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Information about hazmat

Published on November 7, 2007

Author: Elodie

Source: authorstream.com

Graniteville, SC:  Graniteville, SC Hazardous Materials Chlorine Release::  Chlorine Release: Tank car punctured About 60 tons of poisonous liquefied chlorine gas released Ninth of 42 freight cars Chlorine Gas::  Chlorine Gas: Poisonous by inhalation Liquefied gas Vaporizes rapidly Volumetric expansion: 450 to 1 Heavier than air Punctured Tank Car::  Punctured Tank Car: Manufactured in 1993 tested to 500 psig (¾ inch thick steel shell) Normalized steel Improved fracture toughness Lower ductile-to-brittle transition temperature One of the strongest tank cars in service Minot, North Dakota:  Minot, North Dakota Canadian Pacific Railway January 18, 2002 5 tank cars catastrophically ruptured 147,000 gals anhydrous ammonia were instantaneously released 1 fatality and 11 serious injuries Minot Conclusion::  Minot Conclusion: The low fracture toughness of the non-normalized steels used for the tank shells of the five tank cars that catastrophically failed in this accident contributed to the cars’ complete fracture and separation. Minot Recommendations to FRA::  Minot Recommendations to FRA: Validate a predictive model that will quantify the dynamic forces acting on a tank car during an accident Develop and implement tank car design-specific fracture toughness standards for materials used to manufacture pressure tank cars Chlorine Gas Releases::  Chlorine Gas Releases: 12 Fatalities Graniteville, South Carolina (9) Macdona, Texas (3) Large lethal clouds are generated within minutes Little time to alert citizens Reduction of Public Risk::  Reduction of Public Risk: Operational changes are needed to reduce the vulnerability of tank cars transporting poisonous by inhalation gases. Transportation Studies::  Transportation Studies: The rear one-quarter of a train is the most desirable location for Haz Mat Reducing speed Reducing the length of trains

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