7.2
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 with the largest diameter bore tube that will fit with
your process, especially when pumping viscous product. Care should be taken when
pumping solids in suspension as large bore tubes will reduce the fluid velocity, this may
lead to solids dropping out of suspension.
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.
7.3
Pressure capability
qdos120 can be operated continuously at discharge pressures of up to 4 bar (60psi)
qdos20, qdos30 and qdos60 can be operated continuously at discharge pressures of up to 7
bar (100psi).
qdos30 can be operated at discharge pressures of up to 10 bar (145 psi), however flowrate
and pumphead life will be affected.
7.4
Dry running
qdos 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 flow rate and
pumphead life will be affected.
m-qdos-en-02
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