The Chemical Safety and Hazard Investigation Board (CSB; Washington) says chemical plant and refinery operators should take extra precautionary measures when performing work forward piping that may contain hazardous materials.

The Chemical Safety and Hazard Investigation Board (CSB; Washington) says chemical plant and refinery operators should take extra precautionary measures when performing work forward piping that may contain hazardous materials. The safety bulletin is in answer to CSB's investigation into the January 2004 accident

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