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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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
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...
Hello Everybody:
I post a question in Control section on pH control problem. Looks like that group is not that active. Can you visit Controls section and reply?
JBando
Hello there:
F1 ! F1 !
Help ! Help !
I am trying to tune a PID conroller for a pH control system.
the inlet stream comes at pH=1.5-2.5, and caustic is added to get a pH = 6.5 (ideally 7.0, but I will refrain to discuss about that right now). I have a Equal % Open Control valve, and the Tanks...
Dear Mark:
I saw your post only today.
You are right, COMPAQ VISUAL FORTRAN is your only choice.
I do not know exactly waht type of Fortran you will be migrating, but I am sure you will have all compatibility in newer Fortran. But the SYNTAX might be different.
Furthermore, if your Fortran is...
Hi Camarena:
There are two topics you are talking here:
1. Liquid-Solid & 2. Gas-Liquid-Solid
If you are designing Fixed bed, I can assume that you are doing catalytic application or adsorption. Depending on your application, design will vary. However, in general, when you are dealing with...
A quick answer:
Now, you have to buy what is know as COMAPQ VISUAL FORTRAN, now version 6.x (x =not sure).
However, if you do not use lots of library routine, and your programs are not exhaustive calculations, like solving ODE/PDE using IMSL or so, you are free to go ahead with VB/VBA. In fact...
