Grundfos NB Original Installation And Operating Instructions page 13

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1: Pouring of 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 to
1
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.
Embed foundation bolts in the concrete. Allow enough
2
bolt length to reach through grout, shims, lower base
frame, nuts and washers.
Let the foundation cure for several days before the base
3
frame is levelled and grouted.
2: Shimming of base frame
Step
Action
Lift/jack up the base frame to the final level 19-32 mm
above the concrete foundation, and support the base
1
frame by means of blocks and shims both at the
foundation bolts and midway between bolts.
Level the base frame by adding or removing shims under
2
the base frame.
Tighten the foundation bolt nuts against the base frame.
3
Make sure the piping can be aligned to the pump flanges
without putting strain on pipes or flanges.
18
Illustration
Bolt length
above base
frame
Thickness of
base frame
19 to 32 mm
allowance for
grout
Washer
Lug
Illustration
Base frame
Wedges and
shims left in
place
Top of foundation
left rough
Pipe sleeve

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