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  • Users: DDSpetro
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  1. DDSpetro

    Sulfur Pastill Crushing strength

    Hello..experts, Liquid sulfur from the Refinery is processed in Rotoform to produce sulfur pastill ,min.spec of crushing strength of 3.5 kg/cm2g ,liquid sulfur temp. remains 122 -125 C , C.W.Flow is ~ 35 m3/hr --indirect cooling below the belt.however..crushing strength is not able to meet the...
  2. DDSpetro

    Higher End Point of alkylate in alkylation

    Dear all , Warm greetings ! The sulfuric acid based Alkylation plant is facing problem of higher FBP/End point of aklylate coming out from it..because higher C11+ in the product,apart from the C5 in the feed,what all potential factors which can lead as the motive is to bring the end point <...
  3. DDSpetro

    Equation solver

    While running Matlab,some of the X1,X2 values out of 20 sterams are coming negative which is practically not possible as these are all flow rates of streams , how to correct in Matlab , is there any provisition in Matlab so, that we can have postiive coefficient and not negative ?
  4. DDSpetro

    Equation solver

    yes..u r right steve.
  5. DDSpetro

    Equation solver

    The attached data sheet is very typical ; because a*x does not equal to b in real practical scenario ; actually, this b answer is nothing but we can say a1x1+b1x2+c1x3+.....+t1x20 = b ;where b is known, a1,b1,...t20 is known but x1,x2 ,x3 are not known. like that equation is there. similary...
  6. DDSpetro

    Equation solver

    Dear all, Hello !! Eq.1 : a1X1+b1X2+c1X3+d1X4+.....+t1X20=3825; .. .. .. Eq. 20 : a20X1+b20X2+c20X3+d20X4+......+t20x20=4520 where a,b,c ...t =coefficient are known; there are 20 such equations, is it possible to solve the equation and to find out X1 to X20 value through any software ? How ...
  7. DDSpetro

    VGOHT Feed Filter Pressure Drop

    Yes, it is backwashable filters with 23 elements. Another theory is about conjugated olefin i.e.Polymerization of diolefin.which is another potential factor.To analyze this, should the material/sample of filter while open can be better to do TOC test or Thermography analysis - TGA would be better ?
  8. DDSpetro

    VGOHT Feed Filter Pressure Drop

    Dear all , The VGO Hydrotreater feed filteration system is facing problem of higher pressure drop , The feed is the mixture of Heavy vaccum gas oil,Light Vaccum gas oil and Heavy Coker Gas oil.The culpit is seen the quality of Heavy Coker Gas oil.Whenever, Coker unit,Ratio of HCGO Hot wash /...
  9. DDSpetro

    High Inorganic Chloride salt n LVGO

    Any negative implications by increasing 10 % LVGO cut point ?
  10. DDSpetro

    High Inorganic Chloride salt n LVGO

    Pl. find here with the attached file of lab analysis.LVGO 5 % SIMDIST remains 301 C while LVGO 10 % SIMDIST remains 321 C ; I was thinking whether based on this lab analysis , increasing 10 % cut point of LVGO will help as minimum cost option ; one is that CaCl2 in desalter downstream can be...
  11. DDSpetro

    High Inorganic Chloride salt n LVGO

    With 10 % distill of LVGO sample, Out of total 6 ppm of LVGO Chloride sample, 4 ppm has come in to that 10 % recovery.
  12. DDSpetro

    High Inorganic Chloride salt n LVGO

    25362 ,Yes, LVGO Chloride is very well correlating with Crude TAN - 80 % positive correlation as attached. Further in Lab , one more experiement is done without water wash as such there was 6 ppm chloride with no free water. With 5 % water wash and centrifuge of LVGO sample further chloride...
  13. DDSpetro

    High Inorganic Chloride salt n LVGO

    no correlation found as posted earlier,pa return flow has correlation as since last two days without doing lvgo chloride has come down with pa return temp of 39 c ,chloride is 3 ppm in both units.if we put higher caustic then stochiometry,is it possible it can carry foreword and helps cacl2...
  14. DDSpetro

    High Inorganic Chloride salt n LVGO

    In previous post V-12 is Crude atmospheric column overhead reciver boot water ; caustic batch is prepared once in a day.
  15. DDSpetro

    High Inorganic Chloride salt n LVGO

    786392- It is Merry Crude type ( 20 wt % in the blend) it is venezulen crude - High Metal crude with As is also there in it. 25362, Caustic dossing vessel is having gear pumps with one standby pump, its discharge goes to booster pump suction / slip stream of desalter downstream section : Two...
  16. DDSpetro

    High Inorganic Chloride salt n LVGO

    i wil post physical observation soon on caustic injection,meanwhile today it was observed surprisingly,unit 1 where lvgo PA return temp was 48 c,col top temp 41 c,lvgo total chloride was observed 2.7 wtppm ,unit 2 lvgo PA return temp 39 c,top temp 33 c,lvgo total chloride 3.4 wtppm,unit 2,boot...
  17. DDSpetro

    High Inorganic Chloride salt n LVGO

    25362, Chloride was analysed in 6.6 % caustic but it was 8 ppm only; if we consider 350 liter/hr dilute caustic of 3 % concentration then based on 1090 kg/m3 density;pure Caustic flow will be ~ 11 kg/hr & desalter outlet salt which remains 0.6 to 0.8 ptb max. ( 1 ptb = 3 wtppm salt) ; assuming...
  18. DDSpetro

    High Inorganic Chloride salt n LVGO

    OK, On internet, I have found out some Pxy,Txy graph as well as Azeo at low pressure @ Vaccum colum pressure i.e.24 mmHg top pressure as attached. http://www.me.gatech.edu/energy/andy_phd/two.htm#f210 Can you pl. guide if it will helpful to control chloride in LVGO...
  19. DDSpetro

    High Inorganic Chloride salt n LVGO

    u r right 786392, 25362- ok ,meanwhile,i hv seen caustic injection quill is of alloy steel in the direction of crude flow,270 to 350 liter/hr diluted caustic ~ 3 % from 6.6 % ,no choking in nozzle ,(location in d/s of desalter ) & stoichiometry wise ok to nulify it as cause; high acid treatment...
  20. DDSpetro

    High Inorganic Chloride salt n LVGO

    crude unit return condensate conductivity remains 2.8 MICRO OHM,So, possibility of chloride,Na can be eliminated.further it has been seen that incoming 45 % Caustic has only 50 ppm NaCl,further it gets diluted up to 6.6% with condensate and further in plant with non phenolic striped water but 20...

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