Re: [foxboro] Steam FLow Calc

If you want the flow with density compensation you get this data if you
the physical properties library loaded on your system you can get the
density from that , you will need to write C program to get this data ,
so you might just as well do the entire thing in that program.=20

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of BrianLong
Sent: Wednesday, April 20, 2005 9:29 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Steam FLow Calc

yes, I should have mentioned I need compensation.  Using CHAR blocks is
a good thought and I may try that.  It will most likely be better than
what I'm doing now.  Not sure Foxboro offers, Alex?

Thanks,Brian

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Gregory A Hurwitt
Sent: Wednesday, April 20, 2005 8:18 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Steam FLow Calc


Are you doing mass flow compensation?  If so, are you doing it with the
standard compensation term: sqrt ((P/P0)*(T0/T))?  This compensation
equation is based on the ideal gas law, and steam does not make a good
ideal gas.

For steam mass flow compensation we have on occasion done a "two-way"
characterization where we set up two CHARC blocks to give separate
compensation factors for pressure and temperature over a range of
interest.
It's cumbersome, and it's only accurate over a limited range, but it's
better than ideal gas compensation for steam.

Does Invensys still offer a physical properties package for I/A?  Does
it include compensation factors for steam?  This might be a good
solution.

Greg Hurwitt
BASF Freeport



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We are using a CALC block to calculate steam flow.  The calculation is
not as accurate as I'd like.  Does anyone have an accurate "standard"
way to calculate steam flow in K# / HR.
Thanks,
Brian Long
Arkansas Kraft









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