INTEGRITY AND RISK ASSESSMENT OF RECONSTRUCTED STEAM LINE

Abstract

The integrity assessment of high pressure steam pipeline primarily requires stress state determination, including not only effects of working pressure and temperature, but also all acting loads. Toward this aim, the application of numerical methods for calculating the stress state is the best option. Here, the integrity assessment of one of the collectors of the RA line at Block 1 of ‘Nikola Tesla’ B Thermal Power Plant is shown, which was the subject of reconstruction due to a manufacturing defect in one of the welded joints. Integrity and risk of the steam line is assessed using fracture mechanics parameters, including microstructural analysis.

Procena integriteta parovoda pod visokim pritiskom zahteva prvenstveno utvrđivanje naponskog stanja materijala, pri čemu treba uzeti u obzir ne samo uticaj radnog pritiska i temperature, već i sva delujuća opterećenja. Primena neke od numeričkih metoda proračuna za analizu naponskog stanja je najbolji alat. Ovde je prikazana je procena integriteta jednog od kolektora RA linije na Bloku 1 Termoelektrane ’Nikola Tesla’ B koji je bio predmet rekonstrukcije zbog greške na jednom od zavarenih spojeva. Integritet i rizik parovoda je procenjen primenom parametra mehanike loma, uz analizu mikrostrukture.