Toughness Properties of a 50-Year-Old Pipeline Material

To ensure the reliable functioning of main pipeline for water transport in hydropower, which has been operational 50 years, a detailed analysis pipeline’s material condition is necessary. The undergoes changing exploitation and working conditions, including extreme load phases such as periodic intensive emptying filling with inspection. In this paper, we analyse resistance NIOVAL47 steel using method determining R-curves three states: Normalised state (2 samples), aged (1 sample) underwent 10% cold deformation was heated 30 min at +250 °C, deformed deformation. test results indicate that analysing material’s states crucial obtaining picture structural integrity NO2500 mm pipeline, operation five decades. study should demonstrate current level reliability order to sustainability energy facility. Additionally, these tests provide realistic necessity introducing an online monitoring system pipeline.