Flowserve L Worthington Simpson User Manual

Page 13

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L and U USER INSTRUCTIONS ENGLISH 85392721 07-12

Page 13 of 36

flowserve.com

If not supplied, guarding shall be fitted as necessary
to meet the requirements of ISO 12100 and EN953
and or any applicable local safety regulations.

4.4 Grouting

Where applicable, grout in the foundation bolts.

After adding pipework connections and rechecking the
coupling alignment, the baseplate should then be
grouted in accordance with good engineering practice.
Fabricated steel, cast iron and epoxy baseplates can be
filled with grout. Folded steel baseplates should be
grouted to locate their packing pieces. If in any doubt,
please contact your nearest service centre for advice.

Grouting provides solid contact between the pump
unit and foundation, prevents lateral movement of
running equipment and dampens resonant vibrations.

Foundation bolts should only be fully tightened when
the grout has cured.

4.5 Initial alignment


4.5.1

Thermal expansion

The pump and motor will normally

have to be aligned at ambient temperature and
should be corrected to allow for thermal expansion at
operating temperature. In pump installations
involving high liquid temperatures, the unit should be
run at the actual operating temperature, shut down
and the alignment checked immediately.

4.5.2

Alignment methods

Pump and driver must be isolated

electrically and the half couplings disconnected.

The alignment MUST be checked.

Although the pump will have been aligned at the
factory it is most likely that this alignment will have
been disturbed during transportation or handling. If
necessary, align the motor to the pump, not the pump
to the motor.

Horizontal pumps – L and U pumps
Alignment is achieved by adding or removing shims
under the motor feet and also moving the motor
horizontally as required. In some cases where the
alignment cannot be achieved it will be necessary to
move the pump before recommencing the above
procedure.

Vertical pumps – LV and UV
Adding or removing shims between the motor stool
and the pump casing achieves alignment. The
motor/motor stool assembly may also have to be
moved horizontally at the interface with the pump
casing, as required.

It should be noted that the motor has a spigot
(rabbet) fit into the motor stool and it is therefore not
possible to achieve any horizontal movement at this
interface.

For couplings with narrow flanges use a dial indicator
as shown below to check both parallel and angular
alignment. The alignment values are maximums for
continuous service.

Parallel

Angular


Maximum permissible misalignment at working
temperature:

Parallel 0.2 mm (0.008 in.) TIR

Angular 0.1 mm (0.004 in.) TIR


When checking parallel alignment, the total indicator
read-out (TIR) shown is twice the value of the actual
shaft displacement.
Align in the vertical plane first, then horizontally by
moving motor.

While the pump is capable of operating with the
maximum misalignment shown above, maximum
pump reliability is obtained by near perfect alignment
of 0.05 to 0.10 mm (0.002 to 0.004 in.) TIR parallel and
0.05 mm (0.002 in.) per 100 mm (4 in.) of coupling
flange diameter as TIR angular misalignment. This
covers the full series of couplings available.

Pumps with thick flanged non-spacer couplings can
be aligned by using a straight-edge across the
outside diameters of the coupling hubs and
measuring the gap between the machined faces
using feeler gauges, measuring wedge or calipers.

When the electric motor has sleeve bearings it is
necessary to ensure that the motor is aligned to run
on its magnetic centreline.

Refer to the motor manual for details.

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