Installation; Mechanical Installation; Vibration Dampers; Expansion Joints - Grundfos Hydro Multi-B Instrucciones De Instalación Y Funcionamiento

7. Installation

Warning
Installation and operation must comply with local
regulations and accepted codes of good practice.
Before installation, check the following:
• Does the booster system correspond to order?
• Are all visible parts intact?

7.1 Mechanical installation

7.1.1 Location
The booster system must be installed in a well ventilated room to
ensure sufficient cooling of the pumps and the control cabinet.
The booster system is not designed for outdoor
Caution
installation and must not be exposed to direct
sunlight.
The booster system must have a 1-metre clearance on all sides
for inspection and dismantling.
7.1.2 Pipework
The pipework connected to the booster system
Note
must be of adequate size.
Connect the pipes to the manifolds of the booster system.
Either end can be used. Apply sealing compound to the unused
end of the manifold, and fit the screw cap. For manifolds with
flanges, fit a blanking flange with gasket.
It is advisable to install pipe supports for the suction and
discharge pipes. See fig. 6.
To achieve optimum operation and minimise noise and vibration,
it may be necessary to consider vibration dampening of the
booster system.
Noise and vibration are generated by the rotations in the motor
and pump and by the flow in pipework and fittings. The effect on
the environment is subjective and depends on correct installation
and the state of the other parts of the system.
If booster systems are installed in blocks of flats or the first
consumer on the line is close to the booster system, it is
advisable to fit expansion joints on the suction and discharge
pipes to prevent vibration being transmitted through the pipework.
Example showing the position of expansion joints, pipe
Fig. 6
supports and mounting bolts
Pos. Description
1 Expansion joint
2 Pipe support
3 Mounting bolts
Expansion joints, pipe supports and mounting
Note
bolts shown in fig. 6 above are not supplied with
a standard booster system.
All nuts should be re-tightened prior to start-up.
The pipes must be fastened to parts of the building to ensure that
they cannot move or be twisted.
7.1.3 Foundation
The booster system should be positioned on an even and solid
surface, for instance a concrete floor or foundation. The booster
system must be bolted to the floor or foundation.
As a rule of thumb, the weight of a concrete
Note
foundation should be 1.5 x the weight of the
booster system.

7.1.4 Vibration dampers

To prevent the transmission of vibrations to buildings, it is
advisable to isolate the booster system foundation from building
parts by means of vibration dampers.
Which is the right damper varies from installation to installation,
and a wrong damper may increase the vibration level.
Vibration dampers should therefore be sized by the supplier of
vibration dampers. If the booster system is installed on a base
frame with vibration dampers, expansion joints should always be
fitted on the manifolds. This is important to prevent the booster
system from "hanging" in the pipework.

7.1.5 Expansion joints

Expansion joints are installed with the following purposes:
• to absorb expansions/contractions in the pipework caused by
changing liquid temperature
• to reduce mechanical strains in connection with pressure
surges in the pipework
• to isolate mechanical structure-borne noise in the pipework
(only rubber bellows expansion joints).
Expansion joints must not be installed to
Note
compensate for inaccuracies in the pipework
such as centre displacement of flanges.
Fit expansion joints at a distance of minimum 1 to 1 1/2 times the
nominal flange diameter from the manifold on the suction as well
as on the discharge side. This prevents the development of
turbulence in the expansion joints, resulting in better suction
conditions and a minimum pressure loss on the discharge side.
Examples of rubber bellows expansion joints without
Fig. 7
and with limit rods
Expansion joints with limit rods can be used to minimise the
forces caused by the expansion joints. Expansion joints with limit
rods are always recommended for flanges larger than DN 100.
The pipework should be anchored so that it does not stress the
expansion joints and the pump. Follow the supplier's instructions
and pass them on to advisers or pipe installers.
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