Xylem P81630E Series VSC and VSCS Base Mounted Centrifugal Pumps - Manual (Page 12)

12
-PF START-UP INSTRUCTIONS
Prior to start-up, back off packing glands or screws until glands
are loose. Re-tighten with fingers until glands are just snug
against the first packing ring. WHEN PUMP IS STARTED,
WATER MAY RUN FREELY FROM PACKING. This is normal
and should be allowed to continue for a period of time before
further tightening the glands. Tighten the gland bolts uniformly,
one flat at a time.
An adequate leakage rate is NOT ONE SINGLE VALVE FOR
ALL pumps and installations, but is the amount required to pro-
vide adequate cooling and lubrication. The required leakage
will be largely influenced by operating pressures, fluid tempera-
ture, shaft speed, etc.
NOTE:
For fluid temperatures in the range of 32° to 190°F average
leakage rates of 60 to 80 drops per minute are recommended.
However, each individual pump and installation will have
unique operating conditions that will result in broadly variable
leakage rate requirements.
At fluid operating temperatures near the upper limit of 190°F,
the maximum temperature rise of the leakage is particularly
important. A packed pump should never operate with steam
forming at the gland. This necessarily limits the temperature
rise to a maximum of about 20°F. If the formation of steam per-
sists at higher leakage rates, cooling water must be provided
by means of an external supply, or a heat exchanger used to
cool the by-pass flush.
NOTE: Do not spread the inner and outer guards more than
necessary for guard removal or installation. Over spreading the
guards may alter their fit and appearance.
REMOVAL
1. Remove the two capscrews that hold the outer (motor side)
coupler guard to the support bracket(s).
2. Spread the outer guard and pull it off the inner guard.
3. Remove the capscrew that holds the inner guard to the sup-
port bracket.
4. Spread the inner guard and pull it over the coupler.
INSTALLATION
1. Check coupler alignment before proceeding. Correct if
necessary.
2. Spread the inner guard and place it over the coupler.
3. With the inner guard straddling the support bracket, install a
capscrew through the hole (or slot) in the support bracket
and guard located closest to the pump. Do not tighten the
capscrew.
4. Spread the outer guard and place it over the inner guard.
5. Install the outer guard capscrews by following the step stated
below which pertains to your particular pump:
a) For pumps with a motor saddle support bracket: Ensure
the outer guard is straddling the support arm, and install
but do not tighten the two remaining capscrews.
b) For pumps without a motor saddle support bracket: Insert
the spacer washer between the holes located closest to
the motor in the outer guard, and install but do not tighten
the two remaining capscrews.
6. Position the outer guard so it is centered around the shaft,
and so that there is less than a 1 /
4
" of the motor shaft
exposed. On guards that utilize a slotted support bracket,
the inner guard will have to be positioned so there is only a
1 /
4
" of the pump shaft exposed.
7. Holding the guard in this position, tighten the three
capscrews.
HEX COUPLER GUARD REMOVAL/INSTALLATION
WARNING: Unexpected Startup Hazard
Disconnect and lockout power before servicing.
Failure to follow these instructions could result in serious
personal injury or death, or property damage.
14. Install the bearing housings. Clean and regrease the bear-
ings and insert into bearing housings. Push the pump shaft
back from the motor end as far as possible, using a lever if
necessary. Hold the shaft in this position. On the outboard
bearing tap inner race until it is properly positioned against
the shaft shoulder. Install and lock the cam lock into posi-
tion. If the shaft and bearing are properly positioned, the
cam lock set screw will fall in the center of the shaft under-
cut. Release the shaft. Install the outboard bearing cap.
Install the inboard bearing by tapping the inner race until it
contacts the shaft shoulder, lock the bearing in place with
the cam lock. Install the inboard bearing cap.
15. Connect flush tubing to seal housing.
16. Replace drain plug.
17. Install coupler and align, following the instructions located in
the section titled “Coupler Alignment.”
18. Install coupler guard. Refer to separate instructions titled
“Hex Coupler Guard Removal/Installation.”
19. Open isolation valves and check pump for leaks. If not
leaking, return pump to service, using the -PF Start-up
Instructions.