple Instruments Ltd is able to supply
a range of suitable gaskets with its orifice
flanges. Typical specifications are:
- 1.5 mm thick IBC ring type, non asbestos
- 3.2 mm thick sprial wound type, carbon steel
outer, stainless steel inner, 316L windings with
graphite filler
Materials
Thermocouple Instruments Ltd can supply
orifice flanges in a wide range of standard and
special materials, including:
ASTM A105 Carbon Steel
ASTM A350 LF2 Low Temp Carbon Steel
ASTM A182 F316 Stainless Steel
ASTM A182 F304 Stainless Steel
ASTM A182 F11 1% Cr ½% Mo
ASTM A182 F22 2¼% Cr 1% Mo
Pressure Tappings
As standard, two ½” NPT tappings are provided
in each flange, one with a plug. Other thread
sizes are available on request. Socket weld
connections may be specified, and butt weld
pipe nipples are also available. Tappings are
generally ‘flange’ type, but corner tappings are
optional.
Studbolts and Nuts
Suitable bolting may be supplied on request.
Standard materials include:
- ASTM A193 B7 and ASTM A194 Gr 2H
- ASTM A320 L7 and ASTM A194 Gr 4 or 7
- ASTM A320 B8 and ASTM A194 Gr 8
Bolting conforming to NACE is also available.
Product Data Sheet FM-CR/FLGA
ANSI B16.36 Orifice Flanges
Weldneck Orifice Flange Assemblies
Weldneck orifice flanges are butt-welded into the
pipline. The inside diameter (or the schedule)
of the pipe should be specified when ordering.
supplied. Please refer to Product Data Sheet
FM-OP/RTJA for details of orifice plates with
RTJ holders.
Weldneck orifice flanges are available in classes
300, 600, 900, 1500 and 2500. Raised face (RF)
and ring type joint (RTJ) versions can be
Bolt sizes, weights and important dimensions of
orifice flange assemblies are shown in the
following tables.
UPSTREAM
FE-150-A3
300 mm NB
300 R.F.
d=124.56 mm
316 St St
T.I. Ltd
Orifice Plate
Dimension A
Outside Diameter
Jackscrew
Plug
Overall Length
Dimension B in the tables
assumes a gasket thickness
of 1.5 mm and a plate
thickness of 3 mm
Nominal Size
mm
25
40
50
65
80
100
150
200
250
300
350
400
450
500
600
In
1"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
Dimension B
Weldneck Orifice Flanges – 300 lb RF
Bolts
Dimensions
Approx
Weight
(kg)
Bolt Qty
Bolt Size
B
A
4
4
8
8
8
8
12
12
16
16
20
20
24
24
24
5/8" x 5.00"
3/4" x 5.25"
5/8" x 5.00"
3/4" x 5.25"
3/4" x 5.25"
3/4" x 5.25"
3/4" x 5.25"
7/8" x 5.75"
1" x 6.50"
1 1/8" x 7.00"
1 1/8" x 7.25"
1 1/4" x 7.75"
1 1/4" x 8.00"
1 1/4" x 8.50"
1 1/2" x 9.50"
9
13
14
18
21
31
50
73
100
151
207
275
341
408
604
171
178
178
184
184
190
206
229
241
266
291
298
324
330
342
124
155
165
191
210
254
318
381
445
521
584
648
711
775
914
Product Data Sheet FM-CR/FLGA
Nominal Size
mm
25
40
50
65
80
100
150
200
250
300
350
400
450
500
600
In
1"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
Nominal Size
mm
25
40
50
65
80
100
150
200
250
300
350
400
450
500
600
In
1"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
Nominal Size
mm
25
40
50
65
80
100
150
200
250
300
350
400
450
500
600
In
