OMG SERIES ORIFICE METERS

CAPACITIES
OMG SERIES ORIFICE METERS
AIR & NATURAL GAS FLOW CAPACITY (SCFH)
100 – 200 Series Threaded / Weld-In
3/8" Through 1 ½" Pipe Size
Pipe
Size
OMG
Model
Number
3/8"
103
1/2"
105
3/4"
107
1"
110
1 ¼"
112
1 ½"
115
Orifice
Bore
Size
0.197
0.232
0.266
0.307
0.350
0.232
0.266
0.317
0.368
0.423
0.273
0.324
0.379
0.437
0.508
0.585
0.324
0.384
0.452
0.523
0.613
0.715
0.456
0.533
0.630
0.735
0.850
0.986
0.533
0.635
0.744
0.867
1.005
1.156
Air
0.5"
w.c.P
24
33
44
61
84
32
42
61
85
118
44
62
86
116
162
221
61
86
120
163
231
331
120
165
233
324
447
641
164
234
325
450
626
881
1"
w.c.P
33
46
62
85
118
45
60
86
120
166
62
87
121
163
228
322
86
122
170
230
326
467
170
233
330
457
632
905
232
331
459
636
885
1245
Natural Gas
3"
w.c.P
57
80
107
147
203
78
103
149
206
286
107
151
208
282
394
555
149
210
293
398
562
806
294
403
570
790
1092
1564
400
572
794
1100
1530
2151
5"
w.c.P
73
103
137
189
261
100
133
191
265
368
137
194
268
363
507
714
192
270
378
513
724
1039
379
520
734
1018
1407
2015
516
737
1023
1417
1972
2771
0.5"
w.c.P
30
42
57
78
108
41
55
79
109
152
57
80
110
149
208
294
79
111
155
211
297
427
155
213
301
418
577
827
212
302
419
581
808
1137
1"
w.c.P
43
60
80
110
152
58
77
111
154
214
80
113
156
211
294
415
111
157
219
297
420
602
219
301
425
590
815
1168
299
427
593
821
1142
1607
3"
w.c.P
73
103
137
189
262
100
133
192
266
369
137
194
269
363
508
716
192
271
378
513
725
1040
379
520
735
1020
1409
2018
517
738
1024
1419
1974
2776
5"
w.c.P
94
132
177
244
336
129
171
247
342
475
177
250
346
468
654
921
247
349
487
661
935
1340
488
671
947
1314
1816
2600
666
951
1320
1829
2544
3576
Notes:
1.
2.
3.
4.
5.
Orifice Bore Size Equals the Orifice Plate Inside Diameter. All Bore Sizes In Inches. Pipe Size Equals Schedule 40 Pipe.
Capacity Based On 60°F @ 1 psig Upstream Pressure. Natural Gas Specific Gravity At 0.60; Air Specific Gravity At 1.0.
1__ Model Number Designates NPT Threaded Connection. 2__ Model Number Designates Weld-In Connection.
All Flow Rates At Standard Barometric Pressure: 29.92" Hg (Sea Level)
Design Capacity Is Based On 3" W.C.P.
