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 April 24, 2015

News: More than $1 billion in U.S. emergency reconstruction aid goes missing in Afghanistan - A total of $1.3 billion that the Pentagon shipped to its force commanders in Afghanistan between 2004 and 2014 for the most critical reconstruction projects can’t be accounted for by the Defense Department, 60 percent of all such spending under an...
 
 

News Briefs April 24, 2015

German defense minister: widely used rifle has no future A widely used assault rifle has “no future” with the German military in its current form, Germany’s defense minister said April 22, escalating a dispute over the weapon’s alleged shortcomings. Ursula von der Leyen said last month that a study showed the G36 rifle has a...
 
 
Army photograph

Composites key to tougher, lighter armaments

Army photograph XM-360 test firing at Aberdeen Proving Ground, Md., in 2007, is shown. The Army is on the cusp of revolutionizing materials that go into armament construction, making for stronger, lighter and more durable weapo...
 

 

Northrop Grumman signs long-term agreement with Raytheon

Northrop Grumman has entered a long-term agreement with Raytheon to supply its LN-200 Inertial Measurement Unit for Raytheon optical targeting systems. The long-term agreement with Raytheon’s Space and Airborne Systems business extends through 2018. The LN-200 provides camera stabilization on optical targeting systems that conduct long-range surveillance and target acquisition for various...
 
 

NTTR supports first F-35B integration into USMC’s weapons school exercise

The Nevada Test and Training Range was part of history April 21, when four U.S. Marine Corps-assigned F-35B Lightning IIs participated in its first Marine Corps’ Final Exercise of the Weapons and Tactics Instructor course on the NTTR’s ranges. The Final Exercise, or FINEX, is the capstone event to the U.S. Marine Corps Marine Aviation...
 
 
AAR-Textron

AAR awarded new contract from Bell Helicopter Textron to support T64 engines

AAR announced April 22 that Bell Helicopter Textron Inc. awarded its Defense Systems & Logistics business unit a contract providing warehouse and logistics services in support of upgrading T64 engines for the Bell V-280 Val...
 




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>