4976 Bear Mountain Drive

Evergreen, CO  80439

office: 303-670-8392 

cell:  303-670-9092            

e-mail:  bob@procontrol.net            

 
logo_100wide ProControl, Inc.                   

  Process Control Education and Technology                  

  Robert V. Bartman, Ph.D., President                              

 

 


Before/After Tower Pressure Stability,

achieved by a refinery’s use of Discover

 

The following e-mail and graphics were received unsolicited (in November, 2009) from an advanced control engineer at a major overseas refinery.   This refinery enjoys a sitewide license to ProControl’s ‘Discover’ dynamic modeling and loop tuning software, and routinely sends their advanced control engineers to ProControl’s ‘Revelations in Control’ course.

 

The subject of their e-mail was ‘Discover Testimonial!’ – their words, not ours!  Here’s the main body (there’s a P.S. to come):

 

Body of e-mail titled Discover Testimonial

 

Their attached before/after comparison graphic:

 

Pressure Control Improvement (before-after) 

 

                       

 

There was a P.S. to this e-mail:

 

PostScript of e-mail titled Discover Testimonial

 

Here’s their 2nd attachment, relevant to their ‘Load Disturbance’ P.S.:

 

Pressure Control Improvement (Loads Added)

 

In contrast with the ‘before’ swings in pressure controller OP (orange-ish), the up/down OP changes under Discover’s PID tuning are actually a valid inference of up/down changes in this tower’s vapor rate.