(OVER)
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., 100 North Harris Street Cleona, PA 17042 717-272-3051
4/14
www.hauckburner.com
Fax: 717-273-9882
OMG-2
OMG SERIES ORIFICE METERS
AIR & NATURAL GAS FLOW CAPACITY (SCFH)
100 – 200 Series Threaded / Weld-In
2" Through 6" Pipe Size
Pipe
Size
OMG
Model
Number
2"
120
2 ½"
125
3"
130/230
4"
240
6"
260
Orifice
Bore
Size
Air
Natural Gas
0.5"
w.c.P
1"
w.c.P
3"
w.c.P
5"
w.c.P
0.5"
w.c.P
1"
w.c.P
3"
w.c.P
5"
w.c.P
0.640
0.754
0.875
1.034
1.203
1.375
0.754
0.890
1.048
1.236
1.423
1.625
0.894
1.056
1.252
1.452
1.688
1.963
1.261
1.470
1.722
2.029
2.345
2.691
1.735
2.067
2.437
2.879
3.314
3.850
4.388
238
334
455
650
911
1250
330
464
651
926
1266
1730
462
649
923
1262
1753
2483
919
1258
1748
2479
3418
4731
1729
2470
3468
4924
6685
9423
13055
335
470
640
914
1278
1753
465
652
916
1302
1778
2428
651
914
1300
1776
2466
3489
1295
1773
2462
3491
4810
6655
2439
3484
4890
6941
9420
13272
18381
577
808
1100
1568
2192
3003
800
1123
1576
2237
3053
4164
1122
1575
2237
3056
4238
5993
2234
3056
4242
6009
8275
11440
4211
6011
8434
11965
16231
22856
31638
743
1039
1415
2016
2817
3858
1030
1445
2027
2877
3925
5353
1444
2027
2879
3932
5452
7706
2877
3935
5461
7734
10648
14716
5425
7743
10863
15408
20897
29419
40712
307
430
586
836
1170
1605
425
597
838
1191
1628
2223
595
836
1188
1625
2256
3193
1184
1621
2251
3192
4400
6088
2229
3184
4469
6344
8611
12135
16809
432
605
824
1175
1644
2253
599
840
1180
1676
2288
3123
839
1178
1674
2287
3174
4491
1670
2285
3173
4497
6195
8568
3146
4493
6305
8947
12140
17101
23679
744
1041
1417
2019
2822
3865
1031
1447
2030
2881
3932
5362
1446
2030
2884
2938
5460
7719
2881
3941
5468
7746
10665
14741
5432
7754
10878
15429
20928
29466
40781
958
1339
1823
2597
3629
4967
1328
1863
2613
3707
5056
6894
1863
2614
3712
5068
7026
9929
3710
5075
7041
9971
13725
18966
6998
9988
14011
19870
26946
37931
52484
Notes:
1.
2.
3.
4.
5.
Orifice Bore Size Equals the Orifice Plate Inside Diameter. All Bore Sizes In Inches. Pipe Size Equals Schedule 40 Pipe.
Capacity Based On 60°F @ 1 psig Upstream Pressure. Natural Gas Specific Gravity At 0.60; Air Specific Gravity At 1.0.
1__ Model Number Designates NPT Threaded Connection. 2__ Model Number Designates Weld-In Connection.
All Flow Rates At Standard Barometric Pressure: 29.92" Hg (Sea Level)
Design Capacity Is Based On 3" W.C.P.
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
CAPACITIES
OMG SERIES ORIFICE METERS
AIR FLOW CAPACITY (SCFH)
2000 Series Weld – In
8" Through 16" Pipe Size
Pipe
Size
OMG
Model
No.
8"
2080
10"
2100
12"
2120
14"
2140
16"
2160
Orifice
Bore
Size
3.272
3.874
4.562
5.268
5.788
4.095
4.944
5.770
6.514
7.241
4.90
5.80
6.90
7.80
8.70
5.70
6.80
8.00
9.10
10.10
6.50
7.80
9.20
10.50
11.60
Air Flow
0.5"
w.c.ΔP
6247
8921
12772
17891
22737
9773
14550
20453
27159
35497
13975
19934
29179
38839
51176
18893
27396
39120
52796
68642
24550
36040
51776
70505
90725
1"
w.c.ΔP
8814
12582
18006
25215
32038
13791
20527
28846
38295
50041
19727
28131
41166
54781
72168
26673
38668
55202
74486
96825
34665
50876
73073
99487
127999
3"
w.c.ΔP
15209
21702
31044
43452
55193
23806
35418
49754
66030
86255
34061
48557
71029
94492
124444
46064
66258
95273
128517
167015
59874
87849
126139
171686
220835
5"
w.c.ΔP
19591
27951
39975
55942
71044
30670
45623
64078
85025
111049
43886
62555
91489
121692
160237
59354
86009
122728
165526
215075
77153
113188
162499
221141
284403
6"
w.c.ΔP
22441
30588
43744
61210
77729
33567
49929
70122
93038
121505
48033
68462
100122
133166
175332
64964
94133
134313
181139
235345
84446
123881
177841
242004
311213
8"
w.c.ΔP
24715
35255
50412
70530
89552
38695
57551
80817
107215
139999
55372
78916
115398
153166
202031
74892
108511
154813
208761
271197
97354
142807
204990
278914
358633
10"
w.c.ΔP
27586
39348
56260
78701
99915
43193
64235
90195
119644
156208
61810
88087
128795
171265
225432
83602
121123
172791
232980
302621
108678
159408
228799
311276
400196
Notes:
1.
