. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. Figure 69. Removal of imploded 15-inch-diameter capsule from the 18-inch-diameter pressure vessel. Models were tested under long-term loading conditions in hydrostatic pressure vessels specially built for this project. The pressure was raised at a 100-psi/min rate to the desired pressure level by pumping tap water into the vessel with pneumatically powered positive displacement pump. When the desired pressure level was reached, the line to the pump was closed. Since
. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. Figure 69. Removal of imploded 15-inch-diameter capsule from the 18-inch-diameter pressure vessel. Models were tested under long-term loading conditions in hydrostatic pressure vessels specially built for this project. The pressure was raised at a 100-psi/min rate to the desired pressure level by pumping tap water into the vessel with pneumatically powered positive displacement pump. When the desired pressure level was reached, the line to the pump was closed. Since the pressure inside the vessel varied from day to day because of variations in room temperature and the progressive contraction of the hull under hydro- static loading, daily pressure corrections were necessary. These pressure corrections were accomplished by opening the valve in the pipe connecting the vessel to the pump and increasing the pressure, or by opening the valve in the drainline and decreasing the pressure. The day-to-day pressure varia- tions were general ly less than 10 psi, although on some occasions they were as large as 70 psi when sudden temperature changes took place in the uninsulated building where the vessels were located. The models undergoing the long-term tests were not filled with water prior to placement in the vessel, but were simply vented to the ambient atmosphere. Because of the large buoyancy that the models possess, lead ballast was attached to the bottom plates in the models. This test condition better simulated the loading conditions to which a large-scale capsule will be 103. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stachiw, Jerry D. , 1931-; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : U. S. Naval Civil Engineering Laboratory
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