Watson-Marlow Qdos30 - Manual (Page 14)

Watson-Marlow qdos30 PROFIBUS Pump User Manual 14
8.2 Do’s and do not’s
Do not build a pump into a tight location without adequate airflow around the pump.
Do keep delivery and suction tubes as short and direct as possible - though ideally
not shorter than one metre - and follow the straightest route. Use bends of large
radius: at least four times the tubing diameter. Ensure that connecting pipework
and fittings are suitably rated to handle the predicted pipeline pressure. Avoid pipe
reducers and lengths of smaller bore tubing than the pumphead section, particularly
in pipelines on the suction side. Any valves in the pipeline must not restrict the flow.
Any valves in the flow line must be open when the pump is running.
Do use suction and delivery pipes equal to or larger than 6.4mm diameter bore.
When pumping viscous fluids use pipe runs with a bore several times larger than the
pump tube.
Do site the pump at or just below the level of the fluid to be pumped if possible. This
will ensure flooded suction and maximum pumping efficiency.
Do run at slow speed when pumping viscous fluids. Flooded suction will enhance
pumping performance, particularly for materials of a viscous nature.
Do recalibrate after changing pumphead, fluid, or any connecting pipework. It is also
recommended that the pump is recalibrated periodically to maintain accuracy.
Do ensure your PROFIBUS pump is installed in accordance with PROFIBUS installation
guidelines.
Do not pump any chemical not compatible with the pumphead.
Do not tilt the drive with a pumphead fitted, even if it is not running.
Do not strap the control and mains cable together.
Do avoid tight bends in the PROFIBUS signal cable.
Pressure capability
qdos30 can be operated continuously at discharge pressures of up to 7 bar (100 psi).
The pump can be operated at discharge pressures of up to 10 bar (145 psi), however
flowrate and pumphead life will be affected.
Dry running
qdos30 will continue to operate when there is gas present in the suction line and will
maintain prime in these conditions. The pump can be run dry, however flowrate and
pumphead life will be affected.