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  1. mahmmoud30

    reboiler return below the reboiler draw-out

    dear 25362, thanks very much for ur valuable contribution, i just want more elaboration on the below,if you have a time,: 1- once-through thermosiphon reboilers 2- In these cases, a valved start-up line is generally provided from the bottom of the column. thanks again
  2. mahmmoud30

    reboiler return below the reboiler draw-out

    Hi all regarding the title, it is a naphtha stabilizer column which separate LPG from hydrotreated naphtha with a bottom temp. of 176 deg C at the reboiler draw-out and 190 deg C at the reboiler return. the feed flow into this column is ranging from 24~35 ton/h * my question is why the reboiler...
  3. mahmmoud30

    CCRU H2 compressor failure

    thanks JJPellin for your comments yes we plan to send a sample to a third party lab. to specify the problem. you are right, theoe pictures were taken just as the piston was being extracted from the cylinder. in one of the photos and under the feet of the persons you can see the rubber rings...
  4. mahmmoud30

    CCRU H2 compressor failure

    hi all we face a very strange crack of a reciprocating H2 compressor K-202 @ CCRU which deliver produced H2 to all users. vendor's investigations reveal nothing. any idea or similar case? here is the photos https://picasaweb.google.com/mahmmoud30/ReportAboutK202?authkey=Gv1sRgCIWfla_lxazGlwE#
  5. mahmmoud30

    distillation columns diameter

    thanks a lot mORTEN
  6. mahmmoud30

    distillation columns diameter

    hi all i want to know why 1. Atm. distillation columns have constant diameter from top to bottom while lighter cuts (e.g diesel ,naptha..etc have variable diameter from bottom to top? 2. why some absorbers are wide at top and narrow in the bottom?
  7. mahmmoud30

    vibration sensor reading

    hi all I just want to know why the reading of a vibration sensor is in -ve volts, and could it read in +ve and what is the reference of -ve or +ve? regards
  8. mahmmoud30

    propane-butane equilibrium data

    thanks maddocks for your replay and I'll try to find the mentioned simulator. yes as you said, I use mccabe thiel only for acaimic purposes not actual practice. thanks again
  9. mahmmoud30

    propane-butane equilibrium data

    hi all i want to design distillation column to separate c3 from c4 but i didn't find VLE data so as to apply mcab-thiel procedure.also if there are special design equations regarding the liquified gases please hepl me. thanks alot
  10. mahmmoud30

    Codes and standards

    thanks a lot for both responses and really they are so elaborated and rich
  11. mahmmoud30

    Codes and standards

    Hi all I am a little bit confused about these two terms: 1. codes (e.g vessels design codes) 2. standards (e.g vessels design standards) so plz can somebody explain more!! thanks alot
  12. mahmmoud30

    why using this control scheme??

    thank you dcasto about using DP to detect flooding plz see the attached filehttp://files.engineering.com/getfile.aspx?folder=2cfe4770-954b-4fd1-8965-c3d743b4b648&file=3051S_ASP_Distillation_Column_Flooding.pdf
  13. mahmmoud30

    what this mean?

    plaeas what this unit meaning (te/te diesel)? its written beside the Emission factor in diesel engine emission calculation table.
  14. mahmmoud30

    auxillary lube oil pump not started!!!

    thanks again JJPellin, I'll be back to you after checking with instrument guys.
  15. mahmmoud30

    auxillary lube oil pump not started!!!

    thanks JJPellin for this rich response. we are in a very hot country and this case happed at midnoon. we have local hand-off-auto swith near the aux pump which was in auto mode, is it the same as the auto-start switch that can be set up as latching or not latching or you mean something else...
  16. mahmmoud30

    auxillary lube oil pump not started!!!

    hi all just before 2 days our booster compressor (2stages reciprocating compressor from neuman&Esser)was shutdown du to low low lube oil pressure signal,when we check, we found that auxillary oil pump has autostarted when lube oil pressure was low only but it run for 1 second only then stopped...
  17. mahmmoud30

    why using this control scheme??

    as I promised, the attached pic is a snapshot from the real DCS on july 16th 2009 for the mentioned column.http://files.engineering.com/getfile.aspx?folder=28d3e79b-7484-4e2e-aef4-d2fa8fc169ae&file=stripper.bmp
  18. mahmmoud30

    why using this control scheme??

    Does the graphic actually reflect the control configuration? Yes the scheme is an actual plant under control and operation for 3 years. this snapshot was taken during first configuration and if you like, I will upload the actual DCS snapshot which is the same and with actual operating values. we...
  19. mahmmoud30

    why using this control scheme??

    Mr.Jmw the scheme is an actual plant under control and operation for 3 years. this snapshot was taken during first configuration and if you like, I will upload the actual DCS snapshot which is the same and with actual operating values. thanks for passing over.
  20. mahmmoud30

    why using this control scheme??

    thanks JLSeagull for passing over and appreiate your response. the PDIC measurement is a typical orifice plate that installed at the reboiler furnace outlet line but itsn't reading a flow, it reads PD across that line.

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