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  1. chemEcaleb

    Sodium Chlorate Centrifuge Solids Discharge Deceleration Device?

    A 450 mm pusher centrifuge operating at 900 rpm discharges 8 tons per hour of 2% wt moisture sodium chlorate into an 10' long 8" vertical cylindrical chute that feeds a fluidized bed dryer (FBD). Chunks of product form on the screen of the FBD directly underneath the feed chute. Efforts have...
  2. chemEcaleb

    Nitrogen Purge Purity Requirements

    Ed, thanks for the tip on the ceramic oxygen sensors. I was only aware of fuel cell, paramagnetic, and laser analyzers. I'll have to do some more research on that, do you have any recommended vendors for these sensor?
  3. chemEcaleb

    Nitrogen Purge Purity Requirements

    Hey thanks for the good information Georgeverghse!
  4. chemEcaleb

    Nitrogen Purge Purity Requirements

    Anyway, I'm asking the question because I'm looking at getting a nitrogen generator instead of using liquid nitrogen delivered by bulk tank trucks, and I kind of already got the answer because I'm just having the vendor quote a skid with 99.9% purity and 99% purity because I know that the...
  5. chemEcaleb

    Nitrogen Purge Purity Requirements

    This electrolysis process has a long history, and up until the 80s air was used to purge the lines. After enough explosions, plants stopped being designed with air purges, and at this point internal corporate groups mandate that nitrogen be used as a purge gas.
  6. chemEcaleb

    Nitrogen Purge Purity Requirements

    Did you read my original post? Here's a question for you, would you cut in to a 20" fiberglass pipe with a hacksaw that has hydrogen in it?
  7. chemEcaleb

    Nitrogen Purge Purity Requirements

    It doesn't require pure nitrogen. I'm trying to spec out a nitrogen generator that will actually have a return on investment. One idea is to set the purity of the nitrogen below the LEL of hydrogen and oxygen by some safety margin. 4% oxygen in hydrogen is generally accepted as an explosive...
  8. chemEcaleb

    Nitrogen Purge Purity Requirements

    Nitrogen gas is used to displace hydrogen off gas from pipes generated in an electrolytic process to prevent explosions during maintenance, and cell line shutdowns when oxygen generation is increased. How do you determine the minimum purity of nitrogen required for this activity?
  9. chemEcaleb

    Operating Pressure and pressure drop

    Look at the name plate, get the information off of there (it might have MAWP/Temps). Or go out in to the field and stick and pressure gage or manometer on the point of interest.
  10. chemEcaleb

    Kerosene to jet fuel refining

    Or maybe microbial fermentation?
  11. chemEcaleb

    Kerosene to jet fuel refining

    I guess you have to start looking for a catalyst that would increase current efficiency, selectivity, and reaction time for an electrolytic reaction of CO2 to CO?
  12. chemEcaleb

    Filtration Problems: Sticky Slimy Cake in Brine Filtration of Chlor-Alkali Plant.

    ...maintenance has to open up these filters and wash off the socks which consumes an entire 6 man hours. I looked in to the following solutions: * Pall Zylon Filters - supposedly a magical goretex candle filter that will allow you to operate WITHOUT A CLARIFIER. We installed a pilot scale unit...
  13. chemEcaleb

    PSV Repair

    Are you feeling lucky? Find a brave maintenance technician and do it hot! >:)
  14. chemEcaleb

    PSV Repair

    Or you can reroute flow with hoses so you can block off a section of line to swap out the valve, if you can run without the PSV safely due to redundant PSV/relief device in alternate location. Or you can put a PSV on a tee and connect it to the hose line.
  15. chemEcaleb

    Chilled water distributaion header designing

    It's not rocket science though. You could probably do without calculations to design this header, and it would turn out fine. It all depends on your pump's capacity. Get the isometric designed, calculate the TDH, then look at the pump curve and make sure you're under the curve. Then you just...
  16. chemEcaleb

    Chilled water distributaion header designing

    If you're wondering if your pipe size is good, I would refer you to the Crane Fluid Flow manual which has some good rules of thumb for maximum flow rates through different pipe diameters. Just glancing at your flows I'd say 2" pipe for the header and 3/4" pipe for the branches is fine. You'll...
  17. chemEcaleb

    Nitrogen Purge for Thermal Oxidizer Vent Collection Header

    I recommend using the Husa method with a safety factor of 6. Just google "Husa gas purge" and you'll get all the information you need. There have been numerous discussions on eng-tips regarding this. Also you may refer to API Standard 521 Section 7.3.3.3.3.
  18. chemEcaleb

    melting sodium chloride vs electrolysis of brine

    Just saying, your idea is the worst. Don't do it... I work in the industry, and even in a modern plant with great, explosions happen, people get exposed to chlorine gas, and people get chemical burns. What you're planning on doing sounds like cooking "batches" in the basement of your "cottage"-...
  19. chemEcaleb

    Fluidized Bed Dryer Operation: What a Mess

    UPDATE: Increasing airflow in the center chamber helped, but still not fixed. I'm trying an experiment today. Going to plug the air vent on the drain box and see if that will cause less water droplets to be entrained in discharging product... Centrifuge manufacturer was confused why air was...
  20. chemEcaleb

    Modeling 3 pass shell and tube steam surface condenser.

    ...the Q from the latent heat of vaporization from the condensate flow rate. Then I back calculated my overall heat transfer coefficient from U*A*LMTD and I got the exact same heat transfer coefficient as the manufacturer... They got 246 I got 245 BTU/hr*ft^2*F. That's a good sign. For a 15%...

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