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  1. Re: Common mistakes in process design/simulation

    Invaluable information. Much appreciated. Thanks


    See More: Common mistakes in process design/simulation

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  3. Re: Common mistakes in process design/simulation

    hi

    I had problem in the pipe phase software. when I simulating the natural gas at 715 psi and 66 deg C in the transmission line, my velocity is gradually reducing , normally as per ideal law of gas the actual volume of gas should be increase due to reduction in pressure loss. when I doing the same model with natural gas at 300 psi and 66 deg c the velocity is gradually reducing in the line due to friction loss. I am not able understand this behavior in the software, ca any one explain the solution to overcome this situation.
    with regards
    sathish kumar

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  5. Re: Common mistakes in process design/simulation

    hi

    I had problem in the pipe phase software. when I simulating the natural gas at 715 psi and 66 deg C in the transmission line, my velocity is gradually reducing , normally as per ideal law of gas the actual volume of gas should be increase due to reduction in pressure loss. when I doing the same model with natural gas at 300 psi and 66 deg c the velocity is gradually reducing in the line due to friction loss. I am not able understand this behavior in the software, ca any one explain the solution to overcome this situation.
    with regards
    sathish kumar

    My threads; sathish_che :


  6. #40

    Re: Common mistakes in process design/simulation

    Remember that any expansion of a gas normally entails a temperature reduction, at least heat transfer with the surroundings is fast enough to hold constant temperature.

  7. Re: Common mistakes in process design/simulation

    Much appreciated. Thanks

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  9. #42

    Re: Common mistakes in process design/simulation

    The conversion from SCFM to ACFM can be expressed as

    ACFM = SCFM [Pstd / (Pact - Psat Φ)](Tact / Tstd) (1)

    where

    ACFM = Actual Cubic Feet per Minute

    SCFM = Standard Cubic Feet per Minute

    Pstd = Standard absolute air pressure (psia)

    Pact = absolute pressure at the actual level (psia)

    Psat = Saturation pressure at the actual temperature (psi)

    Φ = Actual relative humidity

    Tact = Actual ambient air temperature (oR)

    Tstd = Standard temperature (oR)


    Correct ?

    My threads; wyb :


    • Re: Common mistakes in process design/simulation

      Actual to standard volumes can be calculated using the Combined Gas Law:

      P1.V1/z1.T1 = P2.V2/z2.T2

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      • #44

      • Re: Common mistakes in process design/simulation

        In my exper., gas compt until c7+ is enough for eq. Sizing but for flow assurance & compre. Will give another concern

      • Re: Common mistakes in process design/simulation

        Yes, Agree.,
        special for Air as fluid since AIr has humidity factor that will affect the ACFM.

        Quote Originally Posted by wyb View Post
        The conversion from SCFM to ACFM can be expressed as

        ACFM = SCFM [Pstd / (Pact - Psat خ¦)](Tact / Tstd) (1)

        where

        ACFM = Actual Cubic Feet per Minute

        SCFM = Standard Cubic Feet per Minute

        Pstd = Standard absolute air pressure (psia)

        Pact = absolute pressure at the actual level (psia)

        Psat = Saturation pressure at the actual temperature (psi)

        خ¦ = Actual relative humidity

        Tact = Actual ambient air temperature (oR)

        Tstd = Standard temperature (oR)


        Correct ?

      • Re: Common mistakes in process design/simulation

        Thanks bro mohamedellejmi for these useful information..

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        • #48

          Re: Common mistakes in process design/simulation

          Thanks for the info! I would like to share one more common mistake in simulation i.e Over specifying the simulation. It is the hardest one to identify.. Do not make the full flow sheet at once and then start converging unit operation one by one until you are quite familiar with the whole process. Instead of that make flow sheet bit by bit and make it converge step by step and proceed.

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