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Recent content by JBando

  1. JBando

    Nelson Diagram in Excel

    Hello: I am wondering if any one has developed the Nelson curves in Excel? Please let me know Thanks, Bando
  2. JBando

    I need 3.6 not 3.5999

    Hello: Just try this for Format F3.1, this should take care of it Thanks
  3. JBando

    VAX-VMS File to PC Fortran....Help!! F1...

    Hello there: I have a FORTRAN program written and ran in VAX-ALPHA machine. Now, I need to convert the Program to PC Fortran (COMPAQ-Visual Fortran). My problem is as follows: The Alpha version uses RANDOM ACCESS FILE, but with no FORMAT STATEMENT. The Problems are ran and stored in Record Set...
  4. JBando

    h2 unit prereformer catalyst regeneration

    I think 4 years is a good life as such. Ofcourse, depending on you GHSV ( are you in the range of 15000 Hr^-1?) Well, one of the benefits of pre-reformer is to reduce S/C ratio (at least I would like to claim that way), besides utilizing lost energy in the convection section. I fail to...
  5. JBando

    h2 unit prereformer catalyst regeneration

    Hi Santosh: As far as I know, you can not regenerate Pre-Reformer catalyst. You may contact catalyst vendors about the regeneration. as this catalyst is an expensive one, it will nice to regen. Just out of curiosity, what is the catalyst life you are getting, and what is the SV you are using...
  6. JBando

    typical D/L of tubular reactor

    I very much agree with Montemayor. Depending on your applications, L/D (or D/L- as you mentioned). I will give some rough guidelines: here I will interms of L/D (so if you are using D/L, invet the values): For G-S reaction, if your catalyst crush strength is not a problem, then L/D = 5-6...
  7. JBando

    Kinetic subroutine for Aspen plus

    Rmendivil: You mentioned that you have checked Aspen documentation, and did not work. Make sure that the Aspen version (the software) and the documentation you are following are the same. Best thing will be, print the PDF Help file for the USER DEFINED SUBROUTINE. There you will find Exactly...
  8. JBando

    Visual Basic v Fortran

    Well, there are some other issues: Fortran has got hugh - I mean HUGH library routine available. Fortran is ment for heavy duty computation. Furthermore, some the Standard Routine ( if you do any Numerical methods then you may be aware IMSL- International Mathematical and Stat Lib, etc) are not...
  9. JBando

    pH Control

    Thanks.. Assumptions...
  10. JBando

    Does anyone recognize "fac"?

    Also, in addition as Nbucska suggested, Fortran doesnot initiate variable. You do one thing, check the following: In COMMON statement In EQUIVALENCE statement If it is the Main program, it might be calling any Subroutine before that. Check the Argument list passing through all the LIST. Check...
  11. JBando

    Does anyone recognize "fac"?

    Sometimes, during calculation, the developer must be looking some factor which might be interested to him/her. Myself is using Fortran more than a decade, and I can assure there is special syntax which can be concatenated to existing variable and used it in the calculation. May be your variable...
  12. JBando

    pH Control

    Hello Everybody: Well, One setp closer to perfect situation: I am ordering a retractable pH probe for measurement. Also, changing the Valve Trim for finner control. As of now, I am able to control close to 6.55-6.75. i really appreciate your help, and suggestions. Assumptions, I will see if I...
  13. JBando

    Arrhenius equation

    Hold On..... Fellows... DO NOT CONFUSE THERMODYNAMICS with KINETICS Which most you have Done!!!. AGAIN DO NOT CONFUSE. ENDO or EXO-thermicity is a THERMODYNAMIC PROPERTY for the species involved, and it depends on the HEAT of FORMATION (say Delta H = DH_p - DH_r, I will not explain it here, if...
  14. JBando

    pH Control

    Hello Everybody: I had to change the valve trim. And i noticed that the dead time of the system was too high. So I am getting a retractable probe, and place it in the tank (earlier it is in in the Exit line. Let see- I will keep you posted the update. Thanks for your help. Jay
  15. JBando

    pH Control

    Thanks for your input Hacksaw & RGcook. I will implement your suggestions in the coming week. I will keep you posted. Hacksaw, in fct we are implementing the strategy for tighter control go get PV=7.0. For that purpose, we are instaaling the new tank to do the great amount of job, and do the...
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