Delta 40, F-25 Fuel Piping, Pipe Sizing - Natural Gas, Natural Gas Supply Pressure Requirements

Fuel Piping

Pipe Sizing - Natural Gas

1.Refer to Table 1 for pipe length and diame- ter requirements. Based on rated ELITE input (divide by 1,000 to obtain cubic feet per hour).

-Table 1 is based on Natural Gas with a specific gravity of 0.60 and a pressure drop through the gas piping of 0.30”w.c..

-For additional gas piping sizing infor- mation, refer to ANSI Z223.1. For Canadian installations refer to B149.1 or B149.2.

Natural Gas Supply Pressure Requirements

1.Pressure required at the gas valve inlet supply pressure port:

-Maximum 13”w.c. at flow or no flow conditions to the burner.

Pipe Sizing - Propane Gas

1.Contact the local propane gas supplier for recommended sizing of piping, tanks and 100% lockup gas regulator.

Propane Gas Supply Pressure Requirements

1.Adjust the propane supply regulator pro- vided by the gas supplier for 13”w.c. max- imum pressure

2.Pressure required at the gas valve inlet sup- ply pressure port:

-Maximum 13”w.c. at flow or no flow conditions to the burner

-Minimum 5”w.c. during flow condi- tions to the burner. Must be verified during start up.

- Minimum 5”w.c. during flow condi- tions to the burner. Must be verified during start up.

2.Install 100% lockup gas pressure regulator in the gas supply line if inlet pressure can exceed 13”w.c at any time. Adjust the lock- up pressure regulator for 13”w.c maximum.

Table 1: Gas piping sizing - Natural Gas

Length of Pipe		Capacity of Pipe in Cubic Feet of Gas Per Hour
in Feet	(based on 0.60 specific gravity, 0.30" w.c. pressure drop)
SCH 40
	1/2"		3/4"		1"	1-1/4"	1-1/2"
10	132		278		520	1050	1600
20	92		190		350	730	1100
30	73		152		285	590	860
40	63		130		245	500	760
50	56		115		215	440	670
75	45		93		175	360	545
100	38		79		150	305	460
150	31		64		120	250	380
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