The flame at the top of a 400-foot stack here at the Flint Hills Resources' Pine Bend refinery used to burn ... flares are essential pieces of safety equipment used to burn any excess gases ...

Read More Founded in 2001, Delek US Holdings, Inc. (NYSE: DK) is a highly diversified, downstream energy company with assets in petroleum refining, biodiesel production, renewable fuels ...

It is one of the largest independent petroleum refiners and suppliers ... will be closely monitoring the startup of the refinery's new equipment. "We are fully aware there's always risks when ...