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ORIFICE TABLES  -   NATURAL GAS

Jet Dia. mm. Jet Area sq.cm. GAS FLOW (C.M.H.) - Natural Gas - at gas pressure ( mbar)
This table assumes a discharge coefficient for the jet of 0.9. & a gas specific gravity of 0.6.
    2 3 4 5 6 7 8 9 10 12
0.5 0.0020 0.01 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.04
0.6 0.0028 0.02 0.03 0.03 0.03 0.04 0.04 0.04 0.04 0.05 0.05
0.7 0.0038 0.03 0.04 0.04 0.05 0.05 0.05 0.06 0.06 0.06 0.07
0.8 0.0050 0.04 0.05 0.05 0.06 0.07 0.07 0.08 0.08 0.08 0.09
0.9 0.0064 0.05 0.06 0.07 0.08 0.08 0.09 0.10 0.10 0.11 0.12
1.0 0.0079 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.12 0.13 0.14
1.1 0.0095 0.07 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17
1.2 0.0113 0.08 0.10 0.12 0.13 0.15 0.16 0.17 0.18 0.19 0.21
1.3 0.0133 0.10 0.12 0.14 0.16 0.17 0.19 0.20 0.21 0.22 0.24
1.4 0.0154 0.12 0.14 0.16 0.18 0.20 0.22 0.23 0.24 0.26 0.28
1.5 0.0177 0.13 0.16 0.19 0.21 0.23 0.25 0.26 0.28 0.30 0.32
1.6 0.0201 0.15 0.18 0.21 0.24 0.26 0.28 0.30 0.32 0.34 0.37
1.7 0.0227 0.17 0.21 0.24 0.27 0.29 0.32 0.34 0.36 0.38 0.42
1.8 0.0255 0.19 0.23 0.27 0.30 0.33 0.36 0.38 0.40 0.43 0.47
1.9 0.0284 0.21 0.26 0.30 0.34 0.37 0.40 0.42 0.45 0.47 0.52
2.0 0.0314 0.24 0.29 0.33 0.37 0.41 0.44 0.47 0.50 0.53 0.58
2.5 0.0491 0.37 0.45 0.52 0.58 0.64 0.69 0.74 0.78 0.82 0.90
3.0 0.0707 0.53 0.65 0.75 0.84 0.92 0.99 1.06 1.12 1.18 1.30
3.5 0.0962 0.72 0.88 1.02 1.14 1.25 1.35 1.44 1.53 1.61 1.77
4.0 0.1257 0.94 1.15 1.33 1.49 1.63 1.76 1.88 2.00 2.11 2.31
4.5 0.1591 1.19 1.46 1.69 1.88 2.06 2.23 2.38 2.53 2.66 2.92
5.0 0.1964 1.47 1.80 2.08 2.33 2.55 2.75 2.94 3.12 3.29 3.60
5.5 0.2376 1.78 2.18 2.52 2.81 3.08 3.33 3.56 3.78 3.98 4.36
6.0 0.2828 2.12 2.59 3.00 3.35 3.67 3.96 4.24 4.49 4.74 5.19
6.5 0.3319 2.49 3.04 3.52 3.93 4.31 4.65 4.97 5.27 5.56 6.09
7.0 0.3849 2.88 3.53 4.08 4.56 4.99 5.39 5.77 6.12 6.45 7.06
7.5 0.4418 3.31 4.05 4.68 5.23 5.73 6.19 6.62 7.02 7.40 8.11
8.0 0.5027 3.77 4.61 5.33 5.95 6.52 7.05 7.53 7.99 8.42 9.22
8.5 0.5675 4.25 5.21 6.01 6.72 7.36 7.95 8.50 9.02 9.51 10.41
9.0 0.6363 4.77 5.84 6.74 7.54 8.26 8.92 9.53 10.11 10.66 11.68
9.5 0.7089 5.31 6.50 7.51 8.40 9.20 9.94 10.62 11.27 11.87 13.01
10.0 0.7855 5.88 7.21 8.32 9.30 10.19 11.01 11.77 12.48 13.16 14.41
