Xylem 8100 Series Centrifugal Pumps AC2515 REV.C - Manual (Page 20)

OPERATION
PRE-START CHECKS
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.
WARNING: Electrical Shock Hazard
Electrical connections to be made by a
qualified electrician in accordance with all
applicable codes, ordinances, and good practices.
Failure to follow these instructions could result in
serious personal injury or death, or property
damage.
Before the initial start of the pump, make the
following inspections:
1. Check alignment between pump and
motor. See the section on alignment for
alignment requirements.
2. Check all connections to motor and
starting device with wiring diagram. Check
voltage, phase, and frequency on motor
nameplate with line circuit.
3. Check suction and discharge piping and
pressure gauges for proper operation.
4. Turn rotating element by hand to assure
that it rotates freely.
5. Check stuffing box adjustment, lubrication,
and piping.
6. Check driver lubrication.
7. Assure that pump bearings are properly
lubricated.
8. Assure that coupling is properly lubricated,
if required.
9. Assure that pump is full of liquid and all
valves are properly set and operational,
with the discharge valve closed and the
suction valve open. Purge all air from top
of casing.
10. Check rotation. Be sure that the driver
operates in the direction indicated by the
arrow on the pump casing as serious
damage can result if pump is operated
with incorrect rotation. Check rotation
each time the motor leads have been
disconnected.
PRIMING
If the pump is installed with a positive head on the
suction, it can be primed by opening the suction
valve, and loosening the vent plug on top of the
casing (Do not remove), allowing air to be purged
from the casing.
If the pump is installed with a suction lift, priming
must be done by other methods such as foot
valves, ejectors, or by manually filling the casing
and suction line.
CAUTION:
Under either condition, the pump must be
completely filled with liquid before starting. The
pump must not run dry. Serious damage to the
pump may result if it is started dry.
Flushing
New and old systems should be flushed to
eliminate all foreign matter. Heavy scale,
welding splatter and wire or other large
foreign matter can clog the pump impeller.
This will reduce the capacity of the pump
causing cavitation, excessive vibration,
and/or damage to close clearance parts
(wear rings, seals, sleeves, etc.).
Filling
Vents should be located at the highest point
so entrained gases and air can escape.
However, if the gases are flammable, toxic, or
corrosive they should be vented to an
appropriate place to prevent harm to
personnel or other parts of the system. Pipe
hangers and anchors should be checked to
make sure they are properly set to take the
additional weight of the pumpage.
All drains should be closed when filling the
system. Filing should be done slowly so that
excessive velocities do not cause rotation of
the pumping elements which may cause
damage to the pump or its driver. The
adequacy of the anchors and hangers may
be checked by mounting a dial indicator off of
any rigid structure not tied to the piping and
setting the indicator button on the pump
flange in the axial direction of the nozzle. If
the indicator moves, as the filling proceeds,
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