Video shows acid leak inside Philadelphia refinery, then explosion

PHILADELPHIA (WPVI) -- Officials have released new video showing the seconds before a series of explosions rocked Philadelphia Energy Solutions earlier this year, igniting a massive fire.

Hydrofluoric acid can be seen starting to leak out of a failed pipeline and turn into a flammable vapor.

Within a few minutes, a fireball erupts.

Five people were hurt in the June 21 explosion. The plant was eventually shut down.

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Southwest Philadelphia refinery explosions caught on video on June 21, 2019.

Officials say the piping had not been inspected in the last 45 years.

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Earlier this week, the U.S. Chemical Safety and Hazard Investigation Board released a preliminary factual findings report that included a timeline and likely initial cause of the fire.

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Officials release animation of Philly refinery explosion on October 16, 2019.

Investigators found the remnants of the failed elbow pipe, which they said had worn to .012 inches - about half the thickness of a credit card - likely contributing to the release of the flammable vapor.

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The board is continuing its investigation and plans to release a final report with an official cause and recommendations, agency investigators said.

The report is expected in 2020.

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Philadelphia refinery fire extinguished, air monitoring continues. Christie Ileto has more on Action News at 6 p.m. on June 23, 2019.

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