INTEGRITY ASSESSMENT OF TANKS WITH MICROCRACKS IN WELDED JOINTS
Radomir Jovičić1, Sanja Petronić1, Simon Sedmak1, Uroš Tatić1, Katarina Jovičić2
1)University of Belgrade, Faculty of Mechanical Engineering, Innovation Centre,
2)Goša Institute, Belgrade
During the exploitation of tanks used for storing liquid carbon dioxide there was a need to install two new connectors on one of the lids. The tank is made of micro-alloyed steel and its connectors are made of high-alloyed austenite steel. The same welding technology and added materials are used for both the tank and connectors. Non-destructive testing methods of welded joints in new connectors revealed microcracks in the heat-affected zone of micro-alloyed steel. By applying the procedure given in standard BSI PD 6493 “Manual for assessment of acceptability of flaws in welded structures”, it is possible to estimate the effect of these microcracks on the integrity of welded joints in new connectors, and therefore their effect on the integrity of the tank.
Keywords: welded joints, tank, crack, integrity