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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 lessons of this event fall into five categories: (1) proper in-plant communications during events, (2) proper valve application for use with hydrogen, (3) excess flow check valve set point, (4) heating and ventilation and air conditioning (…
In the future, refining, petrochemical, and chemical industries need to review material verification programs to ensure that the maintenance procedures include sufficient controls and positive material identification (PMI) testing to prevent…
These events show the importance of preventing combustible gas mixtures from accumulating in piping. In both of the above described events, hydrogen and oxygen gases apparently accumulated to a combustible level which then catastrophically failed…
Recommendation 1 - Overhaul and replace the diaphragms on all cells showing low-purity results. Check on a routine basis the individual cell purity levels to monitor the deterioration of performance of individual cells. Certain…
Work documentation (work orders and baseline drawings) should reflect the current system configuration.
Recommendations
Batteries stored on a charger can explode during use if overcharged.
Recommendations
Personnel should be properly supervised, and supervisors should be aware of the activities of their personnel. Personnel must be motivated to adhere to established policies and procedures. All personnel associated with potentially hazardous work…
Immediate Corrective Actions
In addition to resealing the glove box window, a positive pressure of argon gas was maintained inside the glove box while the course of action was planned. Subsequently, the glove box was cleaned up by specialized hazardous materials personnel…
Because the bottle was located outside at the time of the event, and the hydrogen did not find a source of ignition while venting through the relief valve, nothing serious happened. The failed regulator was replaced and operations continued.…
As stated on the MSDS and also on the container labels, LiAlH4 should be handled under argon. LiAlH4 is advertised and sold as a powder. If the researcher had to scrape it out of the jar, then it was no longer a powder, which seems indicative of…
During charging, most batteries will offgas hydrogen, making adequate ventilation and the elimination of ignition sources critical attributes of the charging area. Data from the battery manufacturer should be consulted to determine appropriate…
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…
1. The trailer involved in the incident used a frangible burst disk based upon the proprietary metal compound designated as Inconel #600. Random sampling of similar pressure relief devices from the same trailer showed that all of them failed at…
LESSONS LEARNED:
Compressed gas cylinder caps can be very difficult to open as rust often occurs in the threads.
There are wrenches specifically designed to remove compressed gas cylinder caps. The lab had such a wrench and it was…
1. Increase physical protection, shielding, and securing of transported hydrogen tube valves, piping, and fittings from multi-directional forces that are likely to occur during accidents, including rollovers. Reference: 49 Code of Federal…
Upgrade the liquid hydrogen pump control system to shut down operation of the pump and protect the system when malfunctions like leaks, pump cavitation, or loss of purge gas occur.
Verify that maintenance procedures used for liquid…
It is important to understand the requirements and standards associated with safe equipment design (especially electrical equipment containing an internal ignition source with flammable gas) in potentially explosive atmosphere environments.…
1. Management must ensure that operating decisions are not based primarily on cost and production. Performance goals and operating risks must be effectively communicated to all employees. Facility management must set safe, achievable operating…
Key:
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