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Safety Info

Safety InfoTake the time to inspect your cylinder. If your cylinder was manufactured prior to 1988 and is due for requalification, (cylinders need to be requalified 12 years after the original date of manufacture and every five years thereafter) your valve must be replaced with an OPD. The date of manufacturer is located on the neck ring of the cylinder as a three or four digit number. Check the date on your cylinder to see if your tank needs to have the valve replaced. All propane cylinders will have to be equipped with an OPD prior to April 1, 2002 regardless of manufacture's date. Northwest Propane is prohibited by law from filling a cylinder that does not meet these guidelines. Bring your cylinder in the next time it needs to be filled and we can determine if your valve needs to be replaced.

Propane Properties
Average Properties of Propane
Formula C3H8
Boiling Point, °F -44
Specific Gravity of Gas Air = 1.00 1.53
Specific Gravity of Liquid Water = 1.00 0.51
Lbs. per Gallon of Liquid at 60°F 4.24
BTU per Gallon of Gas at 60°F 91,547
Btu per Lb. of Gas 21591
BTU per Cu. Ft. of Gas at 60°F 2516
Cu. Ft. of Vapor at 60°F/Gal of liquid at 60°F 36.39
Cu. Ft of Vapor at 60°F/Lb. of liquid at 60°F 8.547
Latent Heat of Vaporization at Boiling Point BTU/Gal. 785.0
Combustion Data
Cu. Ft. Air Required to Burn 1 Cu. Ft. of Gas 28.86
Flash Point, °F -156
Ignition Temperature in air, °F 920-1020
Maximum Flame Temperature in Air, °F 3595
Limits in Inflammability, Percentage of Gas in Air mixture
    at Lower Limit - % 2.4
    at upper Limit - % 9.6
Octane Number (ISO-Octane = 100) Over 100
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