Half/Pack
®
Issued April 2018
Compressed Natural Gas (CNG) Option
Copyright 2018, Heil Environmental
Printed in the U.S.A.
Compressed Natural Gas (CNG) Option
197
CNG VEHICLE OPERATOR EMERGENCY RESPONSE (CONTINUED)
CNG Vehicle Emergency Shut Down Procedure
Complete the following steps to shut down the CNG system:
1. Turn OFF Ignition and Electrical System.
2. Turn OFF Fuel Module Manual Shut-Off Valve.
3. Close each Tank Valve.
4. Call Technical Services at 866-310-4345 for further assistance.
Emergency Venting/Defueling Procedure
If an emergency arises in which the fuel must be purged immediately, an emergency vent can be performed as follows:
1. Ensure that an electrical ground connection has been established between the cylinders, the vent system, and earth
ground.
2. Connect the on-board defueling connection to the vent system using a conductive high pressure defueling hose.
3. Slowly open the hand valve to achieve a slow and steady flow to prevent freezing. No gas flow may indicate a
normally closed solenoid valve on the cylinder. Consult the vehicle manufacturer for information on opening
electronic solenoids.
4. Allow the on-board storage system to vent completely.
5. When completed, disconnect all connections.
CNG FUEL CYLINDER AND SYSTEM INSPECTIONS
WARNING
If a CNG-fueled vehicle has been involved in an accident or fire, the system and cylinders must be inspected by a certified
CNG fuel system inspector.
Inspections must be performed by qualified inspectors using guidelines from the fuel cylinder manufacturer in addition to
the guidelines listed here.
1. Based on cylinder manufacturer recommendations and industry standard practices, visual CNG cylinder inspections
should be performed at a frequency of 3 years or 36,000 miles, whichever occurs first.
2. In addition, Heil recommends a daily walk-around or pre-trip and post-trip visual inspection be performed.
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