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  1. beaver_01

    Valve Body to Valve Shaft Diameter Ratio

    Thank you everyone for your response!
  2. beaver_01

    [HAC question] Can we use density at operating condition using IEC 60079-10-1?

    Hi all, (Problem) Density drop significantly from operating condition to ambient condition for town gas (50mol% H2, 50mol% hydrocarbons). This result in a large very large zone distance (Zone 1, 9m) if used the calculation method in IEC 60079-10-1 (using density at ambient condition). The...
  3. beaver_01

    Hazardous Area Classification (HAC) for Pressure Relief Valve

    Hi all, Should pressure relief valve be considered as primary or secondary grade of release in IEC 60079-10-1? Section B.2.3(d) and B.2.4(d) said that relief valves can be primary or secondary depending on whether they are expected to lift during normal operation or not. My understanding is...
  4. beaver_01

    Valve Body to Valve Shaft Diameter Ratio

    Hi, I am looking for the average valve shaft diameters for different valve sizes. For example, for a 6-in valve, what is the typical shaft diameter. Are there any reference documents for it? Thanks!

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