Re: [foxboro] Steam FLow Calc

I believe that the steam tables are available, but you would need an
application to update the blocks with the correct coefficients.

I suspect that the Power Group must do this kind of thing regularly. I've
copied Jim Canty who manages most of their applications to see if they have
one for this service.

Jim, 

Any advice?


Regards,
 
Alex Johnson
Invensys Process Systems
Invensys Systems, Inc.
10707 Haddington
Houston, TX 77043
713.722.2859 (voice)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx

-----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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