Grundfos NB Installation And Operating Instructions Manual page 23

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Base frame with pouring holes
It is important to prepare a good foundation before
installing the pump.
NB, NBG pumps with base frame are always
prepared for grouting.
Grouting anchors are welded to the base frame.
For NB, NBG pumps with 2-pole motors equal to
or bigger than 55 kW, grouting of the base frame
is mandatory in order to prevent vibration energy
from the rotating motor and liquid flow to evolve.
P2 lower than or
Poles
equal to 45 kW
2-pole
Grouting optional
4-pole
Grouting optional
6-pole
Grouting optional
5.4.1 Procedure of installing the product on the
foundation
5.4.1.1 Preparing the foundation
Contact your concrete supplier for advice if
any doubts.
Follow the steps below to ensure a good foundation:
1. Use an approved, non-shrinking concrete.
2. Pour the foundation without interruptions to
within 0.75 - 1.25 inches (19-32 mm) of the final
level.
P2 equal to or higher
than 55 kW
Grouting mandatory
3. Use vibrators to ensure that the concrete is evenly
distributed.
4. Embed anchor bolts in the concrete.
5. Allow enough bolt length to reach through grout,
shims, lower part of base frame, nuts and
washers. See the figure below.
1
2
3
4
5
Pos.
Description
1
Bolt length above the support rail
2
Thickness of the support rail
19-32 mm (0.75 - 1.25 in) allowance
3
for grout
4
Washer
5
Lug
6
Pipe sleeve
7
Foundation with rough top
8
Wedges and shims left in place
9
Support rail
10
5-10 mm (0.2 - 0.4 in.)
6. Let the foundation cure for several days before
levelling and grouting the base frame.
10
9
8
6
7
23

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