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An investigation of floor tube problems in chemical recovery boilers was carried out focussing primarily on cases of overheat and thermal fatigue. Seventy incidents were analyzed and grouped into six different cause categories. Thirty-four of these incidents were classed as overheat and another nine as thermal fatigue at tube bends. There were significant differences in experiences between decanting bottom and slant floor units and for carbon steel vs. composite tubes. The study summarized the state of knowledge of the cause of these problems and made recommendations with respect to research and development needs.
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Investigation of Industry Experience with Floor Tube Problems in Recovery Boilers, 2003 Fall Technic