comtherm_logo

USEFUL DATA

Tables & Charts:

» Drill Sizes
» Energy - Fuel Flow
» Temperature Conversions

Unit Conversion Factors

» Area
» Calorific Values
» Energy
» Force
» Length
» Mass
» Power
» Pressure
» Volume

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



TECHNICAL SUBJECTS

» Air Heating
» Combustion
» Controls
» Fan Application Engineering
» Metal Melting
» Standards

© 2009 Comtherm. All Rights Reserved

Comtherm Limited accepts no responsibility or liability for the accuracy of information provided on this web-page. technical data and dimensions should be confirmed with the relevant Comtherm Limited Sales or Technical office.