One task changes another: The DuPont La Porte methyl mercaptan release
Four workers died in the 15 November 2014 DuPont La Porte release. CSB reported that a pressure problem thought unrelated was connected to pipe-clearing work.
Understand the situation
A blockage-clearing task and an abnormal pressure elsewhere can appear unrelated. The La Porte case illustrates how work on a connected system can change another crew’s assumptions.
Review the task
CSB describes multiple shortcomings, including design and safeguards. Reducing the event to one worker or one permit loses that system context.
This account stays within the agency’s final-report release.
Check your workplace
- Did another crew change the system?
- Where does the drain discharge?
- Was abnormal pressure shared?
Apply the lesson
Our application is to map connections and discharge destinations across job boundaries. Share abnormal pressures, temporary actions and draining work with operations and affected crews.
Avoid a common mistake
Ask how a team learns that another activity has changed its conditions. Do not assume your plant matches the incident geometry; examine its own connections and communication gaps.
Putting it into practice
Map connecting pipes and discharge routes across permit boundaries. Do not reduce the event to an unsupported claim that no permit existed.
Technical insight
Connect leak response to work control
An abnormal release can change a routine task into a different operation. Reassess the substance, flow paths and exposure instead of continuing under assumptions made for normal conditions.
For local learning, separate access to assess a leak from maintenance to stop it. Identify who restricts access and which conditions must be established before repair begins.
Korean safety resources
- KOSHA · Safe work guide for preventing confined-space asphyxiation
Korean-language PDF: permits p.20, safety measures p.24, rescue p.44. Legal references reflect the edition’s publication period.