Page 309 - Root Cause Failure Analysis

Glossary 297
hydraulic hammer An instantaneous shock load created by rapidly
closing a valve. A radical surge of back pressure
is generated that can tear a pump or other
equipment from its piping and foundation.
impeller Rotating member or rotor of a turbine, blower,
fan, axial or centrifugal pump, or mixing
apparatus that physically moves a fluid: also
known as a rotor,
incident Something that happens, an event.
incremental cost The difference between the costs of two
alternative procedures or operating conditions.
indices Indicators.
inductive The process of reasoning from particular facts to
a general conclusion.
inertia The property of an object by which it remains at
rest or in uniform motion in the same straight
line unless acted on by some external force.
inverter A device for converting direct current into
alternating current; it may be electromechanical
or electronic; also known as a DC-to-AC
converter.
involute tooth profile The profile most commonly used for gear teeth.
It does not provide as good a rolling action as
the cycloidal profile and, as a result, some
sliding between teeth occurs. It is less sensitive
to shaft alignment and gear spacing than the
cycloidal profile.

kinetic energy Energy associated with motion.
laminar Viscous streamline flow without turbulence.
lateral Of, at, on, or toward the side.
lift, dynamic The change in vertical distance that occurs when
a system is in operation.
lift, static The vertical distance present regardless of
whether a system is operating or not.
lift. suction See Suction lift.
lift, vertical The elevation change, measured from centerline
to centerline.