Member Login
Search
Past & Future Posts
Sponsored Communities
Neat Stuff

Visit our shop for nerds in control lifestyle products.
Cool stuff
Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
I fell asleep reading a dull book, and I dreamt that I was reading on,
so I woke up from sheer boredom.
so I woke up from sheer boredom.
RSS Feed
www.control.com/rss
from the Instrumentation department...
Ratio ControlThere is an inlet separator in one of the offshore platforms. It has a level transmitter on it. The discharge line has pumps (3 pumps). Immediately after the pumps there is a flow transmitter. Then there are 3 control valves in parallel. After the 3 valves, the 3 lines meet to form a discharge header. This header downstream is divided into 2 lines going to 2 different locations. Now the discharge to these 2 lines is to be ratio controlled with level transmitter providing the set point. The setup is such that one flow transmitter is immediately after the pumps providing the totalized flow and at one of the branches after the pump header there is the second flow transmitter. What I want to ask is that if I connect the level transmitter such that it provides a set point to the flow tranmitter and the output of the flow controller goes to the ratio controller block and the other flow transmitter is directly connected to the ratio controller block... can the ratio controller provide ratio control to the valves on each branch?? In case this is not possible, what can be done??
From Control Engineering magazine...
Related articles from Control Engineering magazine- OPC: Painless migration, classic OPC DA to OPC UA, partership
- Easier: panel designs, short-circuit current rating compliance
- MechatronicsZone road show kicks off
- ODVA, DeviceNet: New CIP specs; ControlNet added; 2009 meeting
- Partnership: Advanced, interoperable motion control, machine tools
- Protect intellectual property: Encrypt firmware, control code
- Embedded, wireless devices, dynamic IP routing
- Portable computing: Operators can be mobile with rugged HMI
Above articles copyright 2008 Reed Business Information. Subject to its Terms of Use.
Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2008 Control Technology Corporation. All rights reserved.
Users of this site are benefiting from open source technologies, including PHP, PostgreSQL and Apache. Be happy.
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Patronize our advertisers!



