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.


 
 

 

Headlines March 2, 2015

News: Israel lobbies for more missile defense funds than Obama sought - For the second consecutive year, Israeli officials have asked the U.S. Congress to add more than $300 million to President Barack Obama’s budget request for their nation’s missile-defense programs.   Business: Inside one of the most intense, and unusual, Pentagon contracting wars - The much-anticipated...
 
 

News Briefs March 2, 2015

Italy resumes Navy exercise amid new tensions over Libya The Italian Navy is resuming exercises in the Mediterranean Sea, including near the coast of Libya, amid concerns about rapidly deteriorating security in the North African nation. The exercise began March 2 and includes anti-submarine, anti-aircraft and anti-ship training operations. The exercise was suspended for a...
 
 
LM-AEHF

Ingenuity drives Lockheed’s AEHF program to production milestone early

Lockheed Martin has successfully integrated the propulsion core and payload module for the fourth Advanced Extremely High Frequency (AEHF) satellite nearly five months ahead of schedule. Reaching this critical milestone early a...
 

 

First all-electric propulsion satellites send first on-orbit signals

Two Boeing 702SP (small platform) satellites, the first all-electric propulsion satellites to launch, have sent initial signals from space, marking the first step toward ABS, based in Bermuda, and Eutelsat, based in Paris, being able to provide enhanced communication services to their customers. Whatís more, the satellites were launched as a conjoined stack on a...
 
 

GA-ASI, Sener team to offer Predator B to Spain

General Atomics Aeronautical Systems, Inc. and SENER, a leading Spanish engineering company, announced March 2 that they have signed a teaming agreement that promotes the use of the multi-mission Predator B® RPA to support Spain’s airborne surveillance and reconnaissance requirements.  GAASI is a leading manufacturer of Remotely Piloted Aircraft systems, radars, and electro-optic and relate...
 
 
raytheon-satellite

Raytheon’s ‘Blue Marble’ imaging sensor delivered on schedule

Raytheon has delivered a second Visible Infrared Imaging Radiometer Suite instrument to support the National Oceanic and Atmospheric Administration’s Joint Polar Satellite System mission. The second VIIRS unit will fly ab...
 




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>