Propane is a nontoxic gas. In comparison, methanol, gasoline,
diesel and ethanol are listed by the EPA as toxic liquids.
Methanol mixes readily with groundwater and is virtually
unremovable once it enters the soil or water supply. Propane
is released as a gas and will not contaminate soil or groundwater
supplies. Therefore, propane is exempt from the EPA's tough
underground storage regulations.
Propane is considered a safe motor fuel by the federal government.
School buses run on propane. Propane vehicle tanks are tested
to four times the normal operating pressures, and these
tanks are 20 times as puncture-resistant as gasoline, methanol
or ethanol vehicle tanks. Of methanol, ethanol, CNG or propane,
propane has the lowest flammability range--a safety advantage.
in the USA:
Over 88% of the current propane use in this country comes
from our own sources. Of this, 70% comes from the processing
of natural gas. The U.S., Canada and Mexico have extensive
natural gas reserves. The majority (75%) of imported propane
comes from Canada.
Approximately 97% of the U.S. propane supply is produced
in North America, and 88% of that is produced in the United
Since 1984, all new propane tanks are required to have a
device that shuts off the filling process when the tank
reaches 80% of its liquid capacity. This allows for changes
in fuel volume caused by temperature changes such as when
a car is driven from a frigid street into a heated garage.
Propane vehicle tanks are constructed from carbon steel
under a code developed by the American Society of Mechanical
Engineers (ASME). A propane tank is 20 times more puncture-resistant
than a typical gasoline, methanol or ethanol tank. In addition,
a properly installed propane tank can actually add to the
structural strength of a vehicle. Propane tanks are tested
at four times their normal pressure of 135 psi while CNG
tank's normal pressure is 3600 psi.