wearing rubber gloves (use a rubber mat or boots as
If steam pressure is lost in one engine room during
additional insulation) to determine the source of trouble
split plant operation and the tactical situation permits,
and effect repairs.
take way off the ship by backing the other engine.
Determine the nature of the casualty causing the loss of
If an electrical fire occurs in a switchboard with a
steam. If a loss of steam pressure in the engine room
generator on the line, trip the appropriate circuit
will not cause a loss of steam to the other plant, open the
breakers (fig. 14-6). The MM should actuate the
auxiliary and the main steam cross-connections
overspeed trip on the generator and notify the EOOW.
immediately. If the damage caused a loss of steam to
The EOOW then notifies the OOD and the engineering
the other plant, isolate the damage and then open the
auxiliary and the main steam cross-connections as soon
as possible. Stop and lock the affected shaft as soon as
The EM should secure the voltage regulator, trip the
steam is available.
bus-tie circuit breaker, and open the feedback circuit
breaker. If the fire is in the forward switchboard, the
ELECTRIC PLANT CASUALTIES
EM should notify the after switchboard watch to open
the after bus tie circuit breaker and should then use a
Knowing the maximum operating limits of the
C02 fire extinguisher on the fire. The damaged section
electric plant is of prime importance during casualty
of the switchboard should not be reenergize until
operation. You must know the maximum allowable
repairs have been made.
bearing temperatures, generator winding temperatures,
maximum generator loads, and so forth.
If an electrical fire occurs in a generator, the
generator should be secured immediately. If the fire
Supplying vital power during casualty operation
occurs while operating split plant, the EM should trip
may require that generators be operated under overload
the generator circuit breaker for the affected generator
conditions. Assuming that the prime mover can handle
and close the bus tie. Use a C02 fire extinguisher on the
the overload, the temperature of the generator windings
fire. If a generator fire occurs during operation with a
is the determining factor during sustained overloads. A
single generator, the switchboard should be stripped of
portable blower may be used on open-type machines to
all nonvital circuits after opening the generator breaker.
keep the winding temperature within safe limits.
The vital circuits should then be supplied from the
Operational electric plant casualties that might
emergent y diesel generator.
occur include loss of generator, electrical fires, loss of
lube oil, and overloaded generator.
Loss of Lube Oil
The proper procedure in the event of an electrical
Upon failure of generator lube oil pressure, take the
fire is as follows:
Do not stand directly in front of the panel that is on
fire. Keep low and to one side while using the CO2
After the turbine has completely stopped,
extinguisher. Once the fire is out and the danger of
investigate and correct the casualty.
reflash has passed, the electrician should open the panel