Mack LEU, Operator'S Handbook Manual

Page: 26 / 59

22 OPERATION
1 Fill Connection to Second Fuel Tank — When fueling, LNG will enter the
second vessel through this connecting pipe.
2 Manual Vent — This valve is clearly marked with OPEN and CLOSE directional
arrows. It is normally kept closed, but may be opened to bleed the tank or in certain
fueling situations which are described in the section "LNG Fueling."
Note: There is normally no need to manually vent the tank. The vessel is protected
from over-pressurization by several automatic safety relief valves.
3 Fuel Tank Pressure Gauge — Each tank has a separate pressure gauge. The
normal operating pressure of the tanks is approximately 120 psi or higher. Normal
procedure is to refuel on a daily basis or each time the vehicle is taken into active
service.
4 Tank Manufacturer’s Manual — Located inside the bottom half of the tank door.
As the label indicates, this manual should be read entirely before operating the tank.
5
Evacuation Plug (Do Not Remove) —
The LNG fuel tank is equipped with an
outer jacket evacuation plug that will pop open if there is a loss of vacuum. The
loss of the evacuation plug indicates an inner vessel leak. The evacuation plug is
protected from the environment and tampering by a plastic cap. Do not remove the
plastic cap or evacuation plug.
6
Fuel Shut-Off Valve —
This valve is clearly marked with OPEN and CLOSE
directional arrows. During normal operation, the valve should remain fully open to
allow fuel to reach the engine. Close this valve to shut off fuel to the engine.
Note: If there is more than one tank, both tank valves must be turned off to shut
off fuel to the engine.
7 Excessive Flow Valve — Restricts excess fuel flow in the event of a fuel line
breakage.
8
Fuel Tank Fill Fitting —
Filling the LNG vehicle fuel tanks is done through a
single hose connected to the fill fitting. Instructions on filling the fuel tanks are
under the section "LNG Fueling."
9 Fuel Gauge Sending Unit — Receives signals from the tank probe and converts
them into values compatible with the fuel gauge. The sending unit is sealed and
non-adjustable.
10 Fuel Tank Level Probe — Senses the fuel level in the tank.
During the daily walk around inspection, if you see any signs of a methane leaks as
previously mentioned in the
SAFETY section of this handbook, open the tank door. If
the Evacuation Plug has popped out, the tank must be serviced before operating.