AIP Using Dissolved Oxygen in Seawater. New AIP Concept

The main goal of this publication is to show that dissolved oxygen (DO) extracted from seawater can be used as a real source of oxygen for submarine’s AIP systems. In particular, the feasibility analysis shows that suggested technical solutions enable to provide the submerged operation of 300kW fuel cell AIP system.

Obviously, that sea trial results only will be able to demonstrate feasibility of the technical proposal.

Atmospheric air contacting with seawater is solved in water partially. Essentially, it is concerned of all gases is being contained in air. Theoretically solubility of gases in water is based on Henry law. It is known that the main gases dissolved in seawater are: oxygen (O2), nitrogen (N2) and carbon dioxide (CO2). These gases have maximal partial pressures and relatively low values of Henry coefficient (KH). It provides relatively high solubility of the gases in seawater.

The oxygen solubility in seawater depends on water temperature, depth and salinity. The content of oxygen is considered against to Ocean’s latitudes, littoral waters and open sea, seasons, and time of day. In this connection, it is evaluated the minimal, average and maximal concentrations of oxygen in littoral waters at the typical depth of submarine patrol operations.

To provide the extracting oxygen from seawater with maximal efficiency the pervaporated membrane technology had been selected

The feasibility analysis includes some following steps:

  • Estimation of oxygen productivity;
  • Required power to provide given consumption of oxygen;
  • Approximate evaluation of dimensions and weight of AIP system.


There are some different schematics of AIP system that have to be examined during tests to define the optimal AIP design. Especially, it should be noted that proposed AIP system has principal difference from existing AIP systems.​

This publication is intended for investors that are interested in submarine AIP systems development and, in particular, are ready to invest detailed design, manufacturing and sea trials of systems for dissolved oxygen (DO) extraction from seawater.​

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