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  1. Mike4chemic

    Mixing Two Fluids at Different Pressures

    Thanks to everyone for your comments.
  2. Mike4chemic

    Mixing Two Fluids at Different Pressures

    Dear Colleagues, I would like to consult with you regarding the following issue. We use a mixture of hot brine and condensate as a heating agent in the preheater. The water and condensate is mixed at the preheater inlet. The brine pressure at the mixing point is 10barg while the condensate...
  3. Mike4chemic

    Falling Film Absorber

    Dear Colleagues, Any recommendations ?? Could you please recommend the engineering book that can be used to calculate a falling film absorber? Thanks, Mike
  4. Mike4chemic

    Falling Film Absorber

    Dear Colleagues, Can you please recommend an engineering company which has a proven experience in the design of a Falling Film Absorber. A company location doesn't really matter. The application is an absorption methanol vapor by lithium bromide solution. Thanks, Mike
  5. Mike4chemic

    Froude Number Equations

    The file attachedhttps://files.engineering.com/getfile.aspx?folder=26064b40-589c-4c2c-8f98-f6b66d2523c7&file=B-B.PNG
  6. Mike4chemic

    Froude Number Equations

    Thank you All. I found the 1st equation in the "Beggs-Brill Two--phase flow in pipes" book. Please see the attached. In the equation Vm is 2-ph mixture velocity. For which applications the 1st and 2nd forms are applicable? Thanks, Mike
  7. Mike4chemic

    Froude Number Equations

    Dear Colleagues, I found in a literature the different form of the Froude No. equation: Fr= V^2/g*D, instead of the well-known form: Fr= V/SQRT(g*D). At the same velocity the equations gave the different Froude numbers. Which of the equations is more correct? Thank you, Mike
  8. Mike4chemic

    Reboiler with a hot oil jacket

    Gentlemen, A lot of thanks for you recommendations. Mike
  9. Mike4chemic

    Reboiler with a hot oil jacket

    Hi, We are designing a pilot batch distillation unit, which consists of a small 40L jacketed reboiler. We are considering to install the electrical heating element below the bottom of the reboiler in a sealed jacket filled with a thermal oil.(the simplified sketch is attached).In order to...
  10. Mike4chemic

    CO2 dissolution required contact time

    Hello All, I check a feasibilty to inject a non-condensable gas (mostly CO2)into a water pipeline in continuous mode. The goal is to attain the complete dissolution of CO2 in water and further injection of carbonated water (as a single phase)undeground. Based on my estimation at the given...
  11. Mike4chemic

    Temperature difference along a distillation column

    Thank you Gentlemen. georgeverghese I try to summarise my understanding.For the simple batch distillation (with an empty column and without reflux),the vapor temperature at the top of column always is close to the reboiler's(liquid ) temperature, assuming the heat-losses and pressure drop over...
  12. Mike4chemic

    Temperature difference along a distillation column

    jari001, Thank you. In our case the pressure gradient along the column is neglegible,since the column is a simple riser without any internals. I am aware that the miscible n-pentane/oil mixture is non-ideal and deviates from the Raoult's law. My question is whether based on the ideal VLE data...
  13. Mike4chemic

    Temperature difference along a distillation column

    Hello, We try to model the separation of n-pentane from the syntetic seal oil/n-pentane miscible mixture by a simple batch distillation process (reboiler + riser+condenser) at the atmosheric pressure. The n-pentane boiling temperature is 38 deg.C. and oil boiling temperature is about 270 deg.C...
  14. Mike4chemic

    Downhill Pipeline Back-Pressure Control

    I thank you all. Kevin, Assuming the thermal losses through the uphill section is 2 deg.C, the P2 (vapor pressure) can't be lower than 4.7 barg. But on the other hand,the P2 is set by: the downstream re-injection pressure + two-phase fluid friction losses through the downward pipeline -...
  15. Mike4chemic

    Downhill Pipeline Back-Pressure Control

    Gentlemen, Thank you for the useful recommendations (I gave you two stars). Assuming, we will implement the control logic, as you suggested, including the pump's VFD control. Based on your experience, How practical it is to keep the more than 2,000 m pipeline pressurized, without hammering...
  16. Mike4chemic

    Downhill Pipeline Back-Pressure Control

    Hello, I am involved in the design of 8" geothermal condensate pipeline, its function to transfer the hot geothermal condensate from the Plant to an injection well. Since the condensate is at the saturation conditions( 5 barg& 159 deg.C),there is a pump station, which increases the condensate...
  17. Mike4chemic

    PSV Sizing for sub cooled liquid which flahses while in the PSV itself

    Thanks PaoloPemi. 2 question: 1) Can you send me some links to these threads ? 2) I saw many threads debating which is the correct equation to use ( HEM or HNE ), but my question was relating to : - What should be the criteria for the discharge nozzle size ( sonic velocity ? ) - Is it...
  18. Mike4chemic

    PSV Sizing for sub cooled liquid which flahses while in the PSV itself

    Hello all 2 questions if I may regard subcooled liquid sizing which goes through flashing inside the PSV. 1) PSV Discharge nozzle sizing : Is there a sizing criteria for the discharge nozzle of a PSV ? I didn’t see any relation to that nozzle . All the sizing equations and scenarios always...
  19. Mike4chemic

    Condensate Flow Through a Vertical Riser

    Gentlemen, Thank you for your answers. Is it possible to estimate the minimum condensate velocity (low operation mode) through the vertical riser so that gas bubbles will be swept out? Thanks, Mike
  20. Mike4chemic

    Condensate Flow Through a Vertical Riser

    Hello, Does anyone have experience with this? Here's my situation: We design a power facility which utilizes geothermal steam, which contains about 23% w. of non-condensable gases (mostly CO2). Steam enters to a kettle reboiler and condensed. The two-phase flow of condensate + steam/NCG at the...

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