PB Heat Gas/Oil Boilers - Manual (Page 34)

32
CONNECT FUEL PIPING
Table 7.1: Capacity of Gas Supply Pipe in Cubic Feet Per Hour of Natural Gas for Pressure Drop of
0.3 inch Water Column.
10
20
30
40
50
60
70
90
100
150
1050
730
590
500
440
400
350
320
305
250
1600
1100
890
760
670
610
560
490
460
380
3050
2100
1650
1450
1270
1150
1050
930
870
710
4800
3300
2700
2300
2000
1850
1700
1500
1400
1130
8500
5900
4700
4100
3600
3250
3000
2600
2500
2000
17500
12000
9700
8300
7400
6800
6200
5400
5100
4100
44000
31000
25000
22000
20000
18000
17000
15000
14000
11500
Pipe Length
(Feet)
1-1/4"
Pipe
1-1/2"
Pipe
2"
Pipe
2-1/2"
Pipe
3"
Pipe
4"
Pipe
6"
Pipe
Above ratings based on natural gas with specific gravity of 0.60 allowing pressure drop of 0.3 inches water column. No allowance is needed for
pipe fittings. Use the following multipliers on above capacities for specific gravity other than 0.60:
Specific Gravity
Multiply Capacity by: 1.10
0.50
1.04
0.55
1.00
0.60
0.962
0.65
0.926
0.70