Foundation Of Nb, Nbg Pump Without Base Frame; Foundation Of Nb, Nbg Pump With Base Frame - Grundfos NB Original Installation And Operating Instructions

7.4 Foundation of NB, NBG pump without base frame

The foundation/installation must be carried out in
accordance with the following instructions. Non-
Caution
compliance may result in functional faults which
will damage the pump components!
We recommend that you install the pump on a concrete
foundation which is heavy enough to provide permanent and rigid
support to 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 concrete foundation must have an
absolutely level and even surface.
Place the pump on the foundation, and fasten it. See fig. 11.
Fig. 11 Foundation
The foundation length and width should always be 200 mm larger
than the length and width of the pump. See fig. 11.
The mass of the foundation must be at least 1.5 times the total
mass of the pump. The minimum height of the foundation (h
then be calculated:
×
m 1.5
pump
h = ------------------------------------------- -
f × × δ
L B
f f concrete
The density (δ) of concrete is usually taken as 2,200 kg/m
In installations where noise-less operation is particularly
important, a foundation with a mass up to 5 times that of the
pump is recommended. See also 7.7 Vibration dampening.
16

7.5 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 pump weight.
The foundation should be 100 mm larger than the base frame on
all four sides. See fig. 12.
Fig. 12 Foundation, X = min. 100 mm
The minimum height of the foundation (h
h
f
The density (δ) of concrete is usually taken as 2,200 kg/m
) can
f
Place the pump on the foundation, and fasten it. The base frame
must be supported under its entire area. See fig. 13.
3
.
Fig. 13 Correct foundation
) can then be calculated:
f
×
m 1.5
pump
= ------------------------------------------- -
× × δ
L B
f f concrete
3
.