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  • Users: gsxra
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  1. gsxra

    ISA/IEC sizing question

    fwcatr, Help me out. Knowing the formula is C=W/(N6*Y*[x*p1*rho1]^.5) Y=1-(x/(3FkxT)), x=DP/P1, N6=63.3 Known: W, N6, Fk, xT, P1. rho1, C This leaves DP the only variable I don't have. But I don't remember my algebra that well to solve for DP. When I solve for DP I get: DP^3/(3*Fk*xT*P1)^2 -...
  2. gsxra

    ISA/IEC sizing question

    I am setting up a model in MS Excel that represents pressure loss through components such as pipe, elbows, block valve, control valve. This is used to determine the design conditions for a startup vent for steam service. As for the type of control valves: I have used Fisher, Masoneilan...
  3. gsxra

    Ball valve standards

    Check out ASME B16.34 or ISA S75.04
  4. gsxra

    Seat leakage classes

    When it comes to ball valves, yes manufactures can and will specific their leakage class as III, IV, V, etc. Some manufacturers will state they are bubble tight. You need to read there test proceedure on how they determine bubble tight thou. Hope this helps.
  5. gsxra

    ISA/IEC sizing question

    Jim, But you still need to break Y out (because Y=1-X/(3FkxT)). When I do that I get a cubic equation for DP. If you use your equation or the ISA one I listed same result. I was hoping someone had the equation solved for me. Thanks
  6. gsxra

    ISA/IEC sizing question

    I have the equation but I do not know the downstream pressure. I need the equation reworked to solve for delta P. The equation I have is C=W/(N6*Y*{x*p1*rho1)^.5) Y=1/(3FkxT), x=DP/P1
  7. gsxra

    VALVE MATERIAL for Demineralized WATER

    As for demineralized water I would use SA-351-CF8M (316SS), ANSI 600. For conditions given you are saturated water so I don't know what mat'l and pressure class to recommend for SH steam. As for what type of gate valve, there are many manufacturers but I have had alot of sucess with HP...
  8. gsxra

    ISA/IEC sizing question

    I am looking for the equation for delta P across a control valve. I am looking for non-choked, compressible, turbulent flow with or without fittings attached. I have the equation to solve for C, but I was hoping someone has this equation re-worked for DP. Thanks Josh

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