33
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 9. Natural Gas Heating Values
Table 8. High Altitude Deration Chart for Propane Gas
PROPANE GAS
ALTITUDE ABOVE
SEA LEVEL
INPUT (BTU)
45,000
54,000
72,000
90,000
108,000
126,000
0 to 1,999 FT
57
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
57
56
56
56
56
56
ORIFICE SIZE
9.0
9.0
9.0
9.0
9.0
9.0
MANIFOLD PRESSURE
3,000 to 4,999 FT
57
56
56
56
56
56
ORIFICE SIZE
8.5
8.5
8.5
8.5
8.5
8.5
MANIFOLD PRESSURE
5,000 to 5,999 FT
59
57
57
57
57
57
ORIFICE SIZE
10.0
10.0
10.0
10.0
10.0
10.0
MANIFOLD PRESSURE
6,000 to 7,999 FT
59
57
57
57
57
57
ORIFICE SIZE
9.0
9.0
9.0
9.0
9.0
9.0
MANIFOLD PRESSURE
8,000 to 10,000 FT
59
57
57
57
57
57
ORIFICE SIZE
8.5
8.5
8.5
8.5
8.5
8.5
MANIFOLD PRESSURE