Petrochemical Plant - Flare Event Problem • Pressure difference was growing for control valve. How SAM GUARD Helped • SAM GUARD identified a discrepancy between the opening position of the sensor, the set point, and the level. While the opening position declined, the other two remained stable. • SAM GUARD alerted initially on Oct 20, 03:07 and then again on Oct 22, 15:39. • The shift manager investigated the first reported event and added a note on Oct 21, 2019 00:34 saying: “pressure difference is growing. Suggest to check column level sensors.” • The senior engineer was asked to further investigate the event which eventually was affirmed and classified as “bad sensor.” Value • Several years prior to implementing SAM GUARD, a similar occurrence generated a huge flare event. •

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