. Sviluppo di una forma sferica in plastica acrilica scafo a pressione per hydrospace applicazione. Scafi (architettura navale); sommergibili. Carico idrostatico delle capsule è stata eseguita in NCEL i 18 pollici di diametro del recipiente a pressione con un 20.000-psi pressione nominale. La pressione è stata aumentata a 90 a 110-psi/min sulla base del massimo previsto tasso di discesa per la grande scala NEMO funzionale sistema. La pressione è stata generata con alimentato pneumaticamente pompe volumetriche. Il loro funzionamento generato alcune pulsazioni durante la pres- surization, ma la piccola grandezza di queste pulsazioni (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

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