DEHYDRATOR Device used to remove moisture
JOINING All the procedures used to connect pipes
from a refrigerant system.
DEW POINT Temperature at which vapor (at 100
percent humidity) begins to condense and deposit as
DIATOMACEOUS EARTH A porous mineral
powder, used as a filtering medium for the removal of
ELBOW A plumbing fitting used to change the
direction of a length of pipe at 90° and 45° angles.
EVAPORATOR Component of a refrigeration
system that permits the absorption of heat from a
desired medium or space.
EVAPORATION A process of converting a liquid,
by heat, into a vapor or gas.
FILTER-DRIER Device for removing small foreign
particles and moisture from refrigerant fluid.
FITTINGS Devices which when placed in a pipe
system make branch connections or changes in a
direction of a line.
GATE VALVE A sluice with two inclined seats
between which the valve wedges down in closing.
The passage through the valve is in an uninterrupted
line, and when the valve is opened, the sluice is
drawn up into a dome or recess, leaving an
unobstructed passage the full diameter of the pipe.
GLOBE VALVE A valve with a round, ball-like shell
that is used for regulating or controlling the flow of
gases or steam.
GPD Gallons per day.
GPH Gallons per hour.
GPM Gallons per minute.
HEAT The energy that is measured in British thermal
HERMETICALLY SEALED Caused to be airtight.
HUMIDITY The amount of water vapor in a given
volume of air.
HYDROLOGIC CYCLE Process by which water is
circulated from ocean to atmosphere to earths
ID Inside diameter.
INFLUENT Water flow into a sewage or water
treatment plant or equipment.
LATENT HEAT Amount of heat required to change
the state of a substance without a measurable change
MATERIAL TAKEOFF The estimate of materials
required for a job based on plans and specifications.
METERING DEVICE Valve or device used to
regulate amount and state of refrigerant as it passes
through the system.
NAVFAC Naval Facilities Engineering Command.
NCR Naval Construction Regiment.
NCTC Naval Construction Training Center.
NMCB Naval Mobile Construction Battalion.
OD Outside diameter.
PACKING Materials used to seal moving machinery
joints against leakage.
P H A value used to measure the acidity or alkalinity
(basic) of a substance. A pH scale is from 0 to 14,
with 7.0 as neutral. Below 7.0 on the scale is acid, and
above 7.0 on the scale is alkaline or basic. Used in
water treatment and purification.
PLUG A plumbing fitting used to close off a fitting or
a length of pipe by screwing into the fitting or pipe.
PPM Parts per million.
PSI Pounds per square inch.
PSIG Pounds per square inch gauge.
PUMP A mechanical device which applies a force to
move any substance that flows or can be made to
RADIATION The transfer of heat through space by
RECEIVER Device in a refrigeration system to store
refrigerant used by the system.
REDUCING VALVE A spring-loaded or
lever-loaded valve similar to a safety valve, designed
to maintain a lower end constant pressure beyond the
RELATIVE HUMIDITY The percentage of water
vapor in the air when compared to the amount it does
hold as to the amount it could hold.