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6.4.4. Alignment of pump-motor unit

The pump-motor units positioned on a baseplate

and with a flexible coupling are aligned before leaving
the factory.
The pump and motor assembly can lose alignment
during shipping. Final alignment must be accompli-
shed in the field.

After installation is completed with tightening of

anchor bolts and connection of pipes,

alignment of the coupling must be

rechecked before starting the pump.

If necessary,

the unit must be re-aligned.

6.4.5. Pump motor unit with N-EUPEX coupling

Remove the coupling guard and with a dial indicator or
thickness  gauge,  make  sure  the  distance  (3-4  mm)
between the halfcouplings is the same along the entire
periphery.
With  a  dial  indicator  or  straight  edge,  check  the  alignment
(coaxiality) of the external part of the halfcouplings.
Control  procedure  must  be  performed  at  4  diametrically
opposed, equidistant points on the periphery

(fig. 6A)

For adjustment, loosen or tighten the screws where

necessary in order to move the position of the support

feet on the baseplate and to add calibrated plates

between the feet and baseplate wherever these may

be required.

Make sure the rotor turns freely when moved by hand.

The alignment must be rechecked once the unit

attains its operating temperature.

While the foundation is still new and the unit has not

been fully tested under all operating conditions, verifi-

cation of alignment must be repeated at regular inter-

vals and, if necessary, alignment procedure must be

carried out again.

6.4.6. Pump motor unit with Rex-Viva coupling

Remove the coupling guard, loosen the screws and

remove the half-couplings.

With a dial indicator or straight edge, check the coaxial

alignment of the hubs fixed at motor shaft and pump

shaft.

Control procedure must be performed at 4 diametrically

opposed, equidistant points on the periphery (fig. 6B).

For adjustment, loosen or tighten the screws where
necessary in order to move the position of the support
feet on the base-plate and add calibrated plates

between the feet and base-plate wherever these may
be required.
Reassemble the half-couplings following this sequence:
- Insert the two central screws of the first half-coupling.
- Insert and tighten the two central screws of the

second half-coupling at the required torque.

- Tighten the two central screws of the first half-cou-

pling at the required torque.

- Insert the two lateral screws of the first half-coupling.
- Insert and tighten the two lateral screws of the

second half-coupling at the required torque.

- Tighten the two lateral screws of the first half-coupling

at the required torque

- Repeat the sequence for the last screws.
Tighten the screws at the torque advised by the manu-
facturer on the coupling instructions.
Make sure the rotor turns freely when moved by hand.
The alignment must be rechecked once the unit attains
its operating temperature.
While the foundation is still new and the unit has not
been fully tested under all operating conditions, verifi-
cation of alignment must be repeated
at regular intervals and, if necessary, alignment proce-
dure must be carried
out again.

ATTENTION:  poor  baseplate  installation  and  misali-
gnment  of  units  or  faulty  connection  of  pipes  will
cause  vibration  and  early  wear  of  elastic  coupling
inserts,  bearings,  the  seal  and  other  internal  parts

(see also

sections 6.4.1., 6.4.3., 6.4.5.

6.4.7. Extra support for bearing housing

In order to reduce problems caused by expansion or
residual external stress in pipes,

N, N4 pumps

may be

fitted with a support and anchoring foot which will help
to impede variation of alignment to an extent that might
cause damage.
The recommended dimensions are indicated (in mm)
in

fig. 7

During alignment operations, before connection of pipe,

leave support foot screws untightened so as to avoid

stress by pipe strain or shifting of axis height.

The support foot must be placed on the base surface

and brought into contact with the support itself only

after completion of alignment procedure, which must

be re-checked after tightening the screws between

pump casing feet and baseplate.

First tighten the screws joining the foot and the base

and then, the screw between the foot and the support.

In this way, alignment will not be altered by the support