38
Table 13. High Altitude Deration Chart for Propane Gas
PROPANE DERATION CHART
ALTITUDE
ABOVE SEA
LEVEL
INPUT (BTU) & STAGE
60,000
80,000
100,000
120,000
1st 2nd 1st 2nd 1st 2nd
1st
2nd
0 to 1,999 FT
55
55
55
55
ORIFICE SIZE
4.2
10.0
4.2
10.0
4.2
10.0
4.2
10.0
MANIFOLD PRESSURE
2,000 to 2,999 FT
55
55
55
55
ORIFICE SIZE
4.2
9.0
4.2
9.0
4.2
9.0
4.2
9.0
MANIFOLD PRESSURE
3,000 to 4,999 FT
55
55
55
55
ORIFICE SIZE
4.2
8.5
4.2
8.5
4.2
8.5
4.2
8.5
MANIFOLD PRESSURE
5,000 to 5,999 FT
56
56
56
56
ORIFICE SIZE
4.2
10.0
4.2
10.0
4.2
10.0
4.2
10.0
MANIFOLD PRESSURE
6,000 to 7,999 FT
56
56
56
56
ORIFICE SIZE
4.2
9.0
4.2
9.0
4.2
9.0
4.2
9.0
MANIFOLD PRESSURE
8,000 to 10,000 FT
56
56
56
56
ORIFICE SIZE
4.2
8.5
4.2
8.5
4.2
8.5
4.2
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
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 14. Natural Gas Heating Values
Summary of Contents for *TC
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