An an engineer who worked in refineries in the US its pretty obvious to me that you haven't spent any time at all in a refinery or you'd know that the vast majo

An an engineer who worked in refineries in the US its pretty obvious to me that you haven't spent any time at all in a refinery or you'd know that the vast majority of people in a refinery are not engineers. They are pipe fitters, operators, electricians, welders, machinists, general laborers, managers, admin people, etc. Engineers are a small minority.