What is most often mistaken for oil in propane is actually sodium hydroxide (soda caustic) which is used to remove trace amounts of sulfer during the final scrubbing stage of commercial propane...Trace amounts may carry over during scrubbing, and to the touch it is uber viscous and indistinguishable from oil, but is corrosive...Over time this liquid caustic can accumulate in the belly of LPG transport rail cars, referred to as ‘heal’ and is purged out when rail cars are shopped for periodic inspection and servicing..
3 tons