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Grundfos NBG Series - Foundation Preparation; Preparing the Foundation; Levelling the Base Frame

Grundfos NBG Series
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English (GB)
17
1: Preparing the foundation
We recommend the following procedure to ensure a
good foundation.
2: Levelling of the base frame
Step
Action
Illustration
1
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
vibrators to ensure that the concrete is
evenly distributed. The top surface should
be well scored and grooved before the
concrete sets. This provides a bonding
surface for the grout.
2
Embed foundation bolts in the concrete.
Allow enough bolt length to reach through
grout, shims, lower base frame, nuts and
washers.
TM03 0190 4707
3
Let the foundation cure for several days
before the base frame is levelled and
grouted.
Step
Action
Illustration
1
Lift/jack up the base frame to the final level
19-32 mm above the concrete foundation,
and support the base frame by means of
blocks and shims both at the foundation
bolts and midway between bolts.
TM04 5183 2809
2
Level the base frame by adding or removing
shims under the base frame.
TM04 0489 0708
3
Tighten the foundation bolt nuts against the
base frame. Make sure the piping can be
aligned to the pump flanges without putting
strain on pipes or flanges.
5-10 mm
Bolt length
above
base frame
Thickness
of base
frame
19-32 mm
allowance
for grout
Base frame
Top of
foundation
is rough
Pipe sleeve
LugWasher
Wedges and
shims left in
place

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