Sources familiar with the wreckage at the Philadelphia refinery have revealed that the Alkylation unit at the site has been completely destroyed in the fire. The 335,000 barrel-per-day (bpd) Philadelphia refining complex was engulfed in fire on Friday, setting a number of explosions. The wreckage is said to hamper the supply of gasoline from the region’s largest refinery, owned by Philadelphia Energy Solutions (PES).