Recently, ClassNK has received several reports for incidents that sea water leakage was detected from distance piece attached to hull on SOx scrubber discharge water line (See Figure 1).
Until now, the leakages were detected at an early stage and did not cause heavy water ingress into E/R.
However, ClassNK has concerns that similar incidents would occur in the future for the other vessels as well and may cause more serious accidents such as a large amount of leakage and water ingress into E/R, thus providing this Technical Information.

Leakages have been detected around welds between "distance piece" and "flange (See Picture 1) or bluff body (See Picture 2)".
Having inspected the distance pieces internally, the corrosion occurred/progressed around the welds and caused the leakages finally.
In some cases, the progress of corrosion which has not resulted in leakage yet was found around the same welds.

(To be continued)