Determining plant equipment performance is customarily based on steady-state operating conditions. In fact, standards such as the Power Test Codes1 go to great lengths to define what is considered steady-state for determining equipment performance.
Most modern data acquisition systems have algorithms for determining plant equipment performance based on real-time data. In general, these algorithms are based on steady-state assumptions, even though the process may be operating under transient conditions. Hence, there should be concern in the accuracy of computing plant equipment performance during transient operation.
The confidence that can be placed on the accuracy of plant equipment per
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