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  • Users: Petro0707
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  1. Petro0707

    Suitable Valve type

    Hi everybody… We are looking for suitable type of valve in outlet of thermal reaction furnace (in Clause reactor in sulfur recovery unit ) which should be made for high temperature ( above 1200 °C) .The valve to be placed in a line diverting hot gases for heating the process gas coming out of...
  2. Petro0707

    Temperature Inversion

    Oh..Yes,Dear 25362, Thanks for your reply. I do agree... It seems in our case dissolved oxygen in desalter wash water which we could not say very confidently 5-6 ppm but it seems in that range (we could do one or two analysis ) as i mentioned earlier that this desalter wash water is phenolic...
  3. Petro0707

    Temperature Inversion

    Dear Milutin, How are you doing…? Yes, I wrote for our case and we don’t regularly monitor sulphates in OH boot water but we could do few sulphate analysis in OH boot water in the past and we found sulfates in boot water in the range of 2 – 10 ppm and sulphates in desalter wash water in the...
  4. Petro0707

    Temperature Inversion

    Dear All, It is really interested case where detail X-ray / scanning electroscopic magnification view of top tray-top and bottom pieces / downcomer pieces talk about cavitation erosion and no any chlorides are detected on the trays but sulfates/sulfides are detected and more predominately...
  5. Petro0707

    Simulation softwares

    For different purpose there is different softwares packages like ASPEN Plus 2006 is good simulation software for columns/hydraulics apart from that HTRI is very good for heat exchangers /fin fan coolers/fired heaters rating/simuation/design purpose , KBC-Petrosim is also good for regorous...
  6. Petro0707

    Temperature Inversion

    Dear 25362,Miultin,0707, Thanks everybody ...It seems we need to go for Ionic modelling to improve our reliability of OH Corrosion.
  7. Petro0707

    Temperature Inversion

    Hi 25362 ,Milutin,0707, How are you ? We have carried out further analysis of top tray material deposits as well as downcomer weir deposits and we have found & confirmed that there was no any chloride as well as no any sulfide was detected and majority we have found is Ni,Cu,Fe &...
  8. Petro0707

    Ni alloys aquous corrosion

    Hi everybody, This article is very good where they talk about how various Ni alloy’s corrosion rate is sensitive with the various corrosive species like Oxygen,Organic acid,HCl etc.where I noticed that there is stip rise in corrosion rate of Monel when oxygen / air presence. Thanks & Regards...
  9. Petro0707

    Temperature Inversion

    Dear Milutin, Yes, you are right.In that calculation worksheet yellow highlighted cell (raw) indicates NH3 ppm in phenolic water & non phenolic water which is used as desalter wash water.Through overhead NH4+ & Cl- way, still some of the HCl can react inside the column with NH3 & whatever we...
  10. Petro0707

    Temperature Inversion

    Hi 25362 & Milutin, We use generally phenolic & nonphenolic water as desalter wash water which comes through surge drum , so, with this I am attaching desublimation temperature calculation of NH4Cl for cross validation purpose. The final dissociation constant is in atm.,so, the same after...
  11. Petro0707

    Temperature Inversion

    Dear 25362,Milutin, As per past data statistics,On an average, 25 ppm is the total chloride in overhead boot water & 40 ppm is the total ammonia (not free ammonia but all amines etc.) in overhead boot water.So, we assume that 0.1 % of crudemix nitrogen is getting converted in to NH3 in crude...
  12. Petro0707

    Temperature Inversion

    Dear 25362, Thanks for sharing, Just couple of hours back I went through the same article , whether is it commercially proven or executed…that is again a question mark or if we go to the root cause ,then how do I exactly calculate partial pressure of HCl & Partial pressure of NH3 in the overhead...
  13. Petro0707

    Temperature Inversion

    Hi Milutin, You are right,but it seems little difficult to calculate exact HCl & NH3 concentration in tower top section as , organic chlorides which comes along with the feed, it can crack in the CDU Furnace as our CDU COT is as high as 385 C, it can form HCl , Nitrogenous compounds presence in...
  14. Petro0707

    Temperature Inversion

    Hello..25362,Milutin,0707, How are you..? As I mentioned earlier,we were dozing Corrosion inhibitor supplied by one of the vendor for about two months before this incident took place to reduce/minimize corrosion in naphtha p/a circuit ,this C.I.MSDS is : Unsaturated dimer fatty acids : 55-65...
  15. Petro0707

    Temperature Inversion

    Hello..25362,Milutin,0707, How are you..? As I mentioned earlier,we were dozing Corroison inhibitor in naphtha pump around circuit for two months ( ~ 3 ppm C.I. we were maintaining - dozzing rate 8 liter/hr ~10MT was used for entire two months) to cop up with the corrosion before this...
  16. Petro0707

    Temperature Inversion

    Yes, We sometime process slop which are nothing but an HVGO,HAGO,Diesel like material but usually after shutdown of the unit & these slop processing is not continuous basis, whatever offspec material of above remain, those are processed after analysis of BS&W. Looking to the NH4Cl vapor...
  17. Petro0707

    Temperature Inversion

    What is ROT ? & can you pl. suggest NH4Cl ,NH4HS desublimation temperature nomogram or graph please..?
  18. Petro0707

    Temperature Inversion

    Dear 25362, Are you talking about the one which has shown on page no. 75 ( Section 6.9 ) in D’Jones or else? , Actually, we are using the below dew point temperature calculation formulae is it in order ?? or what will be the dew point in case of inclusion of NH4Cl,NH4HS desublimation...
  19. Petro0707

    Temperature Inversion

    Actually, P/A exchanger immediate o/l temp. is low 90 °C & after mixing with hot bypass final reflux temperature to column is 97-100 C which was indicated in the I-MR graph.Can you pl. suggest ionic model or NH4Cl,NH4HS desublimation temperature –how to calculate it or how to incorporate effect...
  20. Petro0707

    CDU Design Detail

    Hi Milutin, The purpose is to measure the IR flow which is going towards below tray,From another end...I can think off that whatever deposits,foulants are there in top section can go towards below & donot accumulate on top trays and donot create furthur depositions and under deposit corrosion...

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