CHECK OUT OUR MOST RELEVANT INCIDENT LISTINGS!
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.
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 information on…
Mechanical pressure gauges tend to be imprecise if only used in a narrow portion of the full scale. Digital transducers, although slightly more expensive, offer much more precision. The event happened because the set pressure was only 10% of full…
1. Ensure that equipment and materials exposed to hydrogen are compatible with a hydrogen environment (even hydrogen-service-rated equipment).
2. Equipment designs in a hydrogen environment that use the fracture toughness for 17-4…
The packing in the flow control valve should be replaced periodically. A planned investigation will determine the optimum time period for packing replacement.
Manuals showing the correct connecting and disconnecting procedures were established for each fueling dispenser. Separate manuals were needed since the shape of the grip differs from dispenser to dispenser.
Defects in equipment, such as welds, may not be evident during initial proof testing and operation.
When an equipment defect is found, check equipment for possible similar defects in other areas of the equipment.
The following recommended actions were identified:
Reemphasize the current lab management policies and practices on how process changes are evaluated for direct/indirect impacts on the process.
Reinforce with lab workers the…
Maintenance work scopes must be adhered to. If added work is approved, it must be tracked and reviewed to ensure that the equipment is inspected by operations personnel. Scheduled work and extra work should be listed and checked off for proper…
Safe work procedures will be prepared and followed. Hydrogen will be vented out of the system to create an inert atmosphere before working on system tubing and joints. The importance of purging hydrogen piping and equipment is discussed in the…
1. All samples with potential for hydrogen buildup should be limited to ground shipment only. (This shipment was by ground and air. If this incident were to have happened in an airplane, the consequences may have been worse.)
2. All…
A step was added to the laboratory procedure in which all catalyst waste is thoroughly dampened with water and sealed in a plastic bag before being placed into a waste container.
Disable the fueling process if the operator does not follow the proper sequence of steps in the fueling procedure. Improve the fueling procedure to make it inherently impossible for the sequence to be done improperly with the same result.
Excessive venting of hydrogen from the tank due to lower facility consumption, in combination with extreme temperature conditions, placed thermal stress on the gland nut, causing a leak. The low consumption of hydrogen resulted from the shutdown…
Maintenance on the low-pressure venting system was not occurring at regular intervals. Ventilation integrity is now checked before starting an experiment.
The combination of the cold water temperature (reducing the fatigue strength of the bolt), and the abnormally high number of cyclical stresses imposed by the imbalance from the hydraulic system check valve failure resulted in the failure of the…
For the use of mechanical fittings in hydrogen service, administrative controls should be in place, as in this case, to ensure that leak testing is conducted on a regular basis. It should never be assumed that every fitting is tight. Additional…
Investigation determined that internal galling has caused the failure rendering the needle valve unusable. The galling was caused by a stainless steel stem acting against a stainless steel seat. This failure mode had been observed before and the…
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.
…
One needs to take extreme care with both new and supposedly spent hydride samples; the spent materials may contain pockets of unoxidized alanates that could react violently when being transferred.
Work with small samples so if something…
Now, when conducting a sulfur deprivation test, vessels are ventilated to prevent over pressurization and safely facilitate the release of excess hydrogen.
Key:
- = No Ignition
- = Explosion
- = Fire
Equipment / Cause | Equipment Design or Selection | Component Failure | Operational Error | Installation or Maintenance | Inadequate Gas or Flame Detection | Emergency Shutdown Response | Other or Unknown |
---|---|---|---|---|---|---|---|
Hydrogen Gas Metal Cylinder or Regulator | 3/31/2012 4/30/1995 2/6/2013 |
4/26/2010 | 12/31/1969 | 3/17/1999 11/1/2001 12/23/2003 |
|||
Piping/Valves | 4/4/2002 2/2/2008 5/11/1999 |
4/20/1987 11/4/1997 12/31/1969 8/19/1986 7/27/1991 12/19/2004 2/6/2008 10/3/2008 4/5/2006 5/1/2007 9/19/2007 10/31/1980 |
2/7/2009 | 1/24/1999 2/24/2006 6/8/1998 12/31/1969 2/7/2009 |
10/3/2008 | ||
Tubing/Fittings/Hose | 9/23/1999 8/2/2004 8/6/2008 9/19/2007 |
1/1/1982 | 9/30/2004 10/7/2005 |
10/7/2005 | |||
Compressor | 10/5/2009 6/10/2007 8/21/2008 1/15/2019 |
10/5/2009 | 8/21/2008 | ||||
Liquid Hydrogen Tank or Delivery Truck | 4/27/1989 | 12/19/2004 1/19/2009 |
8/6/2004 | 12/31/1969 | 1/1/1974 | 12/17/2004 | |
Pressure Relief Device | 7/25/2013 5/4/2012 |
1/15/2002 1/08/2007 |
12/31/1969 | ||||
Instrument | 1/15/2019 | 3/17/1999 12/31/1969 2/6/2013 |
11/13/73 | ||||
Hydrogen Generation Equipment | 7/27/1999 | 10/23/2001 | |||||
Vehicle or Lift Truck | 7/21/2011 | 2/8/2011 12/9/2010 |
|||||
Fuel Dispenser | 8/2/2004 5/1/2007 6/11/2007 9/19/2007 |
2/24/2006 1/22/2009 |
|||||
Fuel Cell Stack | |||||||
Hydrogen Cooled Generator | 12/31/1969 2/7/2009 |
||||||
Other (floor drain, lab anaerobic chamber, heated glassware, test chamber, gaseous hydrogen composite cylinder, delivery truck) |
11/14/1994 7/21/2011 |
7/27/1999 6/28/2010 8/21/2008 |
12/31/1969 3/22/2018 |
6/10/2019 |
- = No Ignition
- = Explosion
- = Fire