A boiler tube ruptures on a Tuesday afternoon. The unit trips, the maintenance crew isolates the leaking section, welds in a replacement, and by the weekend the plant is back at load. Six weeks later, the same boiler goes down again. Different tube, same bank, same story. This is usually the point where operators start asking the wrong question. They ask which tube failed. The question that actually stops the next outage is why this boiler keeps producing failures in the firs