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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.

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Unintentional Uncoupling of Compressed Gas Quick-Disconnect Fitting

The risk of a serious fire occurring inside the chemistry laboratory hood from use of hydrogen gas and/or presence of a small quantity of hydrazine-hydrate was underestimated. Additional control measures were required to reduce the risk of fire…

Near Miss Involving an Electrical Plug and Nitrogen Gas Supplied to a Gas Chromatograph

The incident resulted from an inadequate design for the storage location of the copper gas supply tubing (too close to an electrical outlet). The gas supply tubing was too long for its intended purpose and posed a hazard in its coiled state near…

Key:

= No Ignition
= Explosion
= Fire

Hydrogen Incident Summaries by Equipment and Primary Cause/Issue
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	9/1/1992 10/31/1980	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							5/3/2004 12/9/2010 2/8/2011
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

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Damage and Injuries

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Contributing Factors

Damage and Injuries

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