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Water at 20°C is transported from the reservoir to the elevated tank, using seamless carbon steel pipes with a diameter of φ133×4 for the transmission pipelines. The characteristic parameters of the centrifugal pump used are shown in the table below ； Flow rate (m3/hr): 70, 90, 109, 120. Head (m): 59.0, 54.2, 47.8, 43.0. Efficiency (%): 64.5, 69, 69, 66. Allowable suction vacuum level (m): 6.0, 5.5, 4.8, 4.5. A V500 series equal percentage flow globe valve is installed at the pump outlet to regulate the flow rate. Calculate the following values: 1) Maximum flow rate (m3/hr) and the corresponding shaft power. 2) Flow rate and corresponding shaft power when the valve opening is 20%.
It is recommended to refer to the Chemical Engineering Principles section of the basic exam for registered chemical engineers, as there are similar example questions!