Underway Replenishment Keeps Our
Ships at Sea
Naval Surface Warfare Center, Port Hueneme Division has provided
Underway Replenishment (UNREP) engineering services to the Navy’s surface fleet
since 1963. UNREP enables aircraft carriers, surface combatants, and amphibious
ships to remain underway at sea indefinitely in support of our national
Replenishment while underway, UNREP, involves the transfer of all
consumables from supply ships to the customer ships while both are underway.
Items such as fuel, food, ammunition, repair or replacement parts, and
personnel are routinely transferred at sea.
Navy’s Only Underway
Replenishment Test Site
Port Hueneme has the only fully equipped and operational UNREP test
site. This test site contains modern constant tensioned fueling and cargo
systems with Navy standard equipment that represents the latest configurations
for both the delivery and receiving parts of the system. The test site has many
As a test site, it is used to fully test new systems, equipment, and
configurations. Any new UNREP development can be thoroughly tested under the
controlled conditions, safety, and economy of this dedicated land-based
As a training site, it is used extensively to
train both Navy and civilian crews. Because the Navy standard equipment
installed at the test site represents the latest design and highest population
of UNREP equipment in the fleet, the training provided in equipment operation
and maintenance, as well as system operation, is the most effective land-based
UNREP training available.
As a demonstration site, it is used to
demonstrate UNREP procedures, systems, equipment, and new developments to
sponsors, fleet representatives, VIPs, foreign military representatives, and
public and private tour groups.
As a fleet technical assistance site, it is used
to simulate or duplicate UNREP problems reported by the fleet and to develop
special repair procedures.
As an overhaul site, it is used to overhaul and
test items turned in by the fleet and return them in operational condition.
New UNREP Technology
Our Underway Replenishment experts continue to be busy as the fleet’s
full service UNREP agent, maintaining crucial capabilities that permit our Navy
to remain at sea for as long as necessary.
At the same time, the UNREP division has embarked on the development of
new technology for replenishment at sea. NSWC PHD was selected by the Office of
Naval Research (ONR) to conduct the development of a new UNREP transfer system
concept to meet expeditionary logistics objectives.
The new technology, referred to as Heavy UNREP, was initiated by the
ONR Future Naval Capabilities Program to develop and demonstrate at sea an
advanced concept UNREP transfer system. The concept objective is to reduce the
current UNREP time by 50 percent, increase capacity to 12,000 pounds, transfer
in higher sea states (rough weather conditions) and with a 40 percent reduction
NSWC PHD’s plan for creating Heavy UNREP will advance UNREP
state-of-the-art technology by use of constant tension methodology coupled with
tailored transfer options. Included in the planning is the flexibility to
service legacy ships.