Nordyne M3RL 080A BWT - Gas Pipe Capacity and Orifice Sizing; Black Iron Gas Pipe Capacities Table; Approximate Orifice Size Table

NOMINALBLACK
IRONPIPE 10
DIAMETER_
1/2 130
3/4 280
1 520
1 1/4 1,050' 730' 590
1 1/2 1,600 1,100 890
LENGTH OF PIPE BUN (FT)
90 75
190 150
350 285
65 55
i30' 115
245 215
500' 440
760 670
NOTES
50 45 40
i05 95 90
195 180 170
i i
400 370 350
610
The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the
furnace. To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the
heating value (from gas supplier) of the gas.
input To Furnace (Btu/hr)
Cubic Feet Per Hour Required =
Heating Value of Gas (Btu/Cu. Ft.)
Table 11. Black Iron Gas Pipe Capacities
IVlodel Heating
Number Input
IVl3RL- (Btuh)
Number
of
Burners
060A-A!BW 60,000 4
080A-A!BW 80,000 5
Altitude Above Sea Level
0 - 2,000 ft
Nat. Gas LP
2,000 ft - 4,000 ft 4,000 - 6,000 ft
Nat. Gas LP Nat. Gas LP
6,000 - 8,000 ft 8,000 - 10,000 ft
Nat. Gas LP Nat. Gas LP
50 57 50 57 51 58 51 58 52 59
49 1.15mm 49 1.15mm 50 57 50 57 51 58
Table 12. Approximate Orifice Size for Natural and LP Gases
34