Reducing Variability for Optimal Plant Performance Experience the Cernay PlantWeb Dynamic Performance Loop
Control loop performance It is well known and documented that control loop performance has an impact on plant performance and hence profitability. If the variability within the process is too high it can lead to scrap, downgrading of product or rework. Often the solution is to move the operating point outside of the most profitable area, even to run the process in manual.
An independent process control consul- teria that can be applied when selecting tancy has accumulated evidence, from a new control valve to ensure it has the years of research that suggests control ability to minimise process variability. valves are the biggest contributor to poor loop performance and the desta- Emerson Process Management have sig- bilisation of product uniformity.
Variability Variability is the statistical difference the operating level variability can between the process variable and cause oscillations leading to process process set point. In a perfect world alarms or plant trips, reduced plant these points would always coincide, capacity and the need to slow the however we know this rarely hap- process down or switch to manual pens and there will always be a operation. degree of variability.
Establish optimum loop performance To ensure any control loop is able to con- All tests performed within Emerson’s sistently perform within required param- laboratories are conducted in accor- eters it is necessary to establish the per- dance with independent test specifica- formance requirements of the control tions , to ensure they are unbiased. valve.
Maintain optimum loop performance Control valve performance will degrade personnel and Emerson diagnostic tech- with Emerson engineers to set the over time so it is vitally important that nicians can be made aware, either by alarms and alerts at suitable levels to procedures are put in place to monitor PlantWeb alarm/monitoring system, ensure they are meaningful.
Retrieve performance to optimal levels Following the identification of a poten- through the FAST service which can tial problem it is necessary to identify supply 90 per cent of routine parts to the specific actions that are necessary European destinations within 24 to retrieve performance to its original, hours. A further 20,000 items are benchmarked level. Often problems available within seven days.
The Cernay Laboratory The Cernay Laboratory includes a flow worked with other Emerson laborato- be tested, on water or air. Tests may be loop and a dynamic performance loop ries located in Asia and the USA to performed to prove a new design, for both of which are powered by share the extensive amount of data research, as part of a product audit, to PlantWeb digital plant architecture.
The PlantWeb Dynamic Performance Loop With its extensive use of the latest dig- tenance capabilities of the instrumenta- ital field devices, systems and soft- tion can be demonstrated as well as ware the PlantWeb dynamic perform- showing how these are used to provide ance loop can be used to prove the maximum benefit. benefits of PlantWeb digital plant architecture.
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