ABSOLUTE ZERO The point where all molecular
motion ceases, -460°F.
AC Alternating current.
AEROBIC DECOMPOSITION Bacterial
decomposition that occurs in the presence of oxygen.
AFTERCOOLER Device which cools the final
discharge from a compressor.
ANGLE VALVE A stop valve that is actually a
combination valve and elbow since its outlet branch
is at right angles to its inlet branch.
ASME American Society of Mechanical Engineers.
BILL OF MATERIAL A list of all materials required
to complete an installation based on takeoffs and
BOILER An enclosed vessel that converts water to
steam of proper temperature and pressure for an
BOILER SETTING The structure that encloses a
boiler and forms a furnace.
BREECHING Connects a boiler to the stack.
BUSHING A plumbing fitting used to reduce the pipe
from one size to another size.
BUTTERFLY VALVE A two-position valve with a
vertical or horizontal disk.
CAP A plumbing fitting used to close off a length of
CATHODIC PROTECTION The use of material
and liquid to cause electricity to flow to avoid
CBMU Construction Battalion Maintenance Unit.
CBR Chemical, Biological, and Radiological.
CBU Construction Battalion Unit.
CEC Civil Engineer Corps.
CENTRIFUGAL FORCE The force that impels a
substance to move outward from the center of
CENTIGRADE A thermometric scale in which 0
degrees represents the freezing point and 100
degrees represents the boiling point of water at a
pressure of 1 atmosphere. Generally used with metric
units of measure. Equal to the international
thermometric scale of Celsius.
CHECK VALVE An automatic non-return valve or a
valve which permits a fluid to pass in one direction
but automatically closes if the fluid begins to pass in
the opposite direction.
CLARIFICATION OF WATER The removal of
suspended materials to produce a clear, clean liquid.
COLIFORM The coliform groups of organisms are a
bacterial indicator of contamination. This group has
as one of its primary habitats, the intestinal tract of
human beings. Coliforms also may be found in the
intestinal tract of warm-blooded animals and in
plants, soil, air, and the aquatic environment.
COMSECONDNCB Commander, Second Naval
COMTHIRDNCB Commander, Third Naval
COMPRESSOR Pump of a refrigerating mechanism
which draws a low pressure on the cooling side of the
refrigerant cycle and squeezes or compresses the gas
into the high pressure or condensing side of the cycle.
CONDENSATION The process of changing a vapor
to a liquid.
CONDENSER Component in a refrigeration system
that removes and dissipates heat from a compressed
CONDUCTION The transmitting of heat from one
substance or part to another substance or part that are
in direct contact with each other.
CONVECTION The transfer of heat by means of a
medium, such as water, air, and steam.
COUPLING A plumbing fitting used to join two
lengths of pipe in a straight run.
DEGREE OF TEMPERATURE Measurement of