Integrity assessment of autoclaves after reconstruction procena integriteta autoklava nakon rekonstrukcije

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 (commer-cially known) is completely replaced by 18 Mn Mo4-5+NT (commercially known), in order to extend service life of this pressure equipment and increase plant reliability. The recon-struction procedure of autoclaves is presented, i.e., the weld-ing technology for the lower (new) part of the autoclaves. Structural integrity assessment is performed by NDT methods and hydrotests on reconstructed equipment before recommis-sioning, as well as for the strict criterion of the quality require-ment of welded joints exposed to dangerous working fluids.