Low Pressure Orifice Chart
The information contained in this chart is meant to be general in nature.
There are many factors which go into compiling a specific number of Btu's per
cubic foot, such as gas temperature, altitude, and source of gas, factors which can all vary.
Low Pressure Chart
|
Gas
Orifice Capacity Chart
BTU
Ratings
|
Drill
|
Gas Pressure In
Water Column Inches
|
|
No.
|
|
Size
|
|
<---
|
|
NATURAL
GAS
|
--->
|
|
<LP>
|
|
---
|
|
---
|
|
3.0
|
|
3.5
|
|
4.0
|
|
4.5
|
|
7.0
|
|
11.0
|
|
80
|
|
.0135
|
|
428
|
|
463
|
|
495
|
|
525
|
|
654
|
|
1273
|
|
79
|
|
.0145
|
|
494
|
|
534
|
|
571
|
|
605
|
|
755
|
|
1469
|
|
1/64
|
|
.0156
|
|
572
|
|
618
|
|
661
|
|
701
|
|
874
|
|
1700
|
|
78
|
|
.0160
|
|
602
|
|
650
|
|
695
|
|
737
|
|
919
|
|
1788
|
|
77
|
|
.0180
|
|
762
|
|
823
|
|
879
|
|
933
|
|
1163
|
|
2263
|
|
76
|
|
.0200
|
|
940
|
|
1016
|
|
1086
|
|
1152
|
|
1436
|
|
2794
|
|
75
|
|
.0210
|
|
1037
|
|
1120
|
|
1197
|
|
1270
|
|
1583
|
|
3081
|
|
74
|
|
.0225
|
|
1190
|
|
1285
|
|
1374
|
|
1457
|
|
1818
|
|
3536
|
|
73
|
|
.0240
|
|
1354
|
|
1462
|
|
1563
|
|
1658
|
|
2068
|
|
4024
|
|
72
|
|
.0250
|
|
1469
|
|
1587
|
|
1696
|
|
1799
|
|
2244
|
|
4366
|
|
71
|
|
.0260
|
|
1589
|
|
1716
|
|
1835
|
|
1946
|
|
2427
|
|
4722
|
|
70
|
|
.0280
|
|
1843
|
|
1991
|
|
2128
|
|
2257
|
|
2815
|
|
5476
|
|
69
|
|
.0292
|
|
2004
|
|
2165
|
|
2314
|
|
2455
|
|
3062
|
|
5956
|
|
68
|
|
.0310
|
|
2259
|
|
2440
|
|
2608
|
|
2767
|
|
3451
|
|
6713
|
|
1/32
|
|
.0313
|
|
2303
|
|
2487
|
|
2659
|
|
2820
|
|
3518
|
|
6843
|
|
67
|
|
.0320
|
|
2407
|
|
2600
|
|
2779
|
|
2948
|
|
3677
|
|
7153
|
|
66
|
|
.0330
|
|
2560
|
|
2765
|
|
2956
|
|
3135
|
|
3910
|
|
7607
|
|
65
|
|
.0350
|
|
2880
|
|
3110
|
|
2235
|
|
3527
|
|
4399
|
|
8557
|
|
64
|
|
.0360
|
|
3046
|
|
3291
|
|
3518
|
|
3731
|
|
4654
|
|
9053
|
|
63
|
|
.0370
|
|
3218
|
|
3476
|
|
3716
|
|
3941
|
|
4916
|
|
9563
|
|
62
|
|
.0380
|
|
3394
|
|
3666
|
|
3919
|
|
4157
|
|
5185
|
|
10087
|
|
61
|
|
.0390
|
|
3575
|
|
3862
|
|
4128
|
|
4379
|
|
5461
|
|
10625
|
|
60
|
|
.0400
|
|
3761
|
|
4062
|
|
4343
|
|
4606
|
|
5745
|
|
11176
|
|
59
|
|
.0410
|
|
3951
|
|
4268
|
|
4563
|
|
4840
|
|
6036
|
|
11742
|
|
58
|
|
.0420
|
|
4147
|
|
4479
|
|
4788
|
|
5078
|
|
6334
|
|
12322
|
|
57
|
|
.0430
|
|
4346
|
|
4695
|
|
5019
|
|
5323
|
|
6639
|
|
12916
|
|
56
|
|
.0465
|
|
5083
|
|
5490
|
|
5869
|
|
6225
|
|
7764
|
|
15104
|
|
3/64
|
|
.0469
|
|
5171
|
|
5585
|
|
5970
|
|
6333
|
|
7898
|
|
15365
|
|
55
|
|
.0520
|
|
6356
|
|
6865
|
|
7339
|
|
7785
|
|
9709
|
|
18888
|
|
54
|
|
.0550
|
|
7111
|
|
7680
|
|
8211
|
|
8709
|
|
10862
|
|
21131
|
|
53
|
|
.0595
|
|
8322
|
|
8989
|
|
9609
|
|
10192
|
|
12712
|
