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Monday evening I was working on some utensils. I had the belt sander going, the dust collector going and the radio playing loud enough to be heard over the noise made by the other two. As I was sanding this spoon, I heard a couple of metallic pops. I looked around a bit, but could never determine the source of these pops. I just shrugged it off and assumed that a small chunk of wood that had been lodged in the dust collector hose had finally come loose and hit the fan on its way into the hopper. This happen occasionally.
However, when I finished sanding the spoon and stepped back from the belt sander, I noticed
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I don't know exactly what happened, but obviously the tank ruptured with enough force to split the seam in the outer skin. I would have loved to pull off the outer skin and see exactly what the rupture looked like, but I didn't think that was a good idea since I needed to return the hot water heater. I can't think of anything that I could have done to cause the rupture. It was evidently just a manufacturer's defect.
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(BTW: The flex line nut is still leaking just a little bit. I probably should have changed out the flex line and/or the pipe nipple where it attaches.)