Disclaimer: The Lessons Learned Database includes the incidents that were voluntarily submitted. The database is not a comprehensive source for all incidents that have occurred.
The direct cause of the over-pressurization of the two drums was the repackaging of the phosphoric acid into metal UN1A1 drums and the resultant hydrogen gas generation within the sealed drums. At the time of this incident (1997), 49 CFR and…
Corrective actions included replacing the breakaway with a new one, which restored normal operation of the dispenser.
Verify and periodically inspect the pull/separation force adjustment if the breakaway is so equipped.
Additional…
A gas detector was added in close proximity to the compressor shaft and a vibration switch is under consideration. Additional predictive measures are being considered to predict bearing failure. In addition, the manufacturer has been contacted…
Included inspection on monthly preventive maintenance plan and evaluated alternate materials for better cold-weather performance.
The fitting was an SAE straight thread and was likely loosened by torque applied to the fueling hose. After the incident, these fittings had additional means applied to restrict loosening, a cover installed to deflect any leakage, and means taken…
1. Combustible gas detectors calibrated for hydrogen can falsely report hydrogen alarms due the presence of other gases the detector may pick up, such as carbon monoxide from engine exhaust or other sources. Since this event occurred, two…
Based on the results of the company investigation and analysis of an amateur video, the company determined that the incident could have been caused by the failure of one of the following plant components:
· pipes leading to the reactor…
The root cause of the fire that burned the evaporator pad and distorted the plastic evaporator pad bracket remains unknown. The initial investigation did not reveal any obvious signs of an ignition source in the vicinity of the forklift operation…
It appears that this was an isolated event caused by human error. The lessons learned are: (1) to caution workers to maintain their focus during fuel cell stack assembly, (2) to require verification that all tools and spare parts are accounted…
A hydrogen release of this type is a significant event. The event highlighted a number of procedural contributing factors that will influence the manner in which these fuel cell systems will be serviced in the future. A complicating factor in…
Implement rigorous assembly, verification, and documentation procedures for equipment.
Increase automated leak detection frequency.
Do not interconnect hydrogen drain trap lines with other drain lines
Thoroughly inspect equipment installation to manufacturer’s installation instructions
Warn against unauthorized field modifications
Consult the…
Maintain an internal process for verifying component wetted material compatibility for intended use as part of the procurement process for hydrogen system equipment.
Don’t rely solely on a manufacturer to provide appropriately rated…
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