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Vol.15, No.3, 2015, pp.147–151 |
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ANALYSIS OF CAUSES OF DEGRADATION OF PARENT MATERIAL AND WELD METAL OF BREECHES PIPE AT HYDRO POWER PLANT ‘PERUĆICA’ Simon Sedmak1, Miodrag Arsić2, Darko Bajić3, Mladen Mladenović2, Zoran Savić2, Suzana Koprivica4 1)University of Belgrade, Innovation Centre of the Faculty of Mechanical Engineering, simon.sedmak@yahoo.com 2)Institute for Materials Testing, Belgrade, Serbia 3)University of Montenegro, Faculty of Mechanical Engineering, Podgorica, Montenegro 4)University “Union – Nikola Tesla”, Faculty for Management in Civil Engineering, Belgrade, Serbia |
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Abstract Results of non-destructive tests performed on the parent material and welded joints of structural parts of a breeches pipe (collar and anchor) are presented, as well as results of destructive tests performed on the anchor parent material. Non-destructive testing included visual (VT), magnetic particle (MT), and ultrasonic testing (UT), while destructive tests included determination of chemical composition, tensile properties, impact energy and hardness. Based on test results it is established that the major cause for the occurrence of damage in the carrying structure of the breeches pipe no.1 of pipeline III, and between the pipeline and anchor, is in the fact that the breeches pipe started to lean, not on the collar, as specified by design, but on the anchor that could not endure all loads occurring in service. Keywords: breeches pipe, material degradation, welded joints |
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