Lesson Learned: Collision Between Tugboat Mark E Kuebler And Tanker Nisalah

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  • On January 22, 2023, a collision occurred between the tugboat Mark E Kuebler and the tanker Nisalah in the Corpus Christi Ship Channel near Ingleside, Texas.
  • The collision resulted in significant damage to both vessels, with estimated costs of $3 million for the tugboat and $3.9 million for the tanker.
  • This analysis delves into the background, event sequence, damage assessment, and contributing factors, highlighting lessons learned from the incident.

Background

The Mark E Kuebler, owned by Bay-Houston Towing Co., and the Nisalah, a VLCC operated by the National Shipping Company of Saudi Arabia, were involved in harbor-assist operations. The tugboat, equipped with azimuthing thrusters, was assigned to assist the inbound tanker through the Corpus Christi Ship Channel.

Event Sequence

The collision occurred during a complex maneuver, involving the Mark E Kuebler transiting near the starboard quarter of the Nisalah. The tugboat’s attempt to position itself alongside the tanker led to hydrodynamic forces pulling it into the larger vessel. Despite efforts to counteract this motion, the collision ensued, causing substantial damage to both vessels.

Analysis of Contributing Factors

The analysis underscores the impact of hydrodynamic forces between vessels in a channel, emphasizing the need for small vessels to maintain a safe operating distance or have sufficient reserve power. The report also stresses the importance of setting speed limits for advanced maneuvers, especially stern-first approaches during harbor-assist operations.

Lessons Learned

The collision highlights the significance of understanding hydrodynamic forces and maintaining a safe distance during maneuvers in close proximity to larger vessels. The report recommends that owners and operators of Z-drive tugboats establish speed limits for specific maneuvers, communicating these limits to ship masters or pilots involved in assisted operations.

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Source: NTSB

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