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The Practical Pumping Handbook

12.7 Inspection checks

12.7.1 The back cover
The integral parts of the back cover and stuffing box (or seal chamber)
should be inspected for all pitting and wear damage as well as for cracks
or excessive corrosion or erosion damage. If localized wear, pitting or
grooving is greater than 0.125 inches deep, the cover should be
replaced or repaired. Any irregularities in the gasket seating surfaces
should be cleaned up.
If frequent seal failures are being experienced, a sound Reliability
Strategy would consider replacing a traditional stuffing box with a large
bore seal chamber as they have been proved to assist in the reliability of
mechanical seals in process pumps.

12.7.2 The frame adapter
This should be inspected for cracks and evidence of excessive corrosion
damage.

12.7.3 The bearing housing
The bearing housing should also be inspected for cracks and evidence
of excessive corrosion damage. The inside surfaces of the housing
should be cleared of all loose material such as rust, scale and other
debris. All lubrication passages should be cleared. In addition, the radial
fit on the bore of the radial bearing must also be checked to ensure that
it is still within the appropriate tolerances. This also applies to the bore
fit of the thrust bearing in the bearing cap.
A widely used upgrade is to replace the constant level oiler with a
bullseye type of oil sight glass. An oil mist system as discussed in
Chapter 7 would be considered a sound Reliability Strategy.

12.7.4 Lip seals
If a lip seal is removed, a sound Reliability Strategy will require that it,
and the flinger, be discarded and- when the pump is reassembled-
they be replaced with a suitable bearing isolator. If the isolator is already
in place, it can be stored for reinstallation when the pump is
reassembled.

12.7.5 The shaft
Both the shaft and the sleeve (if fitted) must be inspected for grooves
and pitting damage. All dimensions must be within tolerances,
especially the beating fits. The shaft must also have a run-out within the
usual tolerance of 0.002 inches.

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