Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 25)

(1) Saybolt viscosity at 100°F.... 215 SSU-240 SSU
(2) Saybolt viscosity at 210°F......................49 SSU
(3) Viscosity index, minimum ..............................95
(4) API gravity ................................................28-33
(5) Pour point, maximum............................... +20°F
(6) Flash point, minimum............................... 400°F
(7) Additives ..................Rust & Oxidation inhibitors
(8) ISO viscosity..................................................46
NOTE: Oils from different suppliers should
not be mixed. Engine oils are not
recommended.
The oil should be a non-foaming, well refined,
good grade, straight cut, filtered mineral oil. It
must be free from water, sediment, resin,
soaps, acid and fillers of any kind.
In installations with moderate temperature
changes, low humidity, and a clean
atmosphere, the oil should be changed after
approximately 1000 hours of operation. The
oil should be inspected at this time to
determine the operating period before the
next oil change. Oil change periods may be
increased up to 2000-4000 hours based on
an 8000 hour year. Check the oil frequently
for moisture, dirt, or signs of “breakdown,”
especially during the first 1000 hours.
Do not over oil; this causes the bearings to
run hot. The maximum desirable bearing
housing operating temperature for all ball
bearings is 180°F. Should the temperature of
the bearing frame exceed 180°F (measured
by thermometer) shut down pump to
determine the cause.
Coupling Lubrication
Flexible, rubber element type couplings
(Wood’s Sure-Flex or Falk Wrap Flex
coupling for instance) provide smooth
transmission of power. There is no rubbing
action of metal against rubber to cause wear.
Couplings are not affected by abrasives, dirt,
or moisture. This eliminates the need for
lubrication or maintenance, and provides
clean and quiet performance.
If other type of couplings are used, follow
maintenance instructions of coupling
manufacturer.
SEAL INFORMATION
Packing (Non-Asbestos)
On packed pumps the packing is installed
prior to shipment. All packings used are the
highest grade material. Before pump is put
into operation check the condition of packing.
If pump is installed within sixty (60) days after
shipment the packing will be in good
condition with a sufficient supply of
lubrication. If pump is stored for a longer
period it may be necessary to repack the
stuffing box. In all cases, however, we
recommend an inspection of the packing
before pump is started.
The standard 8100 series pump packing is
made from braided acrylic yarn impregnated
with graphite.
A soft, well-lubricated packing reduces
stuffing box resistance and prevents
excessive wear on the shaft or shaft sleeve.
Many brands of packing on the market have
the desired qualities. Standard packing is
John Crane Style 1340, or equal.
When a pump with fiber packing is first
started it is advisable to have the packing
slightly loose without causing an air leak. As
the pump runs in, gradually tighten the gland
bolts evenly. The gland should never be
drawn to the point where packing is
compressed too tightly and no leakage
occurs. This will cause the packing to burn,
score the shaft sleeve and prevent liquid from
circulating through the stuffing box cooling
the packing. The stuffing box is improperly
packed or adjusted if friction in the box
prevents turning the rotating element by
hand. A properly operated stuffing box should
run lukewarm with a slow drip of sealing
liquid. After the pump has been in operation
for some time, and the packing has been
completely run-in, drippage from the stuffing
box should be at least 40 to 60 drops per
minute. This will indicate proper packing and
shaft sleeve lubrication and cooling.
NOTE: Eccentric run-out of the shaft or
sleeve through the packing could result in
excess leakage that cannot be compensated
for. Correction of this defect is very important.
Packing should be checked frequently and
replaced as service indicates. Six months
might be a reasonable expected life,
depending on operating conditions. It is
impossible to give any exact predictions. A
packing tool should be used to remove all old
packing from the stuffing box. Never reuse
old and lifeless packing or merely add some
new rings. Make sure the stuffing box is
thoroughly cleaned before new packing is
installed. Also check the condition of the shaft
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