• We are planning to upgrade the NHT feed LL coalescer from PP wools to cartridges. How do we check the free water at the naphtha outlet coalescer to ensure the performance meets the spec? Is there any standard method to check free water in naphtha?



  • Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com

    You can do a simplified version of ASTM D-4007, which is the BS&W test commonly used for crude oil. Because of the nature of naphtha vs. Crude, you should not need to dilute the sample with toluene, nor should you need a heated centrifuge. It should be a very straightforward test.  You could also do Karl Fisher water, which would also include dissolved water.



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