1. Emergency fuel supply valve monitoring
Some of the major controls and monitoring systems are
discussed briefly in the following paragraphs.
2. Supply cutoff valve control and monitoring
3. Fuel supply pressure monitoring
Fuel Oil Service System
The fuel pressure entering the GTE is monitored on
an edgewise meter located on the PCC. The supply
The fuel oil service system supplies fuel to the
cutoff valve control at the PCC is provided by an
GTEs. The control and monitoring function available at
alternate-action switch that is inoperative when local
the PCC can be divided into two major categories: fuel
lockout is in effect. The fuel oil supply cutoff valve is a
oil service and gas turbine module fuel oil. Together they
normally-closed, energized open valve that fails to the
function to deliver fuel oil at the proper pressure and
closed position upon loss of power. A split-legend
temperature to the individual propulsion GTEs.
indicator provides the status of the fuel supply cutoff
FUEL OIL SERVICES. The following fuel oil
valve.
service control and monitoring functions are available
The gas turbine emergency supply valve is a
at the PCC:
normally-open, energized closed valve that fails to the
1. Fuel oil service tank level monitoring
o p e n position upon loss of electrical power. A
s p l i t - l e g e n d indicator provides the status of the
2. Fuel oil service tank suction and return valves
emergency fuel supply valve.
control and monitoring
3. Service pump suction valve monitoring
Lube Oil System
4. Service pump control and monitoring
The reduction gear lubricating oil service system
5. Service pump discharge valve monitoring
consists of two main parallel branches, each containing
6. F u e l o i l h e a t e r d i s c h a r g e t e m p e r a t u r e
a pump and a relief valve. An air motor drives a
monitoring
coastdown pump that provides lube oil automatically
7. Fuel oil prefilter strainer differential pressure
upon loss of electrical power to both lube oil pumps.
monitoring
The right most panel on the PCC center section is
8. Fuel oil filter/separator differential pressure
t h e auxiliary panel that provides the control and
monitoring
monitoring for the MRG lube oil system. The normal
pump assignment signal to the indicator on the PCC
PCC control of the fuel oil service system consists
of remote control of the suction and return valves and
comes from the position of the local transfer switch at
automatic or remote manual control of the fuel oil
the lube oil service pump control station. The manual
service pumps.
operation requires the operator to start, stop or change
speeds of the normal and standby pumps. The auto speed
The suction and return motor-operated valves are
advance mode increases the speed of the normal pump,
electrically connected so when the tank suction valve is
starts the standby pump, and increases speed of the
opened, the return valve also opens. An OPEN/CLOSE
standby pump to maintain lube oil pressure. Lube oil
alternate-action push button controls the valves from the
pressure is monitored at the most remote bearing for the
PCC. The split-legend indicator provides the OPEN or
auto speed advance mode. The auto speed advance
CLOSE status of the valves.
mode has no control features to reduce the speed or stop
T h e fuel oil service pump operation can be
either pump. Reducing speed or stopping either pump is
controlled at the PCC in either the auto speed advance
a manual operation, regardless of the position of the
or manual mode. The operator selects low speed, high
mode switch.
speed, or stop by depressing the corresponding switch
in the manual mode. The pump will advance from low
The PCC propulsion control panel provides a mimic
speed to high speed if the pressure is below 40 psig and
layout of the MRG with 29 indicators representing the
in the auto advance mode. The pump must be manually
reset to low speed.
the bearing temperature alarms are set at 20 degrees
above maximum frill power builder trial data for the
The following gas turbine fuel oil control and
individual ship.
monitoring functions are available at the PCC:
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