Hydrogen safety

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Hydrogen safety covers the safe production, handling and use of hydrogen, particularly hydrogen gas fuel and liquid hydrogen.

Hydrogen possesses the NFPA 704's highest rating of 4 on the flammability scale because it is flammable when mixed even in small amounts with ordinary air; ignition can occur at a volumetric ratio of hydrogen to air as low as 4% due to the oxygen in the air and the simplicity and chemical properties of the reaction. However, hydrogen has no rating for innate hazard for reactivity or toxicity. The storage and use of hydrogen poses unique challenges due to its ease of leaking as a gaseous fuel, low-energy ignition, wide range of combustible fuel-air mixtures, buoyancy, and its ability to embrittle metals that must be accounted for to ensure safe operation.[1]

Liquid hydrogen poses additional challenges due to its increased density and the extremely low temperatures needed to keep it in liquid form. Moreover, its demand and use in industry—as rocket fuel, alternative energy storage source, coolant for electric generators in power stations, a feedstock in industrial and chemical processes including production of ammonia and methanol, etc.—has continued to increase, which has led to the increased importance of considerations of safety protocols in producing, storing, transferring, and using hydrogen.[1]

NFPA 704
fire diamond
The fire diamond hazard sign for both elemental hydrogen gas and its isotope deuterium.[2][3]

Prevention[edit]

There are a number of items to consider to help design systems and procedures to avoid accidents when dealing with hydrogen, as one of the primary dangers of hydrogen is that it is extremely flammable.[4]

Inerting and purging[edit]

Inerting chambers and/or purging gas lines is an important, standard safety procedure to take when transferring hydrogen. In order to properly inert and/or purge, the flammability limits must be taken into account, and hydrogen's are very different from other kinds of gases. At normal atmospheric pressure it is 4% to 75%, based on the volume percent of hydrogen in oxygen it's 4% to 94%, while the limits of detonability of hydrogen in air are 18.3% to 59% by volume.[1][5][6][7] In fact, these flammability limits can often be more stringent than this, as the turbulence during a fire can cause a deflagration which can create detonation. For comparison the deflagration limit of gasoline in air is 1.4–7.6%, and of acetylene in air,[8] 2.5%–82%.

Therefore, when equipment is open to air before or after a transfer of hydrogen, there are unique conditions to take into consideration that might have otherwise been safe with transferring other kinds of gases. Incidents have occurred because inerting or purging was not sufficient, or because the introduction of air in the equipment was underestimated (e.g., when adding powders), resulting in an explosion.[9] For this reason, inerting or purging procedures and equipment are often unique to hydrogen, and often the fittings or marking on a hydrogen line should be completely different to ensure that this and other processes are properly followed, as many explosions have happened simply because a hydrogen line was accidentally plugged into a main line or because the hydrogen line was confused with another.[10][11][12]

Ignition source management[edit]

The minimum ignition energy of hydrogen in air is one of the lowest among known substances at 0.02 mJ, and hydrogen-air mixtures can ignite with 1/10 the effort of igniting gasoline-air mixtures.[1][5] Because of this, any possible ignition source has to be scrutinized. Any electrical device, bond, or ground should meet applicable hazardous area classification requirement.[13][14] Any potential sources (like some ventilation system designs[15]) for static electricity build-up should likewise be minimized, e.g. through antistatic devices.[16]

Hot-work procedures must be robust, comprehensive, and well-enforced; and they should purge and ventilate high-areas and sample the atmosphere before work. Ceiling-mounted equipment should likewise meet hazardous area requirements (NFPA 497).[9] Finally, rupture discs should not be used as this has been a common ignition source for multiple explosions and fires. Instead other pressure relief systems such as a relief valve should be used.[17][18]

Mechanical integrity and reactive chemistry[edit]

There are four main chemical properties to keep in mind when dealing with hydrogen that can come into contact with other materials even in normal atmospheric pressures and temperatures:

