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 David Vergun

Senior leaders explain Army’s drawdown plan

Army photograph by David Vergun No commander is happy when notified that a soldier from his or her command has been identified for early separation. But commanders personally notify those Soldiers and ensure participation in th...
 
 
Lockheed Martin photograph by Beth Groom

F-35 Rollout Marks U.S.-Australia Partnership Milestone

Lockheed Martin photograph by Beth Groom Royal Australian Air Force Air Marshal Geoff Brown delivers his remarks at the roll out ceremony for Australia’s first F-35. The official rollout of the first two F-35 Lightning II...
 
 
Air Force photograph by A1C Erin OĆ­Shea

U.S. Forces display military might at Farnborough

Air Force photograph by A1C Erin O’Shea Capt. Tom Meyers discusses the F-15E Strike Eagle’s capabilities with spectators July 17, 2014, at the Farnborough International Airshow in England. Public access was granted ...
 

 
raptors4

Raptors, Falcons fuel up in desert skies

Three U.S. Air Force F-22 Raptors assigned to the 325th Fighter Wing, Tyndall Air Force Base, Fla., fly alongside a KC-135 Stratotanker assigned to the 93rd Air Refueling Squadron, Fairchild AFB, Wash., during Red Flag 14-3, Ju...
 
 
Air Force photograph by A1C Thomas Spangler

Sun sets on Red Flag 14-3

Air Force photograph by A1C Thomas Spangler The sun sets behind a row of F-16 Fighting Falcons during Red Flag 14-3, July 16, 2014, at Nellis Air Force Base, Nev. Red Flag provides a series of intense air-to-air combat scenario...
 
 
Air Force photograph by SSgt. Siuta B. Ika

AOC integral to Red Flag 14-3 operations

Air Force photograph by SSgt. Siuta B. Ika Members of the Air and Space Operations Center work during Red Flag 14-3 operations July 22, 2014, at Nellis Air Force Base, Nev. Armed with personnel from intelligence and communicati...
 




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>