10.5 0.8660 6.49 7.95 9.17 10.26 11.24 12.14 12.97 13.76 14.51 15.89
11.0 0.9505 7.12 8.72 10.07 11.26 12.33 13.32 14.24 15.10 15.92 17.44
11.5 1.0388 7.78 9.53 11.01 12.30 13.48 14.56 15.56 16.51 17.40 19.06
12.0 1.1311 8.47 10.38 11.98 13.40 14.68 15.85 16.95 17.97 18.95 20.76
12.5 1.2273 9.19 11.26 13.00 14.54 15.92 17.20 18.39 19.50 20.56 22.52
13.0 1.3275 9.94 12.18 14.06 15.72 17.22 18.60 19.89 21.10 22.24 24.36
13.5 1.4316 10.72 13.13 15.17 16.96 18.57 20.06 21.45 22.75 23.98 26.27
14.0 1.5396 11.53 14.13 16.31 18.24 19.98 21.58 23.07 24.47 25.79 28.25
14.5 1.6515 12.37 15.15 17.50 19.56 21.43 23.15 24.74 26.24 27.66 30.30
15.0 1.7674 13.24 16.22 18.72 20.93 22.93 24.77 26.48 28.09 29.60 32.43
15.5 1.8872 14.14 17.31 19.99 22.35 24.49 26.45 28.27 29.99 31.61 34.63
16.0 2.0109 15.06 18.45 21.30 23.82 26.09 28.18 30.13 31.96 33.68 36.90
16.5 2.1385 16.02 19.62 22.66 25.33 27.75 29.97 32.04 33.98 35.82 39.24
17.0 2.2701 17.01 20.83 24.05 26.89 29.45 31.81 34.01 36.07 38.03 41.66
17.5 2.4056 18.02 22.07 25.49 28.49 31.21 33.71 36.04 38.23 40.30 44.14
18.0 2.5450 19.07 23.35 26.96 30.14 33.02 35.67 38.13 40.44 42.63 46.70
18.5 2.6884 20.14 24.67 28.48 31.84 34.88 37.68 40.28 42.72 45.03 49.33
19.0 2.8357 21.24 26.02 30.04 33.59 36.79 39.74 42.48 45.06 47.50 52.03
19.5 2.9869 22.38 27.40 31.64 35.38 38.75 41.86 44.75 47.46 50.03 54.81
20.0 3.1420 23.54 28.83 33.29 37.22 40.77 44.03 47.07 49.93 52.63 57.65
20.5 3.3011 24.73 30.29 34.97 39.10 42.83 46.26 49.46 52.46 55.30 60.57
21.0 3.4641 25.95 31.78 36.70 41.03 44.95 48.55 51.90 55.05 58.03 63.56
21.5 3.6310 27.20 33.31 38.47 43.01 47.11 50.89 54.40 57.70 60.82 66.63
22.0 3.8018 28.48 34.88 40.28 45.03 49.33 53.28 56.96 60.42 63.68 69.76
22.5 3.9766 29.79 36.48 42.13 47.10 51.60 55.73 59.58 63.19 66.61 72.97
23.0 4.1553 31.13 38.12 44.02 49.22 53.92 58.24 62.26 66.03 69.60 76.25
23.5 4.3379 32.50 39.80 45.96 51.38 56.29 60.79 64.99 68.93 72.66 79.60
24.0 4.5245 33.89 41.51 47.93 53.59 58.71 63.41 67.79 71.90 75.79 83.02
24.5 4.7150 35.32 43.26 49.95 55.85 61.18 66.08 70.64 74.93 78.98 86.52
25.0 4.9094 36.78 45.04 52.01 58.15 63.70 68.80 73.55 78.02 82.24 90.09

  Gas & Air Flow

  Derivation of Orifice Gas Flow Formula
  Gas Orifice Tables



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