NAVSEA Completes Waterjet Seal and Evaluation on USS Fort Worth

Posted by Eric Haun
Thursday, January 02, 2014
USS Fort Worth (LCS 3). U.S. Navy photo by Senior Chief Mass Communication Specialist Donnie W. Ryan

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 drydock 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.

navy.mil
 

Maritime Reporter June 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Marine Propulsion

Desulfurization of Exhaust Gases in Shipping

Are shipowners prepared to enter SECA zones?   Due to existing regulations on air exhaust emissions from the International Maritime Organization (IMO), and with

Cummins Reports Revenue Jump in Q2 2014

Cummins Inc. reported its results for the second quarter of 2014. According to the report, second quarter revenue of $4.8 billion increased 7 percent from the same quarter in 2013.

Master Marine Delivers Z Drive Towboat

Master Marine, Inc. delivered its first 2,000 hp Z Drive inland river towboat last month. The towboat represents the first vessel (Entech Design) of this series by the yard.

Navy

USNS Ship Rescues Nine in Gulf of Oman

'USNS Richard E. Byrd' (T-AKE 4), a Lewis and Clark-class dry cargo ship, rescued 9 crew members from a Yemeni-flagged cargo vessel 'Asaed' that had lost power,

HMS Prince of Wales Delivery Begins

A huge section of hull for HMS Prince of Wales, the second aircraft carrier being delivered to the Royal Navy, has today departed BAE Systems in Glasgow on a 600-mile

Today in U.S. Naval History: July 28

Today in U.S. Naval History - July 28 1915 - Sailors and Marines land in Haiti to restore order 1916 - Navy establishes a Code and Signal Section which initially

Marine Power

Desulfurization of Exhaust Gases in Shipping

Are shipowners prepared to enter SECA zones?   Due to existing regulations on air exhaust emissions from the International Maritime Organization (IMO), and with

Cummins Reports Revenue Jump in Q2 2014

Cummins Inc. reported its results for the second quarter of 2014. According to the report, second quarter revenue of $4.8 billion increased 7 percent from the same quarter in 2013.

Master Marine Delivers Z Drive Towboat

Master Marine, Inc. delivered its first 2,000 hp Z Drive inland river towboat last month. The towboat represents the first vessel (Entech Design) of this series by the yard.

News

Total Sells ts Coal Mining Assets to Exxaro

Total has signed an agreement with Exxaro Resources Ltd for the sale of its 100% stake in Total Coal South Africa (TCSA), its coal-producing affiliate in South Africa.

Crew of USCG Cutter Thetis to Return today

The crew of the Coast Guard Cutter Thetis, a 270-foot medium endurance cutter based out of Key West, Florida, is scheduled to return to homeport Tuesday at 11:45 a.

Control of Emission from Vessels in Hong Kong Waters

Amendments to the Shipping and Port Control Ordinance (Cap. 313) and the Merchant Shipping (Local Vessels) Ordinance (Cap. 548) to enhance the control of dark

Marine Equipment

MTN Lands Cruise Line SatCom Contracts

MTN Communications (MTN) says that three cruise operators around the world have selected the company for its passenger, crew, corporate communications and content services.

Cummins Reports Revenue Jump in Q2 2014

Cummins Inc. reported its results for the second quarter of 2014. According to the report, second quarter revenue of $4.8 billion increased 7 percent from the same quarter in 2013.

Master Marine Delivers Z Drive Towboat

Master Marine, Inc. delivered its first 2,000 hp Z Drive inland river towboat last month. The towboat represents the first vessel (Entech Design) of this series by the yard.

Eye on the Navy

HMS Prince of Wales Delivery Begins

A huge section of hull for HMS Prince of Wales, the second aircraft carrier being delivered to the Royal Navy, has today departed BAE Systems in Glasgow on a 600-mile

South Korean Teens: Left to Escape Sinking Ferry

Students testify no help came from crew; Coastguard rescuers were passive, only pulling passengers out. Crew in a state of panic, witness says. Six teenagers

House Subcommittee Hearing Highlights “Dismal State” of U.S. Icebreaking Capability

At the July 23, 2014, hearing of the House Subcommittee on Coast Guard and Maritime Transportation on “Implementing U.S. Policy in the Arctic” the committee chairman, Rep.

Vessels

U.S. Marshalls Ordered to Seize Kurdish Oil Cargo off Texas

Acting on a request from the central government in Iraq, a U.S. judge has signed an order telling the U.S. Marshals Service to seize a cargo of oil from Iraqi Kurdistan

Aker Philadelphia Shipyard ASA: Purchase of own shares

Aker Philadelphia Shipyard AKPS), a leading U.S. commercial shipyard constructing vessels for operation in the Jones Act market, has on July 25, 2014 purchased 1,

Danaos Corporation 2Q and 1H 2014 Results

Danaos Corporation ("Danaos") (NYSE: DAC), a leading international owner of containerships, today reported unaudited results for the period ended June 30, 2014.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Naval Architecture Navigation Pod Propulsion Salvage Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1739 sec (6 req/sec)