By Xu H.
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Additional resources for A backward stable hyperbolic QR factorization method for solving indefinite least squares problem
Fluorescent dye is injected at a known closely controlled rate into the suction or discharge of the pump being tested. Further done the system when thorough mixing has occurred, samples are drawn over about 20 minutes, and the concentration read using a fluorometer. A dye calibration curve is obtained with a water sample and different concentrations of die added. Only one pump can be run and tested at a time on multi-pump systems. 2 Measurement of the co-ordinates Measurement of the co-ordinates of free discharge outflow from a pipe is a rough method where approximate flows are required.
However, the annoying behaviour continued when the pump was returned to service. Figure 3,,6 Multistagepump In the investigation (which should have been done in the first place), the head was measured using the supplied tapping points in the pump flanges, and the flow found using an expedient method: a double tip pitot tube inserted through a gate valve, which was installed on the side of the 100mm diameter discharge pipe. 52 Predictive Maintenance of Pumps using Condition Monitoring The resulting points were consistent with the only available data: the works test curve.
7 Efficiency calculation As given in Chapter 2, the basic equation for pump performance is" QpgH P 48 Predictive Maintenance of Pumps using Condition Monitoring This can also be shown in a form showing common units as: Efficiency (decimal) - Flow (m3/s) x Density (kg/m 3) x g x Head (m) Power absorbed by pump (W) For boiler feed pumps, where flow is usually measured as mass flow and head given in pressure units: Efficiency (decimal) - Flow (kg/s) x Head (kPa) x 100 Power absorbed (kW) x Density (kg/m 3) Sometimes the term "wire-to-water" efficiency is seen.
A backward stable hyperbolic QR factorization method for solving indefinite least squares problem by Xu H.