  • The chemistry of hydrogen is very different from traditional chemicals. E.g., with oxidation in ambient environments. And neglecting this unique chemistry has caused issues at some chemical plants.[19] Another aspect to be considered as well is the fact that hydrogen can be generated as a byproduct of a different reaction may have been overlooked, e.g. Zirconium and steam creating a source of hydrogen.[20][21] This danger can be circumvented somewhat via the use of passive autocatalytic recombiners.
  • Another major issue to consider is the chemical compatibility of hydrogen with other common building materials like steel.[22][23] Because of hydrogen embrittlement, material compatibility with hydrogen must be specially considered.
  • These considerations can further change because of special reactions at high temperatures.
  • The diffusivity of hydrogen is very different from ordinary gases, and therefore gasketing materials have to be chosen carefully.[24][25]

All four of these factors must be considered during the initial design of a system using hydrogen, and is typically accomplished by limiting the contact between susceptible metals and hydrogen, either by spacing, electroplating, surface cleaning, material choice, and quality assurance during manufacturing, welding, and installation. Otherwise, hydrogen damage can be managed and detected by specialty monitoring equipment.[26][9]

Leaks and flame detection systems[edit]

Locations of hydrogen sources and piping have to be chosen with care. Since hydrogen is a lighter-than-air gas, it collects under roofs and overhangs, where it forms an explosion hazard. Many individuals are familiar with protecting plants from heavier-than-air vapors, but are unfamiliar with "looking up," and is therefore of particular note (for example, because of buoyancy, stresses are often pronounced near the top of a large storage tank [27]). It can also enter pipes and can follow them to their destinations. Because of this, hydrogen pipes should be well-labeled and located above other pipes to prevent this occurrence.[4][9]

Even with proper design, hydrogen leaks can support combustion at very low flow rates, as low as 4 micrograms/s.[1][28][6] To this end, detection is important. Hydrogen sensors allow for rapid detection of hydrogen leaks to ensure that the hydrogen can be vented and the source of the leak tracked down. Around certain pipes or locations special tapes can be added for hydrogen detection purposes. A traditional method is to add a hydrogen odorant with the gas as is common with natural gas. In fuel cell applications these odorants can contaminate the fuel cells, but researchers are investigating other methods that might be used for hydrogen detection: tracers, new odorant technology, advanced sensors, and others.[1]

While hydrogen flames can be hard to see with the naked eye (it can have a so-called "invisible flame"), they show up readily on UV/IR flame detectors. More recently Multi IR detectors have been developed, which have even faster detection on hydrogen-flames.[29][30] This is quite important in fighting hydrogen fires, as the preferred method of fighting a fire is stopping the source of the leak, as in certain cases (namely, cryogenic hydrogen) dousing the source directly with water may cause icing, which in turn may cause a secondary rupture.[31][27]

Ventilation and flaring[edit]

Aside from flammability concerns, in enclosed spaces, hydrogen can also act as an asphyxiant gas.[1] Therefore, one should make sure to have proper ventilation to deal with both issues should they arise, as it is generally safe to simply vent hydrogen into the atmosphere. However, when placing and designing such ventilation systems, one must keep in mind that hydrogen will tend to accumulate towards the ceilings and peaks of structures, rather than the floor. Many dangers may be mitigated by the fact that hydrogen rapidly rises and often disperses before ignition.[32][9]

In certain emergency or maintenance situations, hydrogen can also be flared.[33] For example, a safety feature in some hydrogen-powered vehicles is that they can flare the fuel if the tank is on fire, burning out completely with little damage to the vehicle, in contrast to the expected result in a gasoline-fueled vehicle.[34]

Inventory management and facility spacing[edit]

Ideally, no fire or explosion will occur, but the facility should be designed so that if accidental ignition occurs, it will minimize additional damage. Minimum separation distances between hydrogen storage units should be considered, together with the pressure of said storage units (c.f., NFPA 2 and 55). Explosion venting should be laid out so that other parts of the facility will not be harmed. In certain situations, a roof that can be safely blown away from the rest of the structure in an explosion.[9]

Cryogenics[edit]

