Experimental study of wall thinning behaviour in boiler pipes during bending process

In boilers, there is a need of bent pipes to direct the flow of steam/air in and out of a boiler. Usually bent pipes are preferred than welded pipes. When a pipe is bent, wall thickness of the pipe tends to decrease on the outer side of the bending. When a pipe is not bent properly, it leads to excess wall thinning. Wall thickness is the main criteria that governs the strength of a pipe, because whenever a high-pressure fluid flows through the bend it should withstand the pressure. In cold bending at normal temperature, various fillers are used to reduce the effect of wall thinning. In incremental hot bending, the effect of wall thickness has been studied by varying bend radius of the pipe and percentage change in wall thinning and its effects are observed.