Watson-Marlow 701 - Manual (Page 13)

16 701RB, 701RBX, 701RBG, 701RBE, 701RBEX
Pump installation
A correctly engineered installation will promote the best possible tube life, so please ensure
that the following guidelines are followed:
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.
All performance figures in this operating instruction relate to peak pipeline pressures. Peak
pressure is not always accurately shown by oil-filled analogue pressure gauges as damping
of the gauge needle occurs. The pressure being recorded using an analogue gauge may
only be 75% of true peak pressure. For accurate peak pressure measurement a digital
pressure transducer should be used.
Page 13 of 25 Watson-Marlow Bredel E-Manuals
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