2-13
GAS PIPE CHART (NATURAL GAS)
EXAMPLE:
The dryer has a rating of 30,000 BTU. If the
average BTU rating of natural gas is 1000,
divide 30,000 by 1000 and get 30. If for
example, eight dryers are to be operated on a
gas line, the following gures would be used:
30 Cubic feet per hour each
X 8 Dryers
240 Total cubic feet of gas per hour
Let’s assume 40 feet of pipe is required.
Here’s how to use the chart:
Look across the top of the chart and find 40
feet of pipe.
Look down into the body of the chart to get
to, or just over the maximum needed cubic
feet of gas per hour. In this case it will be
245.
Look to the left column and see a 1” pipe is
required.
1.
2.
3.
The chart shows the maximum capacity in
terms of cubic feet of gas per hour, for various
sizes of pipe at lengths of from 10 feet to 200
feet. The column on the left is the nominal
iron pipe size shown in inches. Sizes range
from 1/4” to 4”. The next column shows the
internal diameter of the pipe in decimal inches.
The numbers across the top of the chart are
lengths of pipe from 10 feet up to 200 feet.
The numbers in the body of the chart are
maximum capacities of cubic feet of gas per
hour.
To determine the cubic feet of gas required
per hour, divide the total BTU input of all the
dryers which will be on the line by the average
BTU heating value per cubic foot of the gas
used.
Nominal
iron
pipe
size,
inches
Internal
diameter
inches
Length of pipe, feet
10 20 30 40 50 60 70 80 90 100 125 150 175 200
1/4 .364 32 22 18 15 14 12 11 11 10 9 8 8 7 6
3/8 .493 72 49 40 34 30 27 25 23 22 21 18 17 15 14
1/2 .622 132 92 73 63 56 50 46 43 40 38 34 31 28 26
3/4 .842 278 190 152 130 115 105 96 90 84 79 72 64 59 55
1 1.048 520 350 285 245 215 195 160 170 160 150 130 120 110 100
1 1/4 1.380 1050 730 590 500 440 400 370 350 320 305 275 250 225 210
1 1/2 1.610 1600 1100 890 760 670 610 560 530 490 400 410 380 350 320
2 2.087 3050 2100 1650 1450 1270 1150 1050 990 930 870 780 710 650 610
2 1/2 2.169 4860 3300 2700 2300 2000 1850 1700 1600 1500 1400 1250 1130 1050 980
3 3.068 8500 5900 4700 4100 3600 3250 3000 2800 2600 2500 2200 2000 1850 1700
4 4.026 17,500 12,000 9700 8300 7400 6800 6200 5800 5400 5100 4500 4100 3800 3500
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