Port Neal fertilizer plant explosion

Port Neal fertilizer plant explosion

Aerial photograph of the Port Neal Complex following the explosion.
Time 6:06 a.m. CST (UTC−06:00)
Date December 13, 1994 (1994-12-13)
Location Terra Chemicals International,
Port Neal Complex,
Woodbury County, Iowa, United States
Coordinates 42°19′52″N 96°22′44″W / 42.331°N 96.379°W / 42.331; -96.379Coordinates: 42°19′52″N 96°22′44″W / 42.331°N 96.379°W / 42.331; -96.379
Cause Thermal decomposition of ammonium nitrate solution due to unsafe operating procedures.[1]
Deaths 4
Non-fatal injuries 18
Property damage $321 million[2]

The Port Neal fertilizer plant explosion occurred on December 13, 1994 in the ammonium nitrate plant at the Terra International, Inc., Port Neal Complex, 16 miles south of Sioux City, Iowa, United States.[1] Four workers at the plant were killed by the explosion, and eighteen others were injured.[3] The seven-story building at the seat of the blast was completely destroyed, leaving only a crater, and significant damage was inflicted to the surrounding structures.[4] Four nearby electricity generating stations were disabled by the explosion, and the effects of the blast were felt up to 30 miles away.[5] A high-voltage line running adjacent to the plant and over the Missouri River was damaged, disrupting power in the neighboring state of Nebraska.[6] Two 15,000-ton refrigerated ammonia storage tanks were ruptured, releasing liquid ammonia and ammonia vapors which forced the evacuation of 1,700 residents from the surrounding area.[7]

An investigation conducted by the United States Environmental Protection Agency (EPA) concluded in 1996 that the explosion was initiated by an accelerated thermal decomposition reaction as "a direct result of unsafe operating procedures and conditions" at the plant.[1] The EPA had conducted a safety audit at the plant just eight months prior to the explosion.[8] The plant was Iowa's largest producer of nitrogen-based fertilizers and its loss contributed to a national 50% increase in the cost of fertilizer by the following year.[4][9]

See also

References

  1. 1 2 3 Chemical Accident Investigation Report Terra Industries, Inc., Nitrogen Fertilizer Facility, Port Neal, Iowa (PDF). EPA. September 1996. Retrieved April 18, 2013.
  2. ↑ "Terra Resolves Insurance Claims Related to Port Neal Explosion". PR Newswire. December 23, 1997. Retrieved April 18, 2013.
  3. ↑ Gray, Bruce (December 14, 1994). "Four Die as Explosion Levels Iowa Plant". Chicago Sun-Times. Retrieved April 18, 2013. – via Highbeam Research (subscription required)
  4. 1 2 "Chemical plant blast kills four". Post-Tribune. December 14, 1994. Retrieved April 18, 2013. – via Highbeam Research (subscription required)
  5. ↑ "Blast at Iowa chemical plant kills four". The Buffalo News. December 13, 1994. Retrieved April 18, 2013. – via Highbeam Research (subscription required)
  6. ↑ "Les accidents impliquant des nitrates d'ammonium". ARIA. French Ministry of Environment. Retrieved April 18, 2013.
  7. ↑ "Iowa Fertilizer Plant Blast Kills 4; Release of Ammonia Gas Forces Evacuations; Explosion Felt 30 Miles Away". The Washington Post. December 14, 1994. Retrieved April 18, 2013. – via Highbeam Research (subscription required)
  8. ↑ Weiss, Rick (March 21, 1995). "Budget Cutters' Unfunded Mandate; Pinching Pennies at Chemical Safety Board May Prove Legally Costly". The Washington Post. Retrieved April 18, 2013. – via Highbeam Research (subscription required)
  9. ↑ "Oregon Farmers Face Higher Costs For Their Fertilizer". The Columbian. March 19, 1995. Retrieved April 18, 2013. – via Highbeam Research (subscription required)
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