CARBON DIOXIDEA colorless, colorless gas used as
a fire-extinguishing agent and for inflating life rafts
and life jackets.
CARBON PACKINGPressed segments of graphite
used to prevent steam leakage around shafts.
CASUALTY POWER SYSTEMPortable cables that
are rigged to transmit power to vital equipment in
CENTRAL CONTROL STATION (CCS)The CCS
is the main operating station from which a majority
of the engineering plant machinery can be
controlled and monitored on modern naval ships.
CHECK VALVEA valve that permits the flow of a
liquid in one direction only.
CIRCUIT BREAKERAn electrical device that
provides circuit overload protection.
CLUTCHA form of coupling designed to connect or
disconnect a driving or driven member.
COLD IRONThe condition of an idle engineering
plant when all port services are received from an
external source such as shore or tender.
CONDENSATEWater produced in the cooling
system, of the steam cycle, from steam that has
returned from the turbine or from steam that has
returned from various heat exchangers.
CONDENSERA heat-transfer device in which steam
or vapor is condensed to water.
CONDUCTIONA method of heat transfer from one
body to another when the two bodies are in physical
CONSTANT PRESSURE GOVERNORA device
that maintains a constant pump discharge pressure
under varying loads.
C O N T R O L L A B L E R E V E R S I B L E - P I T CH
PROPELLER (CRPP)A propeller whose blade
pitch can be varied to control the amount of thrust
in both ahead and astern directions.
CONTROLLERA device used to stop, start, and
protect motors from overloads while the motors are
COOLERAny device that removes heat.
CORROSIONThe process of being eaten away
gradually by chemical action, such as rusting.
COUNTERSINKA cone-shaped tool used to enlarge
and bevel one end of a drilled hole.
CREEP-RESISTANT ALLOYA metal that resists
the slow plastic deformation that occurs at high
temperatures when the material is under constant
CROSS-CONNECTED PLANTA method of
operating two or more systems as one unit.
CURTIS STAGEA velocity-compounded impulse
turbine stage that has one pressure drop in the
nozzles and two velocity drops in the blading.
DEAERATING FEED TANK (DFT or DA tank)A
device used in the waste-heat boiler system to
remove dissolved oxygen and noncondensable
gases from the feedwater.
DEBALLASTINGThe process by which seawater is
emptied from tanks to protect the ship from
underwater damage and to increase its stabilitySee
DEGREE OF SUPERHEATThe amount by which
the temperature of steam exceeds the saturation
DIESEL FUEL MARINEA fuel oil.
DIRECT CURRENT (dc)current that moves in one
DIRECT DRIVEOne in which the drive mechanism
is coupled directly to the driven member.
DISTILLATEWater produced in distilling plants.
DISTILLING PLANTA system that converts
seawater into fresh water commonly called
DRAWINGAn illustrated plan that shows fabrication
and assembly details.
DRUM, STEAMThe large tank at the top of the boiler
in which the steam collects.
DRUM, WATERA tank at the bottom of a boiler.
DUCTILITYThe property possessed by metals that
allows them to be drawn or stretched.
ECONOMIZERA heat-transfer device on a boiler
that uses the gases of combustion to preheat the
EDUCTORA jet pump that uses water to empty
EFFICIENCYThe ratio of the output to the input.
ELASTICITYThe ability of a material to return to its
original size and shape.