Delta F-25 - Manual (Page 34)

29
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.
- 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.
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.
Length of Pipe
in Feet
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
Capacity of Pipe in Cubic Feet of Gas Per Hour
(based on 0.60 specific gravity, 0.30" w.c. pressure drop)
Table 1: Gas piping sizing - Natural Gas