I am trying to incorporate a safety functionality to detect if a manual valve is open or closed at a valve manifold. Can anyone offer some guide as to how this can be done?
The process control system used for this is a Delta V system. And there are flow meters. The fluid in the pipes are either single, two or three phase of Air, Water and oil. The are some flow meters downstream on each of the lines.
Hi
You can install Fisher 4320 Wireless Position Monitors on the manual valves to determine the position.
In addition to updating about open or closed position, this device can also help you to detect in case the valve is not fully closed or not fully open.
Ease of installation (mounting kits available for major valve vendors and can be customized) and
no need to run new wires (battery operated device) will be advantageous for you.
You can learn more about the device at the below link
www2.emersonprocess.com/.../4320.aspx
There are users that have successfully used Fisher 4320 Wireless Position Monitor for similar purpose.
One such success story can be read at the below link
www.documentation.emersonprocess.com/.../d351818x012.pdf
I hope this information would be helpful for you.
Regards
Hi Khan, Thanks alot. This is really helpful. I would get back to you in case I need more clarification
In reply to fahimself:
This is a promising application of technology. it seems the mechanical mount for this equipment must be carefully engineered, and will be very specific to the existing valves you plan to add this to?
One of the low tech and low cost ways to do this would be install two limit switches - one for open and one for close - positions of the manual valve. You may have to get one (or two) brackets fabricated and have the limit switches mounted on these brackets. Wire these limit switches to discrete input card channels. In the beginning you may need to adjust the brackets and limit switch positions so that you can see a open/close coming back to the DeltaV screen without any chatter when the valve is in fully closed and fully open positions. That will give you confirmation on DeltaV screen of whether the valve is open or closed. This is fairly easy to do and works well.
In reply to Kris Chandrashekar:
The "low cost" comment that I made assumes that you may already have some existing/spare wires available or the distance from manual valve to DeltaV D.I. module is short enough to run new cables without too much cost. Fisher 4320 wireless position monitor suggestion may be another option provided you already have a wireless gateway on your DeltaV system. Other wise purchasing a gateway along with position monitors might turn out to be another expense.
Thanks alot Kris, I would have this in mind. Thanks again!
You need to purchase a 1420 Smart Wireless Gateway to gather data from the Fisher 4320 Wireless Position Monitor devices and pass to the control system.
Please note that one 1420 Smart Wireless Gateway can cater upto 100 wireless devices!
You can read further about the 1420 Smart Wireless Gateway capabilities at the below link
www2.emersonprocess.com/.../SmartWirelessGateway.aspx
You can learn more about Emerson Smart Wireless at the below link
www2.emersonprocess.com/.../WirelessHomePage-Flash.aspx
You can check first if there is a mounting kit already available for the size, model and brand of the valve you are using in your plant. As I wrote earlier, we already have predesigned mounting kits available for major valve brands.
In case it is not available, a new mounting kit can be custom made for your need.
I hope this would help you better understand about the feasibility of the technology.