GAS TURBINE MODULE (GTM)--The
FUEL OIL SYSTEM--This system provides
GTM consists of the main propulsion gas turbine
a continuous supply of clean fuel to the GTMs.
unit, including the GTE, base, enclosure, shock
mounting system, fire detection and extinguishing
FUEL TRANSFER AND OIL BALLAST
system, and the enclosure environmental control
CONTROL PANEL (FTOBCP)--This panel is
components.
located in CCS and is used to monitor the ship's
fuel tanks (FFG-7 class ships).
GAUGE PRESSURE--Pressure that is
measured using atmospheric pressure for zero
FUEL SYSTEM CONTROL CONSOLE
reference.
(FSCC)-- The FSCC is located in CCS and is the
central station for monitoring and control of the
fuel fill and transfer system on the DD and CG
GENERATOR BREAKER (GB)--The GB is
class ships.
used to connect a generator to its main
switchboard.
FULL POWER CONFIGURATION--The
condition in which both engines (GTEs) of a set
GOVERNOR DROOP MODE--Droop mode
are engaged and driving the reduction gear and
is normally used only for paralleling with shore
propeller shaft.
power. Since shore power is an infinite bus (fixed
frequency), droop mode is necessary to control
FUNCTION--To perform the normal or
the load carried by the generator. If a generator
characteristic action of anything, or special duty
is paralleled with shore power, and an attempt is
or performance required of a person or thing in
made to operate it in isochronous mode instead
the course of work.
of droop mode, the generator governor speed
reference can never be satisfied because the
FUNCTIONAL COMPONENT SYSTEM--
generator frequency is being held constant
A system of standardized units of carefully
by the infinite bus. If the generator governor
balanced combinations of material, equipment,
speed reference is above the shore power
and/or personnel. Each unit is designed to per-
frequency, the load carried by the generator
form a specific task at an advanced base.
will increase beyond capacity (overload) in
an effort to raise the shore power frequency.
GALVANOMETER-- An instrument for
If the speed reference is below the shore power
measuring a small electric current, or for
frequency, the load will decrease and reverse
detecting its presence or direction by the
(reverse power) in an effort to lower the shore
movements of a magnetic needle or of a coil in
power frequency. The resulting overload or
a magnetic field.
reverse power will trip the GB.
GAS GENERATOR (CC)--The gas-
GOVERNOR ISOCHRONOUS MODE--
producing section of any GTE. It usually has a
This mode is normally used for generator
compressor, a combustor, a high-pressure turbine,
operation. This mode provides a constant
an accessory drive system, and controls and
frequency for all load conditions. When operating
accessories.
two (or more) generators in parallel, isochronous
mode also provides equal load sharing between
GAS GENERATOR SPEED (Ngg)--The
units.
speed sensed by a magnetic pickup on the transfer
gearbox of the GTE.
HAZARD ALARM--This type of alarm is
used in the fuel control system and DCC. It
GAS TURBINE ENGINE (GTE)--A gas
shows that a parameter has exceeded preset safe
turbine engine consists of a compressor, a
limits.
combustor, a turbine, and an accessory drive
system. Many variations of GTEs exist.
HEAD TANK--The tank located higher than
other system components to provide a positive
GAS TURBINE GENERATOR SET
pressure to a system by gravity when the system
(GTGS)--The GTGS has a GTE, a reduction
is secured.
gearbox, and a generator.
AI-6
