Section 4 - Pump Start Up And Operation - Xylem Bell & Gossett VTP Serie Manual De Instrucciones

2. For open lineshaft pump, make sure the stuffing box
bleed line is connected (if applicable). For enclosed
lineshaft pump, make sure the oil lubrication
piping is connected and oil reservoir filled with the
recommended oil. (See page 15 and 18.)
3. For pump with mechanical seal, make sure
mechanical seal is properly lubricated and all
piping to seal is connected. Also, check that all
cooling, heating and flushing lines are operating and
regulated.
4. For open lineshaft pump, when water level
exceeding 30 feet, pre-lubrication is necessary. If
it is equipped with prelube system supplied from a
pressurized header, open the supply valve and allow
the prelube water to flow for 15 seconds plus 15
seconds per 100 ft of pump setting. If it is equipped
with a tank type prelube system, open the valve
between the prelube tank and the pump and allow
approximately half of the water in the tank to run
into the pump before start the pump. The prelube
valve should remain open during the start up.
5. For oil lubricated pump, clean and fill the lubricator
tank with recommended oil. (See page 27.)
Manually open the lubricator valve and allow oil
to run into the shaft enclosing tube for at least
20 minutes for each 100 feet of setting prior to
start up. On the system equipped with a solenoid
operated lubricator valve that cannot be energized
independently, it will be necessary to remove the
valve stem to allow the oil to flow into the tube. If
the start up is delayed or the pump has been shut
down for over 150 hours, the lubrication procedure
must be repeated just prior to actual start up.
6. Open the air release system isolation valve.
Adjusting the air release system throttling device so
that it is partially open. It should not be closed or
fully open.
NOTE: Not exhausting the air or exhausting it too fast
can damage the pump.
7. All connections to driver and starting device match
wiring diagram. Voltage, phase and frequency on
motor nameplate agree with line current.
8. Rotate shaft manually to ensure impellers are not
binding.
9. Verify that driver bearings are properly lubricated
and check oil level in housing.
10. Inspect discharge piping connection, valves and
pressure gauges for proper operation.
24
PUMP STARTUP
1. Partially close the valve in the discharge line.
2. Start the pump. If any abnormal noises, jerking
or vibration is noted, stop the pump immediately,
determine the cause of the abnormalities and correct
them.
3. After the pump is operating at full speed, slowly
open discharge valve. If driver overheats or there is
excessive vibration, stop the pump, determine the
causes and correct them.
4. If the air release valve is manually operated, close it.
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 18.)
7. For pump with mechanical seal, If seal leaks slightly
at startup, allow a reasonable amount of time for
seal to adjust itself. Liquids with good lubricating
qualities normally take longer to wear in the seal
than liquid with lesser qualities. When a seal starts
out with a slight leak and gets progressively less
while running, it is indicative of leakage across the
seal faces. Continued running will eliminate this.
Where leakage occurs immediately and remains
constant, unaffected by running, it usually indicates
secondary seal (Shaft packing) damage, or seal faces
are warped out of flat.