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Curvaceous Visual Explorer offers a scientific method to find consistent high/low alarm limits for many variables at a time.

Alarm management has always been difficult because of false alarms, standing alarms, high annunciation rates and alarm floods.

At the root of all these problems are the values at which the alarm limits are set.

In many plants, values are set based on the opinion of the most vocal one variable at a time.

There are a few isolated examples based upon strength of materials, but the values found are usually so far out from where the plant operates that they are better considered as safety limits than operating limits.

Visual Explorer removes bad actors and most false alarms at a stroke giving an immediate reduction in the all-important annunciation rate.

The Curvaceous Hi-Lo limits are usually tighter than other alarm limits because the elimination of most of the false alarms automatically reduces the annunciation rate.

Tighter alarm limits give the operator more time to react and improve process safety by catching process upsets while they are smaller and can therefore be corrected more easily.

Then, the Curvaceous Process Modeller is used to generate operator alerts to help the operator stay away from the high/low limits.

It uses the operating envelope formed by the fixed Hi-Lo limits to account for interaction between variables.

The alert limits change continuously, which is why they were so impossible to set to fixed values in the past.

Curvaceous Process Modeller shows them to the operator pictorially.

Adhering to the alerts will further minimise the number of Hi-Lo limit alarms, reducing the probability of failure on demand.

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