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  • Users: SeanB
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  1. SeanB

    Who owns the operating procedures and prepare them?

    My experience as a Process Engineeer is that I would supply operating guidelines. Usually a high level overview of the process. This is then turned over to operations to develop detailed operating procedures.
  2. SeanB

    Design temp. and pressure

    If I remember this correctly... You conduct the UT or RT to find the minimum wall thickness remaining in the pipe. Then using the minimum wall thickness remaining calculate the maximum allowable operating pressure.
  3. SeanB

    Gain experience in Process Engineering

    Did you not have a plant design course as part of your curricilum? I am sure there are many books available that can help you. The most knowledge you are going to gain is through work experience.
  4. SeanB

    Full Vacuum vs Half Vacuum

    To MJCronin: I think you should go back and take a read of what I wrote. "I am not sure of the exact reason but it is pretty typical to only specify half vacuum for vessels that are only steamed out for maintenance. That is what is specified in our design manuals." "Our" being the EPC I work...
  5. SeanB

    Full Vacuum vs Half Vacuum

    I am not sure of the exact reason but it is pretty typical to only specify half vacuum for vessels that are only steamed out for maintenance. That is what is specified in our design manuals. Maintenanace procedures would dictate that the vessel is not to be blocked in during steam out. My guess...
  6. SeanB

    Piping Pressure when Pump is Dead-Headed

    No you don't have to align the piping design pressure with the casing MAWP. I usually set the downstream piping design pressure as the maximum discharge pressure - which is shut off head plus maximum suction pressure. However, keep in mind that if you ever put a bigger impeller in the pump your...
  7. SeanB

    PSV on a minimum flow line

    So you have a sample loop that comes of your pump discharge is regulated down to 50 psi and then returns to the suction side. So to see greater than 50 psi you would have to have your regulator fail, the pump suction valve closed and the valve closed at the deaerator closed as well?? A sketch...
  8. SeanB

    Desin Pressure on line list

    I have seen it done both ways. However, my experience has been that the design pressure as shown in the line list is maxiumum pressure that the line can actually see. For example, if the line is connected to a vessel that is protected by a PSV then the maximum pressure the line can see is the...
  9. SeanB

    Naphtha Tank Blanket Gas

    I have only seen refinery fuel gas or nitrogen used.
  10. SeanB

    #2 Splitter- Condensate Flow Valve Utilization in Gas Plant

    You need to look at the required Cv at your normal and minimum flow operating conditions as well. At the maximum the valve appears to be suitable. Check the required Cv and valve opening at the minimum and normal condition. That is where you might run into problems.
  11. SeanB

    Relief valve - releasing oil back to the sump or to the pump suction line

    Back to the sump is the safer method. By going back into the suction line you are essentially creating a recirculation loop - fluid from discharge goes thru PSV into suction line and back through pump again. So, system is protected from overpressure but now you are starting to heat up the...
  12. SeanB

    #2 Splitter- Condensate Flow Valve Utilization in Gas Plant

    It depends on the Cv of the valve. If you have the valve make and model you can contact the vendor and have them check rate the valve for the new operating conditions. If it is a Fisher valve you can download software to do the check rate yourself.
  13. SeanB

    Connection Break specs

    If there is any valve in the 150# line that can be closed to create a blocked discharge situation you have the potential to overpressure the 150# system. If you can't CSO the valve then you would need a PSV to protect the line. Your contractor is proposing an ESDV. I assume to trip closed on...
  14. SeanB

    ICE PLUGGING AIR LINES

    And not to mention that your instrument air has been dried so that the water vapor is essentially non-existent.
  15. SeanB

    Connection Break specs

    This is why I would like to see a sketch. You will have to carry the 300# rating up to the last valve in the system. Any valves in the 150# system will have to be CSO or better Locked Open or you have to install a PSV in the 150# system.
  16. SeanB

    Same level bridle Control & Trip

    I don't know if it is in an API anywhere but it is definitely an industry best practice.
  17. SeanB

    Connection Break specs

    A sketch would be helpful.
  18. SeanB

    MDEA concentration vs H2S concentration of inlet gas

    You have 3 posts on here regarding gas sweetening. Wouldn't some of these questions be better directed at the Process Engineer that I hope is working with you?
  19. SeanB

    Dears: please tell us the main rea

    Yes, please define high overflow. Also what gas are you scrubbing with the amine and where does the gas go after the scrubber?
  20. SeanB

    VGO tan

    Instead of typical wouldn't it be better to have a VGO sample taken to your lab and the TAN measured?

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