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Q4: [10] a) [06] An orifice plate is to be used in conjunction with a differential pressure transmitter to measure the flow rate of water in a 0.15 m diameter pipe. The maximum flowrate is 50 m3/hr. Estimate the required orifice plate hole diameter if the transmitter has an input range of 0 to 1.8 psi. Show calculations and state the reasons for your choice. b) [04] Calculate an actual corrected value for the differential pressure developed across the chosen orifice plate diameter, at maximum flow rate. Use following formula for the coefficient of discharge of orifice plate. 4 C = 0.99 – 0.023 106 + 0.002 = - 6) 'Red = where d = Orifice bore diameter and Red = Reynolds number referred to pipe diameter