Liquid hydrogen has a slightly different chemistry compared to other cryogenic chemicals, as trace accumulated air can easily contaminate liquid hydrogen and form an unstable mixture with detonative capabilities similar to TNT and other highly explosive materials. Because of this, liquid hydrogen requires complex storage technology such as the special thermally insulated containers and requires special handling common to all cryogenic substances. This is similar to, but more severe than liquid oxygen. Even with thermally insulated containers it is difficult to keep such a low temperature, and the hydrogen will gradually leak away. (Typically it will evaporate at a rate of 1% per day).[1][35]

The main danger with cryogenic hydrogen is what is known as BLEVE (Boiling Liquid Expanding Vapor Explosion). Because hydrogen is gaseous in atmospheric conditions, the rapid phase change together with the detonation energy combine to create a more hazardous situation.[36]

Human factors[edit]

Along with traditional job safety training, checklists to help prevent commonly skipped steps (e.g., testing high points in the work area) should be implemented, along with instructions on the situational dangers that come inherent to working with hydrogen.[9][37]

Incidents[edit]

Date Location Damages Suspected Cause
1937-05-06 Naval Air Station Lakehurst As the zeppelin Hindenburg was approaching landing, a fire detonated one of the aft hydrogen cells, thereby rupturing neighbouring cells and causing the airship to fall to the ground aft-first. The inferno then travelled towards the stern, bursting and igniting the remaining cells. Despite 4 news stations recording the disaster on film and surviving eyewitness testimonies from crew and people on the ground, the cause of the initial fire was never conclusively determined.[citation needed]
1986-01-28 Kennedy Space Center A large LH2 tank ruptured and exploded, killing all 7 astronauts aboard the Space Shuttle Challenger A faulty O-ring on the solid rocket booster allowed hot gases and flames to impinge upon the external LH2 tank, causing the tank wall to weaken and then burst. The thrust generated from the contents of the tank caused the LOX tank above to also rupture, and this mixture of LH2/LOX then detonated, destroying the orbiter in the explosion.
1999 Hanau, Germany A large chemical tank used to store hydrogen for manufacturing processes exploded. The tank was designed to lay on its side, but instead was laid upright. The forces towards the top of the tank caused it to rupture and then explode.[27]
2007-01 Muskingum River Coal Plant (owned and operated by AEP) An explosion of compressed hydrogen during delivery at the Muskingum River Coal Plant. Caused significant damage and killed one person.[38][39][40] A premature rupture of a pressure relief disc used for the compressed hydrogen cooling system.[41]
2011 Fukushima, Japan Three reactor buildings were damaged by hydrogen explosions. Exposed Zircaloy cladded fuel rods became very hot and reacted with steam, releasing hydrogen.[42][43] The containments were filled with inert nitrogen, which prevented hydrogen from burning in the containment. However, the hydrogen leaked from the containment into the reactor building, where it mixed with air and exploded.[44] To prevent further explosions, vent holes were opened in the top of the remaining reactor buildings.
2015 The Formosa Plastics Group refinery in Taiwan Chemical plant explosion. Due to hydrogen leaking from a pipe.[45]
2018-02-12 1:20 p.m. Diamond Bar, a suburb of Los Angeles, CA On the way to an FCV hydrogen station, a truck carrying about 24 compressed hydrogen tanks caught fire. This caused the evacuation initially of a one-mile radius area of Diamond Bar. The fire broke out on the truck at about 1:20 p.m. at the intersection of South Brea Canyon Road and Golden Springs Drive, according to a Los Angeles County Fire Department dispatcher.[46][47][48][49] The National Transportation Safety Board has launched an investigation.[50]
2018-08 Veridam El Cajon, CA A delivery truck carrying liquid hydrogen caught fire at Veridiam manufacturing plant.[51] in El Cajon CA.[52] It is not known what caused the explosion.[53]
2019-05 AB Specialty Silicones in Waukegan, Illinois An explosion killed four workers and seriously injured a fifth. Operator error adding an incorrect ingredient.[54][19]
2019-05-23 Gangwon Technopark in Gangneung, South Korea A hydrogen tank exploded killing 2 and injuring 6.[55][56] Oxygen seeped into the hydrogen storage tanks.[57]
2019-06 Air Products and Chemicals facility in Santa Clara, CA Tanker truck explosion damaging surrounding hydrogen transfill facility. Leak in transfer hose.[58] This resulted in the temporary shutdown of multiple hydrogen fueling stations in the San Francisco area.[59]
2019-06 Norway A Uno-X fueling station experienced an explosion,[60] resulting in the shutdown of all Uno-X hydrogen fueling stations and a temporary halt in sales of fuel cell vehicles in the country.[61] Investigations determined that neither the electrolyzer nor the dispenser used by customers had anything to do with this incident.[62][63] Instead, Nel ASA announced the root cause of the incident had been identified as an assembly error of the use of a specific plug in a hydrogen tank in the high-pressure storage unit.[64]
2019-12 An Airgas facility in Waukesha, Wisconsin A gas explosion injured one worker and caused 2 hydrogen storage tanks to leak.[65][66] Unknown.[67]
2020-04-07 OneH2 Hydrogen Fuel plant in Long View, North Carolina An explosion caused significant damage to surrounding buildings. The blast was felt several miles away, damaging about 60 homes. No injuries from the explosion were reported. The incident remains under investigation.[68][69][70][71] The company published a press release: Hydrogen Safety Systems Operated Effectively, Prevented Injury at Plant Explosion.[72]
2020-06-11 Praxair Inc., 703 6th St. Texas City, Texas An explosion occurred at the hydrogen production plant. No further details.[73][74]
2020-09-30 Changhua City, Taiwan A hydrogen tanker crashed and exploded, killing the driver. Vehicle crash.[75]
2021-08-09 Medupi Power Station in South Africa An explosion in Unit 4 of the plant. Improper operator procedure while the generator was being purged of hydrogen.[76]
2022-02-25 In Detroit MI a hydrogen tank for a balloon in a Pick Up Truck bed exploded. The Detroit Fire Department believes a leak in the hydrogen tank caused the explosion.

