Operation
FLEXIBLE COUPLED PUMPS
CLOSE COUPLED PUMPS
3A Rotation
The standard direction of rotation
for the pump is right handed, or
clockwise, when looking at the
motor end of the pump. A rotation
arrow, refer to Figure 3-1, is located
on the pump to indicate the correct
direction of rotation.
Operating the pump in reverse will
cause substantial performance
variations and can damage the
pump.
Always confirm correct motor
rotation prior to connection of the
coupling. If this is not possible,
perform a final rotation check as
follows:
1. Jog the motor briefly.
2. Observe rotation as the unit
comes to a stop.
3. Rotation should be in the
direction of the arrow.
If the motor operates in the wrong
direction:
1. Interchange any two leads on a
three phase motor.
Figure 3-1
2. On a single phase motor, change
the leads as indicated on the
connection box cover. Some
single phase motors may not be
reversible.
3B Inlet and Outlet Locations
(Refer to Figure 3-1)
The pump inlet is located on the
end farthest from the motor. The
discharge or “outlet” can be on the
top, side, or bottom depending on
the model and construction of the
pump. Normal discharge position is
on top.
3C Foreign Material
All regenerative turbine pumps
have close running clearances in
order to maintain efficiency. Take
extra precautions to insure that no
foreign material larger than 25
microns or .001 inches is allowed
to pass through the pump. Even
particles of this size will damage the
pump if allowed to circulate
continuously. Regenerative turbine
pumps are not designed for slurries.
Large particles, weld spatter, and
other material found in new piping
systems will bend the impeller
vanes and can sometimes lock up
the pump. If a new pump does not
operate properly, the first thing to
check for is damage from foreign
material.
3D Electrical
It is important to be aware of and
follow the appropriate local and
national electrical codes. Do not
make wiring alterations that can
affect motor rotation without
A. Rotation
B. Inlet and Outlet Locations
C. Foreign Material
D. Electrical
E. Adjustments
F. Cooling Water
G. Priming
H. Starting
I. Stopping
3.
Page 506
reconfirming correct rotation.
Select starter heaters and wiring for
the maximum current the motor can
use at full service factor loads.
Regenerative turbine pumps will
typically use extra power for a
period until they run in. This can
take three to four weeks depending
on the duty cycle. During this
period, impellers are finding their
hydraulically balanced position.
3E Adjustments
No adjustments are required or
advisable on new pumps, other
than those required for installation.
Because of the tight tolerances of
regenerative turbine pumps, it is not
uncommon for the pump to be
difficult to turn over by hand after
the internal parts have been
allowed to dry out . New pumps
from the factory are tested using
rust inhibiters to help preclude this
possibility. On site system flushing
may remove these inhibitors and
subject the pump to the risk of lock
up, if it is allowed to dry out. In this
case, do the following:
1. Fill the pump with fluid (wait 2
hours).
2. Insert 5/32" Allen wrench into
lock collar setscrew and rotate
shaft, using the Allen wrench as
a handle. (DO NOT LOOSEN
SETSCREW)
3. Remove the Allen wrench.
4. Jog the pump momentarily using
the on/off buttons if so equipped.
5. This should “break” the impeller
loose without damage, unless
foreign material has entered the
pump.
Inlet
Rotation
Outlet
Rotation
Inlet
Outlet
Outlet
Inlet
Rotation
T51 SERIES
