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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