Feb 142013

dp2Single fault failures should not be possible in safety critical systems. However, a recent incident in which dynamic positioning failed while divers were underwater show that they can and do happen in ways that, with 20/20 hindsight, are not surprising.

A serious incident occurred in which a diving support vessel’s dynamic positioning (DP) system, designated as IMO class 2, failed resulting in the vessel drifting off position while divers were deployed subsea. Investigations have shown that a probable cause of the DP failure was a single fault which caused blocking of the DP system’s internal data communications. Continue reading »