Grundfos NBS Serie Instrucciones De Instalación Y Operación página 12

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5.1.1 Preparing the foundation
We recommend the following procedures to ensure a good
foundation:
1. Pour the foundation without interruption to 0.75 to 1.25
inches (19 to 32 mm) of the final level.
Use an approved, non-shrinking concrete. Contact your
concrete supplier for advice if any doubts.
2. Use 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.
3. Embed anchor bolts in the concrete.
Allow enough bolt length to reach through grout, shims, the
lower part of the support rail, nuts and washers.
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5
Pos.
Description
1
Bolt length above the support rail
2
Thickness of the support rail
3
0.75 - 1.25 in. (19-32 mm) allowance for grout
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Washer
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Lug
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Pipe sleeve
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Foundation with rough top
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Wedges and shims left in place
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Support rail
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0.2 - 0.4 in. (5-10 mm)
4. Let the foundation cure for several days before levelling and
grouting the support rail.
5. Apply grout if needed.
NBS pumps do not require grouting to maintain shaft alignment,
but grouting will increase pump stability within the pipe system.
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.
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5.1.2 Levelling of the product without base frame
1. Level the pump shaft and the flanges by using a spirit level and
adjusting the wedges or shims as required.
2. Tighten the anchor bolt nuts. Make sure the piping can be
aligned to the pump flanges without putting strain on the pipes
or the flanges.
5.1.3 Levelling of the product with base frame
1. Lift or jack up the base frame to the final level, 0.75 - 1.26
inches (19-32 mm) above the concrete foundation. Level the
pump shaft and flanges by using a spirit level and adjusting the
wedges or shims, as required.
A indicates an allowance of 0.75 - 1.26 inches (19-32 mm).
2. Tighten the anchor bolt nuts. Make sure the piping can be
aligned to the pump flanges without putting strain on the pipes
or the flanges.

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