AIChE August 2013 Rev 1

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Process Safety in chevron. case study of piper alpha incident
  © 2013 Chevron Corporation All Rights Reserved Process Safety in Chevron History and Evolution of Process Safety in Chevron  © 2013 Chevron Corporation All Rights Reserved Process Safety Basics What Helps prevent very serious/catastrophic process-related accidents.  Also includes activity-related events with catastrophic potential How  Applies structured, formal management systems to key accident prevention elements, encompassing critical areas of plant design, construction, maintenance and operations  © 2013 Chevron Corporation All Rights Reserved  A Major Incident Viewed From a Process Safety Perspec tive - Piper Alpha  Operated by Occidental Petroleum  Located in North Sea, generated almost 10% of UK oil revenues  On July 6, 1988, burned to the sea, killing 167 people, including two attempting rescue 3  © 2013 Chevron Corporation All Rights Reserved Piper Alpha Sequence of Events  Light hydrocarbon Pump A  isolated for maintenance on day shift. Relief Valve A removed for testing.  Work permits showing out-of-service equipment not clearly communicated to nightshift.  On the nightshift, light hydrocarbon Pump B  shut down and could not be restarted.  Nightshift recommissioned Pump A , without noticing that Relief Valve A had been removed.  Upon Pump A  start, light hydrocarbon was released, followed by an explosion that failed the crude oil export piping.  Fire water pumps were on manual (a safety measure for divers) and could not be activated. Crude oil fire continued until high- pressure gas export piping failed.  With access to muster area blocked, platform personnel gathered in accommodation module awaiting instruction that never came.   A second gas export line failed. 4 A   B Light HC Vessel Light HC Pumps Relief Valves   A B
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