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Technical Applications for Underwater Windows

Glass Wall Flood Barriers

Some buildings are situated near rivers, lakes or oceans where the water level can change unpredictably. These buildings have to withstand the worst case-scenario floods, even if that might only happen once in a hundred years. Windows below the waterline of a flood have to keep the water outside the building. Both wall and window have to be specifically engineered.

Ocean views can be retained where formerly bulkheads spoiled the environment with the help of Hydrosight Underwater Windows.

Plant Engineering

Hydrosight underwater windows are very versatile. They have been used in water purification plants for examination of water quality.

Other scenarios:

  • Observation vaults of rivers, streams, coastal areas.
  • Storage tanks for ice.
  • Industrial portholes.

Ship Building

A journey to the submarine world can create memories which are unique and unforgettable. If you're all about exploring the submarine world inside the protection of a hull, you will require a suitable window for the observation of the outside.

Hydrosight's ship windows can be installed either next to the water line, or they can be submerged. They can be used either for maritime observation, as well as for monitoring the floor of the sea.

Hydrosight offers both custom cast submarine windows, certified by a classification society of your choice, and plain windows cut to size, certified by authorities like Germanischer Lloyd.

Acrylic is the material of choice for viewing facilities in a pressurised vessel.


The PVHO rules are written for a water depth of several hundred meters. However underwater windows in ship hulls and in semi submarines are located close to the water surface. For this application PVHO should not be applied. A more interactive approach between the classification society in charge and the marine engineers should be preferred. This approach should include comparisons with similar vessels, applied examination of static of the window structure, material certificates and the like.

QPA stands for Qualitätsprüfung bei Auslieferung. The QPA will result in an acceptance test certificate for individual acrylic blocks in accordance to DIN EN 10204. The QPA test is part of a set of regulations provided by our manufacturer of acrylic blocks. The whole set of certificates enables Hydrosight to provide products according to Germanischer Loyd's classification and building rules. It can be used to certify products to ASME/PVHO. PVHO is mostly used in marine (especially submarine) applications. The QPA test results are provided for special purpose windows, similar to those listed in chapter "Hydrosight Service Contracts"