English (GB)
16
8.5 Foundation of NB, NBG pump with base
frame
This section applies only to 50 Hz pumps as base
frames are not supplied for 60 Hz pumps.
We recommend that you install the pump on a plane
and rigid concrete foundation which is heavy enough
to provide permanent support for the entire pump.
The foundation must be capable of absorbing any
vibration, normal strain or shock. As a rule of thumb,
the weight of the concrete foundation should be 1.5
times the weight of the pump.
The foundation should be 100 mm larger than the
base frame on all four sides. See fig. 13.
Fig. 13 Foundation, X = min. 100 mm
The minimum height of the foundation (h
f
) can then
be calculated:
The density () of concrete is usually taken as 2,200
kg/m
3
.
Place the pump on the foundation, and fasten it. The
base frame must be supported under its entire area.
See fig. 14.
Fig. 14 Correct foundation
Fig. 15 Incorrect foundation
Fig. 16 Base frame with pouring holes
It is important to prepare a good foundation prior to
the installation of the pump.
NB, NBG pumps with base frame are always
prepared for grouting (grouting anchors welded onto
the base frame).
For NB, NBG pumps with 2-pole motors ≥ 55
kW, grouting of the base frame is mandatory
in order to prevent vibration energy from the
rotating motor and liquid flow to evolve.
Procedure
1. Preparing the foundation
2. Levelling of the base frame
3. Grouting.
TM05 1558 2709
h
f
=
m
pump
× 1.5
L
f
× B
f
×
concrete
TM05 1559 2709
TM05 1560 2709TM05 1561 2709
P2 ≤ 45 kW P2 ≥ 55 kW
2-pole Grouting optional Grouting mandatory
4-pole Grouting optional
6-pole Grouting optional
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