The system on site is a pressure sand filter, with a service curve. The filter i

Question

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.

What is the speed of the pump to achieve the service and backwash flow rates ? Please explain your answer thoroughly

What would be the best way to control the speed of the pump ? Why ?

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 ?

Explanation / Answer

the best way is when pressure drops to 450 kPa plant re-starts) to maintain a system pressure of 500 kPa at the discharge of the pump . Speed of the pump varies from time to time .on an average of 13 km/sec.

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