Computer simulation of the processes of deformation of screen tubes of boiler units at a thermal power station with wall thinning due to the intense influence of flue gases has been carried out. The dependences between the maximum stresses in the screen tubes with operational thinnings and the geometrical parameters of the damaged areas of the tubes have been constructed, which allow us to determine the minimum thickness of tubes, for which operating stresses do not exceed a given permissible level. The minimum permissible thickness of the tube in the middle zone of the damaged area has been established. It is shown that the temperature stresses in a pipe under its external heating somewhat compensate for force stresses from the internal pressure.

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