Re: [foxboro] Control loops per operator

  • From: "Perez, Claudio" <CPerez@xxxxxxxxxxxxxxxx>
  • To: "'foxboro@xxxxxxxxxxxxx'" <foxboro@xxxxxxxxxxxxx>
  • Date: Tue, 6 Jul 2004 14:51:47 -0300

Thanks Tom, for your reply.=20
I agree with you, this is a very good forum to exchange our ideas.


-----Mensaje original-----
De: tom.vandewater@xxxxxxxxxxxxxx =
Enviado el: Martes, 6 de Julio de 2004 12:48
Para: foxboro@xxxxxxxxxxxxx
Asunto: Re: [foxboro] Control loops per operator

        There is a lot of discussion as to whether or not using a loop count
or # of controller count per operating technician is an effective way =
measuring technician utilization but I know it varies widely based on =
amount of control coordination and automation installed and it also =
makes a
big difference as to whether the processes are continuous like many
distillation trains, or batch like many reactor systems.  I have an =
easy way
to document how many analog controllers, (such as PID, DGAP, PTC), each =
our operators are controlling and it ranges from 148 to 246 per =
technician in our plant.  That doesn't include any of the discrete
controllers used for discrete valves and motors but I have found that =
discrete functions are generally twice the number of the analog =
for our processes so you can do the math.  I would be interested in =
comparisons from other plant operations throughout the world and this =
is a
great forum for it.
        Via automation over the years the number of board operating
technicians required to run the plant has been reduced.  This can allow =
freed up resources to focus more on improving the reliability of the =
equipment via increased preventive maintenance activities.

Tom VandeWater
Control Systems Developer/Analyst
Dow Corning Corporation
Carrollton, KY  USA

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Perez, Claudio
Sent: Monday, July 05, 2004 11:25 AM
To: 'foxboro@xxxxxxxxxxxxx'
Subject: [foxboro] Control loops per operator

        Do somebody have some figures about the right number of operators
per control loops (pid, hand controls, i/o, etc). Is there some =3D
standard to
follow? Till now I couldn't find good information.

Thanks in advance.

Claudio A. Perez
Control Systems Eng.
(54) 291 459-8139

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