DEVELOPMENT OF A DOUBLE-WALLED EXTERNAL PRESSURE VESSEL.
NAVAL ORDNANCE LAB WHITE OAK MD
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An innovation in pressure hull construction, characterized by concentric cylinders spaced apart and linked together by circumferential ribs, was examined and found useful for the design of lightweight structures that must survive deep water exposure. A method of manufacture, involving the forming of extruded sandwich plate into cylinders, was demonstrated to be practical. Prototypes were constructed and tested to collapse actual strengths wre found in close agreement with predicted values. It was established that a 21.0 inch diameter structure, constructed as a sandwich shell weighing only 25 pounds per foot of axial length, can achieve a crush strength of approximately 950 pounds per square inch, equivalent to an underwater depth of about 2150 feet. Author