US Coast Guard exercises structural enhancement option with Vigor Marine for second NSC

The US Coast Guard has exercised a contract option with shipbuilder Vigor Marine for the Structural Enhancement Drydock Availability (SEDA) for the second National Security Cutter (NSC), Coast Guard Cutter Waesche.

This option, worth $14m, was exercised on 13 July.

The structural modifications are necessary to prevent long-term fatigue damage, which otherwise would lead to additional life cycle maintenance costs.

Vigor Marine will complete the contracted work in Seattle.

Waesche is scheduled to arrive at the contractor’s shipyard in September.

The SEDA work is expected to consume around one year.

Work on Coast Guard Cutter Bertholf, which is the first NSC to undergo SEDA, commenced last September and is expected to be completed by this fall.

In the early stages of NSC production, it was determined that structural enhancements would need to be done to the cutters’ design to achieve its three-decade fatigue life.

The Coast Guard and Vigor Marine completed additional analyses and engineering efforts to address the fatigue life concerns, which led to the incorporation of structural enhancements into regular production during the building of the third NSC, Coast Guard Cutter Stratton.

Stratton and all subsequent NSCs come installed with modifications.

Due to construction timelines, Coast Guard cutters Bertholf and Waesche could not secure the structural enhancements during production.

Six NSCs are currently in service, with four based in Alameda, California, and two in Charleston, South Carolina.

The seventh and eighth NSCs, Kimball and Midgett, will be stationed in Honolulu.

In March,  Kimball was christened and is slated for delivery in 2018.

Midgett will be christened in December and is slated for delivery next year.