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5. For open lineshaft pumps, with the pump in
operation, there should be some leakage at the
stuffing box packing. The correct leakage rate is
approximately one drop per second. Check the
temperature of the leakage as well as the discharge
head. If the pump runs hot and the leakage begins
to choke off, stop the pump and allow it to cool
down. A few light taps with a hammer on the gland
will upset the packing sufficiently to resume leakage.
After pump has cooled, restart pump and follow
preceding procedure. Run pump 15 minutes, check
leakage, if it exceeds two drops per second, adjust
packing as described in "Packing Adjustment and
Replacement".
6. For enclosed line shaft pumps, adjust the lubricator
valve for the proper flow rate of the lubrication oil.
(See Page 17.)
Preventive Maintenance
Preventive maintenance includes periodic inspection
of oil level in the oil reservoir (for pump with oil lub
column), re-lubrication of electric motors, gear drives
and prime mover. Systematic inspection of the pump
and its components shall be made at regular intervals.
The frequency required depends upon the operating
conditions of the pump and its environment. See Page
19 for Preventive Maintenance Procedures. Consult
the applicable manufacturer's instructions for detailed
information on maintenance for the prime mover,
driveshaft, electric motors and gear drives. Any deviation
in performance or operations from what is expected can
be traced to some specific cause. Variances from initial
performance will indicate changing system conditions,
wear or impending breakdown of the unit.
Before initiating maintenance procedures,
DANGER
disconnect all power sources to the
equipment and accessories completely. Discharge all
parts and accessories which retain electric charge.
Failure to comply may result in severe personnel injury
or death.
PACKING ADJUSTMENT AND REPLACEMENT
Pumps equipped with packing, shall be adjusted
whenever the leakage rate exceeds two drops per second.
If there is no leakage or the stuffing box overheats, do
not back off gland nuts while the pump is running. This
will allow the entire set of rings to move away from the
bottom of the box, without relieving pressure of the
packing on the shaft. Stop the pump and allow packing
to cool then restart the pump.
Be sure to reinstall the coupling guard
WARNING
before restarting the pump.
It may be necessary to repeat this procedure several
times before proper amount of liquid comes through to
efficiently prevent overheating. If leakage is excessive,
adjust the stuffing box as follows:
1. With the pump in operation, tighten the gland nuts
one-quarter turn for each adjustment. Allow packing
to equalize against the increased pressure and
leakage to gradually decrease to a steady rate, before
making another adjustment.
2. With the pump shut down and when packing has
been compressed to the point that the gland is about
to contact the upper face of stuffing box, remove the
split gland, add one extra packing ring and readjust.
If this fails to reduce leakage to two drops per
second, remove all packing rings and replace with
new rings.
Do not over tighten the stuffing box.
CAUTION
Excessive pressure can wear out packing
prematurely and seriously damage the shaft.
3. Remove the packing with the aid of a packing hook.
If a lantern ring is provided, remove it by inserting
a wire hook in the slots of the ring and pull it from
the packing box. Thoroughly clean the stuffing box
of all foreign matter.
4. If the replacement packing is in the form of a
continuous coil or rope, it must be cut into rings
before installing. Tightly wrap one end of the
packing material around the top shaft like one coil
spring, and cut through the coil with a sharp knife.
For repacking sequence, refer to "Stuffing Box
Installation" (page 13).
SEASONAL SHUTDOWN
Manually rotate shaft several times prior
WARNING
to restarting pump, which has been down.
1. For oil lubricated pumps that are shut down for
an extended period of time, it is suggested that the
pump be operated for at least 15 minutes every two
weeks with oil feed wide open 2 hours before and
during startup in order to maintain a film of oil on
the shafting and shaft bearings.
2. For product (or water) lubricated pump, if the pump
is to be shut down for an extended period of time,
operate it for at least 15 minutes with adequate pre-
lubrication every two weeks.
3. Before resuming normal operations, oil should be
changed on drivers, right angle gear and lubricating
oil system. After 15 minutes of operation adjust
lateral.
19
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