[77]

Hydrogen codes and standards[edit]

Hydrogen codes and standards are codes and standards (RCS) for hydrogen fuel cell vehicles, stationary fuel cell applications and portable fuel cell applications.

Additional to the codes and standards for hydrogen technology products, there are codes and standards for hydrogen safety, for the safe handling of hydrogen[78] and the storage of hydrogen. What follows is a list of some of the major codes and standards regulating hydrogen:

Name of standard Short title
NFPA 2 Hydrogen technologies code
NFPA 30A Rules for design of refueling stations
NFPA 50A Standard for gaseous hydrogen systems at consumer sites
NFPA 50B Standard for liquefied hydrogen systems at consumer sites
NFPA 52 Compressed Natural Gas Vehicular Fuel Systems Code
NFPA 57 Liquefied natural gas vehicular fuel systems standard
29CFR1910.103 Gaseous and cryogenic hydrogen handling and storage
29CFR1910.119 Process safety management of highly hazardous chemicals
40CFR68 Chemical acccident prevention provisions
49CFR Regulations on shipping and handling hydrogen gas and cryogenic hydrogen

[79][80]

Guidelines[edit]

The current ANSI/AIAA standard for hydrogen safety guidelines is AIAA G-095-2004, Guide to Safety of Hydrogen and Hydrogen Systems.[81] As NASA has been one of the world's largest users of hydrogen, this evolved from NASA's earlier guidelines, NSS 1740.16 (8719.16).[82] These documents cover both the risks posed by hydrogen in its different forms and how to ameliorate them. NASA also references Safety Standard for Hydrogen and Hydrogen Systems [83] and the Sourcebook for Hydrogen Applications.[84][79]

Another organization responsible for hydrogen safety guidelines is the Compressed Gas Association (CGA), which has a number of references of their own covering general hydrogen storage,[85] piping,[86] and venting.[87][79]

See also[edit]

References[edit]

