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  1. Alphite

    CO2 Liquefaction

    Thank you both, this was incredibly helpful. Saved me a lot of headaches =)
  2. Alphite

    CO2 Liquefaction

    Thank you very much for the help!! This definitely gets me further along. I'll try to build out my model more before I bombard you with questions. And yes, my energy required was off, I was accidently giving the number I had at 5 T/d. It was 21-26 kW at that flowrate, depending on the constants...
  3. Alphite

    CO2 Liquefaction

    I realize this is a common engineering problem, but after hours of searching/calculating I could use some advice. I'd like to liquefy a CO2 stream (assume 99.9% purity). 5-10 T/d, 20 bar, 40C incoming, cooling to -19.5C at 20 bar. I understand the heat transfer calcs, and it comes out to...
  4. Alphite

    Diagnosing Pressure/Flow Issues

    Hi, I'm trying to diagnose issues with an existing water distribution system, and am looking for general guidance on troubleshooting, or even specific advice. There are two storage tanks connected via bottom valves. They both feed a 3" pipe, which then splits to two distribution pumps, one for...
  5. Alphite

    Cost Increase for Classified Area

    I posted this in a different section, maybe I'll get more luck here... I'm working on the design of two separate rooms, one is class 1 div 1, the other is class 2 div 2. Right now I'm going through the design proposal (layout, flowrates, PHA, etc), however I need to understand the cost before...
  6. Alphite

    Costing for Class I or Class II Area

    Hi, I'm working on the design of two separate rooms, one is class 1 div 1, the other is class 2 div 2. Right now I'm defining the process aspects (layout, flowrates, PHA, etc), however I need to understand the cost before it gets too far along. Does anyone know of good references for...
  7. Alphite

    Piping for Pilot Plant

    Thanks for the replies! Bronyraur: I have to confirm, it's possible the previous systems had two separate control valves, one for steam in the top, and another for chilled water in the bottom. Everything is behind a wall and there are no drawings... There is a separate return line for chilled...
  8. Alphite

    Piping for Pilot Plant

    I'm trying to size piping to several jacketed tanks (25L, 40L, 60L). Everything will be heated with low pressure steam, and cooled with chilled water. I calculated the approximate cooling time, and my heat transfer value U appears to be correct based on actual results from a similar tank. I...
  9. Alphite

    Flowrate and pressure control for a spray ball

    Thanks!! I guess you've had experience with this? I was also thinking that the spray ball would generate a fixed pressure at any given flow rate. Then I asked the vendor to confirm and the rep told me that was not the case...
  10. Alphite

    Flowrate and pressure control for a spray ball

    My first post, I'm having some trouble with getting the right flowrate/pressure for a spray ball. Rotating spray balls require a flowrate and pressure for optimal operation. One condition could be 10gpm/30psi, while another could be 12gpm/40psi. Is there a way to control both flowrate and...

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