36
ALTITUDE ABOVE
SEA LEVEL
LOCAL HEATING VALUE, BTU PER CUBIC FOOT
650 700 750 800 850 900 950 1,000 1,050
2,000 FT LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH
3,000 FT LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH
4,000 FT LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH
5,000 FT LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH
6,000 FT LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH
7,000 FT LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH
8,000 FT LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH
9,000 FT LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH
10,000 FT LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH
Table 11. Natural Gas Heating Values
Table 10. High Altitude Deration Chart for Propane Gas
PROPANE GAS
ALTITUDE ABOVE
SEA LEVEL
INPUT (BTU)
38,000 54,000 72,000 90,000 108,000 120,000
0 to 1,999 FT
56 56 56 56 56 56 ORIFICE SIZE
10.0 10.0 10.0 10.0 10.0 10.0 MANIFOLD PRESSURE
2,000 to 2,999 FT
56 56 56 56 56 55 ORIFICE SIZE
9.0 9.0 9.0 9.0 9.0 9.0 MANIFOLD PRESSURE
3,000 to 4,999 FT
56 56 56 56 56 55 ORIFICE SIZE
8.5 8.5 8.5 8.5 8.5 8.5 MANIFOLD PRESSURE
5,000 to 5,999 FT
57 57 57 57 57 56 ORIFICE SIZE
10.0 10.0 10.0 10.0 10.0 10.0 MANIFOLD PRESSURE
6,000 to 7,999 FT
57 57 57 57 57 56 ORIFICE SIZE
9.0 9.0 9.0 9.0 9.0 9.0 MANIFOLD PRESSURE
8,000 to 10,000 FT
57 57 57 57 57 56 ORIFICE SIZE
8.5 8.5 8.5 8.5 8.5 8.5 MANIFOLD PRESSURE