  1. ^ a b c d e f g h Office of Energy Efficiency and Renewable Energy. "hydrogen safety" (PDF).
  2. ^ "HYDROGEN | CAMEO Chemicals | NOAA". cameochemicals.noaa.gov. Retrieved Nov 29, 2020.
  3. ^ "DEUTERIUM | CAMEO Chemicals | NOAA". cameochemicals.noaa.gov. Retrieved Nov 29, 2020.
  4. ^ a b Utgikar, Vivek P; Thiesen, Todd (2005). "Safety of compressed hydrogen fuel tanks: Leakage from stationary vehicles". technology in Society. 27 (3): 315–320. doi:10.1016/j.techsoc.2005.04.005.
  5. ^ a b Lewis, Bernard; Guenther, von Elbe (1961). Combustion, Flames and Explosions of Gases (2nd ed.). New York: Academic Press, Inc. p. 535. ISBN 978-0124467507.
  6. ^ a b Kalyanaraman, M (4 September 2019). "'Only a question of time' until large hydrogen systems are stable". Riviera Maritime Media.
  7. ^ Barbalace, Kenneth. "Periodic Table of Elements - Hydrogen - H".
  8. ^ MSHA – Safety Hazard Information – Special Hazards of Acetylene Archived 2016-01-22 at the Wayback Machine. Msha.gov. Retrieved on 2012-07-13.
  9. ^ a b c d e f g P. E., Sarah Eck, and Michael D. Snyder (December 2021). "Hydrogen Safety Fundamentals". Chemical Engineering Progress. pp. 36–41.{{cite news}}: CS1 maint: multiple names: authors list (link)
  10. ^ H2Tools (September 2017). "USE OF "QUICK-DISCONNECT" FITTINGS RESULTS IN LABORATORY INSTRUMENT EXPLOSION". Pacific Northwest National Laboratory.
  11. ^ H2Tools (September 2017). "HYDROGEN TUBE TRAILER EXPLOSION". Pacific Northwest National Laboratory.
  12. ^ H2Tools (September 2017). "HYDROGEN LAB FIRE". Pacific Northwest National Laboratory.
  13. ^ H2Tools (September 2017). "FIRE AT HYDROGEN FUELING STATION". Pacific Northwest National Laboratory. The initial source of fire was likely a release of hydrogen from a failed weld on a pressure switch.
  14. ^ H2Tools (September 2017). "SMALL FIRE IN FUEL CELL TEST STAND". Pacific Northwest National Laboratory. An electrical short circuit occurred, causing a small electrical fire.
  15. ^ H2Tools (September 2017). "INCORRECT RELIEF VALVE SET POINT LEADS TO EXPLOSION". Pacific Northwest National Laboratory. Contributing cause was poor design of the venting system, which was installed in a horizontal position, causing inadequate venting and buildup of static electricity.
  16. ^ H2Tools (September 2017). "FUEL CELL EVAPORATOR PAD FIRE". Pacific Northwest National Laboratory. One theory presented the possibility of a spark (caused by static electricity) being the source of the ignition that caused the fire. Due to the proximity of the fuel cell unit to a shrink-wrap packaging machine at the time of the incident, this seemed to be a plausible hypothesis.
  17. ^ H2Tools (September 2017). "HYDROGEN EXPLOSION DUE TO INADEQUATE MAINTENANCE". Pacific Northwest National Laboratory. As a corrective action, eliminate burst discs from hydrogen storage assembly. Redesign venting system for the pressure relief valves to prevent or inhibit moisture build up and allow moisture drainage.
  18. ^ H2Tools (September 2017). "HYDROGEN EXPLOSION AT COAL-FIRED POWER PLANT". Pacific Northwest National Laboratory. Explore elimination of rupture disk PRDs and substitution of spring-style relief valves.
  19. ^ a b Abderholden, Frank S. "Waukegan plant explosion that killed four workers was preventable, federal officials say". chicagotribune.com. Retrieved 2020-01-06. Engineering Systems, Inc. conducted an independent investigation into the root cause of the explosion, which determined the cause to be human error that resulted in the mistaken addition of an erroneous ingredient.