2.
3.
4.
Orifice Bore Size Equals The Orifice Plate Inside Diameter. All Bore Sizes In Inches. Pipe Size Is A Nominal Pipe ID.
Capacity Based On 60°F @ 1 psig Upstream Pressure. Air Specific Gravity 1.0.
All Flow Rates At Standard Barometric Pressure 29.92" Hg (Sea Level)
Design Capacity Is Based On 3" W.C.ΔP.
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
(OVER)
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
9/98
www.hauckburner.com
Fax: 717-273-9882
OMG-2.1
OMG SERIES ORIFICE METERS
AIR FLOW CAPACITY (SCFH)
2000 Series Weld – In
18" Through 28" Pipe Size
Pipe
Size
OMG
Model
No.
18"
2180
20"
2200
22"
2220
24"
2240
28"
2280
Orifice
Bore
Size
7.3
8.7
10.3
11.8
13.0
8.2
9.7
11.5
13.1
14.4
9.0
10.7
12.6
14.3
15.9
9.8
11.6
13.8
15.7
17.4
11.4
13.6
16.0
18.2
20.2
Air Flow
0.5"
w.c.ΔP
30947
44758
64773
88932
113553
39066
55639
80801
109495
138946
47037
67703
96855
129987
169696
55748
79477
116254
157028
203519
75388
109262
155929
210302
273180
1"
w.c.ΔP
43701
63191
91430
125508
160233
55170
78562
114066
154548
196092
66433
95604
136743
183492
239514
78740
112238
164144
221682
287280
106490
154318
220195
296938
385674
3"
w.c.ΔP
75491
109131
157854
216631
276502
95311
135691
196959
266793
338437
114778
165141
236144
316802
413428
136051
193892
283487
382772
495930
184022
266618
380353
512805
665913
5"
w.c.ΔP
97282
140616
203368
279049
356120
122826
174845
253758
343682
435913
147916
212800
304256
408124
532523
175337
249856
365266
493124
638812
237168
343589
490102
660689
857829
6"
w.c.ΔP
106479
153903
222573
305381
389700
134439
191370
277725
376119
477025
161903
232913
332997
446651
582754
191918
273475
399773
539680
699076
259599
376073
536413
723079
938775
8"
w.c.ΔP
122757
177420
256557
351967
449095
154993
220615
320137
433507
549746
186659
268510
383856
514815
671602
221266
315276
460837
622046
805668
299302
433565
6183645
833464
1081954
10"
w.c.ΔP
137037
198048
286362
392813
501154
173025
246268
357332
483823
613486
208377
299736
428461
574580
749477
247012
351944
514391
694264
899096
334134
483996
690239
930249
1207453
Notes:
1.
2.
3.
4.
Orifice Bore Size Equals The Orifice Plate Inside Diameter. All Bore Sizes In Inches. Pipe Size Is A Nominal Pipe ID.
Capacity Based On 60°F @ 1 psig Upstream Pressure Air Specific Gravity 1.0.
All Flow Rates At Standard Barometric Pressure: 29.92" Hg (Sea Level).
Design Capacity Is Based On 3" W.C.ΔP.
