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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.
Magnetic pickup - a transducer used in vibration monitoring by sensing the
discontinuity in ferromagnetic material. The mechanical motion caused by the
discontinuity is converted into electrical signal in the form of an AC voltage.
Material traceability -
Maximum allowable operating speed -
Maximum allowable working pressure (MAWP) -
Mechanical seal -
Minimum continuous stable flow (MCSF) - Click on link for full article.
Minimum thermal flow - see thermal minimum flow.
Mixed flow impeller -
Mixed flow pump - pump in which the head is developed partly by centrifugal
force and partly by the lift of the vanes on the liquid; the liquid enters the
impeller axially at the hub and is discharged in both axial and radial direction.
Modeling laws - see Affinity Laws.
Moment of inertia - the sum of the products of the mass and the square of the
perpendicular distance to the axis of rotation of each particle in a body rotating
about its axis.
Momentum thrust - the thrust acting on a rotor caused by the change of
momentum of a liquid when the flow changes direction. It is typically determined
at the impeller inlet and is considered in calculating the axial thrust of a pump.
Multistage pump - pump designed with more than two impellers. Pump with two
impellers is also a multi-stage pump but is usually referred to as two-stage pump.
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