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  1. robot6

    Desuperheating in PRO/II

    What's the best way to model a desuperheater? Difficulty arises if... 1) you try to control against "dew temperature," because you can add slightly more water and the temperature doesn't change -> solver doesn't solve 2) you send the outlet of the mixer into a phase separator and look for a...
  2. robot6

    Accuracy of ultrasonic thickness measurement.

    Do you get a more accurate result measuring the thickness of the metal of an elbow, when the process is running or when it is shut down? I'm concerned about interference from other sources. I think it may not matter, because the frequencies of ultrasound are not within the spectrum of the...
  3. robot6

    Sulfuric acid dryer

    A lot of sulfuric acid plant vessels are brick-lined. The vessel is typically made of carbon steel. Brick lining can crack during transport and installation, and increases the cost of the carbon steel vessel. On the other hand, 316L and other stainless steels can be found which have minimal...
  4. robot6

    Bustles on heat exchangers

    I often see bustles on steam heaters, and that makes sense, because you want the steam to be distributed evenly. Also, as the steam is cooled and condensed in the heater, its velocity at the inlet can become very great. I never see bustles on condensers and coolers, which use cold water to...
  5. robot6

    What's an FCE?

    Sorry, I don't know where else to post this, but it looks like "chemical engineering-other topics" would be the best place. I'm looking at a job description for a "Process Engineer -- FCE". Please let me know what FCE means. Thanks.
  6. robot6

    Mercury in a hot source

    I need to remove mercury from a gas which is produced from a hot source with ample hydrogen sulfide. As you may know, when you get a sample tested for mercury they report it as Hg0. But you don't really know whether it is chemically combined. And in most cases, this doesn't matter, because...
  7. robot6

    Sparging hot gas

    What are your thoughts about sparging hot gas? I imagine that if you can take relatively hot gas, say 400C or so, and introduce it into water, the bubble collapse might really aid mass transfer, moving in from diffusion/film limited to really be solubility limited. Also, this would increase...
  8. robot6

    Sparging into a slurry

    What are the difficulties in sparging air into the cyanide detoxification (INCO) process, CN- + H2O + O2 + SO2 -> OCN- + H2SO4 ? Typically the "substrate" is some kind of slurry ... how does this affect sparger selection? That is, the tank is vigorously agitated, so does the sparger have...
  9. robot6

    Brake Horsepower

    My boss says that you can quote the net electrical requirement of a system in brake horsepower. Perhaps I am confused, but it seems like brake horsepower is a measure of the amount of horsepower presented to the shaft, in other words, what horsepower would be required to stop the shaft of the...
  10. robot6

    Code question: installer

    Given that an installer is installing pressure-rated code-stamped vessels manufactured by a different fabricator who is a code shop, and given that the installer will only be welding interconnecting piping, and its elbows, tees and flanges, and his other work will be the installation of valves...
  11. robot6

    Hydrogen stress cracking

    Folks, I have been interested in hydrogen stress cracking and material selection. I have read the following page, http://corrosion-doctors.org/Forms-HIC/embrittlement.htm Do you have any other interesting references? This page suggests that atomic hydrogen may be the cause. I wonder if...

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