I.D.
Inside diameter.
I.S.O.
International standards organization. Sets pump and seal standards
for the metric community.
Impeller
Attaches to the end of the shaft to impart energy to the fluid
being pumped. Available in open, semi- open and closed designs.
Impeller eye
The center of the impeller or the point where fluid enters the
impeller.
Impeller setting
Open impellers require a clearance between the volute or the
pump back plate depending upon design. This clearance must be
set when the pump is at operating temperature and must be reset
to compensate for wear. (0.015" to 0.020" or 0,04 mm
to 0,05 mm is typical)
Impeller shroud
the plates located on one or both sides of the impeller vanes.
Prevents solids from penetrating behind the vanes.
Impeller vane
Located between the eye and the discharge side of the impeller.
Directs the flow of the liquid to the outside diameter of the
impeller.
Implode
The opposite of explode. Bubbles implode in the higher pressure
areas of the pump making noise and causing damage to the metal
parts. This is normally called cavitation
Inclusion
A non metallic slug of material which has become entangled in
the metal during its manufacture. A severe problem in thin cross
section metal bellows manufacture.
Inducer
A small axial flow vane that attaches to the impeller of a centrifugal
pump to increase the N.P.S.H. available.
Induction motor
The most common type used in industry. Has a slippage of 2 to
5 percent compared to synchronous motors.
Inline pump
Mounted in the piping. No base plate or alignment required.
Internal recirculation
A loss of efficiency caused by liquid flowing through wear rings
or the impeller to volute clearances.
Intergranular corrosion
A corrosion of the grain boundaries in the body of the material.
Iteration
A technique used in impeller design. You repeat the action until
you get to the final result. Very difficult to do until the new
computer programs became available.