Viega press fittings gain additional NAVSEA approval

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Viega MegaPress CuNi is made from a 90/10 copper-nickel alloy specially designed to withstand harsh marine environments.

Viega, the first press fitting system to meet the standard for use on US Navy combat vessels, has gained approval for additional components for use aboard.

Last year the Naval Sea Systems Command (NAVSEA) approved the use of Viega MegaPress CuNi press fittings in sizes 1⁄2″ to 2″ for use in surface combatants for a variety of systems, including chilled water, potable water, electronics fresh water cooling, sea water cooling, washing countermeasures, drainage and many more. ProPress copper 1⁄2″ fittings have also been approved for potable water and various drains.

NAVSEA’s new extended approval includes the addition of MegaPress CuNi 90° Elbows, 45° Elbows, Straight Tees, Reducing Tees and Reducing Fittings. This allows shipbuilders and marine personnel to better integrate Viega fittings into on-board systems.

“NAVSEA is arguably the toughest standard in the world and we are proud to have achieved additional approvals for our system,” said TJ Tracy, Marine LLC Director of Viega LLC. “We make the most reliable press fittings in the world and this is proof of that.”

MegaPress CuNi is made of a 90/10 copper-nickel alloy specially designed to withstand harsh marine environments.


Pipe pressing offers the navy, shipyards and contractors two important advantages.

The first is fire mitigation, which is one of the biggest hazards in ship construction, repair and maintenance. There have been more than 600 documented shipboard fires between 2017 and 2020. A recent analysis by the Society of Naval Architects and Marine Engineers found that more than half of fires were caused by hot work, such as welding and brazing.

Because pressing does not require heat, flame, or an external power source, it eliminates the danger of fire when joining pipes. It also makes it unnecessary to have a fire watcher or prepare a job site for hot work.

The second advantage is cost and labor savings. Pressing can reduce installation time by 70% compared to traditional pipe joining methods. When combined with savings when testing systems, the cost and schedule benefits easily outweigh the investment. The National Steel and Shipbuilding Co. (NASSCO), which builds Navy ships, has conducted studies showing that testing pressed pipe fittings is less expensive due to fewer leaks, repairs and retesting.

“The commercial and offshore marine has benefited from dry cleaning for years. And our defense partners have embraced the technology since its initial approval by NAVSEA last year. The new multi-configuration expansion opens the door to additional opportunities, particularly with the maintenance, repair and overhaul of existing vessels,” said Tracy.

In addition to NAVSEA approval, the US Coast Guard, American Bureau of Shipping, DNV-GL, Lloyd’s Register, Bureau Veritas and RINA have all previously approved Viega fittings for use in marine environments.