5
It is important that the suction and discharge pipes “line
up” naturally with the pump. Do Not “pull” pipes into
position with flange bolts or fittings. Both suction and
discharge pipes must be supported independently near
the pump to eliminate any strain on the pump. Piping
should be arranged with as few bends as possible, and,
preferably, with long radius elbow whenever possible. Turn
shaft to see that it rotates freely. If rotor binds, it indicates
a strain on the casing, which must be corrected before
operating pump. It may be necessary to shim motor at
foundation to assist piping connection line-up.
3. WIRING / ROTATION
Check motor name plate for electrical characteristics. Be
sure they are the same as the rating of the electric power
available. Connect power lines to motor in accordance with
the wiring diagram on the motor. Test rotation by jogging
motor. Shaft must rotate in the direction indicated by arrow
cast on pump casing.
NOTE:
These units are designed to operate at a
maximum
speed of 3550 rpm.
C - OPERATION
1. STARTING THE PUMP
The following important items should be checked before
starting.
a. Pump and driver securely bolted
b. Piping complete
c. Motor properly lubricated. Follow the recommendations
found in the Maintenance Section
d. Open the seal flush valve, if used
e. Shaft turns freely
f. Rotation is correct. The pump must rotate in the
direction of the arrow on the casing.
g. Discharge valve. A high or medium head centrifugal
pump operating at full speed with the discharge valve
closed, requires much less power than when operating
at its rated head and capacity with the discharge valve
open.
For this reason, it is usually best to have the discharge
valve only partially open when starting the pump.
WARNING! - Operating the pump with a closed
or partially open discharge valve can result in
excessive heat buildup. Such operation should
be limited to the shortest pratical duration.
Operating the pump at or near shut-off head places
greater loads on the shaft and motor than operation at
the designed flow rate and head.
h. Suction valve, if used, must be fully open. Do not use
suction valve as a throttling device.
i. Pump fully primed
Only after these items have been checked should the
pump be started.
2. PRIMING
CAUTION:
Before starting the pump, the casing and
suction line must be filled with liquid, and air-vented
through the vent pipe plugs. The pump must not be run
until it is completely filled with liquid, because of danger of
injuring some of the parts of the pump which depend upon
liquid for lubrication.
The discharge gate vale should be closed during priming.
Be sure the mechanical seal and power frame are supplied
with the proper lubrication.
See LUBRICATION.
PRIMING BY SUCTION PRESSURE
When operating with suction pressure (flooded suction),
remove the pipe plug at the top of the casing and when
pump is filled with liquid, replace plug.
PRIMlNG WITH FOOT VALVE AND STRAINER
A foot valve and strainer may be installed on the lower end of
the suction pipe to keep pump filled with liquid. Incorporate
filler pipe in discharge pipe between pump and check valve.
Remove pipe plug at top of casing, then fill suction pipe and
pump with liquid. When pump is full of liquid, replace plug
and close filler pipe.
CAUTION:
When a foot valve and strainer are in stalled on
the suction pipe, a spring loaded type check valve
MUST
be
installed next to the pump in the discharge piping to prevent
pump rupture from water hammer shock.
Priming by means of primer pump or ejector, attached to
the pump, will also remove air from suction pipe and pump
casing. When pump is filled with liquid, start motor and
slowly open discharge gate valve.
3. STARTING
Start the pump. When the pump has reached its designed
operating speed slowly open the discharge valve to obtain
the desired capacity and pressure.
With the pump running, carefully check for unusual
vibration, quite operation, mechanical seal function and
unusually high temperature.
WARNING! - NEVER try to adjust or work on
the pump while it is running. Always stop
the unit completely before attempting any
adjustment.
