Re: [foxboro] Steam FLow Calc
- From: "Dehler, Glenn SCAN--" <Glenn.Dehler@xxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 20 Apr 2005 13:00:15 -0600
Not to sound like a broken record, but the (new) flow compensated =
package available from Foxboro Canada will provide steam density and =
enthalpy (saturated and superheated) as well as water density and =
enthalpy (as one of it's outputs).
It does use the Foxboro Physical Properties package for the steam and =
water properties but had a very nice "wrapper" on it. The results are =
connectable to (say) CALCA blocks for allow the density to be combined =
with orifice plate, nozzles, vortex, etc. meters to get your corrected =
mass flowrate.
May be worth looking into for your issue. Contact is Sylvain Nadeau =
(FoxCan - Montreal)
Cheers,
Glenn
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Matic.Hank
Sent: Wednesday, April 20, 2005 9:04 AM
To: foxboro@xxxxxxxxxxxxx
Subject: 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.=3D20
-----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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| | |"BrianLong" <blong@xxxxxxx> |
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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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This mailing list is neither sponsored nor endorsed by Invensys Process
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your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
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