Section 5 - Maintenance; Preventive Maintenance; Packing Adjustment And Replacement; Seasonal Shutdown - Xylem Bell & Gossett VTP Serie Manual De Instrucciones

Maintenance – SECTION 5
Maintenance – SECTION 5

PREVENTIVE MAINTENANCE

Before initiating maintenance procedures,
WARNING
disconnect all electric sources to the
equipment and accessories and completely. Discharge
all parts and accessories which retain electric charges.
Failure to comply may result in severe personnel injury
or death.
Preventive maintenance includes periodic inspection
of oil level in the oil reservoir (for pump with oil lube
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
following Preventive Maintenance schedule. 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.
PREVENTIVE MAINTENANCE SCHEDULE
PROCEDURE
Clean dirt, oil and grease from
driver and discharge head.
Clean driver ventilation passage to
prevent overheating.
Change lubrication in gear drive.
Change lubrication in thrust pot.
Check oil level in the reservoir.
It should never be less than ½ full.
Refill, check drip rate.
Tighten all loose bolts and check
for excessive vibration.
If packing is grease lubricated,
add as required.
Check that there is some leakage
through stuffing box while pump is
in operation. Do not tighten gland
nuts unless necessary. Refer to
page 24 for tightening requirement.
Maintain a liquid film of lubrication
between the seal rubbing faces.
Re-grease the motor bearings:
1800 RPM and above
Below 1800 RPM

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.
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:
prematurely and seriously damage the shaft.
TIME INTERVAL
(in operating hours)
As required
As required
2,000 or once a year
See page 27
prematurely and seriously damage the shaft.
24

SEASONAL SHUTDOWN

As required
100
As required
As required
Refer to Motor IOM
Refer to Motor IOM
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.
Do not over tighten the stuffing box.
CAUTION
Excessive pressure can wear out packing
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.
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 re-packing sequence, refer to "Installing the
Stuffing Box" (page 15).
Do not over tighten the stuffing box.
WARNING
Excessive pressure can wear out packing
Prior to restating the pump, manually
WARNING
rotate the shaft several times.
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 the
lateral.
25