Flowserve QLQ Vertical Worthington - Manual (Page 37)

QLQ, QLQC USER INSTRUCTIONS ENGLISH 87900027 – 06/14
Page 37 of 61
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All threads should be checked for damage and
repaired if necessary. If filing is necessary,
remove the part from the pump if possible, or
arrange to catch all the filings so they do not fall
onto other parts of the pump. Clean all threads
with a wire brush and approved cleaning solvent,
ends of shafts must be cleaned and any burrs
removed since alignment depends on the shaft
ends butting squarely. Lubricate all threaded
connections with a suitable approved thread
lubricant (an approved anti-galling compound
should be used on stainless mating threads).
k) On pumps equipped with mechanical seals, clean
fluid should be put into the seal chamber. With
pumps under suction pressure, this can be
accomplished by bleeding all air and vapor out of
the seal chamber and allowing the fluid to enter.
With pumps not under suction pressure, the seal
chamber should be flushed liberally with clean fluid
to provide initial lubrication. Make sure the
mechanical seal is properly adjusted and locked
into place. Insure that all seal spacers are
removed prior to operation.
l) On pumps equipped with thrust bearing in the
pump, ensure that the thrust bearing support is
filled with the correct level of oil, by checking the
level through the sight glass. If the thrust bearing
has the cooling water installed, check that the
flush if cooling water is turned on before starting
the pump.
m) If provided, check that the external flushing of the
mechanical seal is turned on.
5.8.1.1 Typical safety guards
A screen guard is furnished with all pumps
having a two-piece headshaft or an adjustable
flanged coupling. This screen must be secured in
place prior to pump startup to prevent possible
contact with rotating parts. Typical arrangement is
shown in section 5.8.1.1.
5.8.2 Stuffing box adjustment (if installed)
On the initial starting it is very important that the
packing not be tightened excessively. New packing
must be run in properly to prevent damage to the shaft
and shortening of the packing life.
The stuffing box must be allowed to leak for proper
operation. The proper amount of leakage can be
determined by checking the temperature of the
leakage, this should be cool or just lukewarm - NOT
HOT - usually 40 to 60 drops per minute will be
adequate.
When adjusting the packing gland, bring both nuts
down evenly and in small steps until the leakage is
reduced as required. The nuts should only be
tightened about one half turn at a time at 20 to 30
minute intervals to allow the packing to "run-in".
Under proper operation, a packing set will last a long
time. Occasionally a new ring of packing will need to
be added to keep the box full.
G U A R D S
IN S TALLED