Pump curves of clear water were measured before and after each sand test to investigate the wear which will be taken into account in data processing. Back to top Results and Analysis, Head Ratio. Head ratio versus delivered volumetric concentration. The head ratio H r versus delivered volumetric concentration C vd for the three solids is plotted on Fig. 3. As expected, solids concentration and size demonstrate a prevailing influence on pump characteristics.
H m drops faster.
3 also revels that the data scatter around the correlation lines and the coarse sand displays a larger scatter. Dependence of head ratio on flow rate and rotary speed. That is to say, delivered volumetric concentration C vd and sand size d affect the fractional head reduction in pumps in the same fashion as they influence the solids effect in pipelines. According to the test plan, the I m -V m curve of the hydraulic gradient I m , defined as head loss in meter water over one meter pipe, versus mean slurry velocity V m in the horizontal pipe for each concentration was measured first and then the pump performance test was carried out. It is unlikely a coincidence.