Alliance Laundry Systems CHD25G2-CT025L - High Altitude Burner Orifice Sizing

Gas Requirements
Part No. 70458301ENR7
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Copyright, Alliance Laundry Systems LLC - DO NOT COPY or TRANSMIT 65
Gas Pipe Size Required for 1000 Btu Natural Gas — 0.64 Specific Gravity at 7 ± 1.5 inches
(17.4 ± 4 mbar, 1.74 ± 0.37 kPa) Water Column Pressure
Equivalent Length
25 feet
(7.63 m)
50 feet
(15.25 m)
75 feet
(22.88 m)
100 feet
(30.50 m)
125 feet
(38.13 m)
150 feet
(45.75 m)
GasAppliances
Total Btu/hr.
Based on 0.3 in. Water Column Pressure Drop for Length Given
Sizes shown in inches (mm)
1,300,000 2 (50.80) 2.5 (63.50) 2.5 (63.50) 2.5 (63.50) 2.5 (63.50) 3 (76.20)
1,400,000 2 (50.80) 2.5 (63.50) 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20)
1,500,000 2 (50.80) 2.5 (63.50) 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20)
1,600,000 2 (50.80) 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20)
1,700,000 2 (50.80) 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20)
1,800,000 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20) 3 (76.20)
1,900,000 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20) 3 (76.20)
2,000,000 2.5 (63.50) 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20) 3.5 (88.90)
2,200,000 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20) 3.5 (88.90) 3.5 (88.90)
2,400,000 2.5 (63.50) 3 (76.20) 3 (76.20) 3 (76.20) 3.5 (88.90) 3.5 (88.90)
2,600,000 2.5 (63.50) 3 (76.20) 3 (76.20) 3.5 (88.90) 3.5 (88.90) 3.5 (88.90)
2,800,000 2.5 (63.50) 3 (76.20) 3 (76.20) 3.5 (88.90) 3.5 (88.90) 3.5 (88.90)
3,000,000 2.5 (63.50) 3 (76.20) 3.5 (88.90) 3.5 (88.90) 3.5 (88.90) 4 (101.60)
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 5
High Altitude Burner Orifice Sizing