A firetube boiler consists of many parts, which can be classified as pressure parts and non-pressure parts. The most important and fundamental part is the firetube and the tube sheet. The tube and the tube sheet when constructed together give a shape to the boiler, we can simply say that this is the skeleton of the boiler. During the life cycle of a firetube boiler, there can be an unprecedented occurrence of a tube sheet getting failed over a period of time, or in some cases, it can be a premature failure too. The below chart can be helpful to analyze and identify the cause of a Tube to Tube sheet joint failure in a Firetube Boiler.
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