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  • Users: djack77494
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  1. djack77494

    Brittle Failure of Vessels

    The most excellent (but now closed) thread, number thread135-145412 , contained a discussion about the depressurizing of a tank containing a liquified gas (CO2). In the thread, Mr. Montemayor presented a scenario in which a full depressurizing of a vessel caused the steel temperature to drop...
  2. djack77494

    Double Interpolation of Tabular Data

    In Excel, I have a table of data giving fluid densities (rho) with temperatures (T) and pressures (P) as parameters. In other words, my table looks like this: DENSITY vs. T,P P1 T1 Rho1,1 T2 Rho1,2 T3 Rho1,3 P2 T1 Rho2,1 T2 Rho2,2 T3 Rho2,3 etc. My problem is...
  3. djack77494

    NOx Emissions

    I believe that by convention NOx concentrations are reported as mg of NO2 per dry standard cubic meter or foot of flue gas. I also think this is reported "without dilution". Could someone confirm my very shaky understanding of this and clarify what without dilution means. Also, is there any...
  4. djack77494

    Operations & Design for FR Atmospheric Tanks

    I need some expert opinions regarding API650 floating roof tanks. My current project expects to buy a number of these tanks, but I see a few problems I'm unsure about. First, the design temperature is up to 230 degrees F, which I think exceeds API650 limitations. Obviously high temperature...
  5. djack77494

    Exactly when are PSV's needed?

    I need to move into some gray areas. We have a number of cases where we are flowing through multiple (large) heat exchangers and then into a vessel. I would consider the exchangers to be pressure vessels since they don't meet the exclusion criteria. Some of these circuits are quite complex...
  6. djack77494

    Heat Exchanger Design-Choice fo TEMA type

    I (think that I) understand the factors involved in selecting which side of an exchanger to put the two fluids, and I know the limitation due to thermal expansion of fixed tube design. But that leaves choices between expansion joints, floating heads, and U-Tube designs when temperature...

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