Section 7 --- LP-Gas Systems
Cayman 2005
242
The above capacities allow for 20% vapor space on each cylinder.
Data taken from the National Fire Prevention Association (NFPA). Pamphlet #58-1998.
CONVERSIONS
Gallons to Liters (1 Gallon = 3.785 Liters)
Fahrenheit to Celsius (F° - 32 ÷ 1.8 = C°)
11 in. Water Column = 6 1/4 ozs. per sq. in. pressure.
27.7 in. Water Column = 1 lb. per sq. in. pressure.
# Capacity Gallon Capacity BTU Capacity
5 1.18 107,909
10 2.36 215,807
11 2.59 237,387
20 4.72 431,613
30 7.08 647,420
40 9.43 863,226
LP-GAS FUNDAMENTALS
LP-Gas Statistics:
Pounds Per Gallon
Specific Gravity of Gas
Specific Gravity of Liquid
Cubic Feet Gas Per Gallon of Liquid
Cubic Feet Gas Per Pound
BTU Per Gallon
BTU Per Pound
Dew Point in Degrees Fahrenheit
Vapor Pressure at 0° F
Vapor Pressure at 70° F
Vapor Pressure at 100° F
Vapor Pressure at 110° F
Flash Point
4.24
1.50
.504
36.38
8.66
91,502
21,548
- 44° F
31
127
196
230
842° F
Basic Facts About LP-Gas:
• LP-Gas detectors are a federal requirement
on all LP-Gas equipped recreation vehicles.
• LP-Gas is a by-product produced by refining oil.
• Odor is added to LP-Gas after the refining
process.
• Each liquid gallon of LP-Gas produces 91,502
BTU (British Thermal Units).
• Temperature affects pressure of LP-Gas.
Internal tank pressure can exceed 200 psi.
• Tanks or valves contain pressure relief valves.
The relief valve opens at 125% above tank rat-
ing.
• LP-Gas stops vaporizing at -44º F.
• Standard LP-Gas operating pressure is 11" of
Water Column or approximately 6 ¼ ounces
per square inch.
• An inch of Water Column is a measurement of
applied pressure to one side of a U-Tube ½
filled with water at sea level. The amount of
pressure required to raise the water level 11",
represents 11” of Water Column.
NOTE:
The above information is not a complete guide for the use of LP-Gas tanks or
appliances. In cold climates keep fuel levels above 50% in order to keep vapor-
ization of LP-Gas at the highest level.
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