  20. ^ Japanese engineers work to contain nuclear reactor damage, Los Angeles Times, March 14, 2011
  21. ^ Chernobyl Accident Appendix 1: Sequence of Events, World Nuclear Association, November 2009
  22. ^ H2Tools (September 2017). "AUTOMATED HYDROGEN BALL VALVE FAILS TO OPEN DUE TO VALVE STEM FAILURE". Pacific Northwest National Laboratory. valve stem material incompatibility with hydrogen (causing a material weakening) is suspected
  23. ^ H2Tools (September 2017). "GASEOUS HYDROGEN LEAK AND EXPLOSION". Pacific Northwest National Laboratory. A GH2 leak occurred in an underground ASTM A106 Grade B, Schedule XX carbon steel pipe with a 3.5-inch diameter and a 0.6-inch wall thickness. The pipe was coated with coal tar primer and coal tar enamel, wrapped with asbestos felt impregnated with coal tar, coated with a second coat of coal tar enamel, and wrapped in Kraft paper, in accordance with American Water Works Association Standard G203. The source of the leak was an oval hole about 0.15 in x 0.20 in at the inner surface of the pipe and about 2-in in diameter at the outer surface of the pipe. Upon excavation of the pipe, it was noted that the coating was not present at the leak point. This resulted in galvanic corrosion over a 15-year period and the eventual rupture when high-pressure gas was applied to the thin pipe membrane. The pipe was 8 ft 9 in below the concrete pad.
  24. ^ "FM Global Hydrogen Datasheets (online): Hydrogen, Data Sheet ID# 7-91". Factory Mutual. April 2021.
  25. ^ H2Tools (September 2017). "LEAK ON COMPRESSOR AT FUELING STATION". Pacific Northwest National Laboratory. This allowed greater movement of the shaft, which led to a shaft seal leaking hydrogen.
  26. ^ The Australian Institute for Non Destructive Testing (AINDT), Detection and Quantification of Hydrogen Damage
  27. ^ a b c Schmidtchen, Ulrich (2002-10-02). "EIHP2 META Proceedings DVW" (PDF). EIHP. Brussels: German Hydrogen Association.
  28. ^ M.S. Butler, C.W. Moran, Peter B. Sunderland, R.L. Axelbaum, Limits for Hydrogen Leaks that Can Support Stable Flames, International Journal of Hydrogen Energy 34 (2009) 5174–5182.
  29. ^ Fire & Gas Technologies, Inc. "IR3 Flame Detector - FlameSpec-IR3-H2".
  30. ^ spectrex. "40/40M Multi IR Flame Detector".
  31. ^ Piplines and Hazardous Materials Safety Administration - Department of Transportation (2008). "Emergency Response Handbook" (PDF). p. 115. Archived from the original (PDF) on 3 June 2009. Do not direct water at source of leak or safety devices; icing may occur.
  32. ^ Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants. National Academies of Sciences, Engineering, and Medicine. Vol. 2. Washington, DC: The National Academies Press. 2008.
  33. ^ "Explosive Lessons in Hydrogen Safety | APPEL Knowledge Services". appel.nasa.gov.
  34. ^ "Hydrogen Car Safety Test- Fuel Leak H2 vs. Petrol". Vimeo. Retrieved 2020-05-07.
  35. ^ Peter Kushnir. Hydrogen As an Alternative Fuel Archived 2008-08-08 at the Wayback Machine. PB 700-00-3. Vol. 32, Issue 3, May–June 2000. almc.army.mil.
  36. ^ H2Tools (September 2017). "LIQUID HYDROGEN TANK BOILING LIQUID EXPANDING VAPOR EXPLOSION (BLEVE) DUE TO WATER-PLUGGED VENT STACK". Pacific Northwest National Laboratory. Place signs on all liquid hydrogen tanks indicating that no water is to be put on the vent stack.
