Last Friday around 4 am there was a series of three explosions and a massive fire at the Philadelphia Energy Solutions (PES) Refining Complex, the East Coast’s oldest and largest oil refinery. It took fire fighters until Saturday afternoon to extinguish the blaze. The main concern was that if the fire reached a tank of hydrofluoric acid used in the refining process it would be released as hydrogen fluoride (a poison), affecting nearby residents. Fortunately that didn’t happen. The thing about the story that caught our attention is that propane and butane (potentially sourced from the Marcellus) are what fed the fire.