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Recent content by sheiko

  1. sheiko

    Standard flowrate of individual component in gas mixture

    Latexman Sorry but I believe 75% is not the volume fraction at standard condition but at actual condition (lab measurement). Maybe it looks a 9th grade question but sometimes things look obvious but are not. I remember from school that gas composition change with T and P...so what if 75% vol...
  2. sheiko

    Standard flowrate of individual component in gas mixture

    Thanks So Zdas says mass fraction and latexman says volume fraction. I need more feedback please @Latex Shall I use volume fraction at standard conditions so?
  3. sheiko

    Standard flowrate of individual component in gas mixture

    Dears I would like to have a confirmation here: Suppose I have 1000 Nm3/h of gas containing 75% vol of hydrogen (or around 2% mass). If I want the flowrate of pure hydrogen in Nm3/h, shall I multiply by the hydrogen mass fraction or volume fraction? TO me it is clear that Nm3 (standard volume)...
  4. sheiko

    EN ISO vs API

    Good day, I am researching the EN ISO equivalent to: API 650: storage tanks API 2000: atmospheric storage tanks API 560: fired heaters API 660: shell and tube heat exchangers API 661: air-cooled heat exchangers API 674: positive displacement pumps, reciprocating API 675: positive displacement...
  5. sheiko

    Centrifugal pumps alarms and trips

    Thanks Discussing with the reliability guy, I have learnt that PAL and PSLL on discharge side aims at limiting flowrate above 10-20% of BEP. In fact, only PT were available on currect pumps when decision to install additionnal safety loops has been taken. So the choice to install PSLL instead...
  6. sheiko

    Centrifugal pumps alarms and trips

    Hello everyone I was wondering if there is any standard or recommended practice regarding typical alarms and trips to be implemented around centrifugal pumps? The reason is: in the refinery I am working in, I see plenty of alarms and trips that I don't see the purpose. For exemple, on pumps...
  7. sheiko

    Heat exchanger performance problem

    Ione thanks but I am not talking about fouling factors. I do know what it is. Please read srfish answer to understand what I mean. @Lionel_Sheiko / geniechimiquefacile.com
  8. sheiko

    Heat exchanger performance problem

    Guys I have an additionnal question if you allow me. During the design stage of a new heat exchanger, temperature cross (hot outlet minus cold outlet is negative) means low F which in turns means that some part of the surface is useless (no heat transfer). so why during operation (once the...
  9. sheiko

    Heat exchanger performance problem

    Thanks But it's not MY success.. I have just noticed that (the only one unfortunately). @Lionel_Sheiko / geniechimiquefacile.com
  10. sheiko

    Heat exchanger performance problem

    Thanks Dale Do you mean a decrease of F means better performances? @Lionel_Sheiko / geniechimiquefacile.com
  11. sheiko

    Heat exchanger performance problem

    Additionnal data: C = crude D = diesel I = in O = out M = mass flowrate Cp = specific heat Before shutdown: Tci = 152C Tco = 205C Tdi = 280C Tdo = 219C Mc = 47.5 t/h Md = 37.9 t/h CPc = 0.62 CPd = 0.68 After shutdown: Tci = 143C Tco = 207C Tdi = 272C Tdo = 186C Mc = 45.7 t/h Md = 32.8 t/h CPc...
  12. sheiko

    Heat exchanger performance problem

    Hello The performance of one of our shell and tube heat exchanger has changed in a significant manner. The service is crude oil in the tubes and diesel in the shell. It has 1 shell pass and 4 tubes passes. Tube side equipped with turbotal Surface is 197 m2. Before a shut down, performance...
  13. sheiko

    Suggest some technical Books

    Books by Norman Lieberman for sure. @Lionel_Sheiko / geniechimiquefacile.com
  14. sheiko

    Conventional RV outlet losses above 10%

    Max. allowable backpressure = 1.21*MAWP - Pset for fire case Max. allowable backpressure = 1.10*MAWP - Pset for non-fire cases "We don't believe things because they are true, things are true because we believe them."
  15. sheiko

    level gauges

    Hi, This is not a student question at all. It is such an important subject that Norman Lieberman has devoted a whole chapter about this in his new book "Process Equipment Malfunctions". The main reason for the discrepancy between the real level and the level gauge indication is density. In...
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