Defense

January 5, 2014

NAVSEA Completes Waterjet Seal and Evaluation on USS Fort Worth

The littoral combat ship USS Fort Worth (LCS 3) transits San Diego Bay on its way to conduct routine training operations of the coast of Southern California.

WASHINGTON (NNS) — Naval Sea Systems Command (NAVSEA) and Southwest Regional Maintenance Center (SWRMC) divers recently completed the first full underwater waterjet seal and evaluation on a littoral combat ship (LCS), USS Fort Worth (LCS 3), the Navy announced, Jan. 2.

LCS class ships are unique to the U.S. Navy because they use waterjets instead of propellers for propulsion. Each waterjet draws seawater in through a duct, increases the water’s pressure and then ejects it, causing the ship to move.

To protect these waterjets from internal corrosion, the LCS class uses what’s known as a cathodic protection system, a system by which the waterjets are equipped with sacrificial metal structures that are specifically designed to corrode. Because these structures – known as anodes – corrode so easily, it keeps the rest of the waterjet structure safe from rusting or pitting.

On Freedom-variant ships, the anodes installed on the waterjets need to be inspected and replaced every four months. NAVSEA’s Supervisor of Salvage and Diving (SUPSALV) was tasked to develop a procedure to replace these anodes at sea, instead of having to conduct the replacement in a dry dock.

Working with the ship’s operators and the in-service LCS program office, SUPSALV engineers developed a plate to seal the waterjet inlet, as well as external patches to isolate the waterjet, creating a dry environment. This allowed maintenance teams to inspect and replace the zinc anodes while the ship was waterborne.

“It is important to have this underwater process to provide a cost effective, timely, and manageable procedure to the LCS fleet,” said Joe Theodorou, SUPSALV program manager. “Having this capability saves the Navy $100 million in dry dock costs in the San Diego area.”

With the procedure complete for Freedom-variant littoral combat ships, SUPSALV will begin testing a similar process for Independence-variant ships. Though both variants use waterjets for propulsion, there are significant differences in their design. Testing on Independence variant ships is expected to complete by March 2014.

The Office of the Director of Ocean Engineering, Supervisor of Salvage and Diving is part of the Naval Sea Systems Command and is responsible for all aspects of ocean engineering, including salvage, in-water ship repair, contracting, towing, diving safety and equipment maintenance and procurement.

For more news from Naval Sea Systems Command, visit www.navy.mil/local/navsea/.




All of this week's top headlines to your email every Friday.


 
 

 
Army photograph by C. Todd Lopez

Smart-mortar will help Soldiers more effectively hit targets

Army photograph by C. Todd Lopez Nick Baldwin and Evan Young, researchers with the Armament Research Development and Engineering Center at Picatinny Arsenal, Pennsylvania, discuss the 120mm Guided Enhanced Fragmentation Mortar ...
 
 

Air Force assigns new chief scientist

The Air Force announced the service’s new chief scientist to serve as a science and technology adviser to the secretary of the Air Force and the chief of staff of the Air Force, May 21. Dr. Greg Zacharias will be the 35th chief scientist and is ready to “dive in” to his new role. “I...
 
 

TSgt promotion release delayed to allow system validation

Technical sergeant promotion selection results, originally scheduled for release May 28, will be delayed to enable the Air Force to continue to validate extensive system changes to the Weighted Airman Promotion System, officials announced. The 15E6 technical sergeant promotion cycle is the first to incorporate recent changes in the enlisted evaluation and promotion system. Recent...
 

 

Freedom completes rough water trials

The littoral combat ship USS Freedom completed Seakeeping and Structural Loads Trials, commonly referred to as Rough Water Trials in late March the Navy reported May 21. The U.S. Navy must demonstrate the seaworthiness and structural integrity of each new ship class. One of the primary ways the Navy verifies these qualities is through a...
 
 

Air Force releases Strategic Master Plan

The Air Force officially released the Strategic Master Plan May 21, which is the latest in a series of strategic documents designed to guide the organizing, training and equipping of the force over the coming decades. The SMP builds on the strategic imperatives and vectors described in the capstone document, America’s Air Force: A Call...
 
 

HYT extension possible for SrA-MSgt in 35 career fields

Eligible senior airmen, staff sergeants, technical sergeants and master sergeants in 35 Air Force specialties will be able to apply for a high year of tenure extension and, if approved, will be able to extend between 12 and 24 months past their current HYT. The Air Force is introducing several personnel and manpower initiatives to...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>