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Normalized Permeate Flow (NPF) - Reverse OsmosisAdvanced Reverse Osmosis TechnologyNormalized Permeate Flow - NFP is a calculation that allows the comparison of a measured permeate flow rate to a standard (or start up) condition. Permeate flow is a function of Net Driving Pressure (NDP), temperature and membrane condition. By normalizing measured permeate flow for observed NDP and temperature, a measure is obtained that can be used to compare the condition of the membrane to original start up conditions. A decrease in NPF of 10-15% indicates that membrane cleaning is required. For further information or assistance please contact Reverse Osmosis Chemicals International on +44 (0) 161 877 2334 or e-mail info@rochemicals.com.
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