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Micron Vs Ppm

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#1 muchlis nugroho

muchlis nugroho

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Posted 25 April 2007 - 11:05 PM

Dear All,

Many literature of equipment sizing to remove oil in water (produce water treatment) use stokes law (Gravity Setling, CPI Separator, etc). The calculation basis is the droplet size (in micron). But the actual design requirement is the final oil content (in ppm).
How to translate ppm requirement to droplet size? Do we have to make laboratory test to make corelation of micron vs ppm? Or Has somebody simplified it in an equation/table/diagram?


#2 Technocrat


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Posted 13 June 2007 - 09:21 AM

Hi Much,

Any vendor supplying coalescers will not guarantee the performance on absolute basis (ppm) but on size basis (micron) because the particle size distribution is generally unknown. The client has to determine the particle size distribution in the inlet liquid and supply to the vendor. The vendor then calculates the particle size distribution at the outlet of the coalescer and convert to absolute terms (ppm) by mass balance.


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