Goulds Pumps 3410 - IOM - Manual (Page 41)

2. Blow dry with clean, filtered compressed air. Hold the
two races together, but allow the inner race to rotate a
few turns now and then to dislodge the kerosene from
the retainer pockets.
3. When bearing has been blown dry, oil immediately
with a good grade of clean machine oil to prevent
corrosion or rust.
If there is any question as to the condition of bearings, it is
always best to replace them. This may prevent an
unplanned shutdown.
Check bearing housing seals and replace as required.
COUPLING LUBRICATION
Grid or gear tooth couplings (Falk Grid Steelflex or Falk
Crowned Tooth coupling for instance) are initially lubricated
with Falk Long Term Grease (LTG) and do not require
relubrication for up to three years. If coupling leaks grease, or
is exposed to extreme temperatures or excessive moisture,
more frequent lubrication may be required.
Use coupling manufacturer’s recommended grease to provide
trouble free performance.
Flexible couplings (Wood’s Sure-Flex or Falk Torus 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 types of couplings are used, follow maintenance
instructions of coupling manufacturer.
SEALING INFORMATION
PACKING(NON-ASBESTOS)
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 in operation for some time, and the packing has been
completely run-in, drippage from the stuffing boxes should be at
least 40 to 60 drops per minute. This will indicate proper packing
and shaft sleeve lubrication and cooling.
NOTE: Eccentricity 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 or sleeve for possible scoring or
eccentricity, make replacements where necessary.
New packing (non-asbestos) should be placed carefully into the
stuffing box. If molded rings are used, the rings should be opened
sideways and the joints pushed into the stuffing box first. The
rings are installed one at a time, each ring seated firmly and the
joints staggered at about a 90° rotation from each preceding joint.
MECHANICAL SEALS
General instructions for operation of the various
mechanical sealing arrangements are included below. It is
not feasible to include detailed instructions for all
mechanical seals in this booklet because of the almost
unlimited number of possible combinations and
arrangements. Instead, seal manufacturer’s instructions will
be included as a separate supplement to this book, where
required.
a. Mechanical seals are precision products and should be
treated with care. Use special care when handling
seals. Clean oil and 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
maintenance except routine replacement of worn or
broken parts.
c. A mechanical seal which has been used should not be
put back into service until the 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 as 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.
3410 IOM 1/2010
39
5