In 1994, a fatality caused by exposure to hydrogen
sulfide occurred at a refinery. The accident occurred while draining
of a fuel gas knockout drum in a hydro treating unit. Normal work procedures included periodically opening a valve
that carried a water-gas mixture to a separator which removed and vented
hydrocarbon gases to a flare. During the preceding winter, the piping
to the separator froze, and the drum was temporarily drained to the
sewer. This deviation went unnoticed and the temporary
practice of draining to the sewer continued. On the day of the incident, the operator opened the valve to the sewer believing it to be part of the draining
procedure, resulting in the release of toxic amounts of hydrogen sulfide
that killed the operator.
Source: osha.gov
Contribute to the surviving victims of Bhopal by buying my book "Practical Process Safety Management"
Source: osha.gov
Contribute to the surviving victims of Bhopal by buying my book "Practical Process Safety Management"
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