We got were dispatched for a barn fire around 17:00hrs. On arrival we had heavy smoke pushing from second floor windows and decent smoke on the first floor, we named a defensive strategy. The OIC of our Wagon had the FFs stretch a 2.5 inch line and attack the fire defensively from side A. Just as they opened the large door at the A-B side, a one pound propane cylinder let loose. I was walking around the engine to open my piston intake valve and saw two of my guys air born for ten feet. They hit the ground and then I focused on the large fire ball that erupted from the door and all other openings in the area. The Fire Marshal later found the cylinder and told us that it was equivalent to two sticks of dynamite going off. After seeing the guys and the fire ball my heart stopped until both of the guys got up, brushed themselves off and grabbed their line and went back to work. I am only 26 years old, but man I am too old for these types of close calls. The investigator said it was the equivalent of two sticks of dynamite!
Needless to say we were a little more cautious of the contents for the remainder of the fire. After doing our investigation we found the propane cylinder and the flammable liquid style cabinet that it was sitting on. I enclosing a picture of the cylinder, but the cabinet picture did not turn out. The cabinet was smashed down two feet on the top due to the explosion. The crew got a good stop on the fire. We got the tower to flow below grade and knocked a bunch of fire and the Truck took care of the rest. They saved all the property on the second half of the structure.