Hello,  Mr Sundance Rogers, Mr Steven Johnson. The data available from manufacturer of PF is as follows : Operating Pressure = 5 kg/ cm2 Flow rate = 105  m3/hour Media = Zeosorb( Germany)   The website provides this info: www.watchwater.com/pdf/suspended-solids-tss/zeosorb... ----------------------------------------------------------------- Operation conditions and exchange capacity: Bed depth 400 - 1000 mm Freeboard 30 - 50 % Service flow rate 20 - 48 m/h Back wash flow rate 25 - 50 m/h ----------------------------------------------------------------- Diameter of pressure vessel = 2400 mm (as per mfg) (How is this arrived ? ) Height = 2000 mm Material of PF is Carbon steel. To Filter untreated drinking water of 15 NTU at inlet to PF. Temperature of Water = 20 deg C ------------------------------------------------------------- I have to choose a suitable pump for back washing, for which I need to first arrive at correct back wash flow required.  Also, I want to know how much residual pressure remains at the drain outlet after backwashing, so that the residual head can be used for further flow by gravity. What could be the head loss after back washing ? Where can I find a scientific method of " How to design a PF" ? Sandeep

Published August 16, 2017 05:37 by Sandeep Pandharkar, Consultant for Engineering, Procurement & Construction for Water & Wind projects