|
24730
|
|
1/16
|
|
.0625
|
|
9182
|
|
9918
|
|
10603
|
|
11246
|
|
14026
|
|
27286
|
|
52
|
|
.0635
|
|
9478
|
|
10238
|
|
10945
|
|
11609
|
|
14479
|
|
28167
|
|
51
|
|
.0670
|
|
10552
|
|
11398
|
|
12184
|
|
12924
|
|
16119
|
|
31357
|
|
50
|
|
.0700
|
|
11518
|
|
12441
|
|
13300
|
|
14107
|
|
17594
|
|
34228
|
|
49
|
|
.0730
|
|
12527
|
|
13530
|
|
14464
|
|
15342
|
|
19135
|
|
37225
|
|
48
|
|
.0760
|
|
13577
|
|
14665
|
|
15678
|
|
16629
|
|
20740
|
|
40347
|
|
5/64
|
|
.0781
|
|
14338
|
|
15487
|
|
16556
|
|
17560
|
|
21902
|
|
42608
|
|
47
|
|
.0785
|
|
14485
|
|
15646
|
|
16726
|
|
17741
|
|
22127
|
|
43045
|
|
46
|
|
.0810
|
|
15423
|
|
16658
|
|
17809
|
|
18889
|
|
235558
|
|
45831
|
|
45
|
|
.0820
|
|
15806
|
|
17072
|
|
18251
|
|
19358
|
|
24144
|
|
46969
|
|
44
|
|
.0860
|
|
17385
|
|
18778
|
|
20075
|
|
21293
|
|
26557
|
|
51663
|
|
43
|
|
.0890
|
|
18620
|
|
20111
|
|
21500
|
|
22804
|
|
28442
|
|
55331
|
|
42
|
|
.0935
|
|
20550
|
|
22197
|
|
23729
|
|
25168
|
|
31391
|
|
61067
|
|
3/32
|
|
.0938
|
|
20682
|
|
22339
|
|
23882
|
|
25330
|
|
31592
|
|
61460
|
|
41
|
|
.0960
|
|
21664
|
|
23399
|
|
25015
|
|
26532
|
|
33092
|
|
64377
|
|
40
|
|
.0980
|
|
22576
|
|
24384
|
|
26068
|
|
27649
|
|
34485
|
|
67087
|
|
Drill
|
Gas Pressure In
Water Column Inches
|
|
No.
|
|
Size
|
|
<---
|
|
NATURAL
GAS
|
--->
|
|
<LP>
|
|
---
|
|
---
|
|
3.0
|
|
3.5
|
|
4.0
|
|
4.5
|
|
7.0
|
|
11.0
|
|
39
|
|
.0995
|
|
23272
|
|
25137
|
|
26872
|
|
28502
|
|
35549
|
|
69156
|
|
38
|
|
.1015
|
|
24217
|
|
26157
|
|
27963
|
|
29660
|
|
36992
|
|
71964
|
|
37
|
|
.1040
|
|
25425
|
|
27462
|
|
29358
|
|
31139
|
|
38837
|
|
75553
|
|
36
|
|
.1065
|
|
26662
|
|
28798
|
|
30786
|
|
32654
|
|
40726
|
|
79229
|
|
7/64
|
|
.1094
|
|
28133
|
|
30388
|
|
32486
|
|
34456
|
|
42975
|
|
83603
|
|
35
|
|
.1100
|
|
28443
|
|
30722
|
|
32843
|
|
34835
|
|
43447
|
|
84522
|
|
34
|
|
.1110
|
|
28962
|
|
31283
|
|
33443
|
|
35472
|
|
44241
|
|
86066
|
|
33
|
|
.1130
|
|
30015
|
|
32420
|
|
34659
|
|
36761
|
|
45849
|
|
89195
|
|
32
|
|
.1160
|
|
31630
|
|
34165
|
|
36524
|
|
38739
|
|
48316
|
|
93994
|
|
31
|
|
.1200
|
|
33849
|
|
36562
|
|
39068
|
|
41457
|
|
51706
|
|
100588
|
|
1/8
|
|
.1250
|
|
36729
|
|
39672
|
|
42411
|
|
44984
|
|
56104
|
|
109145
|
|
30
|
|
.1285
|
|
38815
|
|
41924
|
|
44819
|
|
47538
|
|
59290
|
|
115343
|
|
29
|
|
.1360
|
|
43478
|
|
46961
|
|
50204
|
|
53249
|
|
66413
|
|
129200
|
|
28
|
|
.1405
|
|
46402
|
|
50120
|
|
53581
|
|
56831
|
|
70881
|
|
127992
|
|
9/64
|
|
.1406
|
|
46469
|
|
50192
|
|
53657
|
|
56912
|
|
70982
|
|
138088
|
|
27
|
|
.1440
|
|
48743
|
|
52649
|
|
56284
|
|
59698
|
|
74456
|
|
144847
|
|
26
|
|
.1470
|
|
50795
|
|