How to refuel CNG Vehicles

How to refuel CNG Vehicles
R A IL R O A D
C O M M ISSI O N
O F
T E X A S
Refueling CNG Vehicles
It is important that individuals operating a compressed
natural gas (CNG) fuel dispenser know the properties of
CNG and be trained on the procedures for safely filling a
CNG-fueled vehicle.
Dispensing equipment may differ among CNG facilities.
To ensure each CNG fueling process is performed safely,
all operating instructions provided by the owner or
operator of the facility must be followed.
If you have any safety questions or concerns about CNG
refueling, you should contact the dispenser site manager
or your supervisor. Your employer may have procedures
for you to follow in addition to those listed below.
Connectors: The conventional fueling connector
complies with the national NGV-1 standard.
Before
You Begin
CNG refueling systems: CNG vehicular fuel systems
are typically designed to operate at either 3,600 psig or
3,000 psig. Most late-model vehicles have 3,600-psig fuel
systems, and older models have 3,000-psig fuel systems.
Each CNG fuel system is equipped with a filling receptacle
on the vehicle designed to connect to a compatible fill
nozzle on the transfer hose.
Fill nozzles are sized and may be color-coded by the
manufacturer based on the service pressure for which
they are designed. For example, one manufacturer’s fill
nozzle designed for a 3,600-psig system is color-coded
yellow and is slightly smaller than the fill nozzle designed
for a 3,000-psig system, which is color-coded blue.
The service pressure of a vehicle’s CNG fuel system is
provided on a durable, readily visible label at the fueling
connection receptacle on the vehicle.
STEP 1
Review all the instructions posted at the
dispensing station. Follow the instructions while
filling your vehicle. A company with an on-site
CNG fueling facility may have specific personal
protective equipment requirements for employees
fueling CNG vehicles.
Make sure the engine and vehicle accessories
are turned off and there is no ignition source
within 10 feet. Ignition sources include, but are
not limited to, an open flame, open light switch,
all smoking materials, pilot lights, and nonexplosion-proof lights.
Visually inspect the dispenser and its transfer
hose to determine they are in good condition. If
they are damaged, do not use them. Report the
damage to the facility owner or operator.
Refueling cng Vehicles
Prepare the
Connection
STEP 2
Remove the dust cap from the vehicle’s
fueling connection receptacle. The service
pressure of the vehicle’s CNG system—3,600
psi or 3,000 psi—is listed on the label next to
the fueling connection receptacle.
STEP 3
Follow any instructions provided by the
CNG facility’s owner or operator when
connecting a CNG transfer hose to the
fueling connection receptacle on the vehicle.
The fill nozzle on the hose is typically joined
to the receptacle either (1) by pushing it on
until an audible click is heard, indicating
that the nozzle is properly connected for safe
refueling, OR (2) for lever-type nozzles, by
turning the lever 180 degrees (one-half turn)
clockwise to secure the connection.
Connect the Transfer
Hose to the Vehicle
Refueling cng Vehicles
Fill the Tank
STEP 4
After securing the fill nozzle to the fueling
connection receptacle, follow the instructions
provided by the facility owner or operator to
start the transfer of fuel. For facilities with an
automatic dispenser, this may require running
your credit card through a card reader.
At a facility with a manually operated
dispenser, you may be instructed to ask the
operator to turn the dispenser on, or you may
be required to follow the written instructions
provided by the facility owner or operator.
When the CNG tanks on the vehicle are filled
to the service pressure, the dispensing system
will automatically stop the flow of gas.
STEP 5
Follow the facility’s instructions for disconnecting from
the fueling connection receptacle. If using a lever-type
fill nozzle, turn the lever back to its original position.
Disconnect the nozzle by pulling back on the collar of the
connector and hang the hose on the dispenser.
Some newer nozzles use a push-on, pull-off connector that
has no lever. On these systems, disconnect the hose by
pulling back on the collar of the connector and hang the
hose on the dispenser. Other nozzles may have a trigger
that needs to be released.
Whatever nozzle is used, a brief hissing or popping sound
may be heard when the nozzle is disconnected from the
fueling receptacle.
After Filling
Refueling cng Vehicles
STEP 6
Replace the dust cap on the vehicle’s fueling
connector receptacle, to keep out dirt and
moisture.
NOTE: The equipment shown in these photographs may differ from the equipment
installed at your CNG refueling station. However, the same procedure still applies.
FOR MORE INFORMATION:
RAILROAD COMMISSION OF TEXAS
RAILROAD COMMISSION OF TEXAS
ALTERNATIVE ENERGY DIVISION
1701 N. Congress • Austin, TEXAS 78701
www.altenergy.rrc.state.TX.us • (800) 64–CLEAR
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