  37. ^ H2Tools (September 2017). "LIQUID HYDROGEN DELIVERY TRUCK OFFLOADING VALVE FAILURE". Pacific Northwest National Laboratory.
  38. ^ Williams, Mark (January 8, 2007). "Ohio Power Plant Blast Kills 1, Hurts 9". Associated Press. Retrieved 2008-05-09.
  39. ^ "Muskingum River Plant Hydrogen Explosion January 8, 2007" (PDF). American Electric Power. November 11, 2006. Archived from the original (PDF) on 2008-04-09. Retrieved 2008-05-09.
  40. ^ "Hydrogen Incident Reporting and Lessons Learned". h2incidents.org.
  41. ^ H2Tools (September 2017). "HYDROGEN EXPLOSION AT COAL-FIRED POWER PLANT". Pacific Northwest National Laboratory.
  42. ^ Nuclear Fuel Behaviour in Loss-of-coolant Accident (LOCA) Conditions (PDF). Nuclear Energy Agency, OECD. 2009. p. 140. ISBN 978-92-64-99091-3.
  43. ^ Hydrogen explosions Fukushima nuclear plant: what happened? Archived 2013-12-02 at the Wayback Machine. Hyer.eu. Retrieved on 2012-07-13.
  44. ^ "The Fukushima Daiichi Accident. Report by the Director General" (PDF). International Atomic Energy Agency. 2015. p. 54. Retrieved 2 March 2018.
  45. ^ Charlier, Phillip (2019-04-07). "Chemical plant explosion rocks southern Taiwan, heard more than 30 kilometers away". Taiwan English News. Retrieved 2020-11-26.
  46. ^ "Truck Carrying Hydrogen Tanks Catches Fire, Forces Evacs". NBC Southern California. Retrieved 2019-06-18.
  47. ^ "Diamond Bar Evacs Lifted After Hydrogen Fire". NBC Southern California. Retrieved 2019-06-18.
  48. ^ 323/310 Hood News (2018-02-12), DIAMOND BAR TRUCK EXPLOSION, archived from the original on 2021-12-21, retrieved 2019-06-18
  49. ^ CBS Los Angeles (2018-02-11), Tractor Trailer Fire Evacuations In Diamond Bar, archived from the original on 2021-12-21, retrieved 2019-06-18
  50. ^ "Hydrogen truck explodes on way to FCV refueling site [Video]". LeftLaneNews. Retrieved 2019-06-18.
  51. ^ "Veridiam, Inc". Strategic Manufacturing Partner > Veridiam. Retrieved Nov 29, 2020.
  52. ^ "Truck carrying liquid hydrogen catches fire". KGTV. 2018-08-29. Retrieved 2019-06-26.
  53. ^ "Tanker Filled With Liquid Hydrogen Catches Fire at El Cajon Business Park".
  54. ^ "Hydrogen blast led to deaths at US silicones plant". Chemical & Engineering News. Retrieved 2020-01-06.
  55. ^ Herald, The Korea (2019-05-23). "Hydrogen tank explosion kills 2 in Gangneung". www.koreaherald.com. Retrieved 2019-06-14.
  56. ^ "Tank explosion poses setback for Seoul's push for hydrogen economy – Pulse by Maeil Business News Korea". pulsenews.co.kr (in Korean). Retrieved 2019-06-14.
  57. ^ Kim, S.I. and Y. Kim (2019). "Review: Hydrogen Tank Explosion in Gangneung, South Korea". Center for Hydrogen Safety Conference.
  58. ^ "Hydrogen explosion shakes Santa Clara neighborhood". ABC7 San Francisco. 2019-06-02. Retrieved 2019-06-12.
  59. ^ Woodrow, Melanie. "Bay Area experiences hydrogen shortage after explosion", ABC news, June 3, 2019
  60. ^ Huang, Echo. "A hydrogen fueling station explosion in Norway has left fuel-cell cars nowhere to charge". Quartz. Retrieved 2019-06-12.
  61. ^ Dobson, Geoff (12 June 2019). "Exploding hydrogen station leads to FCV halt". EV Talk.
  62. ^ Sampson2019-06-13T12:02:00+01:00, Joanna. "Preliminary findings from H2 station investigation". gasworld. Retrieved 2019-06-14.
