Grundfos NK Serie Montage- Und Betriebsanleitung Seite 14
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3: Preliminary alignment
Warning
Before starting work on the pump, make sure that the
power supply has been switched off and cannot be
accidentally switched on again.
The pump and motor are pre-aligned on the base frame from the
factory. Some deformation of the base frame may occur during
transport and it is therefore essential to check the alignment at
the installation site prior to final grouting.
A flexible coupling will only compensate for minor misalignments
and must not be used to compensate for excessive misalignment
of the pump and motor shafts. Inaccurate alignment results in
vibration and excessive wear on the bearings, shaft or wear rings.
Step
Action
Embed reinforcing steel bars into the foundation by means
of 2K anchor adhesive glue.
The number of steel bars depends on the size of the base
1
frame, but it is advisable to distribute a minimum of 20 bars
evenly over the whole area of the base frame. The free end
of the steel bar must be 2/3 the height of the base frame to
ensure a proper grouting.
Soak top of concrete foundation thoroughly, then remove
2
surface water.
3
Ensure proper shuttering at both ends of the base frame.
If necessary, check the levelling of the base frame again
before grouting. Pour non-shrinking grout through the
openings of the base frame until the space underneath the
base frame has been filled completely.
Fill the formwork with grout up to the base frame top
Allow the grout to dry thoroughly before attaching piping to
the pump. 24 hours is sufficient time with approved
4
grouting procedure.
When the grout has thoroughly hardened, check the
foundation bolt nuts, and tighten, if necessary.
Approximately two weeks after the grout has been poured,
or when the grout has thoroughly dried, apply an oil-based
paint to the exposed edges of the grout to prevent the grout
from getting into contact with air and moisture.
14
Warning
Carry out alignment of the motor only, as pipe strain
will occur if the pump is shifted.
Carry out alignment of the motor by placing shims of different
thickness under the motor. If possible, replace several thin shims
with one thick shim.
See section
7.3
Alignment.
4: Grouting
Grouting compensates for an uneven foundation, distributes the
weight of the unit, dampens vibrations and prevents shifting. Use
an approved, non-shrinking grout. If you have questions or
doubts about the grouting, please contact an expert on grouting.
Base frame
level.
19-32 mm
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grout
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Formwork
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Illustration
Minimum 20 bars
Shuttering
Grout
Levelling
wedges or shims
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left in place
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Top of foundation
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