Operations Manual

Gas Pipe Size Required for 1000 BTU Natural Gas (Standard Conditions) at Upstream Pressure — 2 ± 0.4 PSI
[138 ± 28 mbar, 13.7 ± 2.7 kPa]
Gas Appli-
ances Total
BTU/hr.
Equivalent Length
25 feet [7.6
m]
50 feet
[15.2 m]
75 feet
[22.9 m]
100 feet [30
m]
125 feet [38
m]
150 feet [46
m]
Based on 1 PSI Pressure Drop for Length Given
Sizes shown in Gas Pipe Nominal Size (NPT)
1,700,000 3/4 1 1 1 1 1-1/4
1,800,000 3/4 1 1 1 1 1-1/4
1,900,000 3/4 1 1 1 1 1-1/4
2,000,000 3/4 1 1 1 1-1/4 1-1/4
2,200,000 3/4 1 1 1-1/4 1-1/4 1-1/4
2,400,000 1 1 1 1-1/4 1-1/4 1-1/2
2,600,000 1 1 1-1/4 1-1/4 1-1/4 1-1/2
2,800,000 1 1 1-1/4 1-1/4 1-1/4 1-1/2
3,000,000 1 1 1-1/4 1-1/4 1-1/4 1-1/2
For L.P. Gas, correct the total Btu/hr by multiplying it by 0.6. The answer is the equivalent Btu on the above chart.
Table 6
High Altitude Burner Orifice Sizing
For proper operation at altitudes above 2000 feet [610 m], the gas
burner orifice size must be reduced to ensure complete combus-
tion. Refer to Table 7 .
For CE models, consult local gas supplier.
Gas Requirements
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49 Part No: 70457901ENR14