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  • Users: DonyWane
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  1. DonyWane

    Unexpected Packed Bed Scrubber Performance

    We recently began startup testing of a new scrubber configuration at our plant. Details: Column: 6" Pipe Packing: RMSR 40 (essentially 1.5" IMTP) Pfactor = 24 ft-1 Packing Height: ~4 ft. Test gas: Nitrogen quenched to approximately 100F (gas temp could be higher) Test...
  2. DonyWane

    Calculation of NTU for Scrubber

    I am performing some design calculations for a HCl / KOH scrubber. I have calculated the height of a transfer unit assuming that the mass transfer characteristics behave like a HCl / H2O scrubber (but with H+ concentration always at zero because of the excess KOH I know that I have). Next (and...
  3. DonyWane

    Halar Electrostatic Coating

    I have been asked to evaluate a Halar electrostatic spraying operation to determine what exhaust rate is required to maintain the plastics concentration to a value less than 1/2 the MEC (minimum explosible concentration for dust explosions). Does anyone know what the MEC of Halar powder is...
  4. DonyWane

    Halar/ECTFE Minimum Explosible Concentration

    I posted the following message on the plastics forum - but it doesn't seem to get much mileage these days. Perhaps one of you could help.... A general web search didn't turn up any results and I do not have any plastics literature - so I wanted to run this up the flag pole with you guys/gals...
  5. DonyWane

    Halar/ECTFE Minimum Explosible Concentration

    A general web search didn't turn up any results and I do not have any plastics literature - so I wanted to run this up the flag pole with you guys/gals. Does Halar/ECTFE have an MEC and if so, what is it? Also, what are acceptable methods for determining source terms that would feed into...
  6. DonyWane

    Lithium/Water Reaction

    I have found several references to the rate of reactions for metal/water reactions, but they have all been qualitative. Does anyone know what the rate of reaction for a lithium/water reaction is (quantitatively)? I know that it is slower than sodium and much slower than cesium, but that is...
  7. DonyWane

    Double Diaphragm Pumps

    I posted this question in the Piping and Fluid Mechanics forum and didn't generate any responses - so, I thought that I would give it a try here. If I have one double diapragm pump on a closed loop, I know that I can simply take the pump curves for the pump, use the air pressure curve that...
  8. DonyWane

    Air Fed Double Diapragm Pumps

    If I have one double diapragm pump on a closed loop, I know that I can simply take the pump curves for the pump, use the air pressure curve that corresponds to my air pressure, and find the flow at any given frictional resistance. Here's the question (somewhat spurred by previous discussion...
  9. DonyWane

    Flow Modeling using Electrical Circuits

    I'm looking for interesting ways to approach basic or typical problems we are faced with as Chemical Engineers to "beef" up my understanding of the principles. For systems where we are not concerned with the effects of inertia or fluid compressibility, we can apply principles of...
  10. DonyWane

    Flow Through Irregular Orifices

    I need to estimate compressible fluid flow through an irregular orifice (i.e., a thin, circular ring or gap as opposed to a circular hole). I would think that an upper bound would be provided by modeling my flow area as a circular hole with an equivalent flow area to my "gap" area...
  11. DonyWane

    Pressure Drop Across Orifices

    Crane Technical Paper 410 provides a basic equation for the calculation of pressure drop across orifices: q = (Cd*A)/(SQRT(1-B^4)))*SQRT(2gh) or q = CA*SQRT(2gh) My question is: Does this equation hold for high pressure drops (approximately 80-85 psi) over very small orifices (~0.05&quot...
  12. DonyWane

    ASME/API Fire Analysis

    What are the requirements for evaluating the pressurization effects of external fire on atmospheric vessels? If there is no credible fuel source (ignition source is present, but no fuel), is it required by Section 8 of ASME BPV code to ensure the atmospheric vented vessels would remain below 15...

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