NTSB Investigation Reveals Hull Deficiencies in Towing Vessel Sinking

The National Transportation Safety Board (NTSB) has concluded its investigation into the partial sinking of a towing vessel on the Lower Mississippi River near Ascension Parish, Louisiana, in March 2023.

Investigators discovered significant hull damage that led to the vessel’s flooding.

The towing vessel, named Uncle Blue, was transporting an empty barge when it began taking on water. During salvage operations, NTSB investigators observed water pouring from holes in the portside shell plating of the lazarette. The nearly 60-year-old vessel exhibited numerous wastage holes and doubler plates, indicating inadequate hull maintenance.

NTSB investigators emphasized the importance of proper hull maintenance, stating, “Although doubler plating can be used as a temporary repair solution, it is not generally suitable as a permanent repair for a vessel’s hull.” They recommended that “Vessel owners should crop out wasted steel on the hull and replace it by inserting new plating instead of covering it up with doubler plating.”

The investigation also revealed that pipe runs inside the hull, previously used for rod placement, were open on both ends and either corroded or missing in some areas. These openings allowed for progressive flooding into the voids and engine room.

Highlighting the importance of proactive maintenance, investigators noted, “Steel hulls are susceptible to corrosion, erosion, and damage over time. To avoid flooding or weakening of the hull, it is good marine practice for owners to conduct regular oversight and maintenance of hulls, including between drydock periods.”

Another contributing factor to the sinking was the absence of a high-water bilge sensor in the lazarette, which prevented early detection of flooding. The vessel’s only sensor was located in the forward end of the engine room.

While no injuries or pollution were reported, the incident resulted in an estimated $500,000 in damage to the vessel.

Read the report: Flooding and Partial Sinking of Towing Vessel Uncle Blue

Unlock Exclusive Insights Today!

Join the gCaptain Club for curated content, insider opinions, and vibrant community discussions.

Sign Up