Dover HEIL Command-SST - CNG Vehicle Operator Emergency Response (Continued)

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Issued June 2020

Compressed Natural Gas (CNG) Option

Printed in U.S.A.

215

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 Management Module Manual Shut-

Off Valve.

3. Turn OFF the Fuel Cylinder Manual Shut-Off Valve

on EACH tank.

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.