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Dear All, The casting of molten steel into blooms and the rolling process fascinated me as a child but now I am into refining. Can someone enlighten me on the role/job profile of a chemical engineer at a steel plant. Thanks

Dear RogerH How does dosing condensate remove fouling layer? What's the funda behind it?

djack, dcasto- Thanks for your inputs Rgds, rgrokkam

Thanks for your replies. Emmanuel Top-"If one of the exchangers is fouled, reducing flowrate of hot fluid cannot be of much help - simply the turbulence will be reduced, and therefore the overall heat transfer coefficient/rate. Extra amount of duty you get from cleaner exchanger will hardly...

Thanks for your replies. Hi dcasto, I have a series of unknowns- thermal conductivity, viscosity, outlet temperature, fouling factor. "Your exchangers are being coated with coke or salt causing pressure drop and lower heat transfer rates, U." Is there any way of quantifying the decrease in...

Thanks, I seek your comments on the thread below: http://www.eng-tips.com/viewthread.cfm?qid=218659&page=1

Dear All, I've a two heat exchgrs A, B in series. Desalted crude is being heated on tube side with gas oil on shell side. Over a 3month time I observed that 1. outlet temp of crude from exchgr B has dropped 2. pressure drop across B is also high both when compared to A. (Directionally, B is...

Can anyone explain the difference between mCpdT and UAdT..

Dear All, Of late two steam drums in boilers of our power plant have shown cracks during RLI. Can the forum throw some light on the possible reasons for cracks in steam drum and how to go about a preliminary investigation. Thanks

Dear All, I am trying to model a steam-naphtha reformer. I hit a block in searching the rate equations for methane reforming and shift reaction. Googl'ng did help in getting equations but some constants were missing. Any help would be appreciated.

Dear All, I've noticed catalytic fixed bed reactors being heated to specified temperature(start up) by either hydrogen or nitrogen. How can I estimate the time and quantity of hydrogen/nitrogen required to heat the bed to a specified temperature? Also ,what factors go into choosing between...

Dear all, What does transalkylation disproportionation of toluene (stream from Benzene-toluene fractionator) result in? What is the reaction? Thanks

Hello The pictures remind me of the same damage in one of our effluent lines. It was traced to Microbiologically induced corrosion. Any scope for that?

I am interested in studying the effect of mixing. My experiment would be like compare * the reaction in a narrow channel and the reaction in a rotating tube.(no catalyst) In both cases, I will maintain the same temperature, pressure, residence time. Am I overlooking any other important...

Hi, I am new process engineer in refining. Can anyone suggest me link for tools/ softwares to generate process flow diagrams .

Dear agf94510, CO2 removal is by PSA. "The by-product CO2 will be produced at a slightly reduced rate." Can you explain why. In that case, sub-cycle time like adsorption time, equalization time etc for PSA should be adjusted. Isnt it? Thanks

A plant is designed to produce hydrogen from Light naphtha. Feed is at 13000kg/hr. If I have to run the plant with a different feed ,say butanes will there be any hydraulic limitation. How should I go about investigating this?

Thanks Shahyar for your post. Ergun equation is for pressure drop in packed beds. But the equation can be rearranged. DP/L = g*(1-e)*(density of particle - density of liquid). where e is the voidage. There are layers of particles, each with different diameter. ( I mean its not a mixture )In...

Hello For the vessel shown in the attachment, size of the particles is different and the liquid entry is from the bottom. I want to calculate the minimum fluidization velocity from Ergun equation. To estimate the average particle diameter, I doubt the use of sauter mean diameter. Can I use the...

Is there any shortcut method to assess the performance of a hydrocracker(recycle type)?