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Comment PDF Separation Processes

Liquid-Gas Coalescers: Demystifying Performance Ratings

By Thomas H. Wines, Scott Whitney and Ali Arshad, Pall Corp. |

Engineers working in the chemical process industries (CPI) sometimes have to deal with aerosol contamination issues in which liquid-gas coalescers are routinely employed. For example, liquid-gas coalescers are used to protect compressors, liquid-gas contactors, turbines, low-NOx burners, metering and instrumentation stations, and for many other applications. Choosing the right coalescer type can be a confusing task as many of the equipment-supplier claims can be difficult to understand without more background information on how the products are rated. This article supplies this information and explains how the commonly used rating procedures can affect the performance claims output. For evaluating a coalescer efficiency rating, it is important to have the test procedure specified and consider the different test options, as they will affect the rating. Furthermore, the same coalescer can give different performance ratings depending on the test method used. This article compares the different test methods commonly used to rate liquid-gas coalescers, including the DOP [1], sodium chloride [2], ANSI/CAGI [3] and the liquid aerosol separation efficiency (LASE) test [4]. A review of how vertical liquid-gas coalescers operate is also presented,…
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