RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
21
G. PRE-INSTALLATION PROCEDURES.
1. Check the pump foundation and confirm the
bolting surface is flat and the bolt pattern is
correct.
2. Slowly lower pump onto the foundation.
3. Rotate the pump by hand. Check for any
mechanical hesitation, binding or any
acoustically transmitted signals from the pump.
Hand rotation should be smooth and silent.
Install the pump to foundation bolting and
tighten to the system torque values. The pump
should be rotated frequently during the
procedure to tighten down the pumping unit.
4. After the pumping unit has been completely
tightened down to the foundation, confirm that
there is no binding.
5. Connect the piping.
H. PIPING. All piping should be independently
supported near the pump so that pipe strain will not be
transmitted to the pumping unit.
CAUTION
All piping connections must be made with the
pipe in a freely supported state. Do not apply
vertical or side pressure to align the piping with
the pump flange.
Before connecting the suction, discharge, and
auxiliary piping, check to see that the piping is
absolutely clean internally. Any debris in the
piping will be drawn into the pump
passageways and can cause extreme damage.
The internal diameters of the suction and
discharge lines must be equal to the internal
diameters of the pump suction and discharge
nozzles.
The pump is shipped with flange covers to protect flange
faces and to prevent foreign matter from entering the
pump. Flange covers should remain intact until suction
and discharge piping are connected to pump flanges.
Suction lift lines shall be laid with a rising slope toward
the pump and suction headlines with a downward slope
towards the pump.
The suction pipe must be air tight and sloped upward to
pump flange to avoid air pockets which will impair pump
operation. The discharge pipe should be as direct as
possible using a minimum number of valves to reduce
pipe friction losses.
Never use a straight taper (concentric) reducer in a
horizontal suction line because air pockets may form in
the top of the reducer and the pipe. Use an offset
(eccentric) reducer instead.
It is recommended to install a check valve and closing
valve in discharge line and closing valve in suction line,
depending on the type of plant and pump. The check
valve, between the pump and valve, protects pump from
water hammer and prevents reverse rotation in the
event of power failure. Closing valves are used in
priming, starting, and pump shut down. Pump must
never be throttled by use of a valve in the suction line.
Thermal expansions of the pipeline must be
compensated by appropriate measures so as not to
impose any extra loads on the pump exceeding the
permissible pipeline forces and moments. Refer to Table
8 for permissible forces and moments.
The coupling should be realigned after installing piping
or when hot service units are at the final operating
temperature. Refer to Section VII, Paragraph F for
coupling alignment.
I. AUXILIARY PIPING CONNECTIONS AND
GAUGES. In addition to primary piping connections, the
pump may require other connections such as gauges or
drains. All these lines and gauges should now be
installed. Refer to Figure 2 and vendor mechanical seal
drawing for seal line connections to the mechanical seal.
J. MOTOR. See motor vendor’s manual for motor
information and information on connecting to the power
supply.
CAUTION
Connection to the power supply must be
effected by a trained electrician only. Check
available main voltage against the data on the
motor rating plate and select appropriate start-
up method.
K. DIRECTION OF ROTATION. Correct pump rotation
is indicated by an arrow on the bearing frame. The
standard direction of rotation, viewed from the motor
end, is clockwise.
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