Grundfos NB Serie Instrucciones De Instalación Y Funcionamiento página 21

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1: Preparing the foundation
We recommend the following procedure to ensure a
good foundation.
Step Action
Use an approved, non-shrinking concrete.
Contact your concrete supplier for advice if
any doubts.
Pour the foundation without interruptions to
within 19-32 mm of the final level. Use
1
vibrators to ensure that the concrete is
evenly distributed. The top surface must be
well scored and grooved before the
concrete sets. This provides a bonding
surface for the grout.
Embed foundation bolts in the concrete.
Allow enough bolt length to reach through
2
grout, shims, lower part of base frame, nuts
and washers.
Let the foundation cure for several days
3
before levelling and grouting the base
frame.
2: Levelling of the base frame
Step Action
Lift/jack up the base frame to the final level
19-32 mm above the concrete foundation,
1
and support the base frame by means of
blocks and shims both at the foundation
bolts and midway between bolts.
Level the base frame by adding or removing
2
shims under the base frame.
Tighten the foundation bolt nuts against the
base frame. Make sure the piping can be
3
aligned to the pump flanges without putting
strain on pipes or flanges.
Illustration
Bolt length
above
base frame
Thickness
of base
frame
19-32 mm
allowance
for grout
Washer
Lug
Illustration
Base frame
Wedges and
shims left in
place
Top of
foundation
is rough
Pipe sleeve
21
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Nbg serie

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