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  • Users: nbog
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  1. nbog

    Sodium Metabisulfite Plant doubts / a lot of them

    Don't you have process eng in your office? He should be able to give you all these answers.
  2. nbog

    Sodium Metabisulfite Plant doubts / a lot of them

    Aditionally, Could you show me one of this "donwflow type of mixer"?. I didn't see one of this before, but I can supposue its basics functions. Try to find what type of mixer is used for thickener feed tanks. It is not a must, but could be considered. Another questions. When you mix NaMBS...
  3. nbog

    Sodium Metabisulfite Plant doubts / a lot of them

    why not just do this: 1. fill the mixing tank with water 2. dump the bag in the tank and keep mixing until dissolved 3. transfer the solution to your storage tank Don't know the capex limits or life of mine, but still - most of the reagents (except sometimes lime slaking) are done in a batch...
  4. nbog

    Double Wall Pipe- Pressure Vessel?

    40 psig is the backpressure in the cooling jacket.
  5. nbog

    Double Wall Pipe- Pressure Vessel?

    Fzob, the "vessel" is made of a 6" pipe, jacket welded onto it.
  6. nbog

    Double Wall Pipe- Pressure Vessel?

    6" pipe, 2 feet long, built as a pyrolysis chamber for R&D, welded cooling jacket. Gas side: T~ 600 C, P = 10-15 inWg vacuum, Jacket: water, 40 psig, 20C in, 35 C out R&D is over, we ran the system for a year, pyrolyzing salts and collecting the powders, all worked good... time to build a demo...
  7. nbog

    Advise on How to become a "good" Process Engineer

    0707 (Luis) - I did exactly the way you described. It is unbelievable how much you can learn (being fresh from school) from operators. I would just add: Find 1 or 2 guys close to retirement, those are willing to transfer their knowledge, discuss the things and ideas with them - you might hear...
  8. nbog

    Pressure of liquid nitrogen vessel is always over maximum pressure

    As MortenA said, there is no way you are going to have your liquid N2 "liquid" for so long. Your insulation is there just to minimize evaporation when the tank is not in use. We just order N2 when we have need to use it. Make sure the valve we call "pressure builder" is shut-off. It may be...
  9. nbog

    spraying/ coating bulk solid while conveying

    As unclesyd said, a rotary tumbler is one of the answers. I had it in a fertilizer (granular) plant. I added a lance with 2 spray nozzles and never had problems with it. You have to keep in mind that (depending on the properties of your granules) you might have to handle dust. We had...
  10. nbog

    Gasket for High Temp Application (Max 1200 Deg C)

    Graphoil (with SS, sandwitch type) can work if the atmosphere is not oxidizing. http://www.usseal.com/grafoilspecs.htm
  11. nbog

    Limestone Silo - Bag Filtration

    As cub3bead said, air-to-cloth ratio 3-5 should be OK for this case although, if you have a bin-vent type of baghouse (i.e. air flows upwards from the baghouse base, calculate min. settling velocity of your powder and make sure it is higher than the air velocity in the baghouse. Otherwise, you...
  12. nbog

    DLC chemical compatibility

    Thanks adamnat, I hope it will not affect the base material, it is 304 SS.
  13. nbog

    DLC chemical compatibility

    Hi all, one of the potential pump vendors (gear pump) wants to coat pump gears with DLC coating. Liquid I want to pump may contain up to 40% of nitric acid. Is the coating compatible with this application? I heard a case of WC coating failing after 100 hrs in a gear pump pumping nitric acid...So...
  14. nbog

    Air velocity for powder transfer through pipes

    Gas velocity should be above "saltation velocity" but going to high will cause erosion (abrasion) in your pipeline (mostly bends). Try to find recommended velocities for your material, but be careful - recommended values are safe as long as your powder's morphology (particle shape) and size...
  15. nbog

    Using a title "Process Engineer"

    I am kind of confused about this: My title in the company I work for is "Process Engineer" although the company nor the job description requires professional designation i.e. P. Eng (Canada, BC). Is it against the law if I use "Process Engineer" title on my business card? I don't have P. Eng...
  16. nbog

    Fluid transport by pressurized gas

    But more interesting about the system I saw is that the guy used it to feed a pneumatic atomizer. I didn't see anything on the schematics about pressure control, that's why I was puzzled. This would require good pressure control loop as requirements downstream are probably not constant i.e...
  17. nbog

    Agitator shaft/impeller coating

    Actually, I run the mixer at lower speed (let's say 100-150 rpm). Solution becomes grayish when it's finished. Doing the same thing in a lab (magnetic stirrer/beaker) results in a clean fluid). Isn't there some kind of hard, dense PE formulation, if I remember I ran onto it somewhere (trade...
  18. nbog

    Agitator shaft/impeller coating

    I have an agitator with 304 SS shaft/impeller. It is used to dissolve metal nitrate which becomes acidic as it dissolves so I have HNO3 generated in-situ. I noticed that the resulting solution, instead of being transparent, turns into darkish, although still transparent liquid. I am thinking...
  19. nbog

    Fluid transport by pressurized gas

    I saw somewhere interesting way of liquid pumping: instead of a pump, guy used simple pressurized vessel (gas from top) to push liquid through a pipe. Never thought about advantages of doing it that way. Although it was in a lab/pilot scale system. Any comments?
  20. nbog

    Single phase or 3-phase motor for blower

    Thanks for the tips. Nick

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