Watson-Marlow 701 - Manual (Page 7)

6 Recommended operating procedures
On variable speed models please note that the mechanical speed variator must not be
adjusted when the motor is not running.
Do site the fluid reservoir above the pump wherever possible.
Do keep delivery and suction lines as short and direct as possible.
Do use gradual sweeping bends in installation pipe work with minimum radius equal to five
times the tubing diameter. Avoid tight pipeline bends, pipe reducers and excessive lengths
of smaller bore tubing than that in the pumphead, particularly in pipelines on the suction
side.
Do ensure that there is always a minimum of one metre of smooth bore flexible tubing
connected to the discharge port of the pumphead. This will help minimise any impulse
losses and pulsation in the pipeline. This is especially important with viscous fluids and rigid
pipework.
Do use suction and delivery pipelines with a bore equal to or larger than the bore of the
tube fitted in the pumphead. When pumping viscous fluids, the losses caused by increased
friction can be overcome by using pipe runs with a cross sectional area several times
greater than the pumping element.
Do fit an over-length pump tube in the system to allow its position to be varied relative to
the rotor. This will extend tube life and minimise the downtime of the pumping circuit.
Do ensure that connecting pipe work and fittings are suitably rated to handle the predicted
pipeline pressure.
If rigid pipe work comes in close proximity to the pumphead, a drop out section of pipe
work will simplify tube replacement.
Do keep the pumphead rollers and track clean.
If unsure of an installation please contact your local Watson-Marlow Technical Support
Office for further assistance.
The self-priming nature of peristaltic pumps means valves are not required. Any valves
fitted must cause no restriction to flow in the pumping circuit.
Tube selection. The chemical compatibility list published in the Watson-Marlow catalogue is
only a guide. If in doubt about the compatibility of a tube material and the duty fluid,
request a tube sample card for immersion trials.
Fundamental work with regard to lifting, transportation,
installation, starting-up, maintenance and repair should be
performed by qualified personnel only. Make absolutely sure
that no voltage is applied at all while work is being carried
out on the geared motor. The motor must be secured against
accidental start up.
Page 7 of 25 Watson-Marlow Bredel E-Manuals
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