  63. ^ "Moon's 'hydrogen diplomacy' tarnished by charging station explosion". koreatimes. 2019-06-13. Retrieved 2019-06-14.
  64. ^ "Nel ASA: Status update #5 regarding incident at Kjørbo". News Powered by Cision. Retrieved 2019-07-01.
  65. ^ "VIDEO: 1 injured after explosion at Waukesha gas company". ABC7 Chicago. 2019-12-13. Retrieved 2019-12-15.
  66. ^ "Gas explosion injures 1 worker in Waukesha". Star Tribune. Retrieved 2019-12-15.
  67. ^ Riccioli, Jim. "'A massive boom': Explosion at Waukesha gas company reverberated through the city and left one injured". Milwaukee Journal Sentinel. Retrieved 2019-12-15.
  68. ^ "Explosion at hydrogen fuel plant in US damages around 60 buildings". www.hazardexonthenet.net. Retrieved 2020-05-07.
  69. ^ Burgess2020-04-08T11:51:00+01:00, Molly. "60 homes damaged after hydrogen plant explosion". gasworld. Retrieved 2020-05-07.
  70. ^ Burgess2020-04-14T08:20:00+01:00, Molly. "OneH2: Hydrogen plant explosion update". gasworld. Retrieved 2020-05-07.
  71. ^ Koebler, Jason (2020-04-07). "One of the Country's Only Hydrogen Fuel Cell Plants Suffers Huge Explosion". Vice. Retrieved 2020-05-07.
  72. ^ "HYDROGEN SAFETY SYSTEMS OPERATED EFFECTIVELY, PREVENTED INJURY AT PLANT EXPLOSION" (PDF). oneh2.com. April 10, 2020. Retrieved 29 November 2020.
  73. ^ "Praxair Texas City Hydrogen Plant Explosion". "Zehl & Associates". 2020-06-12. Retrieved 2020-06-20.
  74. ^ Lacombe, James (2020-06-11). "Small industrial explosion rattles Texas City". Galveston County-The Daily News. Retrieved 2020-06-20.
  75. ^ Charlier, Phillip (2020-09-30). "Hydrogen tanker crashes and explodes on freeway in Changhua City". Taiwan English News. Retrieved 2020-11-26.
  76. ^ Parkinson, Giles (2021-08-11). "World's newest and most expensive coal plant explodes after hydrogen leak". RenewEconomy. Retrieved 2021-10-11.
  77. ^ Wimbley, Randy (2022-02-25). "2 injured in hydrogen tank explosion at Henry Ford Hospital parking deck". Fox2Detroit.com. Retrieved 2022-02-25.
  78. ^ HySafe Initial Guidance for Using Hydrogen in Confined Spaces. (PDF) . Retrieved on 2012-07-13.
  79. ^ a b c Cadwallader, L C, and Herring, J S (1999). "Safety Issues with Hydrogen as a Vehicle Fuel". United States. doi:10.2172/761801.{{cite news}}: CS1 maint: multiple names: authors list (link)
  80. ^ "List of NFPA Codes & Standards". NFPA.
  81. ^ "AIAA G-095-2004, Guide to Safety of Hydrogen and Hydrogen Systems" (PDF). AIAA. Retrieved 2008-07-28.
  82. ^ Gregory, Frederick D. (February 12, 1997). "Safety Standard for Hydrogen and Hydrogen Systems" (PDF). NASA. Archived from the original (PDF) on February 27, 2006. Retrieved 2008-05-09.
  83. ^ Safety Standard for Hydrogen and Hydrogen Systems: Guidelines for Hydrogen System Design, Materials Selection, Operations, Storage, and Transportation. Vol. NASA TM-112540, NSS 1740.16. Washington, DC: Office of Safety and Mission Assurance, National Aeronautics and Space Administration. 1997-10-29.
  84. ^ Sourcebook for Hydrogen Applications. Quebec, CA: Hydrogen Research Institute and the National Renewable Energy Laboratory. 1998.
  85. ^ Hydrogen (4 ed.). Arlington, VA: Compressed Gas Association, Inc. 1991.
  86. ^ Standard for Hydrogen Piping Systems (1 ed.). Arlington, VA: Compressed Gas Association, Inc. 1992.
  87. ^ Hydrogen Vent Systems (1 ed.). Arlington, VA: Compressed Gas Association, Inc. 1996.

External links[edit]