Oil Refinery Explosion Injures 20 in WisconsinMay 1, 2018 — At least 20 people were injured when a tank containing crude oil and asphalt exploded at an oil refinery in Wisconsin.

A series of fires and explosions at the Husky Energy oil refinery forced an evacuation of 27,000 people in the town of Superior, Wisconsin on April 26.

A worker in the building said the explosion sounded like “a sonic boom” and happened when the plant was being shut down for repairs.

Once the fires were extinguished, investigators determined that the initial explosion was in the fluid catalytic cracking unit, which is a part of the distillation process where crude oil is heated to make gasoline.

Experts are now investigating whether any flaws or cracks in the metal tank could have caused the unit to fail.

They are still concerned about air quality and any release of hydrofluoric acid, a strong acid that can cause serious health problems in people who breathe it in the air, according to the CDC.

On May 1, the EPA said it has finished monitoring the air at the site and found no elevated levels of anything toxic.

The refinery dates back to the 1950s. It can process around 50,000 barrels per day and storage up to 3.6 million barrels of crude, asphalt, and oil products from the Canadian tar sands or North Dakota.

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