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Submersibles. Hydrostatic pressure test. Pressure hull and buoyancy materials algolia-ignore This is caused by a1 Scope This document specifies a test method for the hydrostatic pressure test for pressure hull and buoyancy materials of submersibles. The test sequence comprises a tightness test and the hydrostatic pressure test itself. It can also include continuous pressurization and depressurization tests, long term static load and cycling external pressure tests. This document is applicable to the pressure structure of manned submersibles and unmanned