Vol.22, No.3, 2022, pp. 347–352


Aleksandar Jovanović1*, Branislav Đorđević2, Lazar Jeremić2, Nikola Milovanović2, Tamara Smoljanić2

1) Mont R, Meljak (Belgrade), SERBIA

*email: a.jovanovic@mont-r.rs

2) University of Belgrade, Innovation Centre of the Faculty of Mechanical Engineering, Belgrade, SERBIA



The paper describes the reconstruction procedure of 3 autoclaves, i.e. equipment used for drying raw coal. Due to material degradation in working conditions and damage, the lower part of the autoclave, of steel Altherm 55 (commercially known) is completely replaced by 18 MnMo4-5+NT (commercially known), in order to extend service life of this pressure equipment and increase plant reliability. The reconstruction procedure of autoclaves is presented, i.e., the welding technology for the lower (new) part of the autoclaves. Structural integrity assessment is performed by NDT methods and hydrotests on reconstructed equipment before recommissioning, as well as for the strict criterion of the quality requirement of welded joints exposed to dangerous working fluids.

Keywords: autoclave, pressure vessel, reconstruction, NDT, structural integrity

full article (1.09 MB)