Differential Pressure - Avista Membrane Treatment Solutions
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October 28, 2020

Differential Pressure

In reverse osmosis (RO) systems, the differential pressure is the pressure lost due to friction as water passes through the system. To determine the differential pressure, take a reading before the pressure vessels and after the pressure vessels of each stage, and this will inform you how much pressure was lost across that stage.

A very high concentrate flow rate will result in a high differential pressure due to the high friction. From a fouling perspective, scale, suspended solids, and biological growth build up in the feed channels and interfere with flow, thereby increasing friction and resulting in pressure losses.

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