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HIGH ALTITUDE DERATION – PROPANE GAS
ALTITUDE ABOVE
SEA LEVEL
INPUT (BTU)
(SC MODELS)
(SD MODELS)
56 60 56 56 56 56 55 55 ORIFICE SIZE
10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 MANIFOLD PRESSURE
56 60 56 56 56 56 55 55 ORIFICE SIZE
9.0 9.0 9.0 9.0 9.0 9.0 9.0 9.0 MANIFOLD PRESSURE
56 60 56 56 56 56 55 55 ORIFICE SIZE
8.5 8.5 8.5 8.5 8.5 8.5 8.5 8.5 MANIFOLD PRESSURE
57 61 57 57 57 57 56 56 ORIFICE SIZE
10.0 8.5 10.0 10.0 10.0 10.0 10.0 10.0 MANIFOLD PRESSURE
57 61 57 57 57 57 56 56 ORIFICE SIZE
9.0 8.0 9.0 9.0 9.0 9.0 9.0 9.0 MANIFOLD PRESSURE
57 61 57 57 57 57 56 56 ORIFICE SIZE
8.5 7.5 8.5 8.5 8.5 8.5 8.5 8.5 MANIFOLD PRESSURE
LOCAL HEATING VALUES FOR NATURAL GAS
ALTITUDE ABOVE
SEA LEVEL
BTU PER CUBIC FOOT
650 700 750 800 850 900 950
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
Natural Gas Heating Values
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