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
