PB Heat Gas/Oil Boilers manual Pipe Length, Specific Gravity Multiply Capacity by

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.

Pipe Length	1-1/4"	1-1/2"	2"	2-1/2"	3"	4"	6"
(Feet)	Pipe	Pipe	Pipe	Pipe	Pipe	Pipe	Pipe
10	1050	1600	3050	4800	8500	17500	44000
20	730	1100	2100	3300	5900	12000	31000
30	590	890	1650	2700	4700	9700	25000
40	500	760	1450	2300	4100	8300	22000
50	440	670	1270	2000	3600	7400	20000
60	400	610	1150	1850	3250	6800	18000
70	350	560	1050	1700	3000	6200	17000
90	320	490	930	1500	2600	5400	15000
100	305	460	870	1400	2500	5100	14000
150	250	380	710	1130	2000	4100	11500

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	0.50	0.55	0.60	0.65	0.70
Multiply Capacity by:	1.10	1.04	1.00	0.962	0.926

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