A lot of our stuff used COG and BFF.Bethlehem up there used blast furnace and coke oven gas in their boilers for the power plant (89-90); wasn't there long enough to figure out if the pipes tarred up...got out when they wanted to put me on swing shift as a supervisor just after the first child was born. Got a sit down engineering job, then...quickly.
Back in the day when American steel was big, money and manpower were almost unlimited.
Once crews shrunk, and budget also...