(NOTE: Refer to page AI-4 for a glossary of chemicals
used in water treatment.)
ABFCAdvanced Base Functional Components.
AERATORDevice for removing certain dissolved
gases during water treatment.
decomposition that occurs in the presence of
AFTERCOOLERA device which cools the final
discharge from a compressor.
decomposition occurring in the absence of free
ANGLEA figure formed by two lines or planes
extending from, or diverging at, the same point.
ANGLE VALVEA stop valve that is actually a
combination valve and elbow since its outlet
branch is at right angles to its inlet branch.
AQUIFERA geological water-bearing formation
that can provide water for wells.
ARCHITECTURAL PLANShow design and
composition of a structure, including floor
plans, building sections, and elevations.
BACK-PRESSURE VALVEA valve similar in
design to a low-pressure valve that is capable of
opening independently of the pressure, thereby
giving free exhaust.
BACTERIALiving organisms, microscopic in size,
which consist of a single cell. Most bacteria use
organic matter for their food and produce waste
products as a result of their life processes.
BILL OF MATERIALA list of all materials
required to complete an installation based on
takeoffs and estimates.
BLUEPRINTA photographic print consisting of
white lines on a blue background. It is used for
copying architects plans, drawings, and so
BUSHINGA plumbing fitting used to reduce from
one size of pipe to another size of pipe.
BUTTERFLY VALVEA two-position valve with a
vertical or horizontal disk.
BTUBritish thermal unit, a measurement of heat.
granular white powder used to disinfect water.
CAPA plumbing fitting used to close off a length of
CAULKING IRONA plumbing tool used to
compact or caulk lead wool or poured lead into
a cast-iron pipe joint.
CBMUConstruction Battalion Maintenance Unit.
CBRChemical, Biological, and Radiological.
CBUConstruction Battalion Unit.
CECCivil Engineer Corps.
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. Is used with metric
units of measure. Equal to the international
thermometric scale of Celsius.
CHECK VALVEAn automatic nonreturn 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.
CHLORINATION The disinfection of a substance
or container by a chlorine chemical or gas.
CHLORINEA natural chemical element (Cl). A
powerful disinfectant, used extensively in
water treatment. As a gas, its color is greenish
yellow, and it is 2 1/2 times heavier than air. As
a liquid, its color is amber, and it is about 1 1/2
times heavier than water. It is an oxidizer and is
toxic to all organisms and corrosive (in the
presence of water) to most metals.
CIVIL PLANSThe essential data for layout,
location, and site for a construction project,
including boundaries, elevations, roads,
utilities, structures, and references of both
existing and finished construction.