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Stephen Selk PEManager, Investigations

Two Industrial Accidents

involving

Chemical ReactionsSept. 15, 2008

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DisclaimerThe presentation entitled: Three Industrial Accidents involvingChemical Reactions given by Stephen Selk of the UnitedStates Chemical Safety and Hazard Investigation Board onSeptember 15, 2008 at the AIChE SACHE Faculty Workshop is givenfor general informational purposes only. It represents theindividual views of the presenter and all references, conclusionsor other statements regarding current on-going CSB investigations

are preliminary in nature and limited to information that is already inthe public domain. Furthermore, this presentation is not a product ofthe Board and its contents have not been reviewed, endorsed, orapproved as an official CSB document. For specific and accurateinformation on completed investigations, please refer to the finalpublished investigation report by going to the CSB website atwww.csb.gov and clicking on the specific report desired underCompleted Investigations. To the extent this paper includes

statements about the conclusions, findings, or recommendations ofthe Board, such statements come under the general prohibition in 42U.S.C. 7412(r) (6) (G).

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First Chemical Corporation, Pascagoula, MS

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How did it happen?

Unit was shutdown

Mono-nitrotoluene left in tower

Reboiler steam valves leaked

Extended thermal history

Runaway thermal decomposition

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Causes

No formal hazard analysis

Inadequate layers of protection

No documented relief system basis

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T2 Labs, Inc. Jacksonville, FL

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MMTMethyl-cyclopentadienyl manganese

tri-carbonyl

http://upload.wikimedia.org/wikipedia/commons/f/f3/MMT-3D-balls.png

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VIDEO

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P2

P1

vent

CONTAINMENT CHAMBER

TEST CELL

Control

M

QQ

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October 7, 2008

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