1"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
ANSI B16.36 Orifice Flanges
Weldneck Orifice Flanges – 600 lb RF
Bolts
Dimensions
Approx
Weight (kg)
Bolt Qty
Bolt Size
B
A
4
4
8
8
8
8
12
12
16
20
20
20
20
24
24
5/8" x 5.00"
3/4" x 5.25"
5/8" x 5.00"
3/4" x 5.25"
3/4" x 5.25"
7/8" x 6.00"
1" x 7.00"
1 1/8" x 7.75"
1 1/4" x 8.75"
1 1/4" x 9.00"
1 3/8" x 9.50"
1 1/2" x 10.25"
1 5/8" x 11.00"
1 5/8" x 11.75"
1 7/8" x 13.25"
9
13
14
18
21
41
82
124
208
250
-
171
178
178
184
184
209
241
273
311
317
336
362
374
387
412
124
155
165
191
210
273
356
419
508
559
603
686
743
813
940
Weldneck Orifice Flanges – 900 lb RF
Bolts
Dimensions
Approx
Weight
(kg)
Bolt Qty
Bolt Size
B
A
4
4
8
8
8
8
12
12
16
20
20
20
20
20
20
7/8" x 6.00"
1" x 6.25"
7/8" x 6.00"
1" x 6.50"
7/8" x 6.00"
1 1/8" x 7.00"
1 1/8" x 7.75"
1 3/8" x 9.00"
1 3/8" x 9.50"
1 3/8" x 10.25"
1 1/2" x 11.00"
1 5/8" x 11.50"
1 7/8" x 13.00"
2" x 14.00"
2 1/2" x 17.50"
13
18
29
41
34
59
120
204
291
405
-
171
184
209
215
209
235
285
330
374
406
431
438
463
501
590
149
178
216
244
241
292
381
470
546
610
641
705
787
857
1041
Weldneck Orifice Flanges – 1500 lb RF
Bolts
Dimensions
Approx
Weight
(kg)
Bolt Qty
Bolt Size
B
A
4
4
8
8
8
8
12
12
12
16
16
16
16
16
16
7/8" x 6.00"
1" x 6.25"
7/8" x 6.00"
1" x 6.50"
1 1/8" x 7.25"
1 1/4" x 8.00"
1 3/8" x 10.50"
1 5/8" x 11.75"
1 7/8" x 13.50"
2" x 15.00"
2 1/4" x 16.25"
2 1/2" x 17.75"
2 3/4" x 19.75"
3" x 21.50"
3 1/2" x 24.50"
13
18
29
41
58
82
186
306
500
764
-
171
184
209
215
241
254
349
432
514
571
603
628
660
717
819
149
178
216
244
267
311
394
483
584
673
749
826
914
984
1168
Product Data Sheet FM-CR/FLGA
ANSI B16.36 Orifice Flanges
Slip-On Orifice Flange Assemblies
Slip-on orifice flanges are designed to slip over
the pipeline before welding.
Slip-on orifice flanges are available in class 300,
with a raised face (RF).
Orifice Plate
UPSTREAM
FE-160-B2
400 mm NB
300 R.F.
d=246.96 mm
316 St St
T.I. Ltd
Dimension A
Outside Diameter
Jackscrew
Plug
Overall Length
Dimension B in the table
assumes a gasket thickness
of 1.5 mm and a plate
thickness of 3 mm
Nominal Size
mm
25
40
50
65
80
100
150
200
250
300
350
400
450
500
600
In
1"
1 1/2"
2"
2 1/2"
3"
4"
6"
8"
10"
12"
14"
16"
18"
20"
24"
Dimension B
Slip-On Orifice Flanges – 300 lb RF
Bolts
Dimensions
Approx
Weight
(kg)
Bolt Qty
Bolt Size
B
A
4
4
8
8
8
8
12
12
16
16
20
20
24
24
24
5/8" x 5"
3/4" x 5.25"
5/8" x 5.00"
3/4" x 5.25"
3/4" x 5.25"
3/4" x 5.25"
3/4" x 5.25"
7/8" x 5.75"
1" x 6.50"
1 1/8" x 7.00"
1 1/8" x 7.25"
1 1/4" x 7.75"
1 1/4" x 8.00"
1 1/4" x 8.50"
1 1/2" x 9.50"
Thermocouple Instruments Limited
Pentwyn, Cardiff, CF23 7XJ, UK
Tel: (+44) 029 20734121 Fax: (+44) 029 20734040
Internet: http://www.thermocouple.co.uk
E-mail: thermocouple@thermocouple.co.uk
7.5
9.3
11.5
15
19
29
50
65
91
133
177
240
323
360
555
102
102
105
108
111
114
114
130
139
152
158
171
184
197
219
124
155
165
191
210
254
318
381
445
521
584
648
711
775
914
All Rights Reserved. © Copyright 2000 Thermocouple Instruments Ltd.