Page 165 - Know and Understand Centrifugal Pumps

Know and Understand Centrifugal Pumps

3. The grout should be the correct type for the climate and application
temperature, speeds, and chemical nature.
w Its function is to absorb the vibrations generated by the motor
and pump.
w It should contain aggregate or epoxy.
w It should be applied strictly according to manufacturer’s
recomrnenda tions.
w It should be inspected for fractures, crumbling, and separation
every six months to identi@ conditions affecting the equipment
alignment.
4. Bases
w The driver or motor shaft should be level and parallel with the
base.
w Shims should be free of dirt and corrosion. They should be
replaced from time to time because they can become deformed
with time and weight.
w Bases should be inspected for corrosion and corrected if
necessary.
5. The Motor
w During the alignment procedure, follow your plant
lockout/tagout procedure to prevent accidents.
w Motor sleeve bearings require limiting the axial play.
w Study the coupling manufacturer’s instructions to assure the
proper spacing between the faces. The spacing is relative to the
motor size.
6. Dial indicators
w During the alignment it is important to note the direction of the
indicator movement. Beginning at 0.000 inches, a movement in
a clockwise direction is a positive reading. A counterclockwise
movement indicates a negative reading; see Figure 10-10.
w Rotating the shaft and dial 360°, the left lateral reading plus the
right lateral reading should equal the sum of the superior and
inferior readings.
w The indicator readings at the end of the rotation should be the
same as the readings at the beginning of the rotation.

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