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  1. maddocks

    Amine Sweetening - ProMax

    Matching tower temperatures in amine absorbers can be very challenging. it's a function of reaction chemistry, kinetics, interface, tray residence time, tray efficiency, foaming/froth, etc. You need to input the correct number of actual trays and then start adjusting efficiency values until...
  2. maddocks

    Iron Sponge

    Does anyone have any sizing guidelines for an iron sponge tower? I know there are a lot of alternatives including aqueous iron processes, triazine, bio, etc. I've been asked to check on the required size of an iron sponge system. I need mass pickup of H2S in lb/lb and a space velocity...
  3. maddocks

    Amine Sweetening - ProMax

    Honestly this is a new one. I've been running this software for decades and haven't seen this error - you need to contact their helpdesk to see what's going on.
  4. maddocks

    Blowdown Initiated by Flare KOD LSHH

    Doing a blowdown on a LSHH in the KO drum is an incorrect action. The resulting flow will potentially carry significant amounts of KO drum liquids up the stack. If you're lucky, these fluids aren't flammable. The good news is that the LSHH will clear. :) Block and hold is the answer.
  5. maddocks

    Elevated flare steam control valve flail safe position

    I probably would have expected a fail open valve with an orifice assembly to limit maximum flow.
  6. maddocks

    Steam temp set point for Rebiolers

    You really need to look at maximum heat flux, maximum bulk fluid temperature, superheat, pressure drop, and a bunch of other factors. The flow is determined by the duty of the unit including condensing (the majority), desuperheating, and subcooling. Ultimately the exchanger will reach a...
  7. maddocks

    H2S Removal Via MDEA Spray Nozzle

    This should work reasonably well - as dcasto suggested, it will approach the equilibrium effect of a single theoretical stage. You could probaby simulate this at about 30% efficiency and see if this is enough for your application. The H2S reaction is instantaneous however, the spray nozzle and...
  8. maddocks

    Auto Blow Downs on Gas Detection

    Is anyone aware of a code and/or published guideline that requires an auto-blowdown of a natural gas facility when a gas detection event is triggered? We often do this at 20 ppmv or 40% LEL but is this a code requirement or just common practice. The plant is 24 hour attended and the owner is...
  9. maddocks

    Anybody Know the MAWP of a Tanker Truck?

    We use pressurized LPG tankers - designed for 250 Psig. Totally depends on the fluid, the contract and the hauling company.
  10. maddocks

    Equation to calculate the back pressure for a PSV discharged to atmosphere

    Be careful using Panhandle for anything other than long single phase gas lines and even then, we often correct for sctual conditions or if we can reference back to real pressures. It can be horrifically wrong sometimes.
  11. maddocks

    Condensate Stabilizer Vacuum Condition

    Hang on, I'll put this in excel format so you can copy/paste. Here it is in mole %http://files.engineering.com/getfile.aspx?folder=5de5fbf8-5b35-484c-98cb-b32f415ffef4&file=Tower_Feed.xlsx
  12. maddocks

    Condensate Stabilizer Vacuum Condition

    ok, see below. Feed is at 109°F and 60 Psig and the reboiler will run at about 267°F to make a 12 RVP stable condensate. Tower will run at pretty much 60 Psig.http://files.engineering.com/getfile.aspx?folder=f2ac9d6a-1c30-4585-9d39-f84c0a1dec14&file=06-10-2013_1-43-29_PM.jpg
  13. maddocks

    Condensate Stabilizer Vacuum Condition

    Haven't done the image thing before -
  14. maddocks

    Condensate Stabilizer Vacuum Condition

    Yeesh, fast fingers but slow brain. I was trying to say that simple bubble point calc's don't seem to represent column performance because each stage is at a diferent temperature.
  15. maddocks

    Condensate Stabilizer Vacuum Condition

    It doesn't seem to be that simple. I've tried just a straight forward JT valve with the outlet set at -30°C and the pressure drops into a vacuum. This is still with almost 5% methane in the stabilzier column feed mixture. It almost seems like I have to do a stage by stage flash where I...
  16. maddocks

    Maximum velocity for the Dowtherm A

    I used to have an old Dowtherm reference book that had some guidelines but I don;t recall if suggested system velocity was included. Check the Dowtherm site and the reference book?
  17. maddocks

    Condensate Stabilizer Vacuum Condition

    :) Yeah, I got that part. But, each stage has a different composition, different temperature, and a different dewpoint. So, once the tower cools off, a lot of the vapour collapses into condensate and the tower liquid level is raised slightly. But, the real question is, how much does the...
  18. maddocks

    Condensate Stabilizer Vacuum Condition

    We've been asked to look into the possibility of a condensate stabilizer dropping into a vacuum condition during a shutdown in a very cold Canadian winter. My gut reaction is that this won't happen, but I'm struggling with how to perform this calculation. The volume of the tower and reboiler...
  19. maddocks

    Discharge Piping Diameter Reduction

    You know, there's some huge gaps in the industry on things that I take for granted. It seems bizarre, because I've been doing this for so long, that (like you) I've lost touch with what I consider to be a learned skill and what I consider to be inherently engineering/common sense. It's never...
  20. maddocks

    i need to know the basics. pls any help or ebooks on chemical engineering?

    Unit Operations is the classic book for Chemical Engineering. Mine has a combination of tears, beer stains, and dog eared pages. You could also consider: "Plant Design and Economics for Chemical Engineers" by Peters and Timmerhouse as well as Perry's. I'm not sure if you're in the energy...

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