Re: [foxboro] Steam FLow Calc
- From: Gregory A Hurwitt <hurwitg@xxxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 20 Apr 2005 09:44:49 -0500
Loyd, your example implements the typical P/T compensation based on the
ideal gas law. Again, while this is better than no compensation at all, it
is not very accurate for steam.
Greg Hurwitt
BASF Freeport
|---------+------------------------+---------------------------->
| | |"Loyd Greer" |
| | |<LGREER@xxxxxxxx> |
| | |Sent by: |
| | |foxboro-bounce@xxxxxxxxxxxxx|
| | | |
| | | |
| | |04/20/05 09:32 AM |
| | |Please respond to foxboro |
| | | |
|---------+------------------------+---------------------------->
>---------------------------------------------------------------------------------------------------------------|
| To: foxboro
|
| cc:
|
| Subject: Re: [foxboro] Steam FLow Calc
|
>---------------------------------------------------------------------------------------------------------------|
|---------+------------------------+---------------------------->
| | | |
|---------+------------------------+---------------------------->
>---------------------------------------------------------------------------------------------------------------|
|
|
>---------------------------------------------------------------------------------------------------------------|
Brian,
I don't know if this will help or not but here is a copy of a block that I
got from Foxboro. It Compensates for temp and press.
[snip]
>>> blong@xxxxxxx 04/20/05 09:28AM >>>
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
|---------+------------------------+---------------------------->
| | |"BrianLong" <blong@xxxxxxx> |
| | |Sent by: |
| | |foxboro-bounce@xxxxxxxxxxxxx|
| | | |
| | | |
| | |04/19/05 04:56 PM |
| | |Please respond to foxboro |
| | | |
|---------+------------------------+---------------------------->
>---------------------------------------------------------------------------
------------------------------------|
| To: "Foxboro"
|
| cc:
|
| Subject: [foxboro] Steam FLow Calc
|
>---------------------------------------------------------------------------
------------------------------------|
|---------+------------------------+---------------------------->
| | | |
|---------+------------------------+---------------------------->
>---------------------------------------------------------------------------
------------------------------------|
|
|
>---------------------------------------------------------------------------
------------------------------------|
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
_______________________________________________________________________
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
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
_______________________________________________________________________
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
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
_______________________________________________________________________
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
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
_______________________________________________________________________
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
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
