Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 23)

MAINTENANCE
GENERAL MAINTENANCE AND PERIODIC
INSPECTION
Operating conditions vary so widely that to
recommended one schedule of preventative
maintenance for all centrifugal pumps is not
possible. Yet, some sort of regular inspection must
be planned and followed. We suggest a
permanent record be kept of the periodic
inspections and maintenance performed on your
pump. This recognition of maintenance procedure
will keep your pump in good working conditions,
and prevent costly breakdowns.
One of the best rules to follow in the proper
maintenance of your centrifugal pump is to keep a
record of actual operating hours. Then, after a
predetermined period of operation has elapsed,
the pump should be given a thorough inspection.
The length of this operating period will vary with
different applications, and can only be determined
from experience. New equipment, however,
should be examined after a relatively short period
of operation. The next inspection period can be
lengthened somewhat. This system can be
followed until a maximum period of operation is
reached which should be considered the operating
schedule between inspections.
MAINTENANCE OF FLOOD DAMAGED PUMPS
WARNING: Unexpected Startup Hazard
Disconnect and lockout power before
servicing. Failure to follow these instructions could
result in serious personal injury or death, or
property damage.
WARNING: Electrical Shock Hazard
Electrical connections to be made by a
qualified electrician in accordance will all
applicable codes, ordinances, and good practices.
Failure to follow these instructions could result in
serious personal injury or death, or property
damage.
The servicing of centrifugal pumps after a flooded
condition is a comparatively simple matter under
normal conditions.
Bearings are a primary concern on pumping units.
First, dismantle the frame, clean and inspect the
bearings for any rusted or badly worn surfaces. If
bearings are free from rust and wear, reassemble
and relubricate them with one of the
recommended lubricants. Depending on the length
of time the pump has remained in the flooded
area, it is unlikely that bearing replacement is
necessary; however, in the event that rust or worn
surfaces appear, it may be necessary to replace
the bearings.
Next, inspect the stuffing box, and clean out any
foreign matter that might clog the box. Packing
that appears to be worn, or no longer regulates
leakage properly should be replaced. Mechanical
seals should be cleaned and thoroughly flushed.
Couplings should be dismantled and thoroughly
cleaned. Lubricate the coupling with one of the
coupling manufacturer’s recommended lubricants
where required.
LUBRICATION
Grease Lubrication of Bearings
Grease lubricated ball bearings are packed
with grease at the factory and ordinarily will
require no attention before starting, provided
the pump has been stored in a clean, dry
place prior to its first operation. The bearings
should be watched the first hour or so after
the pump has been started to see that they
are operating properly.
A lithium based NLGI-2 grade grease should
be used for lubricating bearings where the
ambient temperature is above -20°F. Grease
lubricated bearings are packed at the factory
with Shell Alvania No. 2. Other recommended
greases are Texaco Multifak No. 2 and
Mobilux No. 2 grease.
Greases made from animal or vegetable oils
are not recommended due to the danger of
deterioration and forming of acid. Do not use
graphite. Use of an ISO VG 100 mineral base
oil with rust and oxidation inhabitors is
recommended.
In greasing anti-friction bearings, the use of
high pressure equipment is not only
unnecessary, but is actually undesirable
unless used with great care. High pressure
may damage the bearings or seals, cause
unnecessary loss of grease, create a danger
of overheating due to overgreasing, and
produce unsightly conditions around the
bearing. Excess grease is the most common
cause of overheating. Adequate lubrication is
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