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Basic Facts
Based on 60° Propane Butane
1 Cu. Ft. NG Approx 1,1000 BTU
Formula C3H8 C4H10
Vaporization Point (°F) -43.7 31.1
Specific Gravity (Vapor) 1.522 2.006
Specific Gravity (Liquid) 0.508 0.584
Lbs. per Gal. (Liquid) 4.23 4.87
BTU per Cu. Ft. (Vapor) 2.563 3.39
BTU per Gal. (Liquid) 91.547 102.032
BTU per Lb. (Liquid) 21.591 21.221
Cu. Ft. per Lb. (Liquid) 8.607 6.53
Cu. Ft. per Gal. (Liquid) 36.45 31.8
Octane Number 125 91
Molecular Weight 44.09 58.12
To Calculate Running Cost: 1,000 BTU = 1 Cu. Ft.
100 Cu. Ft. = 1 Therm
1 Therm = 1 Hour
Cost of Gas per Therm = Cost to Run
Example Using Natural Gas at 50¢ Therm: 400,000 BTU Machine
400 Cu. Ft. (400,000 / 1,000)
4 x 50¢ = $2.00 / Hour to Run ((400 / 100) x cost of gas)
Landa VHG Operator’s Manual 8.913-952.0 - BR
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