HEIL PT 1000, Operation Manual

Page: 171 / 202

Issued September 2017
Compressed Natural Gas (CNG) Option Copyright 2017, Heil Environmental
Printed in U.S.A.
163
CNG VEHICLE OPERATOR EMERGENCY
RESPONSE (CONTINUED)
CNG Vehicle Emergency Shut Down Procedure
WARNING
During an emergency situation, never jeopardize safety to
shut down the system. If it becomes evident that the steps
cannot be safely completed, move to a safe distance, call
9-1-1 and alert emergency personnel of the situation,
informing them of the presence of a CNG system and that
it is not properly shut down.
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 the on-board defueling
connection from the vent system and disconnect the
earth ground.