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Determine the Service and Backwash Rates
The system on site is a pressure sand filter, with a service curve. The filter is backwashed using the feed pump, at a higher flow rate, shown as backwash curve.
Service duty point: 3 m3/h
Backwash duty point: 9 m3/h
Part (a)
What is the speed of the pump to achieve the service and backwash flow rates ?
Part (b)
What would be the best way to control the speed of the pump ? Why ?
Part (C)
The pump is set up as a fixed speed constant pressure system (pump runs once system pressure reaches 550 kPa, turns off, when pressure drops to 450 kPa plant re-starts) to maintain a system pressure of 500 kPa at the discharge of the pump. What would be the service and backwash rates from the pump ?
The field winding of a 200 V d.c. machine has a resistance of 20? and an inductance of 500mH. Calculate: (a) The time constant of the field winding (b) The value of curr
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