BLOW-IN DOORS--Doors located on the
AUTOMATIC BUS TRANSFER (ABT)--
high hat assembly designed to open by solenoid-
Normal and alternate power sources are provided
operated latch mechanisms if the inlet airflow
to vital loads. These power sources are supplied
becomes too restricted for normal engine
from separate switchboards through separated
operation.
cable runs. Upon loss of the normal power supply,
the ABT automatically disconnects this source and
switches the load to the alternate source.
BOILER RECORD SHEET--A NAVSEA
form maintained for each boiler, which serves as
a monthly summary of operation.
AUTOMATIC PARALLELING DEVICE
(APD)--The APD automatically parallels any
two generators when initiated by the EPCC.
BORESCOPE-- A small periscope (instru-
ment) used to visually inspect internal engine
components.
AUXILIARY CONTROL CONSOLE
(ACC)-- The console in CCS used to monitor the
FFG-7 class auxiliary systems.
BOYLE'S LAW--If the temperature of a
gas is kept constant, then the volume of
the gas will be inversely proportional to the
BABBITT--A white alloy of tin, lead,
pressure.
copper, and antimony that is used for lining
BRITISH THERMAL UNIT (BTU)--The
amount of heat that will raise the temperature of
BACK PRESSURE--A pressure exerted
1 pound of water 1 Fahrenheit (from 62F to
contrary to the pressure producing the main flow
on the discharge/exhaust side of an engine or
63F).
pump.
BUS-- An uninsulated power conductor (a bar
or wire) usually found in a switchboard.
BAFFLE-- A plate, wall, or screen used to
deflect, check, or otherwise regulate the flow of
a gas, liquid, sound waves, and so forth.
BUS TIE BREAKER (BTB)--A device used
to connect one main switchboard to another main
switchboard.
BATTERY--A device for converting chemical
energy into electrical energy.
CALIBRATION--(1) The operation of
making an adjustment or marking a scale
BATTERY CAPACITY--The amount of
so that the readings of an instrument conform
energy available from a battery. Battery capacity
to an accepted standard. (2) The checking of
is expressed in ampere-hours.
readings by comparison with an accepted
standard.
BELL LOG--A printed record of changes in
the ship's operative conditions, such as speed or
point of control.
CALORIE--The amount of heat required
at a pressure of 1 atmosphere to raise the
temperature of 1 gram of water 1 Centi-
BLEED AIR--Air bled off the compressor
grade.
stages of the GTEs. See BLEED AIR SYSTEM.
CAPILLARY TUBE--A slender, thin-walled,
BLEED AIR SYSTEM (BAS)--Takes air
small-bored tube used with remote-reading
extracted from the compressor stage of a GTE and
indicators.
uses it for anti-icing, prairie air, masker air, and
LP gas turbine starting for off-line GTEs.
CASUALTY-- An event or series of events
in progress during which equipment damage
BLOCK DIAGRAM--A diagram in which
and/or personnel injury has already occurred.
the major components of an equipment or a
The nature and speed of these events are such that
system are represented by squares, rectangles, or
proper and correct procedural steps will only serve
other geometric figures. The normal order of
to limit equipment damage and/or personnel
progression of signal flow, current flow, or
injury.
component relationship is represented by lines.
AI-2
