Process technicians
have the expected mechatronics skill needed to trouble shoot and repair the
equipment in a process stream and knowledge of the operations of process Final
Control Elements (FCE). A flow valve is a common and ubiquitous FCE in chemical
processes. Often the tech has to select or identify replacement valves based on
process specifications.
In this situation the
Tech is reviewing that documentation with the knowledge that the actual value
in service (in the pipe) is a "Decreasing Sensitivity" valve type. The
other two popular valve types are the Increasing Sensitivity valve type and the
Linear Response type. The Tech is
checking to see if the value in the process is labeled correctly. The tag on
the valve indicates it is Valve 34-a. The technician knows that the valve is
supposed to be "Decreasing Sensitivity" type and understands that for
"Decreasing Sensitivity valves” the change in flow rate compared to the
change in the valve position (stem motion) decreases as the valve becomes
closer to being wide open. The tech also knows that Valve 34-b is a Linear
Response type. In addition, the Tech
knows how to read the valve performance plots shown in the graph below.
The Tech decided that the valve installed in the flow stream
is correctly labeled as Valve 34-a.
YES or NO. Submit your answers
below this blog post, or visit www.fl-ate.org
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