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  1. BenjaminM

    Optimal Steam Pressure for Jacket

    Thanks all. This is a new installation in an old factory. The vessel isn't going to be dedicated to one single product, we may run a variety of chemistries in it. George, Pierre, Seuenergy, thank you all three. You all hit on the same point about problems with over heating the product and...
  2. BenjaminM

    Optimal Steam Pressure for Jacket

    I am trying to decide how to go about determining the optimal steam pressure for a reactor jacket. For the sake of argument, I'll just say we're heating water. The jacket is rated for 150 psig, and we have somewhere around 145 psig steam available. Historically we'd stick a 50 psi regulator in...
  3. BenjaminM

    Keyed Hose Connectors

    shvet, What you have shown in the photo with the gold and blue fittings is very near what I am looking for if you have a vendor.
  4. BenjaminM

    Keyed Hose Connectors

    Littleinch, In our case we have primarily 2" hoses. We really only need two separate hookups. Those for the process of concern and those for normal process. I am ultimately in need of an alternative to cam & groove. We could make every thing for the process of concern flanged, but I don't...
  5. BenjaminM

    Keyed Hose Connectors

    Thank you all! pierreick, In our case, we have five vessels that we run a particular product line in. The concern is that residue from these products may remain in hoses / pumps / filters and contaminate other products produced in other five vessels if those hoses are inadvertently used. (ppt...
  6. BenjaminM

    Keyed Hose Connectors

    I am looking for a hose connector which can be keyed to prevent connecting to the wrong tank. What I am looking for is very similar to a standard cam & grove fitting, except for the male plug has a few pins in place which can only mate with a female socket with grooves for those pins. I had a...
  7. BenjaminM

    Turn Overs / Day For UV Sterilization of Water Tank

    We have a de-ionized water tank in operation in which we have experienced issues with algae growth. The line feeding the tank is treated with a ultraviolet sterilization system. After testing immediately before and after the UV system it appears to be working very well. However once the water...
  8. BenjaminM

    Continued Education / Training / Life Long Learning

    A topic I heard a good bit about while I was in school was "life long learning". In a recent employee evaluation the comment was made that I needed to consider taking classes in topics I was interested in. I routinely find myself researching / studying / reading to figure out problems. But...
  9. BenjaminM

    Rate Equation for Heating Vessel

    Latexman, My apologizes for the delay in my response. Between holiday and vacation, I've been out of the office for the past week and a half. My Perry's is the 7th edition. Equation 18-18, is basically the same as that shown in Kern 1950, Equation 20.1. These are the same equation as the one I...
  10. BenjaminM

    Rate Equation for Heating Vessel

    I am trying to develop a model for the change in temperature of an agitated tank with a steam jacket with time. In section 5.2 of Transport Processes and Unit Operations by Geankoplis, there is an equation (5.2-3) which describes the change of temperature of a solid object with time (eg...
  11. BenjaminM

    Concrete Thickness for Mix Tank on Load Cells

    We've got a small 600 gallon mix tank on load cells. When a forklift drives near the tank, the load cells deviate wildly, swinging 50 pounds or more. We've taken a core drill and sampled the concrete next to the tank. It's roughly 6" thick. I should imagine the question of how thick concrete...
  12. BenjaminM

    Sizing Vacuum Pump for Batch Distillation

    pierreick, We have a vessel with a solution containing a solvent. That vessel is connected to an overhead condenser which drains to a receiver tank. Vacuum is applied to the receiver tank, the solvent evaporates in the vessel, is condensed, and caught in the receiver. Ideally the outlet of the...
  13. BenjaminM

    Sizing Vacuum Pump for Batch Distillation

    ...be, I have a 10,000 gallon vessel from which I want to distill off 2,000 gallons of MEK, over a 12 hour time period at some temperature, say 60*C. What would be the minimum size pump to complete this? I've found some online calculators for determining time required, but they don't provide a...
  14. BenjaminM

    Sizing Vacuum Pump for Batch Distillation

    We've got several processes which we perform vacuum distillation on a batch basis to remove solvents. In some cases we use Nash liquid ring, they are real work horses. In other cases it is a smaller Kinney vacuum pump. I'd like to develop reasonable justification for what vacuum pump we use...
  15. BenjaminM

    Process Safety Time calculation

    From what I gather the Process Safety Time is the duration of time from surpassing an Operating Limit until you reach the Safety Limit and a failure occurs? If it is specifically a spread sheet for tank levels which you're looking for, if you google "vessel volume.xls" and take the first link...
  16. BenjaminM

    Delta T for Steam on Heat Exchanger

    ...did think it was interesting that Kern state on the next page "all heating services employing relatively air-free steam a value of 1,500 Btu/h.ft2.*F will be used for the condensation of steam without regard to its location." That is five times higher than the 300 Btu/hr.ft2.*F that I am...
  17. BenjaminM

    Delta T for Steam on Heat Exchanger

    Thank you all for the quick detailed responses. TBP, I had worked out the LMTD similar to what you've listed assuming no cooling on the condensate. I'll see if I can track down a copy of the book you referenced. I've seen a similar method in a Warren Control Valve catalog. TiCL4, it will be...
  18. BenjaminM

    Vacuum pump emission

    Can you stop the organics from getting to the vacuum pump to start with? Possibly by pulling through a condenser with chilled water? Also consider flushing the seal water from the vacuum pump before and after use.
  19. BenjaminM

    Delta T for Steam on Heat Exchanger

    ...I know how much heat is in a pound of steam. I have estimates of overall heat transfer rates of steam condensing and water, 250-400 Btu/h.ft2.*F. I know what temperature I want the water coming in and going out at. I know the temperature of the steam entering. What I don't understand is...
  20. BenjaminM

    Raoult's Law / Psychrometric Charts / Humidity

    MortenA, Roughly speaking I'm looking at an 8,000 gallon vessel which is half full being slowly heated to maintain 80*C. I am considering z1 to be 0ft at the surface of the liquid. I'm trying to determine how well mixed the headspace will be. If it is well mixed, I would think z2 would be...

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