Installation Positions; Foundation Of Nb, Nbg Pump Without Base Frame - Grundfos NB Serie Instrucciones De Instalación Y Funcionamiento

8.2 Installation positions

Arrows on the pump housing show the direction of
flow of liquid through the pump.
The pumps can be installed with the motor/pump
shaft in all positions between vertical and horizontal,
but the motor must never fall below the horizontal
plane.
Horizontal motors with feet must always be
supported.
0.25 - 200 kW
0.25 - 37 kW
Fig. 11 Installation positions
Fit isolating valves on either side of the pump as this
makes it unnecessary to drain the system if the
pump needs to be cleaned or repaired.
8.3 Foundation of NB, NBG pump without
base frame
Carry out the foundation/installation in
accordance with the following instructions.
Caution
Non-compliance may result in functional
faults which will damage the pump
components.
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 must be at
least 1.5 times the weight of the pump. The concrete
foundation must have an absolutely level and even
surface.
Place the pump on the foundation, and fasten it. See
fig. 12.
Fig. 12 Foundation
The foundation length and width must always be 200
mm larger than the length and width of the pump.
See fig. 12.
The minimum height of the foundation, h
be calculated:
m
pump
h =
f
× B
L
f
The density, δ, of concrete is usually taken as 2,200
3
kg/m .
In installations where noise-less operation is
particularly important, we recommend a foundation
with a mass up to 5 times that of the pump. See also
8.6 Vibration damping on page 24.
can then
f,
× 1.5
× δ
f concrete
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