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  1. 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...
  2. 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
  3. 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
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. Mike4chemic

    Pump distribution line issue

    A process line requires connection to 3 pumps, only two work at the same time (see attached picture). The problem is that the fluid doesn’t seem to distribute evenly between the working pumps. This is not specific to a single pump, when 2 pumps operate there seems to be a preference to the right...
  11. Mike4chemic

    Vacuum Pump Performance above Sea Level

    Hello, We design a Vapor Recovery Unit, which its main part is a screw vacuum pump. The system will be located at a site in South America (elevation is about 2,000 m above sea level. The required vacuum level is 0.069 bara. Based on the pump's operation curve, which was received from a vendor...
  12. Mike4chemic

    Inert Gas Solubility in Water

    Hello, For our client, I try to perform the solubility calculations of the inert gases such as argon, nitrogen and hydrogen in geothermal water at 300 deg.F .One of the sources I am using is an article "Solubilities of inert gases in water 0 deg.C to near the critical point of water" by...
  13. Mike4chemic

    Gravity flow and self-venting design - how important is it ?

    Hello all I have a question regarding design of pipes for gravity flow and self-venting flow regime. There is a steam condenser (not a direct contact. A shell and tube ) ,which its condensate flowing from the bottom of the condenser head and to a condensate tank downwards. At that condensate...
  14. Mike4chemic

    Control valve vs silencer

    Hi, I have a vaporizer with a constant blow-down to the atmosphere of CO2 and Steam. The standard design for this blow-down is using silencer downstream of a control valve (attached case 1) I wondering whether I can use another control valve instead of the silencer (attached case 2) and still...
  15. Mike4chemic

    Equalizing line between two steam "polishers" connected in parallel

    Hello, In our power plant we have two similar steam "polishers" connected in parallel installed upstream of a Steam Turbine. Due to asymmetry of the polishers inlet two-phase (steam quality is about 99.8 % w), and steam outlet pipelines ,the polishers are operated at the different loads. The...
  16. Mike4chemic

    Pulling vacuum from vessel with n-butane

    Hello, Before performing maintenance at our facilities we need to completely evacuate 2 heat -exchangers from shell side with interconection pipelines from liquid N-butane. At the beginning we are draining all liquid from the HEs. Due to layout accessibility there are several of liquid residue...
  17. Mike4chemic

    sizing properrly spilout from open channel & sizing the vertical pipe

    Hi all I have a practical question that causes me to realize that 2 subject are not fully clear to me. One is the subject of designing lines for vertical gravity flow, and the other is open channel flow. Please bear with me as this might be a bit long… First I will give the raw data: We have...
  18. Mike4chemic

    Saturation steam flow through pipeline

    Dear All, Do I have to suppose that when the saturated steam flows through a pipeline it expands (due to friction losses, in my case about 2 bars) according to the isenthalpic-adiabatic model similar to the saturated steam expansion through a pressure control valve or an orifice? Is the...
  19. Mike4chemic

    Designing a water-pentane continuos seperator

    Dear all We are looking to design a tool to seperate water and pentane from each other . A little background : Without getting into too many detailes, there is a pipe with pentane , that got mixed with some water due to a leak from an outside water pipe. Now, there is about 10-20% water...
  20. Mike4chemic

    Condensate flow through the slopped down line

    Hi, I am currently involved in the process design of the geothermal condensate pipelines that convey the geothermal condensate flow rate-2,200 t/h at 10 bara @ 187deg. C to the power plant. The piping sizing, eq.length and elevations are presented in the attached sketch. I would like to ask you...

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