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.
Include the tanks in a regular inspection program. Evaluate their condition and replace if necessary.
Fill the tanks only half full with leach material.
Keep the material completely submerged in solution.
Install a fiberglass…
Specific response drills/exercises need to be conducted yearly. In this case, all safety systems worked as they should and outside emergency responders were not needed.
Performing other tasks while filling hydrogen tube trailers, such as…
Replace the existing copper and carbon steel hydrogen pipeline with ¾-inch schedule 40 stainless steel.
Reroute the new hydrogen line in the preferred location.
Locate new hydrogen shut-off valves in a more convenient location.…
The uncontrolled release of hydrogen occurred as a result of the rupture of the No. 6 hydrogen storage tube’s burst disc. This disc failed in response to being overloaded by mechanical stresses developed as water expanded and formed ice while in…
This incident led to several changes in procedure:
The site needs to implement a good Operational and Readiness Inspection procedure. System inspection deficiencies need to be identified, and (if possible) reviewed by a second party before future tests are conducted. This inspection could include…
Normally hydrogen fires are not extinguished until the supply of hydrogen has been shut off due to the danger of re-ignition and explosion. During a gas leak/fire, it is important to shut off the source of the hydrogen if it is safe to do so. If…
Lessons Learned
Construction errors are difficult to detect once construction is complete. It is important to develop and use a systematic oversight process for minimizing construction errors during the construction process.
…
The uncontrolled release of hydrogen occurred as a result of the rupture of the No. 6 hydrogen storage tube’s burst disc. This disc failed in response to being overloaded by mechanical stresses developed as water expanded and formed ice while in…
Routine maintenance activities on pressurized hydrogen systems should be conducted per written design specifications. The procedures should provide detailed oversight regarding bolt, nut and fitting replacements or repairs. A formal review…
Personnel should be aware that items requiring special receiving inspections should still be verified/examined by the end user prior to use.
Given that the anaerobic chamber and associated nearby electrical equipment were not designed or…
Proper installation of check valves and other equipment should be visually inspected prior to pressurization.
Maintenance on the low-pressure venting system was not occurring at regular intervals. Ventilation integrity is now checked before starting an experiment.
Mounting hardware incorporated polymeric braces not suitable for long-term exposure to sunlight and temperature extremes. With time, the polymeric materials had disintegrated, allowing the mounting brackets to become loose. In addition, the…
Key:
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