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Recent content by hswang2

  1. hswang2

    NPSHr and pump suction specific speed(S)/pump operating speed relation

    Dear expert I have some questions below. 1. Suction specific speed of pump and pump operating speed is the same thing or different. It should be different, and what is the relationship between these two characters? 2. As we increase the pump operating speed, the Reynolds no will increase, and...
  2. hswang2

    Bad result or not if Ethylene oxide react with water

    Sorry I don't put clear. Not using water or air to purge the EO pipe when there is EO running in the pipe. I plan to use either air/water to purge the EO pipe before it start up. Thank you so much.
  3. hswang2

    P&ID minium distance query

    Dear Si delta flag is means the class break of the pipe. If the no. of pipe will be changed in the next line, it should be put the delta flag in the connection. Thank you
  4. hswang2

    Bad result or not if Ethylene oxide react with water

    Sory to bother you this trivail. Ethaonlamine are produce by reaction of ethylene oxice and ammonia. The water increases the reaction rate of EO with ammonia and amines so water can be considerd as a catalyst for reaction. If using water instead of air to purge the EO pipe in the commisioning...
  5. hswang2

    P&ID minium distance query

    Dear Sir/Madam Positon in a P&ID don’t correspond to a 3D position. Therefore, the min. distance (yellow mark) in this P&ID seems weired (please see the attach document). Could anyone please help me what is the difference if this mim. distance is extend to the top line (the triangle break...
  6. hswang2

    Calculating the Entrainment From Vaporizer

    I have tried to figure out how to get the entrainment from the vaprozer. In this process, the multicomponent feed reactor is vaporize in the system shown in the attached graph. Liquid reactant feed enters a horizontal kettle vaporizer that is heat by a process stream. Vapor goes to a knockout...
  7. hswang2

    globe valve with spool blind query

    Dear Sir/Madam I attached part of the P&ID from my project. Could anyone kindly tell why is the valves and blind flanges set there together? Is any reason behind this? Thank you so much.
  8. hswang2

    Vertical thermosyphon reboiler recirculation ratio and total pressure

    Dear Sir/ Madam I am sorry to bother you this trivial again. I have tried to get the minimum thermosyphon reboiler height through writing a program in excel. But, I don’t understand how to get this total pressure drop formula (Please see the attachment), How does this formula come from? The...
  9. hswang2

    Vapor Density calcuation method in Vertical Thermosyphon Reboilr

    Thank you very much.
  10. hswang2

    Vapor Density calcuation method in Vertical Thermosyphon Reboilr

    Dear Sir/Madam I have a trivial question to bother you and it is about vapor density calculation question . I tried figure out using excep spreadsheet to calculatie the minmium vertical thermosypon reboiler height, but I don’t quite know how to get the vapor density ( please see the attached...
  11. hswang2

    Batch Alkoxylations reaction heat transfer delay question

    Dear all I am not sure the control scheme in the attachment is match the following description I wrote. TIC-001 and TIC-120 are temp to temp cascade control scheme. if the reactor temp is increasing, the reactor temp controller increase theset poit of TIC-120 for the cooling water flow, which...
  12. hswang2

    PSV sizing software question

    Dear all Could anyone please kindly help me to tell what kind of PSV sizing software is used in my attachment? And, what kind of free psv sizing sofware could I get in the industry? I am not quite familar in using any psv software cause I use small excel program developed from the senior...
  13. hswang2

    Batch Alkoxylations reaction heat transfer delay question

    Alkoxylations are commonly performed in industry for the production of surfactants and polyglycols by means of a simple semi-batch liquid-stirred reactor During the EO addition to reactor, pressure will increase due to the EO vapour partial pressure and the compression of the nitrogen present in...
  14. hswang2

    Vacuum system hydraulic calculation

    I make a simple calculation for this hydraulic question, but not sure that is correct or not. (pls see the attachemnt ) Thank you so much. http://files.engineering.com/getfile.aspx?folder=3d3ea892-197f-42df-b11b-caa5d0514b53&file=test1.pdf
  15. hswang2

    Vacuum system hydraulic calculation

    I tried to do the condenser vacuum hydraulic check, but I don’t how to start it. It seems very dumb cause I know this similar topic has discuss a lot in the forum. Please bear with me. My goal is to (1.) calculate the min. elevation of the reactor condenser? (2) calculate the height of flooding...
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