APPENDIX I
GLOSSARY
AUTOMATIC COMBUSTION CONTROL (ACC)
SYSTEM–A system that automatically controls the
fuel and air mixture in a boiler.
AUXILIARY MACHINERY–Any system or unit of
machinery that supports the main propulsion units
or helps support the ship and the crew; for example,
pump, evaporator, steering engine, air-conditioning
and refrigeration equipment, laundry and galley
equipment, and deck winch.
BACK PRESSURE–The pressure exerted on the
exhaust side of a pump or engine.
BALLASTING–The process of filling empty tanks
with seawater to protect the ship from underwater
damage and to increase its stability See
DEBALLAST-ING.
BLOW TUBES–Use of steam to remove soot and
carbon from the tubes of steaming boilers.
BLUEPRINT–Reproduced copy of a drawing (usually
having white lines on a blue background).
BOTTOM DEAD CENTER (BCD)–The position of a
reciprocating piston at its lowest point of travel.
BOILER–A strong metal tank or vessel, composed of
tubes, drums, and headers, in which water is heated.
BOILER CENTRAL CONTROL STATION–A
centrally located station for directing the control of
all boilers in the fireroom.
BOILER DESIGN PRESSURE–Pressure specified
by the manufacturer, usually about 103 percent of
normal steam drum operating pressure.
BOILER INTERNAL FITTINGS–All parts inside the
boiler that control the flow of steam and water.
BOILER OPERATING PRESSURE–The pressure at
which a boiler is maintained while in service.
BOILER OPERATING STATION–A location from
which a boiler is operated.
BOILER RECORD SHEET–A NAVSHIPS form
maintained for each boiler, which serves as a
monthly summary of operation.
BOILER REFRACTORIES–Materials used in the
boiler furnace to protect the boiler from heat.
BOILER ROOM–A compartment containing boilers
but not containing a station for operating or firing
the boilers Refers specifically to bulkhead-enclosed
boiler installations.
BOILER TUBE CLEANER–A cylindrical brush that
is used to clean the insides of boiler tubes.
BOILER WATER–The water actually contained in the
boiler.
BOTTOM DEAD CENTER (BCD)–The position of a
reciprocating piston at its lowest point of travel.
BOURDON TUBE–A thin-walled tube bent into the
shape of a letter C, which tends to straighten out
—
when pressure is exerted. As the tube straightens, it
moves a pointer around a gauge dial.
BRAZING–A method of joining two metals at high
temperature with a molten alloy.
BRINE–A highly concentrated solution of salt in water,
normally associated with the overboard discharge
of distilling plants.
BRITTLENESS–A property of a material that causes
it to break or snap suddenly with little or no prior
sign of deformation.
BULL GEAR–The largest gear in a reduction gear
train The main gear, as in a geared turbine drive.
BURNERMAN–Person in the fireroom who tends the
burners in the boilers.
BUSHING–A renewable lining for a hole through
which a moving part passes.
BYPASS–To divert the flow of gas or liquidAlso, the
line that diverts the flow.
CALIBRATION–The comparison of any measuring
instrument with a set standard of a greater accuracy.
CANTILEVER–A projecting arm or beam supported
only at one end.
CAPILLARY TUBE–A slender, thin-walled,
small-bored tube used with remote-reading
indicators.
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