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
DIMENSIONS
OMG SERIES ORIFICE METERS
(NOT TO SCALE)
X1497
100 SERIES THREADED DESIGN
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
8/06
www.hauckburner.com
Fax: 717-273-9882
OMG-3
(NOT TO SCALE)
X1499
DIMENSIONS
OMG 200 SERIES WELD-IN DESIGN
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
DIMENSIONS
OMG SERIES ORIFICE METERS
(NOT TO SCALE)
X3305
2000 SERIES AIR ONLY WELD-IN DESIGN
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
8/12
www.hauckburner.com
Fax: 717-273-9882
OMG-3.1
OMG SELECTION CHART
NATURAL GAS (SCFH) @ 3" W.C. ΔP
SUPPLEMENTAL DATA
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
9/98
www.hauckburner.com
Fax: 717-273-9882
OMG-4
OMG SELECTION CHART
NATURAL GAS (SCFH) @ 3" W.C. ΔP
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
OMG SELECTION CHART
AIR (SCFH) @ 3" W.C. ΔP
SUPPLEMENTAL DATA
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
9/98
www.hauckburner.com
Fax: 717-273-9882
OMG-4.1
OMG SELECTION - AIR (SCFH) @ 3" W.C. ΔP
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
SUPPLEMENTAL DATA
OMG SELECTION CHART
2000 SERIES – AIR SERVICE (SCFH) @ 3" W.C. ΔP
In accordance with Hauck’s commitment to Total Quality Improvement, Hauck reserves the right to change the specifications of products without prior notice.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
9/98
www.hauckburner.com
Fax: 717-273-9882
OMG-4.2
APPLICATION DATA
OMG SERIES ORIFICE METERS
CORRECTING FOR CONDITIONS OUTSIDE CATALOG PARAMETERS
The capacities listed in OMG-2 and OMG-2.1 are cataloged at 60°F and 1 psig upstream pressure
(specific gravity for air at 1.0, natural gas 0.60). When these conditions are not present, corrections
must be applied to the catalog flow rate.
Upstream Pressure
For an upstream pressure other than 1 psig, obtain the appropriate correction factor for upstream
pressure, then determine the corrected flow as shown.
(1)
p2 + 14.7
Cpress=
p1 + 14.7
Cpress= Upstream Pressure Correction Factor
p1 = Cataloged Upstream Pressure (1 psig)
p2 = Actual Upstream Pressure (psig)
(Note: 1psig = 27.7" W.C.)
Table 1
p2(psig)
Cpress
0.5
.98
1.0
1.0
1.5
1.01
2.0
1.03
3.0
4.0
5.0
10.0
1.06
1.09
1.12
1.25
Multiply the pressure correction factor, Cpress, by the flow determined from
the OMG capacity table to obtain the corrected flow. For example, an
OMG 115 with a .744" orifice has a capacity of 1024 SCFH natural gas at
3" ΔP. For a 2 psig upstream pressure, the corrected flow will be 1024
SCFH X 1.03 = 1055 SCFH.
Specific Gravity
For a specific gravity other than 0.60 (natural gas) or 1.0 (air), use FORMULA 2 or TABLE 2 to
obtain the appropriate specific gravity correction factor, then determine the corrected flow as shown.
Table 2
(2)
Cs.g.=
s.g.1
s.g.2
Cs.g. = Specific Gravity Correction Factor
s.g.1 = Specific Gravity - Natural Gas (0.60)
s.g.2 = Specific Gravity - Actual Gas
Gas
s.g.
Cs.g.
Coke Oven
0.40
1.22
Natural
0.60
1.0
Air
1.0
.77
Propane
1.52
.63
Butane
2.01
.55
Multiply the s.g. correction factor, Cs.g., by the flow determined from the
OMG capacity table to obtain the corrected flow. For example, an OMG
115 with a .744" orifice has a capacity of 1024 SCFH natural gas at 3" ΔP.
