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This data is from the European Hydrogen Incidents and Accidents database HIAD 2.1, European Commission, Joint Research Centre.

Hydrogen Release and Fire at Pipeline Meter Station During Winter Storm
A hydrogen release and subsequent fire occurred at meter station of a pipeline transporting hydrogen to a refinery. Local refinery emergency response team responded and secured the area. The pipeline was isolated, and the fire extinguished itself. During a winter storm, the area was experiencing abnormal freezing conditions and widespread power outages were occurring. As a result, third party hydrogen supply to the refinery was reduced. These upsets resulted in the need to export larger than normal flow rates on the hydrogen pipeline. The incident investigation identified that there was erosion of the flow tubes in the 3-inch Coriolis meter. The initial event led to subsequent failures on the skid including the Coriolis meter housing, meter flange, an 8-inch manufactured elbow, and an 8-inch bypass line. The meter station was redesigned and reconstructed to minimize the risk of erosion. Permanent repairs scheduled were completed after one year.
Event Date
February 15, 2021
Record Quality Indicator
Event Initiating System
Classification of the Physical Effects
Nature of the Consequences
Cause Comments
The initial cause was the failing of a sub-component of a flow meter due to internal erosion. Contributing and/or root causes were the design and the inspection/maintenance schedule.
Facility Information
Application
Specific Application Supply Chain Stage
Components Involved
flow meter
Storage/Process Medium
Actual Pressure
12
Design Pressure
15
Location Type
Location description
Countryside
Operational Condition
Pre-event Summary
The pipeline had been installed in 2017. it was made of carbon steel, with a Max operating pressure of 2445 psig. At the moment of the incident the pressure was 1796 psig. Gas flow was 77240 mcf
Currency
Lessons Learned
Lessons Learned
CORRECTIVE MEASURES:The meter station was redesigned and reconstructed to minimize the risk of erosion. Permanent repairs scheduled were completed after one year.
Event Nature
Emergency Action
The alarm was given by a person of the public. The local refinery emergency response team responded and secured the area. The pipeline was isolated,and the fire was let burn ou and extinguished itself.The normal operation resterted 7 days later.6837 thousand standard cubic feet went lost during the leak (unintentional release)
Release Type
Release Substance
Hydrogen Release Concentration (%)
100.00
Release Amount (kg)
16190.00
Release Pressure (bar)
12.50
Detonation
No
Deflagration
No
High Pressure Explosion
No
High Voltage Explosion
No
Source Category
References
References

US Pipeline and Hazardous Materials Safety Administraytion PHMSA:
https://www.phmsa.dot.gov/safety-reports/pipeline-failure-investigation…

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