Abstract

Pipe from the boiler of thermo power plant with diameter φ45was ruptured in exploitation conditions. In order to determine the reasons for this accident, very complex investigations of the pipe were performed.

As first chemical composition was determined. Ovality and visual inspection of pipe were performed. Mechanical testing include tensile test at ambient and increased temperature of 350 0C. Thickness measurement of the wall pipe was made too. As technological testing flattening test of pipe segments was done. Metallographic investigations consist of determination of non-metallic inclusions, analyse of microstructure and grain size determination. Performed investigations didn’t indicate to defects in material and its processing. So, it can be concluded that working conditions in the boiler mainly overheating temperature caused damage of pipe.