When Should you Clean

HOW TO DETERMINE WHEN

TO CLEAN YOUR MEMBRANES

Although there are Flow Normalization calculations that are based on projected membrane performance data, system design or operational modifications can hinder the accuracy of these calculations. In order to simplify the calculation and to track your system’s actual performance, this calculation will help to determine present membrane performance vs. performance at start-up. If the calculation determines that Normalized Flow has declined by 10% or more, it is time to schedule a cleaning for the membranes.

The readings that will be used as "Start-Up" data for the calculation should be taken and logged for reference after the system has operated for 24 to 48 hours from the time of initial start-up or start-up of newly loaded membranes.

Temperature Compensation Factor and Pressure Compensation Factor

Temperature Compensation Factor: Look up this factor on the Table that is provided on the table below

Pressure Compensation Factor: You calculate the PCF by dividing Start-Up Feed Pressure by the Present Feed Pressure reading (Start-Up PSI/Present PSI). (Example: If Start-up Feed Pressure was 230 psi and the Present Feed Pressure is 250 psi, the calculation would be 230/250 = 0.92 Pressure Compensation Factor)

Information Required:

TEMPERATURE CORRECTION FACTOR TABLE