3–6
Example of Piping System Design:
Determine the required pipe size of each
section and outlet of the piping system
shown in Solution, with a designated pres-
sure drop of 0.30 inch water column. Gas
to be used has 0.60 specific gravity and a
heating value of 1,000 BTU per cubic foot.
Maximum capacity of pipe in cubic feet of
gas per hour (based upon a pressure drop
of 0.3 inch water column and 0.6 specific
gravity gas):
consumption (rating plate input or pipe cap. if necessary)
BTU of gas
=
30,000 BTU per hour rating
1,000 BTU per cubic foot
= 30 cubic feet per hour (30cfh)
Maximum gas demand for outlet B:
consumption
BTU of gas
Solution:
Maximum gas demand for outlet A:
=
3,000
1,000
= 3cfh
Maximum gas demand for outlet C:
consumption
BTU of gas
75,000
1,000
=
= 75cfh
Maximum gas demand for outlet D:
consumption
BTU of gas
136,000
1,000
=
= 136cfh
Length
in
Feet
Nominal Iron Pipe Size, Inches
1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4
10 132 278 520 1,050 1,600 3,050 4,800 8,500 17,500
20 92 190 350 730 1,100 2,100 3,300 5,900 12,000
30 73 152 285 590 890 1,650 2,700 4,700 9,700
40 63 130 245 500 760 1,450 2,300 4,100 8,300
50 56 115 215 440 670 1,270 2,000 3,600 7,400
60 50 105 195 400 610 1,150 1,850 3,250 6,800
70 46 96 180 370 560 1,050 1,700 3,000 6,200
80 43 90 170 350 530 990 1,600 2,800 5,800
90 40 84 160 320 490 930 1,500 2,600 5,400
100 38 79 150 305 460 870 1,400 2,500 5,100
125 34 72 130 275 410 780 1,250 2,200 4,500
150 31 64 120 250 380 710 1,130 2,000 4,100
175 28 59 110 225 350 650 1,050 1,850 3,800
200 26 55 100 210 320 610 980 1,700 3,500
broaster.com Manual #15458 5/02 Rev 2/14
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