Issued June 2020
Compressed Natural Gas (CNG) Option
Copyright 2020, Heil Environmental
Printed in U.S.A.
209
PROPERTIES OF NATURAL GAS
CNG is a naturally occurring hydrocarbon gas mixture
which consists primarily of methane. This gas is lighter than
air, which means if gas were to leak, it would float upwards
and quickly dissipate into the atmosphere.
CNG will burn only when in an air-to-gas mixture of
approximately 5-15% so its range of flammability is limited
compared to other fuels. The gas also has an ignition
temperature of 1076°F which is significantly higher than
diesel. As a fuel, CNG is less expensive and burns cleaner
than diesel fuel, producing low emissions. These
characteristics make CNG an efficient, safe choice for
fueling vehicles.
It is:
Colorless
Odorless
Non-corrosive
Non-toxic
It has an:
Auto Ignition Point: 900 - 1170° F (482 - 632°C)
Lower Explosive Limit (%): 3.8 – 6.5
Upper Explosive Limit (%): 13 – 17
SIGNS OF A FUEL LEAK
An odorant which smells like rotten eggs is added to
compressed natural gas to aid in detection of a leak. If you
notice this kind of lingering odor coming from your vehicle,
you may have a leak in the CNG fuel system.
NOTE: It is normal to detect this slight odor when the
fueling nozzle is being connected or disconnected during
the refueling process. The odor should quickly dissipate
when fueling has been completed.
If you notice any of the following, you may have a leak in
the CNG fuel system:
Frosting at suspected leak point
Bubbling in wet area
Blowing or hissing sound
Flames, if a leak has ignited
If a fuel leak is suspected, the system should be shut down
immediately. Refer to Fuel System Shut Down Procedure
. Have the unit inspected for leaks by a qualified service
technician using a methane detector or an approved liquid
leak detector. Do not use any other method or products to
find leaks.
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