svg]:overflow-visible">Listen to article • 0:00 minThe match was struck without a hiss.In the early hours of a summer Sunday morning, vapors snuck out of an overfilled oil storage tank and snaked through the hulking Gulf Oil Refinery smeared along the Schuylkill in Southwest Philly.What happened next was so destructive, and so deadly, it was assigned a chilling and haunting label: “Refinery Holocaust.”Nightmare fuelAround 6 a.m. on Aug. 17, 1975, the vapors found an ignition source in a nearby boiler house.The overfilled storage tank, which at the time was being filled from a Venezuelan tanker, contained more than 70,000 barrels when the...