Tag Archive: valve

Dec
12

Maximizing the Return on Your Control Investment – Part 1

At Emerson Exchange, 2011, I had the pleasure of working with James Beall, Principal Control Consultant, Emerson Process Management to host a workshop that addresses how to get the maximum return from your control investment. The design and commissioning of the controls associated with a continuous or batch process directly impact plant operating efficiency and …

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Aug
08

Commissioning Control Systems – Installed Characteristics

From a control perspective, it is highly desirable that the process gain be constant. If the process gain is constant, then the same proportional gain may be used over the entire operating range of the control loop. However, if for example the valve characteristic has not been selected based on the process requirements, then the …

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Aug
01

Commissioning Control Systems – Resolution and Deadband

As addressed in my July 18th and July 25th blogs, to achieve best control performance, it is important that the final control element moves to a position that matches that requested by the control system. The minimum size of change in the PID output that the control element can respond to can be quickly confirmed …

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Jul
25

Commissioning Control Systems – Valve Performance

As addressed in my July 18th blog, when a valve positioner is installed on a valve actuator, as long as it is functioning properly it will automatically increase the actuator pressure until the valve moves to a position that matches that requested by the control system. Feedback of the stem position is used by the …

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Jul
18

Commissioning Control Systems – Valve Positioners

When commissioning a control system, it is important to be aware of whether a regulating valve is equipped with a positioner. If a valve does not have a positioner, then as part of loop commissioning it may be necessary to install a positioner on the valve to achieve the desired control performance. For various reasons, …

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