Mechanical Installation; Pump Location; Foundation And Grouting Of Horizontally Mounted Nk, Nkg Pumps With Base Frame - Grundfos NK Serie Montage- Und Betriebsanleitung

7. Mechanical installation

7.1 Pump location

The pump must be sited in a well-ventilated, but frost-free
location.
Warning
When pumping hot or cold liquids, make sure that
persons cannot accidentally come into contact with
hot or cold surfaces.
For inspection and repair, allow suitable clearances for pump or
motor removal.
• Pumps fitted with motors up to and including 4 kW require a
0.3 m clearance behind the motor.
• Pumps fitted with motors of 5.5 kW and up require a 0.3 m
clearance behind the motor and at least a 1 m clearance
above the motor to allow the use of lifting equipment.
0.25 - 4 kW
5.5 kW and up
1 m
Fig. 7 Clearance behind the motor
7.2 Foundation and grouting of horizontally mounted
NK, NKG pumps with base frame
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 1.5 times
the weight of the pump.
The foundation must be 100 mm larger than the base frame on all
four sides. See fig. 8.
Fig. 8 Foundation, X equal to minimum 100 mm
12
0.3 m
0.3 m
The minimum height of the foundation, h
× 1.5
m
pump
h =
f
× B × δ
L
f f
The density, δ, of concrete is usually taken as 2,200 kg/m
Place the pump on the foundation, and fasten it. The base frame
must be supported under its entire area. See fig. 9.
Fig. 9 Correct foundation
Fig. 10 Incorrect foundation
Fig. 11 Base frame with pouring holes
It is important to prepare a good foundation prior to the
installation of the pump.
NK, NKG pumps with base frame are always prepared for
grouting.
For NK, NKG 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
equal to 45 kW
2-pole Grouting optional
4-pole
6-pole
, can then be calculated:
f
concrete
3
.
P2 equal to or higher
than 55 kW
Grouting mandatory
Grouting optional
Grouting optional