Bell & Gossett AC8584D Series HSCS Base Mounted Centrifugal Pumps - Manual (Page 18)

1 8
A Mobile Oil, DTE Medium, or equal, meeting the following
specification will provide satisfactory lubrication. SImilar oils
can be furnished by all major oil companies. It is the responsi-
bility of the oil vendor to supply a suitable lubricant.
(1) Saybolt viscosity at 100ºF . . . . . . . . . . 215 SSU-240 SSU
(2) Saybolt viscosity at 210ºF . . . . . . . . . . . . . . . . . . . 49SSU
(3) Viscosity index, minimum. . . . . . . . . . . . . . . . . . . . . . . . 95
(4) API gravity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-33
(5) Pour point, maximum . . . . . . . . . . . . . . . . . . . . . . . . +20ºF
(6) Flash point, minimum . . . . . . . . . . . . . . . . . . . . . . . . 400ºF
(7) Additives . . . . . . . . . . . . . . . . . Rust & Oxidation inhibitors
(8) ISO viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
56;,! 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 stime 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 moister, dirt, or signs of “break-
down,” especially during the fist 1000 hours.
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a. Mechanical seals are precision products and should be
treated with care. Use special care when handling seals.
Clean parts are essential to prevent scratching the finely
lapped sealing faces. Even light scratches on these faces
could result in leaky seals.
b. Normally, mechanical seals require no adjustment or main-
tenance, except routine replacement of worn, or broken
parts.
c. A mechanical seal which has been used should not be put
back into service until sealing faces have been replaced or
relapped. (Relapping is generally economical only in seals
two inches in size and above.)
Four important rules which should always be followed for
optimum seal life are:
1. Keep the seal faces clean as possible.
2. Keep the seal as cool as possible.
3. Assure that the seal always has proper lubrication.
4. If seal is lubricated with filtered fluid, clean filter
frequently.
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When a pump with 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 package.
56;,! Eccentric run-out of the shaft or sleeve through the
packing could result in excessive leakage that cannot be com-
pensated for. Correction of this defect requires shaft and/or
sleeve replacement. Packing should be checked frequently
and replaced as service indicates. Six months might be a rea-
sonable expected life, depending on the operating conditions.
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A short section of pipe so designed that it can be readily
dropped out of the line can be installed adjacent to the suction
flange. With this arrangement, any matter clogging the
impeller is accessible by removing the pipe section.
If the pump cannot be freed of clogging after the above
methods have been tried, dismantle the unit as previously
described to locate the trouble.
*(<;065!
Do not over oil; this causes the bearings to run hot.
The maximum desirable bearing housing operating
temperature for all ball bearings is 180º)F. Should the
temperature of the bearing frame exceed 180º)F (measured
by thermometer) shut down pump to determine the cause.
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