Military and Aerospace Electrolyzers (OGP/LPE)

Product Summary
High-pressure oxygen for the US Navy submarine fleet

Product Category



Mission-Critical High-Pressure Oxygen (O2)

Proton-exchange membrane (PEM) technology is now preferred for this most mission critical of applications because of its demonstrated durability (30,000+ hour lifetime), compactness, cleanliness, and reliability. Our most recent Navy electrolyzer stacks utilize advanced technology to support high differential pressures that allow for the generation and eventual elimination of by-product hydrogen at elevated pressure, while supplying breathing oxygen directly to the crew on demand. Proprietary membrane designs enable extremely high purity levels of product gas exceeding 99.999% oxygen. Our PEM cells also operate at much higher current densities than the alkaline electrolyzer units they replace. This has enabled reduction of the size of the oxygen generation system by more than 60%, freeing up valuable space for other submarine elements.

Giner supplies PEM electrolyzer stacks to the US Navy submarine fleet. We are recognized as the technology leader in high-pressure electrolyzer stack operation. Producing one or both gases at high pressure eliminates the need for gas compressors, which can be bulky, troublesome, costly, dirty, and noisy. With our partner, Treadwell Corporation ( we have supplied the Seawolf-Class submarines with OGP (Oxygen Generation Plant) electrolyzers that operate under extreme conditions:

  • 200 bar (3,000 psi) balanced pressure
  • Approximately 1 kg H2 / hour
  • Approximately 8 kg O2 / hour
  • 65 kWh / kg of H2
  • 14.5 kA/m² (1350 ASF) maximum current density
  • Lifetime exceeds 100,000 hours

We are supplying LPE (Low Pressure Electrolyzer) stacks for the retrofit of all Ohio-class submarines. The LPE stacks will also replace the OGP stacks on-board the Seawolf class. This next generation technology has improvements in efficiency, compactness, and space-time yield:

  • Compact high-pressure design
  • 46-260 cm² cells/stack
  • 60-kW electrolyzer
  • 22 kA/m² current density (2000 A/ft2)
  • 55 bar (800 psi) H2/Ambient O2
  • Over 30,000 hours operation at high pressures

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