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  • Users: lcms
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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 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. lcms

    Fire Preventing on Flare Stack Surroundings

    Dear Friends, I am contratcting the basic design for a complete relief system, including Flare Stack and Knock Out vessel. The engineering company bring to discussion if we would need any fire preventing system (sprinkles; etc.) for KO vessel and near the stack bottom in order to avoid fire in...
  10. lcms

    Improving Steam Stripping for Monomer Recover from Latex

    Dear Sirs, I have to improve my existing process for recovering Acrylonitrile from an emulsion and I am considering to test a Prosonix direct steam injection device in a recirculation pipe to mix better the steam within the latex in order to increase the contact efficiency between steam and...
  11. lcms

    TBC removal from Butadiene

    Dear Colleagues, Does anybody have some experience on TBC removal from Butadiene by adsorbents? I will have to mount a TBC removal from Butadiene traditional unit for our Rubber Prodution Plant (envolving Sodium Hydroxide washing) but, honestly, I am a little bit tired of designing processes...
  12. lcms

    Micromotion Massflowmeter RFT-9712 transmitter board malfunction

    Dear Sirs, We have at our plant (Petrochemical) almost 30 Micromotion Massflowmeters ranging from 1/4" (D-006) to 3" (DS-300), most of them bought and installed in 1992. They have been working pretty well since then, but recently they have presented a recurrent problem (RFT-9712 transmitter...
  13. lcms

    Micromotion Massflowmeter RFT-9712 Transmitter Board

    Dear Sirs, We have at our plant (Petrochemical) almost 30 Micromotion Massflowmeters ranging from 1/4" (D-006) to 3" (DS-300), most of them bought and installed in 1992. They have been working pretty well since then, but recently they have presented a recurrent problem (RFT-9712 transmitter...
  14. lcms

    Parts for a Hammer Mill (Hammers)

    Dear Mates, I have a BD-34 Jeffrey Hammer Mill with stainless steel internals (34"x36", 150HP, 1800 RPM) that we use as a crumb shredder for crude rubber. Two days ago a metal rod bar accidentally felt inside it and broke all the fixed hammers (we call it "fixed" as an oposite of the other...
  15. lcms

    Dissolved oxygen removal from fluids (both inorganic and organic)

    Dear Fellows, Dissolved oxygen can be considered the most important poison of any REDOX polymerization initiation system. It reacts very rapidly with the reductor component of the REDOX system, deactivating it and suspending the reaction start until all the oxygen has been consumed (AKA "lag...
  16. lcms

    Set Pressure for a Liquid Thermal Relief Valve on a Butadiene Pipe

    Dear Folks, I have a 1,500 ft non insulated long pipe (sun exposed) which we use on butadiene liquid transfer between two vessels in our plant. This pipe is a 3" seamless carbon steel ASTM A-106 B schedule #40 (wall thickness=0.216") alleged to be specified as 150# class. However, I have...
  17. lcms

    Liquid Ring Water Pump Capacity Control

    Gentlemen, We are designing a new vacuum system to recovery condensable gases from a set of 9 tanks that works on a batch mode with unpredictable overall load (I mean, each vessel can go from maximum load at start of the process to the minimum load at the end of the process in a independent...

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