to maintain these controllers. On some ships, however,
(high), or stop. The operation of the lube oil pumps also
the EMs will maintain the controllers. Proper preventive
can be placed in manual or automatic control from the
maintenance reduces the chance of failure of the lube
consoles.
oil pump controllers. Routine PMS includes keeping the
COMPONENTS
insulation resistance of the control and power circuits
In the following sections, we will discuss only the
high and making sure the electrical connections are
parts that are of primary concern to the GSE. This
tight. Any problems found in the controllers must be
discussion will include the maintenance and repair of
corrected immediately. Make sure you follow the proper
electrical safety precautions during the maintenance of
the lube oil service pump motors and the lube oil pump
these controllers.
controllers. Refer to chapter 5 of this TRAMAN for a
detailed discussion of the maintenance and
TROUBLESHOOTING.-- While performing PMS
troubleshooting procedures associated with motors and
on the lube oil pump controllers, you will sometimes
controllers.
find it necessary to troubleshoot the controllers. A fault
in the controller is usually caused by short circuits, open
Lube Oil Service Pump Motors
circuits, or grounds. Since the controller is an electro-
The motors for the main lubricating oil system are
mechanical device, it will sometimes give in to mechan-
3-phase, 60-Hz, 440-volt ac, fan-cooled motors. These
ical failures. You, the GSE, must be able to locate and
two-speed motors are designed for constant-speed,
repair these types of faults to the controller. Refer to
continuous-duty operation. Each lube oil pump motor
chapter 5 of this TRAMAN for additional information
circuitry is contained in its associated electric controller.
on troubleshooting the lube oil pump controllers.
M A I N T E N A N C E . -- The main lube oil service
pump motors are maintained the same as any other
WASTE HEAT RECOVERY SYSTEM
motor. This includes keeping the insulation clean and
dry, the electrical connections tight, and the motor in
Steam for ship's services on DD-963, DDG-993,
good mechanical condition. Usually, this is
and CG-47 class ships is generated by three waste heat
accomplished through PMS. Be sure to keep the interior
and exterior of the motor clean and free of dirt. Dirt and
from the gas turbine generator sets (GTGS) as the heat
debris are the major cause of motor failure.
s o u r c e . The boilers are the forced-recirculation,
water-tube type. The major parts of the ship's waste heat
TROUBLESHOOTING.-- When a malfunction
recovery system consist of the WHB, boiler control
occurs to the lube oil pumps, you, the GSE, must
panel, recirculating pump, feed pump, control
troubleshoot the lube oil pump motors. A fault in the
condenser, separator, and feedwater tank. As a GSE, you
motor is usually caused by short circuits, open circuits,
will mainly be concerned with the maintenance of the
or grounds. You must locate and repair these faults to
boiler control panel and the feedwater and recirculating
restore the lube oil system to its maximum operating
pump motors. The maintenance and troubleshooting
condition. Refer to chapter 5 for additional information
procedures used for the feedwater and recirculating
on troubleshooting the lube oil pump motors.
pump motors are the same as those discussed earlier in
Lube Oil Service Pump Controllers
this chapter. In the following paragraphs, we will
describe only the maintenance and troubleshooting
The controllers for the lube oil system are located
procedures used for the boiler control panel.
in the engine rooms on gas turbine-powered ships. The
controllers are normally the dripproof, ac magnetic type.
OPERATION
They operate from a 3-phase, 60-Hz, 440-volt ac source.
The selector switches on the boiler control panel,
The lube oil pump controllers provide local control of
when in the AUTO mode, will start the WHB when the
the lube oil pumps. The pumps can be stopped and
gas turbine starts. With the feedwater pump selector
started from these controllers. The controllers are
switch in AUTO, the feedwater pump must reach a
usually equipped with reset push buttons to restore
discharge pressure of 100 psig 10 seconds after the
motor overloads.
WHB has received an auto start command. If not, the
M A I N T E N A N C E . The main lube oil service
feedwater pump will be shut down. During normal
pump controllers are maintained in the same manner as
operation, if the feedwater pump discharge falls below
any other electrical controller. On most gas
100 psig, the feedwater pump will immediately be
turbine-powered ships, it is the responsibility of the GSE
stopped. The selector switch also can be placed in the
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