RADIATION, HEATHeat emitted in the form of heat
REACH RODSA length of pipe used as an extension
on valve stems.
REACTION TURBINEA turbine in which the major
part of the driving force is received from the reactive
force of steam as it leaves the bladingSee IMPULSE
REDUCEAny coupling or fitting that connects a
large opening to a smaller pipe or hose.
REDUCING VALVESAutomatic valves that provide
a steady pressure lower than the supply pressure.
REDUCTION GEARA set of gears that transmit the
rotation of one shaft to another at a slower speed.
REEFERA refrigerated compartmental authorized
abbreviation for refrigerator.
REFRACTORYVarious types of heat-resistant,
insulating material used to line the insides of boiler
REFRIGERANT 12 (R-12)A nonpoisonous gas used
in air-conditioning and refrigeration systems.
REGULATOR (GAS)An instrument that controls the
flow of gases from compressed gas cylinders.
REMOTE OPERATING GEARFlexible cables
attached to valve wheels so that the valves can be
operated from another compartment.
RISERA vertical pipe leading off a large horizontal
pipe; for example, a fire main riser.
ROTARY SWITCHAn electrical switch that closes
or opens the circuit by a rotating motion.
ROTORThe rotating part of a turbine, pump, electric
motor, or generator.
SAEAbbreviation for the Society of Automotive
SAFETY VALVEAn automatic, quick opening and
closing valve that has a reset pressure lower than the
SALINITYRelative salt content of water.
SALINOMETERA hydrometer that measures the
concentration of salt in a solution (brine density).
SATURATION PRESSUREThe pressure
corresponding to the saturation temperature.
SATURATION TEMPERATUREThe temperature
at which a liquid boils under a given pressureFor
any given saturation temperature, there is a
corresponding saturation pressure.
SCALEAn undesirable deposit, mostly calcium
sulfate, that forms in the tubes of boilers and
SECURETo make fast or safe-the order given on
completion of a drill or exercise. The procedure
followed when any piece of equipment is to be shut
SENTINEL VALVESSmall relief valves used
primarily as a warning device.
propeller shafts pass through.
SHAFT ALLEYThe compartment of a ship that
SKETCHA rough drawing indicating
of an object.
SLIDING FEETA mounting for turbines and boilers
that allows for expansion and contraction.
SLUDGEThe sediment left in fuel oil tanks, lube oil
sumps, and boiler water drums.
SOLID COUPLINGA device that joins two shafts
SOOT BLOWERA soot removal device that uses a
steam jet to clean the fire sides of a boiler.
SPECIFIC HEATThe amount of heat required to
raise the temperature of 1 pound of a substance
1$FAll substances are compared to water that has a
specific heat of 1 Btu/lb/°F.
SPEED-LIMITING GOVERNORA device that
limits the rotational speed of a prime mover.
SPEED-REGULATING GOVERNORA device that
maintains a constant speed on a piece of machinery
that is operating under varying load conditions.
SPLIT PLANTA method of operating an electrical or
propulsion plant so that it is divided into two or more
separate and complete units.
SPRING BEARINGSBearings positioned at varying
intervals along a propulsion shaft to help keep it in
alignment and to support its weight.
STANDBY EQUIPMENTTwo identical auxiliaries
that perform one functionWhen one auxiliary is
running, the standby is connected so that it maybe
started if the first fails.
STATICA force exerted by reason of weight alone as
related to bodies at rest or in balance.