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quality is not sufficient, add shims between ground and base plate.
Distortion on base plate surface should be limited to 0,4mm/m after the
baseplate is definitively fastened to foundations.
Coupling alignment is checked before shipment (pumps and
motor deliver ed on a common baseplate) If coupling is not
correctly aligned after installation works are done this indicates that the
baseplate has become twisted and leveling should be corrected by re‐
shimming.
Even if foundation works have been done with care, it is necessary to
check coupling alignment after the baseplate is definitively secured to
the foundation.
7.1.2
ANCHORING
Chemical anchoring device should be preferred to fasten a baseplate on
an existing foundation.
Anchor bolts can be used if foundation block is to be built.
1 – Anchor bolt
2 – Baseplate
3 – Concrete foundation block
Folded steel fabricated baseframes will be grouted to insure its rigidity.
Using of shrink free grout is the most efficient. Grouting ensures correct
positioning of the baseframe and reduces vibrations transmission to civil
work. Foundation work surface preparation and leveling of baseframe
will be performed in the state of the art and should be done before
grouting of the baseplate.
Foundation bolts should be fully tightened only after the
grout has cured.
Installation without foundation :
1 – Intermediate plate
2 – Nut
3 – Leveling element
4 – Foot base
5 – Washer
6 – Fastening nut
7 – Washer
8 – Baseplate fastening screw
7.1.3
POSITIONING
Pump baseplate (cast iron base plate or fabricated steel baseframe)
should be installed horizontally to ensure bearings lifetime and proper
flow of pumped fluid.
7.1.4
COUPLING ALIGNMENT
Pumpsets assembled with a flexible coupling (except pump variants
equipped with a IEC lantern) must be aligned after the baseframe has
been definitively fastened to the foundation. Use low thickness shims
(0,2 to 1 mm) to modify coupling alignment. Adjust the motor height
first. Sometimes it is necessary to add shims under pump feet too.
Aligment of coupling should be performed with particular care
when the pumpset is installed in an hazardous area. Correct
alignment will avoid abnormal increasing of the pump and motor ball
bearings temperature.
Thermal expansion : the pump and motor will normally have to be
aligned at ambient temperature with an allowance for thermal
expansion at operating temperature. In pump installation involving high
liquid temperatures, alignment should be checked again when operating
temperature is reached (pump and piping). Alignment quality should be
checked just after machine shut down.
Pump and driver must be isolated electrically before alignment
operations are performed.
Pump and motor were aligned before dispatch. If it is necessary to
use very thick shims to adjust coupling alignment on site this
means that the baseplate is twisted. Leveling has to be modified.
Checking the coupling alignment :
Check distance between the two half couplings.
Check radial and axial deviation.
Several types of flexible couplings can be used. Refer to coupling
operating instructions to know adjustment values and
misalignment limits.
Several methods can be used to make coupling alignment. Choice of a
method will depend on the type of equipments available on site. Two
operating methods are briefly described hereafter. They can be used if
basic metrology equipments are available :
Using a straight‐edge and a caliper :
Using a dial gauge :
When checking parallel alignment, the total indicator read‐out
shown is twice the value of the actual shaft displacement.
Align in the vertical plane first, then horizontally by moving the motor.
Lifetime of ball bearing and coupling flexible part as well as pumpset
noise level will depend on the alignment quality.
Coupling alignment is not necessary when a IEC adaptation lantern is
used. Both motor and pumps shaft are aligned by construction.
13
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