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Effect of the Radial Measurement Position on the Determination of Just-Suspended Speed Using Pressure Gauge Technology

Pressure gauge technology (PGT) is one of the promising methods to determine the just-suspended speed (Njs) because of its objectivity and adaptability. To identify the flexibility of PGT, the effect of radial measurement position on the determination of Njs was investigated for the first time. The results indicated that the difference between hydrostatic pressure changes measured at different positions was not significant and decreased with increasing impeller diameter and speed, and relative ranges of Njs with an impeller diameter of 0.35T (T represents tank diameter) and 0.53T were within 10.1 and 3.4%, respectively. Meanwhile, the Grubbs method showed no outlier at a confidence interval of 0.95 in measurements. Finally, the consistency was found between measurements from PGT and visual method with a maximum deviation of 18%. Therefore, the radial measurement position had a negligible effect on the determination of Njs, showing the good flexibility of PGT.