For propane, the corrected flow will be 1024 SCFH X 0.63 = 645 SCFH.
Temperature
For a gas temperature other than 60°F, use FORMULA 3 or TABLE 3 to obtain the appropriate
temperature correction factor, then determine the correct flow as shown.
(3)
Ctemp=
Abs Temp1
Abs Temp2
Ctemp = Temperature Correction Factor
Abs Temp1 = t1 + 460
Abs Temp2 = t2 + 460
t1 = Catalog Temperature (60oF)
t2 = Actual Temperature (oF)
Table 3
Temp., °F
Ctemp
50
1.01
60
1.0
80
.98
100
150
200
250
.96
.92
.88
.85
Multiply the temp. correction factor, Ctemp, by the flow determined from the OMG
capacity table to obtain the corrected flow. For example, an OMG 115 with a
.744" orifice has a capacity of 1024 SCFH natural gas at 3" ΔP. For a natural
gas temperature at 100°F, the corrected flow is 1024 SCFH X .96 = 983 SCFH.
Note: If more than one correction factor is necessary, simply multiply the cataloged flow by each of the correction factors.
For all the correction factors shown above, the corrected flow will be 1024 SCFH X 1.03 X 0.63 X 0.96 = 638 SCFH.
HAUCK MANUFACTURING CO., P.O. Box 90 Lebanon, PA 17042-0090 717-272-3051
3/02
www.hauckburner.com
Fax: 717-273-9882
OMG-7
Non Cataloged Differential Pressure And/Or Flow
To calculate differential pressure and/or flow not listed in the OMG Capacity Tables, use the Square
Root Law, Formula 4 and 5 as shown below.
(4)
Q2= Q1
p2
p1
Q2 = Unknown Flow (SCFH) @ p
Q1 = Catalog Flow (SCFH) @ p 1
p2 = Actual Pressure p @ Q 2
p1 = Catalog Pressure p @ Q 1
2
(5)
p2= p1
Q2
Q1
p @ Q2 ("w.c.)
p2 =
p1 = Catalog p @ Q1 ("w.c.)
Q2 = Desired Flow @ p2 (SCFH)
Q1 = Catalog Flow @ p1 (SCFH)
For example, an OMG 115 with a .744" orifice
has a flow capacity of 1024 SCFH natural gas
at 3" w.c. Δp, 1 psig upstream pressure and
60°F. To determine the flow at 4.3" w.c. Δp,
plug the known variables listed below into
formula 4.
Q2 = unknown
Q1 = 1024 SCFH
p2 = 4.3" w.c. Δp
p1 = 3.0" w.c. Δp
Solving Formula 4, for Q2, the natural gas
flow is 1226 SCFH.
For example, an OMG 115 with a .744"
orifice has a flow capacity of 1024 SCFH
natural gas at 3" w.c. Δp , 1 psig upstream
pressure and 60°F. To determine the Δp for
a flow of 775 SCFH, plug the known
variables listed below into formula 5.
p2 = unknown
p1 = 3" w.c. Δp
Q2 = 775 SCFH
Q1 = 1024 SCFH
Solving Formula 5 for p2, the natural gas
Δp is 1.71" w.c.
SAMPLE OMG SELECTION PROBLEM
Select an orifice meter to measure 925 cubic feet per hour natural gas at 3" w.c. pressure drop
across the orifice meter. The meter shall be installed in 1 ½" threaded, scheduled 40 pipe. The
specific gravity of the gas is 0.60 with an upstream pressure of 1 psig and temperature of 60°F.
Using the capacity table OMG-2, select natural gas and 1 ½ " pipe size. Next, select the 115
model number for threaded connections. Then, look in the 3" w.c. Δp column and find the flow
that is closest to 925 cubic feet per hour. In this case, the closest available orifice bore is 0.744"
which has a natural gas flow capacity of 1024 SCFH.
Select an OMG-115 with a 0.744" orifice.
To calculate the actual Δp at 925 SCFH, use formula 5.