. Desarrollo de un casco de presión de plástico acrílico esférico para hydrospace aplicación. Casco (arquitectura naval); sumergibles. La carga hidrostática de las cápsulas se realizó en los 18 NCEL pulgadas de diámetro con una vasija de presión de 20.000 psi de presión nominal. Se planteó en una presión de 90 a 110 psi/min tarifa basada en la tasa de descenso de la máxima prevista para la operativa a gran escala del sistema NEMO. La presión se genera con alimentado neumáticamente las bombas de desplazamiento positivo. Su operación ha generado algunas pulsaciones durante el pres- surization, pero la pequeña magnitud de estas pulsaciones (approxima

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. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. Hydrostatic loading of the capsules was performed in NCEL's 18-inch-diameter pressure vessel with a 20,000-psi pressure rating. Pressure was raised at a 90 to 110-psi/min rate based on the maximum planned descent rate for the large-scale operational NEMO system. The pressure was generated with pneumatically powered positive displacement pumps. Their operation generated some pulsations during the pres- surization, but the small magnitude of these pulsations (approximately 10 psi) was considered insignificant for the purpose of these hydro- static tests. In all of the short-term tests, the average pressurization rate of 100 psi/min was maintained until implosion of the model occurred. After implosion, the pressure vessel was opened and the fragments inspected for clues pointing to the source of failure (Figure 69). Prior to performance of the short-term tests to implosion, some of the models were subjected to other types of hydrostatic tests. For example, Models 8 and 15 were subjected to cyclic loading prior to their implosion under short-term test conditions (see Table 6). Although subjecting the same model to other test conditions prior to short-term implosion testing is gener- ally not desirable, the small number of models available for the evaluation of the capsule design made this test policy necessary. Long-term tests were performed on 13 NEMO models (Table 5). These tests were to provide data on the structural response of acrylic plastic hulls to sustained hydrostatic loadings of different magnitudes. After the models imploded under the sustained loading, the duration of loading prior to implosion at a given pressure level would be compared to the short-term implosion pressure. The difference between these pressures would constitute a valid measurement of strength degradation as a function of load duration. Several pressure levels ha