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  1. supermax

    Particular safety valve calculation

    Hello to everyone, it seems that I post only to solve my troubles, but... I hope I will give soon my feed back! Well, I have to size a pressure safety valve installed downstream an furnace, in wich occurs a partial vaporization of an hydrocarbons mixture. The calculation hypothesis is: outlet...
  2. supermax

    API RP 14J for safety valves inlet/outlet sizing

    Thank you Guidoo, I found useful your suggestions about the codes... I just can add this note: there is a specific API guideline, that is API RP 526, in which are stated both stadard orifice areas/diameters and inlet/outlet safety valve connections. So, I think that you guessed right about the...
  3. supermax

    API RP 14J for safety valves inlet/outlet sizing

    Hi, I have to size a pressure safety vale for an off-shore platform skid, and reading a technical clarification by client I found this specification: "the PSV inlet and outlet shall be sized as per API 14J requirement". What does it mean? Usually I apply the API RP 520 code for safety valve...
  4. supermax

    HYSYS Visual Basic

    Hi, another question: I have to calculate the release flow rate of a relief valve on a diesel oil storage tank, using the external fire case condition; the set pressure of the valve is 0,35 barg and the tank is pressurized with natural gas. I'm not able to find the entalpy of vaporization for...
  5. supermax

    Flame arrestor on blow down line

    Hi, I have to install a flame arrestor on a blowdown line: someone knows if there is an API statement or another technical reference that prevent it? It depends only on pressure drop evaluation? Thank you.
  6. supermax

    Natural gas electric (indirect) heater

    Thank you PremP, but I can't choose a different heater because of the supply specifications that the client gave me. Thanks to all of you for your answers.
  7. supermax

    Natural gas electric (indirect) heater

    I have to design a very unusual natural gas heater for a sea platform skid, that shall be structured in this way: - A jacketed vertical vessel with dyatermic oil inside, heated by an electric resistance, provided by a on-off device; - A natural gas flux trough the jacket, where the gas has to...
  8. supermax

    liquid mixtures freezing point

    Hello, I know that somewhere there are freezing point tables of various water liquid mixtures (eg.: water-glycol, water-ethanol) at different compositions: can someone tell me where is possible to find theese informations (books, articles, etc.)? Thank you.
  9. supermax

    Depressuring systems

    I use HYSYS 2.2 for my symulations, but I'm not licenced to operate in the dynamic mode; however, Hysys is a very expensive sym software! Do you know another sym software less expensive than Hysys? Thank you.
  10. supermax

    Depressuring systems

    Thank you svv, but I have to tell you that I actually use Hysys! I know the feature you were talking about and I used it. The problem is that I can't understand the applied method: the heat transfer problem that Hysys solves refers to an external fire case (the mathematical model used by Hysys...
  11. supermax

    Depressuring systems

    Thank you for your answers; the final pressure wasn't the atmospheric pressure, but this is a value that I posted for istance. I think the problems depends on: 1) The vessel mass 2) The vessel wall thickness 3) The thermal conductivity and the specific heat of the wall material 3) The...
  12. supermax

    Depressuring systems

    Hello, I have a gas depressuring system in wich a pressure vessel has to be depressurized from about 29 bar to environmental pressure, using a pressure relief valve. This is the question and I wonder if you could help me: do you know a mathematical model that is able to tell me what is the...

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