Watson-Marlow 720DuN User Manual 81
28 720R, 720RX, 720RE, 720REX,
pumphead installation
The 720 pumphead’s method of connection to the 720 drive is different from the
701’s. The two pumpheads are not interchangeable.
28.1 Pumphead do’s and do not’s
A correctly engineered installation will promote the best possible tube life, so please
ensure that the following guidelines are followed:
Do site the fluid reservoir above the pump wherever possible.
Do keep delivery and suction lines as short and direct as possible.
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 (720R/720RX only) to allow its posi-
tion 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, do install a drop out
section of pipe work to simplify tube replacement.
Do keep the pumphead rollers and track clean and free of grease.
If unsure of an installation please contact your local Watson-Marlow Technical
Support Office for further assistance.
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