An extensive series of measurements was carried out in the ANDRITZ in-house hydraulic laboratory (ASTRÖ) on a fully homologous model. These experiments provided performance data (flow rate, head, power, efficiency), cavitation observations, hydraulic forces (axial thrust, radial force, and momentum) and stability limits (e.g. pressure pulsations).
Compared with the old reference pump, the new design is characterized by a smaller size and by significantly higher blade loading, hence providing greater head and flow rate. Furthermore, the efficiency at the design point (OP1) could be improved.
Enhancement of Cavitational Limits:
Regarding cavitation, the NPSH required curve of the reference design had to be shifted to higher flow rates in order to avoid pressure side cavitation in start-up condition.
Finally, the new design fulfilled the fundamental condition NPSHplant ≥ NPSHrequired for the whole operating range and the measurements were completed with a successful acceptance test, witnessed by our customers.
In conclusion, the TURBOdesign1 considerably supported ANDRITZ Pumps in accelerating the hydraulic design process.