Watson-Marlow SPS - Manual (Page 23)

MasoSine SPS sinusoidal pumps User Manual 23
l Align the pump shaft with the drive shaft.
12 Connection to the piping
Before connection, clean the piping and remove foreign bodies such as weld-
ing residues.
Fit elastic intermediate members (compensators) between pump and fixed
piping on the suction and pressure sides, to stop pump vibrations being
transmitted to the piping system.
Avoid forces and torques acting from the piping on the pump connections
(e.g. distortion, expansion due to temperatures etc.).
The piping on the pressure side of the pump should run upwards from the
pump, so that residual liquid can flow back into the pump when pumping
stops, and total dry running is avoided. Fluid left in the pump facilitates suc-
tion when pumping re-starts.
The user must ensure that a pressure rise above the pressure agreed in the
purchase order and listed in the technical data sheet is not possible.
MasoSine pumps normally run with such a low resonant frequency that no
damage results. However, particularly when running with inverters, certain
frequencies can cause inter ference vibrations which must be avoided. It is
important during commissioning to ascertain whether such vibrations exist
and to define them, so that the inverter can be programmed to avoid these frequen-
cies. Similarly, interference from cavitation or rigid lines must be avoided. See 12.1
Cavitation.
180°
7 3