Cavitation destroys the pump, Caution – Watson-Marlow EC 25 User Manual
Page 10
Revision 4.4 / November 2010
10
8
Installation
The motor shaft and pump shaft connection
must be protected against contact!
Place the pump on a level ground.
Do not start without the protection against contact!!
The foundation should be dimensioned sufficiently for the weight of the pump.
There should be sufficient space for maintenance work around the pump.
It must be guaranteed that the motor receives an adequate air supply.
If the pump is used in explosion endangered rooms, an Ex protected motor must be
used.
The total unit must be protected against static charge.
Align the shaft of the pump with the shaft of the drive.
9
Connection to the piping
Before connection clean the piping and remove foreign bodies.
(e.g. there can still be residues in the pipes due to welding work).
Fit elastic intermediate members (compensators) between pump and fixed piping on the suction
and pressure side. This should prevent vibrations of the pump being transmitted to the piping
system.
Forces and torques acting from the piping on the pump connections (e.g. due to distortion,
expansion due to temperatures etc.) must be avoided.
The pressure line should point upwards, so that later residual liquid can always flow back into the
pump. Thus total dry running is avoided. Further it facilitates the later suction process.
The operator has to ensure that an inadmissible pressure rise (above the pressure agreed in the
order and listed in the technical data) is not possible.
The SINUS pumps normally run with such a low resonant frequency that no corresponding
damage is caused. However, particularly when running with converters, certain frequencies can
cause interfering vibrations which must be avoided. It is important during initial commissioning to
ascertain whether such vibrations exist and to define them accordingly, so that the frequency
converter can then be programmed to avoid these frequencies. Similarly, interference from
cavitation or rigid lines must be ruled out.
10 Possible connection positions
Counterclockwise rotation of the rotor and motor Clockwise rotation of the rotor and motor
Unless otherwise ordered, the pump is delivered in 10-2 position.
C
C
A
A
U
U
T
T
I
I
O
O
N
N
C
C
A
A
U
U
T
T
I
I
O
O
N
N
C
C
A
A
U
U
T
T
I
I
O
O
N
N
C
C
A
A
U
U
T
T
I
I
O
O
N
N
C
C
A
A
U
U
T
T
I
I
O
O
N
N
C
C
A
A
U
U
T
T
I
I
O
O
N
N
DO NOT LET RUN THE PUMP
WITHOUT COUPLING GUARD!
CAUTION!
The operator has to ensure that the pump can work free of cavitation!
Cavitation destroys the pump!