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  1. lcms

    Dear Colleagues, I am designing

    Dear Colleagues, I am designing a vaccuum destilation system for removing one volatile monomer from a latex through a steam stripping vertical column with trays. Above the column I have included a foam trap vessel with a demister in order to avoid the foam (developed by monomer evaporation in...
  2. lcms

    Is there any problem in using a rotary lobe pump to transfer butadiene (lpg)?

    Dear TiCl4, First thank you for your useful post. One of my available pumps is a Borger LOBE pump (not Gear) model PL-300 and probable would not have the issues described by Latexman concering weraing, but as you have noticed in your e-mail, the butadiene is very close to saturation condition...
  3. lcms

    Is there any problem in using a rotary lobe pump to transfer butadiene (lpg)?

    Dear Latexman, First, thanks for your advice. It is exactly what I would do if I had do specify a new pump, but I am trying to take one of ours available pumps to make the project feasible. Since I have to pull the butadiene from a vessel underground, I have to consider a sel priming pump...
  4. lcms

    Is there any problem in using a rotary lobe pump to transfer butadiene (lpg)?

    Dear Sirs, I am working in a project where we will have to transfer a liquified gas (Butadiene, 3 kgf/cm2g; 30C) from a vessel bellow the sucction pump to charge a reactor that requires at least 7 kgf/cm2g at pump discharge. I am considering to use a rotary lob pump I have available at my WWTP...
  5. lcms

    API-650 Stainless Steel Minimum Thickness and Design Temperature

    Dear IFRs and JSephen. Thank you very much for your enlightments. Have a nice weekend. Best Regards, Luís.
  6. lcms

    API-650 Stainless Steel Minimum Thickness and Design Temperature

    Dear Sirs/Madams, I am a Chemical Engineering and, therefore, not the right professional to specify storage tanks for industrial aplications, but recently I have specified a process data sheet for an atmospheric tank to storage liquid fatty acids at 60 Celsius degree and choose the API-650 12th...
  7. lcms

    Failure (Error # 3) in a EJA DP tansmitter (Yokogawa) used as a boiler¦s drum level sensor

    Dear xnuke, First, thank you for your fast reply. Concerning your question, the transmitter is well protect against temperature, and the impulses lines are far from the heat sorce and full with cold water (condensate). Our main concern, regarding enviroment conditions, are related to vibration...
  8. lcms

    Failure (Error # AL.03) in a EJA-110 DP tansmitter (Yokogawa) used as a boiler¦s drum level sensor

    Dear Sirs, The company where I work (rubber production industry) as a Process Engineer has two Alfa Laval Boilers MP-6.5 (6.500 kg/h)for saturated steam 170# generation fully automated with Yokogawa instrumentation, including FF communication platform. This steam generation area has been...
  9. lcms

    Failure (Error # 3) in a EJA DP tansmitter (Yokogawa) used as a boiler¦s drum level sensor

    Dear Sirs, The company where I work (rubber production industry) as a Process Engineer has two Alfa Laval Boilers MP-6.5 (6.500 kg/h)for saturated steam 170# generation fully automated with Yokogawa instrumentation, including FF communication platform. This steam generation area has been...
  10. lcms

    Lamellar Gravity Settlers sludge accumulation in the bottom part.

    Dear bimr, Thanks for your help. I also have consideres flotation would be the best option for our wastewater, but at this point I will have to consider it as my last alternative since my plant is already runing and a modification of this magnitude would require resources (money; time...
  11. lcms

    Lamellar Gravity Settlers sludge accumulation in the bottom part.

    Dear bimr, Thank you for your valueable tips. I fully agree that the inclination of bottom tunnel wall should be much great. I would have thought something lika 60o degrees (or 55 degrees as you said). The concentration of sludge is 7.900 mg/l, and the influent must be around 600 to 1,000...
  12. lcms

    Lamellar Gravity Settlers sludge accumulation in the bottom part.

    Dear Sirs, I work at a Rubber Factory Plant that have started up a wastewater treatment plant since february´ 12. Our worst nightmare (among small others) is the primary physical treatment where we have a rapid on line mixer to mix 200 ppm of alum with our pH adjusted raw wastewater (to pH...
  13. lcms

    When could one use a Cold Vent Stack instead of a Flare Stack?

    Dear Friends, Thanks for you all. Fortunatelly my bosses are not stupid (they are quite clever in fact) and accepted very well that we have no other way than building a flare. I am already quoting and it must be working by september next year. All the posts; hints; opinions you sent me so far...
  14. lcms

    When could one use a Cold Vent Stack instead of a Flare Stack?

    Dear Matt, Allow me to explain my point: - I fully agree with you. Nevertheless, I have to convince my Board (Who will have to invest a big amount of money in a flare stack) that this is the only option as you say. They were a little bit septical when I have used exactly your arguments...
  15. lcms

    When could one use a Cold Vent Stack instead of a Flare Stack?

    Dear Chance17, Thank you very much again for this valuable information regarding butadiene concentration limit at factory fence. Now I can do my calculation (stack heigh) using the following three criteria: 1) 300 ppb at site fence; 2) 2 ppm at grade floor of the stack (inside the plant)...
  16. lcms

    When could one use a Cold Vent Stack instead of a Flare Stack?

    Dear Chance17, Thank you very much for your helpful hint. It was higly appreciated. I fully agree with your understanding that streams with butadiene must be sent to the flare stack to be destroyed to avoid Butadiene emissions to atmosphere, concerning enviroment and health issues. Our plant...
  17. lcms

    When could one use a Cold Vent Stack instead of a Flare Stack?

    Dear Friends, The petrochemical plant where I work is being asked to get out of our present flare system header that is shared with another company. Therefore we have to design a new waste gas disposal for our releases that are in fact only generated in emergencies. We start the project...
  18. lcms

    Cold Vent Stacks or Flare Stack?

    Dear Friends, The petrochemical plant where I work is being asked to get out of our present flare system header that is shared with another company. Therefore we have to design a new waste gas disposal for our releases that are in fact only generated in emergencies. We start the project...
  19. lcms

    Fire Preventing on Flare Stack Surroundings

    Dear maddocks; Thank you for your tip. In our design, the flare stack height is 100 ft and our radiation protected area (not clay, but small rocks that have the same effect - be unburnable as you said) is 150 ft, so we agree in this matter. Besides, I fully agree that if everything we design...
  20. lcms

    Fire Preventing on Flare Stack Surroundings

    Dear Stonecold, Thank you for your answer. As you have mentioned, since only you send me a comment, I am starting to think that this concern could be a little bit stupid. As a matter of fact, I have never thought about this matter until the engineering company in charge of this project (a...

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