Gross Error Detection with Min/Max Constraints

Gross Error Detection with Min/Max Constraints can detect the stream as gross error even though the reconciled value of the stream may not satisfy the Min/Max constraints, but the measured value satisfies the Min/Max constraints. It is unrealistic, and this option prevents this for more accurate gross error detection.

Example

For example, "GROSS_ERROR_FLOW" stream is detected as gross error if there are no Min/Max constraints of this stream since other streams have good measured values to fit the material balances.

We set the Min/Max constraints in GROSS_ERROR_FLOW stream as 0/10 as shown below and then reconcile again.

The reconciled value of GROSS_ERROR_FLOW stream is set to maximum value (10) and solvability status is Constant Redundant Flow by Maximum Constraint.

But it is unrealistic because measured value of this stream satisfies maximum constraint and if it is not detected as gross error, the reconciled value may satisfy maximum constraint.

The option of Gross Error Detection considering Min/Max Constraints gives a more realistic gross error detection.