Example Of Piping System Design - Broaster 2400 Installation Manual

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):
Length
in
1/2
Feet
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
60 50 105
70 46
80 43
90 40
100 38
125 34
150 31
175 28
200 26
Nominal Iron Pipe Size, Inches
3/4 1 1 1/4
520 1,050
350 730
285 590
245 500
215 440
195 400
96 180 370
90 170 350
84 160 320
79 150 305
72 130 275
64 120 250
59 110 225
55 100 210
broaster.com Manual #15458 5/02 Rev 2/14
Solution:
Maximum gas demand for outlet A:
consumption (rating plate input or pipe cap. if necessary)
30,000 BTU per hour rating
1,000 BTU per cubic foot
Maximum gas demand for outlet B:
consumption 3,000
=
BTU of gas 1,000
Maximum gas demand for outlet C:
consumption
=
BTU of gas
Maximum gas demand for outlet D:
consumption 136,000
=
BTU of gas
1 1/2 2
1,600 3,050
1,100 2,100
890 1,650
760 1,450
670 1,270
610 1,150
560 1,050
530 990
490 930
460 870
410 780
380 710
350 650
320 610
3–6
BTU of gas
= 30 cubic feet per hour (30cfh)
= 3cfh
75,000
= 75cfh
1,000
= 136cfh
1,000
2 1/2 3
4,800 8,500
3,300 5,900
2,700 4,700
2,300 4,100
2,000 3,600
1,850 3,250
1,700 3,000
1,600 2,800
1,500 2,600
1,400 2,500
1,250 2,200
1,130 2,000
1,050 1,850
980 1,700
=
4
17,500
12,000
9,700
8,300
7,400
6,800
6,200
5,800
5,400
5,100
4,500
4,100
3,800
3,500