Skip to Main Content

An independent federal agency investigating chemical accidents to protect workers, the public, and the environment.

Text Size AA
Emergency Shutdown Systems for Chlorine Transfer
FINAL REPORT: Safety Bulletin
Incident Occurred On: 08/14/2002
Final Report Released On: 06/14/2007
Incident Type: Release


Total # of Recommendations
Total # of Open Recommendations
Total # of Closed Recommendations
Total % of Open 0 vs. Closed 100

investigation information

Incident Description
This bulletin compares two chlorine releases investigated by the CSB. In both, a railcar unloading hose failed and chlorine was released. In the first incident, an emergency shutdown system malfunctioned, resulting in a release of 48,000 pounds of chlorine and a significant community impact. In the second, the emergency shutdown system worked to minimize the release, and the community was not impacted.
Investigation Status
The CSB issued this safety bulletin on June 14, 2007.



U.S. Department of Transportation (DOT)

Expand the scope of DOT regulatory coverage to include chlorine railcar unloading operations. Ensure the regulations specifically require remotely operated emergency isolation devices that will quickly isolate a leak in any of the flexible hoses (or piping components) used to unload a chlorine railcar. The shutdown system must be capable of stopping a chlorine release from both the railcar and the facility chlorine receiving equipment. Require the emergency isolation system be periodically maintained and operationally tested to ensure it will function in the event of an unloading system chlorine leak.

Status: Closed - No Longer Applicable
Closed - No Longer Applicable (C - NLA) - Due to subsequent events, the recommendation action no longer applies (e.g., the facility was destroyed or the company went out of business).

Recommendation Status Change Summary

Related News

CSB follow-up letter to DOT regarding emergency shutdown systems for chlorine railcars
CSB releases follow-up letter to DOT regarding emergency shutdown systems for chlorine rail-cars
read more
CSB Issues Safety Bulletin on Dangers of a Major Chlorine Release During Railcar Unloading; Agency Calls on U.S. Department of Transportation to Expand Regulatory Coverage to Require Emergency Shutdown Systems
Washington, DC, June 14, 2007 - The U.S. Chemical Safety Board (CSB) today released a safety bulletin warning that some chlorine railcar transfer systems lack effective detection and emergency shutdown devices, leaving the public vulnerable to potential large-scale toxic releases.
read more
© All rights reserved