Re: [foxboro] flowrate

We're trying to establish a flake (flow rate at which a reactor is
emptied) rate. All we have to go on is the weight of the reactor (ain)
and a timer and/or station time. The ind blocks we're using now are
working, but they only give a very rough indication. Our process does
not really allow installation of flow measurements. I was woundering if
anyone had figured out a more accurate way of establishing accurate flow
rates without using flow measurement

Our calculations look somewhat like this:
Collect begin weight, start timer 60sec's, wait until timer elapses,
collect endweight, subtract endweight from beginweight, multiply by 60,
this gives us a new average flake rate per hour, refreshed every minute,
it's OK for the larger volumes, but not accurate enough for the small
volumes.

Rgds,

Dirk

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Jones, Charles R. (Chuck)
Sent: vrijdag 14 juli 2006 15:33
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] flowrate


Dirk,
I'm not sure I understand.  Could you clarify a bit?

You do not have flow measurements, but you are using AIN blocks and
averaging values every five minutes.  What values are coming in through
your AIN blocks?

Are you trying to get a running five-minute average flow rate?


Chuck Jones
Automation Technologist
Tate & Lyle -- Lafayette South Plant
765.477.5324 - Office  | 765.586.5290 - Cell




-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Pauwels, Dirk - RSM
Sent: Friday, July 14, 2006 9:14 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] flowrate


We haven't got any flow measurements, but we're using ain and ind blocks
to calculate a flowrate. We take value snapshots every x sec's and
calculate average every 5 min's or so. This is not accurately enough. Is
anyone of you using some accurate calculation to accomplish this? I've
been experimenting with accum blocks, but can't get an acceptabel
accurracy
=3D20
Thanks & Rgds,
=3D20
Dirk Pauwels - DCS/MOC coordinator=3D20
Engineering dept.
Hexion Specialty Chemicals
E mail: dirk.pauwels@xxxxxxxxxxxxxx
T=3D2E  +32.(0)3.570.95.97
F=3D2E  +32.(0)3.570.16.09
Mob. +32.(0)497.428.300
=3D20
=3D20
=3D20
_______________________________________________________________________
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
=3D20
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:
mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Djoin
to unsubscribe:
mailto:foxboro-request@xxxxxxxxxxxxx?subject=3D3Dleave
=3D20
************************************************************************
***=3D
**************************
This email and any files transmitted with it are confidential and
intended =3D
solely for the=3D20
use of the individual or entity to whom they are addressed. If you are
not =3D
the intended=3D20
recipient or the person responsible for delivering the email to the
intende=3D
d recipient, be=3D20
advised that you have received this email in error that any use,
disseminat=3D
ion,=3D20
forwarding, printing, or copying of this email is strictly prohibited.
If =3D
you have received=3D20
this email in error please notify the sender immediately. Please note
that =3D
we reserve=3D20
the right to monitor and read any emails sent and received by the
Company i=3D
n=3D20
accordance with and to the extent permitted by applicable legal rules.
************************************************************************
***=3D
**************************
=20
=20
_______________________________________________________________________
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
=20
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         =
mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin
to unsubscribe:      =
mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave
=20
 
 
_______________________________________________________________________
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:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave

Other related posts: