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What type of DCS to Chose?
Comparison of available DCS types for chemical process controlling

Which DCS to chose for formaldehyde and resin production?

Main information:
- HART was used for all control equipment (valves, transmitters and etc) used analog signal.
- Basic open/close valves used discrete signal.
- MCC and all drives soft-starting equipment used profibus and simacode of Siemens.
Used equipment (and probably is going to be used):
- Emerson (transmitters , sensors)
- ABB (drives, pumps)
- Siemens (dosing machines)
- ABB, EATON (CB and other protection devices)
Previous installed was DeltaV. Now proposed are ABB, Yokogawa, Siemens.

What you can suggest ? Which one is better, cheaper?

Thank you!

Why in the world would you want to replace a DeltaV control system? With the information supplied, I would try to use the DeltaV and expand it where necessary. You do not indicate if this is a batch process, but I assume it is. Emerson has excellent batch software for the DeltaV. There is nothing wrong with any of the other systems, but if you want a supplier to assume total responsibility for the system, then either use a local system integrator, or Siemens, which has a history of taking full responsibility, but is not cheap.

I'm not sure it is batch system or not. But something is went wrong with it. I've just entered the project and need to modificate existing plant and shortly "switch DeltaV for another one". Priority are cheaper, easy commissioning.

I'm open for any suggestions or questions.

Thank you!

I presume that you have Delta V in your existing plant and are adding those 2 new plants?

I would recommend that you use Delta V again. It is what you know and it is as good as or better than your other options.

All new DCS systems like Delta V or Experion PKS have a similar cost.
The extra cost of supporting 2 different DCS platforms should also be avoided.

good luck

Not exactly. New plants ain't gonna be connected with the previous two. Moreover, different DCS have been implemented in different plants.

So, supporting costs are not expected.

Last time ABB, Siemens and Yokogawa were suggested, but Honeywell and others are not eliminated . That's why I'm asking which one do you think is cheaper, easy operating and maintained. Or with which one you've got previous experience.

Thank you!

There are no significant differences in cost among any of the DCS suppliers you named. All of them compete with each other. They are all easy to use, if you take their training programs, but they are different. Most of the users I know, use either Emerson DeltaV or Honeywell Experion. Dow Chemical has standardized on ABB x800A. But all of these are in North America. Local support means a great deal.

Most of the small batch chemical plants in North America use Rockwell's Process Logix with their batch software. They tell me that they save money this way.