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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 744409 - Overcome By Hydrogen Sulfide

Accident: 744409 -- Report ID: 0951510 -- Event Date: 02/08/1993
InspectionOpen DateSICEstablishment Name
10587523103/16/19934911Cosi Puna Inc
THREE ELECTRIC UTILITY EMPLOYEES WERE INVOLVED IN A GEOTHERMAL DRILLING OPERATION. THEY WERE PREPARING A WELL CLEAN OUT OF KS-9, WHICH INCLUDED A 4-HOUR VENTING. THE STEAM USED IN THIS OPERATION IS NORMALLY ABATED WITH THE USE OF CAUSTIC SODA IN THE ATMOSPHERIC SEPARATOR AND MUFFLER SYSTEM. HOWEVER, DURING THIS PARTICULAR OPERATION, CONDENSATE FOLLOWED BY A CLOUD OF UNABATED HYDROGEN SULFIDE CAME OUT OF THE SAMPLE PORT. TWO EMPLOYEES WERE OVERCOME BY THE GAS. ONE OF THEM HAD BEEN STANDING NEAR THE THROTTLE VALVE, AND THE OTHER HAD BEEN MONITORING HYDROGEN SULFIDE FROM A NEARBY LOCATION.
Keywords: unconsciousness, hydrogen sulfide, venting, well
Employee # Inspection Age Sex Degree Nature Occupation
1 105875231 Non Hospitalized injury Poisoning(Systemic) Production samplers and weighers
2 105875231 Non Hospitalized injury Poisoning(Systemic) Production inspectors, checkers and examiners

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