Construction workers preparing to weld a crude oil pipeline connection on Friday night were burned and airlifted to hospitals after the Port Arthur area Sunoco pipeline experienced a flash fire.
"There was welding, a crude oil line and fumes," said Jeff Shields, Sunoco Logistics spokesman, who was at the site with officials from the contractor, Houston-based L-Con Inc.
Four of the workers were taken to burn centers in Houston, Galveston and Beaumont, Texas on Friday, said Shields. The other three were treated for minor injuries and released.
L-Con provides construction management services to energy customers and heavy industrial installations.
OSHA was on site and its investigation will focus on what safety procedures were followed and what caused the fire at 9 p.m. on the eastern edge of the terminal near the Neches River.
Sunoco operates a marine terminal on the site, as well as 130 above-ground storage tanks with a storage capacity of 24 million barrels of crude oil plus condensate, naphtha, base and extract oils.