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  1. Casimo5

    How to model Dissolved O2 in Water using Hysys

    I would like to model the amount of dissolved oxygen (DO) in water for the purpose of simulating a deoxygenation vacuum tower. Can anyone tell me what the best fluid package to use for this?
  2. Casimo5

    Nitrogen for Removal of Oxygen from Water

    Have you looked at this process... http://www.grenlandgroup.com/minoxtm-deoxygenation-system/category365.html Speaking with a rep from Grenland, I was told that 1:1 volume ration of N2 to Water will strip O2 down to 20 ppb or less. Not sure if it was a 1:1 volume ratio at operating conditions...
  3. Casimo5

    PSV Superimposed Back Pressure

    Is there any type of purge or continuous flow through the flare system? That would be one place to start.
  4. Casimo5

    relief valve set pressure Q

    @ Jefka I agree. It makes more sense to place the relief valve at the front end, closer to the source of the overpressure in the example I gave. I was just giving an example of when you would set the PSV set pressure below the MAWP. If the relief valve is placed at the front end, then you...
  5. Casimo5

    relief valve set pressure Q

    To expand on Jefka's example, if you have a string of equipment with the same MAWP (no rotating equipment or block valves in between them) and a single relief valve protecting all of them after the last piece of equipment (as is the case in some gas plants), you may want to set the relief valve...
  6. Casimo5

    Blocked In Exchanger Boil-Off Rate

    In the case of an gas/liquid exchanger where the gas is the hot fluid and is on the tube side, and water is the cold fluid on the shell side, I am trying to calculate the relief rate when the water side is blocked in and the gas is still flowing. The gas is at a temperature where I would expect...
  7. Casimo5

    Distance between rupture disc and PSV

    laliyo, Are you considering using a rupture disk in place of the blinds that are on the vapor line of the exchanger whose shell side is not in service so that in the event of a ruptured tube, the shell side would then be open to the relief path to the PSV? The problem with relieving from one...
  8. Casimo5

    Post from another section on PSV selection for PD pumps

    cannondale, Regarding your set pressure/operating pressure, API 520 Part 1 shows the maximum expected operating pressure at 90% of your set pressure. Typically if you operate above 90% of your set pressure, you want to use a pilot operated valve to avoid leaking by. Your max working pressure...
  9. Casimo5

    WHB Tube Rupture, possible 2-phase flow at PSV?

    I realize now that in my original post I am comparing a vapor relief to a two phase relief, where in my response to CMA010 I am comparing one two phase relief to another. When you compare the two-phase relief cases you get 4 times the area for 4 times the mass flow. When you compare a single...
  10. Casimo5

    WHB Tube Rupture, possible 2-phase flow at PSV?

    CMA010, I'm sorry, I must not be explaining the scenario clearly enough. The 1% volumetric flow is referring to the liquid phase of the two phase flow. We have 14,000 m3/h of flow, of that only 140 m3/h is liquid and 13,860 m3/h is vapor. Lots of vapor, very little liquid...VOLUME. Now...
  11. Casimo5

    WHB Tube Rupture, possible 2-phase flow at PSV?

    Thanks CJKruger, that's they type of confirmation that I'm looking for. Unfortunately there is no equipment between the exchanger and the PSV, but there is a significant amount of 20" pipe. The scenario is actually quite a bit more complicated, but not relevant here. I'm comfortable with my...
  12. Casimo5

    WHB Tube Rupture, possible 2-phase flow at PSV?

    I have a case where the high pressure side is BFW, on the shell, and flue gas in the tubes (low pressure side). If there is a tube rupture, high pressure BFW will go to the low pressure side and flash across the rupture. Using Hysys simulation, I calculated the percent flashing that occurs...
  13. Casimo5

    Atmospheric Storage Drum Vent/Overflow

    Thanks for all the input guys. A lot of good points. In my case, the storage vessel is a horizontal drum that is actually rated for 50 psi and will get a code stamp, however it will be classified as an atmospheric storage drum because that's all that is required for it. It is in 10% caustic...
  14. Casimo5

    Atmospheric Storage Drum Vent/Overflow

    Yes, I meant a horizontal drum, not a cone roof tank. Thanks for the input! I'm sure as soon as we make this change, the client will request that we use separate nozzles for vent and overflow!
  15. Casimo5

    Atmospheric Storage Drum Vent/Overflow

    I have designed an atmospheric storage drum with a vent and a separate overflow line. The client has requested that the vent and overflow lines be combined into a single nozzle. We currently do not have an argument against this arrangement other than the cost of the engineering hours to modify...
  16. Casimo5

    Purge rate during volume change

    What is the maximum operating pressure of the vessel? I'm not sure I fully understand your process. Are you saying that you fill the vessel and start fermentation, which generates CO2 which mixes with the air that is already in the vessel, then you want to purge the vessel of that CO2/air...
  17. Casimo5

    Mounded Storage Application

    Thanks Compositepro! I just needed to see where it was documented somewhere that having a mounded storage relaxed spacing standards in any way. From NFPA 59A, Section 13.6, it looks like above ground and mounded storage are treated the same way as far as spacing goes. It looks like you need...
  18. Casimo5

    Mounded Storage Application

    I am trying to find information on mounded storage. More specifically, mounded storage being used to reduce spacing requirements. For example, if a LPG bullet is required to be 100 meters from a fence line, does having that same bullet in a mounded application reduce the spacing requirement...
  19. Casimo5

    Flow Meter Placement

    All good advice, thanks! This is in the troubleshooting stage. We are also controlling condensate in the reboiler by putting two steam traps in parallel (instead of just one) going to a condensate pot with level control.
  20. Casimo5

    Flow Meter Placement

    Thanks. We'll probably end up running it in cascade control. You're right, the flow meter will be for information as well.

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