Variant of North American Industry Classification System (NAICS) 2022 Version 1.0 for Energy sector

• E - Energy sector
• 31-33i - E - Manufacturing
• 324i - E - Petroleum and coal product manufacturing
• 3241i - E - Petroleum and coal product manufacturing

32411 - Petroleum refineries

This industry comprises establishments primarily engaged in refining crude petroleum. Petroleum refining involves the transformation of crude oil by such processes as cracking and distillation.