ISA Certified Control Systems Technician (CCST) program

CCST

Certified Control System Technicians (CCSTs) calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables.

CCST question

Which of the following is most typical regarding loop diagrams?

A. They are relatively inexpensive to produce.
B. They are produced on an as-needed basis after the plant is running.
C. They show both the minimum and optional items that are required.
D. They are typically developed by a company's engineering staff.

CCST Answer

The correct answer is B, “They are produced on an as-needed basis after the plant is running.”

Some plant owners do not believe that loop diagrams are worth their cost (which can be considerable), and they are not typically included in a design package. Therefore, the diagrams are often included on an as-needed basis after the plant is running.

Reference: Goettsche, L.D. (Editor), Maintenance of Instruments and Systems, Second Edition, ISA, 2005.

 

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