STERN TUBE--(1) The bearing supporting
SHIP'S SERVICE DIESEL GENERATOR
the propeller shaft where it emerges from the ship.
(SSDG)--The SSDG is the main source of elec-
(2) A watertight enclosure for the propeller shaft.
trical power for a ship. It uses a diesel engine as
STERN TUBE FLUSHING WATER--Water
SHIP'S SERVICE GAS TURBINE GEN-
circulated through the stern tube from inboard
ERATOR (SSGTG)--The SSGTG is the main
to prevent accumulation of debris in the stern tube
source of electrical power for a ship. It uses a gas
while the ship is at rest or backing down.
turbine engine as the prime mover for the
STRAIN--The deformation of a material
body under the action of applied forces (stress).
tion between two points of different potential in
STRIPPING SYSTEM--A system provided
to strip all petroleum tanks of water and sediment.
SHUTTLE VALVE--A valve that is used to
STUFFING BOX--(1) A chamber and closure
direct fluid automatically from either the normal
with manual adjustment for a sealing device. (2)
source or an alternate source to the actuator.
A device to prevent fluid leakage between a
moving and a fixed part in a steam engineering
SIGNAL CONDITIONING ENCLOSURE
plant. (3) A fitting designed to permit the free
(S/CE)-- A part of the PAMISE that provides the
passage or revolution of a rod or a pipe while
major input interface between the propulsion
controlling or preventing the passage by it of
plant machinery and the ECSS control consoles.
water, steam, and so forth.
The S/CE accepts inputs from the plant
machinery and outputs normalized signals to the
ECSS control consoles. It also has alarm detec-
STUFFING TUBE--A packed tube that
makes a watertight fitting for a cable or small pipe
located in each main engine room and one is part
passing through a bulkhead.
of the CISE (located in CCS) on a DD or CG class
SUMMARY ALARM/FAULT--An indica-
tor at a console that indicates to an operator that
SOLID STATE--A class of electronics com-
one of several abnormal conditions has occurred
ponents, such as transistors, diodes, integrated
on a certain piece of equipment.
circuits, silicon controlled rectifiers, and so forth.
SPECIFIC GRAVITY--The ratio of the
CLUTCH--The SSS clutch is a fully automatic,
weight of a given volume of any substance to the
freewheel device that transmits power through
weight of an equal volume of distilled water. Since
the distilled water weighs approximately 62.4
pounds per cubic foot, any substance which
SYNCHRONOUS-- Happening at the same
weighs less than this has a specific gravity of less
than one and will float on water. Any substance
of greater weight per cubic foot has a specific
SYSTEM-- A grouping of components or
gravity of more than one and will sink. Specific
equipment joined to serve a common purpose.
gravity of gases is based in a like manner on the
weight of air.
SYSTEM INTERRELATION--Specific in-
dividual operations in one system affecting the
SPECIFIC HEAT--The amount of heat
operation in another system.
required to raise the temperature of 1 pound of
a substance 1°F. All substances are compared to
water, which has a specific heat of 1 BTU/lb/ °F.
for converting rotational speed into an electrical
quantity or signal.
SPLIT PLANT CONFIGURATION
(MODE)-- The condition in which only one
TAIL SHAFT--The aft section of the shaft
engine of a set is driving the reduction gear/pro-
that receives the propeller.