Particle Measurement in Gas System Components: Defining a Practical Test Method

  • Ulrich H. Koch
  • Michael C. Kovach


The objectives of this test program were to define a valid, practical test method to measure the cleanliness of process gas piping components and to illustrate the use of gas velocity as the basis for a cleanliness safety factor. Tests were conducted at three velocities using two particle counting methods, two valve designs, two cleaning methods, in both static and dynamic modes. A sufficient number of samples were tested to provide statistically valid results. The data show that high velocity flow tests are necessary to detect differences in high-purity cleaning methods and dynamic tests are required to evaluate valve designs. An industry standard test method for evaluation of systems and components is presented. Additional research is suggested to establish the critical velocity to remove particles of known size from a surface.


Safety Factor Dynamic Test Viscous Sublayer Cleaning Method Valve Design 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Ulrich H. Koch
    • 1
  • Michael C. Kovach
    • 1
  1. 1.Nupro CompanyWilloughbyUSA

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