Foundation; Anchoring; Positioning; Coupling Alignment - Wilo MMI50V Instrucciones De Instalación Y Funcionamiento

- Check that external pump parts, metals, paint and protecting cover
are compatible with the atmosphere around (saline atmosphere,
acid, corrosive or explosion proof).
- Make sure that base frame fastening bolts are correctly tightened
and blocked.
- Make sure that pump volute is totally immerged.
- A distance of 1,5 time the diameter of pump inlet should be set
between pit/tank bottom and suction flange.
7.1.1

FOUNDATION

Pump set can be installed on various types of foundations (on a concrete
ground, on a foundation concrete block, on a steel framework, ...). It is
the responsibility of the end user to select proper pump foundation
type. Noise level and vibrations transmitted by the machine depend on
the quality of foundation.
Following rules are general instructions that should be respected :
- Base frame or pump base plate should be fastened to a rigid
foundation with no risk of distortion while the pump is running.
- Surface under base plate should be horizontal, flat and should not
create any distortion of base plate after tightening of foundations
bolts. If surface quality is not sufficient, add shims between ground
and base plate.
7.1.2

ANCHORING

Pump matting flange will be fastened on its support only after discharge
flange has been connected without any stress to process discharge pipe.
Chemical anchoring device should be preferred to fasten a baseplate on
an existing foundation.
Anchor bolts can be used if foundation is to be built.
1 – Anchor bolt
2 – Baseplate
3 – Concrete foundation
Foundation bolts should be fully tightened only after the grout has
cured.
7.1.3

POSITIONING

Pump baseplate (cast iron base plate or fabricated steel baseframe)
should be installed horizontally to ensure bearings lifetime and proper
flow of pumped fluid.
7.1.4

COUPLING ALIGNMENT

Coupling alignment is not necessary when a flange mounted motor is
used. Both motor and pumps shaft are aligned by construction.

7.2 PIPE WORK

7.2.1

GENERAL INFORMATION

Pump connection flange is plugged to avoid any contamination during
transport and storage. This protective cover should be removed only
before installing the pump in the piping. Clean dust from the cover
before removing them from discharge flange. Especially for new pipe
works : clean thoroughly piping before connecting it to the pump.
- Remove protective cover
- Add flange gasket
- Fasten discharge pipe
No stress must be applied to the discharge pipe by the pipe work.
If excessive, those forces and moments may cause misalignment,
heating overheating of bearings, coupling wear, vibration and possible
failure or explosion of pump casing.
After replacement of a pump or during connection of pipes to
pump flanges, never use pump flange as a support to pull or push the
pipe works.
7.2.2

POSITIVE SUCTION HEAD CONDITION

Pump hydraulic part must always remain under lower fluid level.
7.2.3 SUCTION LIFT CONDITI ON
This type of pump is not able to start in suction lift condition.
EXTENSION PIPE :
The use of an extension pipe allows to end a pumping cycle in suction lift
condition. The connection between the pump and the pipe must be
sealed and not let air enter.
The lower end of the extension pipe must always remain
submerged, otherwise the pump unprimes. After the pump is stopped, it
is necessary to wait until liquid level is above the hydraulic.
Never allow the pump to operate in dry operation. If so, the
bearings will no longer be lubricated and a rapid wear of pump bearings
and shaft will occur followed by a rapid destruction.
7.2.4 ACCESSORIES AND PIPE S CONNECTION
STRAINER :
Except in case of vortex impeller, it is advised to use a strainer to avoid
bigger particles to go through the hydraulic. The size of the suction
strainer will be selected to ensure minimum pressure losses at pump
nominal flow.
NON-RETURN VALVE :
A check valve can be installed on discharge side to protect the pump
from back flow effects such as pressure surges or back flow when the
pump is stopped.
VALVES :
If a non-return valve is used, it is advised to install an isolating valve on
discharge side for maintenance purpose. This valve should be of large
passage type and could be locked in position.
AUXILIARY PIPES :
If pump must be equipped with auxiliary hydraulic equipments check
that there are no leakages and that direction of flow is respected in
auxiliary system.
After pipe work is done turn pump shaft by hand and check it turns
freely. If it appears that it is difficult to turn pump shaft, then check
forces applied by piping to pump casing. Installation of piping should be
done again.
ENGLISH
13