Underway Replenishment at Sea (UNREP)

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Underway Replenishment at Sea (UNREP) enables sustained naval operations without returning to port. Van Halteren provides integrated UNREP solutions—covering liquids (CONREP) and solids (STREAM/Highline & VERTREP)—with an emphasis on procedural safety, platform compatibility and repeatable performance.

Underway Replenishment at Sea (UNREP)

  • UNREP: transfer of fuel, stores or ordnance while ships maintain steerage
  • Modes include alongside connected replenishment for liquids and solids transfer by STREAM/Highline or VERTREP
  • Engineered for controlled approach, station-keeping and safe breakaway

Simultaneous & Multi-Ship Operations

  • Concepts for simultaneous replenishment (e.g., oiler + DDG/LHD receivers) where doctrine and sea state permit
  • Multi-station setups with segregated liquids/solids workflows

Platforms & Receiver Types

  • Aircraft carriers, destroyers/frigates, amphibious ships and auxiliaries
  • Options to support submarine stores transfer as specified
  • Interoperability workshops to validate interfaces and envelopes

Procedures, Publications & Training

  • UNREP procedures, signals and comms aligned to operating-navy guidance
  • Alignment to ATP-16, NTTP 4-01.4 and related Allied publications during design and trials (on request)
  • Crew training & documentation packages to institutionalise safe evolutions
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FAQ

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What is Underway Replenishment (UNREP)?

UNREP is the overarching term for replenishing supplies at sea, including both liquids and solids, while ships maintain their course. The goal is to extend the operational endurance of naval vessels without them needing to return to a port.

Can liquids and solids be transferred simultaneously?

Yes, our integrated UNREP solutions enable the simultaneous replenishment of both liquids and solids. The systems are designed to separate different workflows for maximum efficiency and safety.

Why is UNREP important for naval operations?

UNREP allows naval ships to stay at sea longer and execute missions without operational interruptions. It increases the fleet’s flexibility and reach, which is essential for modern maritime strategies.

Looking for a solution?
Our team is ready to help

Discuss your UNREP concept of operations, simultaneous replenishment needs and platform constraints with our engineers.

Gerard Oskam

Sales Manager
Worldwide