Expert Witness Forensic Engineer Industrial Controls Automation New Orleans
Arthur Zatarain
Project Profile
Industrial Accident: Foundry Conveyor Lockout Tagout
(LOTO) Accident with PLC Controls

Industrial Accident: worker injured while performing non-routine service on a foundry conveyor. Employee used the emergency stop button (E-Stop) rather than the prescribed lockout-tagout (LOTO) procedure to halt the conveyor. The E-Stop disabled normal PLC operation, but did not isolate all electric and hydraulic energy. The isolation of hazardous energy could not be verified without functional PLC controls, resulting in a release of high pressure hydraulic fluid.

Click here for engagement info related to lockout-tagout and emergency stop. An article on control systems for lockout-tagout and emergency stop (E-stop) can be here.

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