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Glossary E
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The following definitions are intended to give basic understanding of the terms
commonly used in the pump industry. Some industry standards, or customer
specifications, may have specific meaning of certain terms that may be different
from their common usage - in such case the terms should be interpreted in the
context of the standards, or specifications, being referred to.
pipe reducer, or an eccentric pump suction nozzle

Eccentricity (shaft) - The variation of a shaft surface at its outer diameter (OD)
when referenced to its true geometric centerline; a measure of a shaft's out-of-
roundness.

Eddy current - the electrical current that is generated in a conductive material
when such material intercepts the electromagnetic field, example, in a proximity
probe.

Efficiency - the ratio of output horsepower over input horsepower of a
machinery.

Effluent -

Elasticity - the property of a material that allows it to change its shape in direct
response to an applied force, and its ability to restore its original shape when
the force is removed; the state of being elastic or flexible.

Elastomer - an elastic material, or substance, either occurring naturally, or
synthetically produced.

Electrical runout - A source of error on the output signal of a proximity probe
(transducer) which repeats with each shaft revolution.

Enamel-lined - the characteristic of a wetted surface of being coated with
enamel, or some form of enameling material, to obtain a smoother surface finish
to help improve the pump efficiency, or a harder surface finish to make it more
resistant to abrasion.

End float

End-of-curve -

End-suction pump - pump whose suction nozzle is parallel and adjacent to the
non-drive end (NDE) of its shaft.  The liquid enters the suction nozzle and feeds
straight into the impeller eye. See top suction pump.

End-user - the ultimate equipment user, as opposed to a buyer, consultant, or
contractor who represents or acts in behalf of the ultimate user.

Enthalpy – the thermodynamic property of a saturated liquid that defines its
internal energy and the product of its pressure and volute. The change in
enthalpy is used to evaluate the rise in temperature of the pumped liquid and
the loss in pump efficiency due to the “compressibility” of the liquid. See entropy.

Entrance suction loss - of, or pertaining to, the hydraulic losses at the suction
nozzle up to the entrance of the (first stage) impeller of a pump. The entrance
suction losses affect the NPSHR. (Also referred to as suction entrance loss.)

Entropy - the thermodynamic property of a saturated liquid that defines the
amount of energy available for doing work. It is used to evaluate the rise in
temperature of the pumped liquid and the loss in pump efficiency due to the
“compressibility” of the liquid in a constant entropy environment. See enthalpy.

Erosion

Extrude honing -

Eye diameter

Eye area -

Eye peripheral speed -