A South Dakota pipefitter suffered fatal burns at an ethanol refinery when ethanol spilled from a process pipe he was working on and was ignited by flames from nearby welding operations.

The incident occurred during an expansion project at the Poet Biorefining-Hudson refinery in Hudson, S.D.

After an investigation into the incident, OSHA issued citations to both the contractor of the project, Bilfinger-Westcon, and Sioux River Ethanol LLC, which owns and operates the refinery. The worker who was killed was an employee of Bilfinger-Westcon, which received five serious safety violations.

Inspectors determined the contractor allowed welding work to occur without verifying that the area was free of flammable liquids.

OSHA cited Sioux River Ethanol LLC for three serious violations of OSHA's process safety management standards including failing to ensure the process pipe being removed did not contain ethanol.

"This death was needless and preventable if critical safety standards had been followed," said Sheila Stanley, OSHA's area director in Sioux Falls. "Communication between the host employer and all contractors is critical in working safely at any site covered by the Process Safety Management Standard. All aspects of permit systems including 'hot work' and line break must be implemented to ensure that welding activities do not occur near line break activities where flammable materials may be released."

Agency investigators found that the pipefitter was removing a vent line on the sixth floor of the refinery's distillation building on May 6, 2016, when the incident occurred. As he detached a nine-foot segment of this line, 190-proof ethanol spilled onto him, flowed through the grated flooring, and ignited on the fourth floor due to the welding operations occurring there. The resulting fire engulfed the worker, causing fatal injuries that led to his death the following day.

The agency cited his employer Bilfinger-Westcon for:

• Conducting welding operations in an area where flammable liquids could be present.
• Failing to provide flame retardant clothing.
• Not training workers in procedures for process safety procedures and hazards, associated with working in a processing facility.

OSHA has proposed penalties of $62,355. Based in Bismarck, North Dakota, Bilfinger-Westcon is a diversified industrial construction company that provides construction services to large industrial processing facilities throughout the nation. View current citations here.

The agency cited Poet Biorefining-Hudson for failing to:

• Inform contractors working at their facility of the hazards related to ethanol processing.
• Implement written procedures to conduct shutdown activities including verifying the process piping did not contain ethanol.
• Ensure safe work practices including controlling the entrance, presence and exit of contract workers within the process area.

OSHA has proposed penalties of $37,413 to the Hudson-based company, a leading producer of ethanol and other biorefined products, operating more than 25 U.S. facilities. View current citations here.