Archive image from page 93 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 58. Operational 15-inch-diameter model acrylic plastic capsule for NEMO system: disassembled. The large-scale test series consisted of a single 66-inch-OD and 61-inch-ID acrylic plastic hull equipped with operational end plates of type 316 stainless steel (Figure 66). The hull, as previously described under 'Fabrication Process,' was fabricated in much the same way as the model hulls. The bottom plate w
Archive image from page 93 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 58. Operational 15-inch-diameter model acrylic plastic capsule for NEMO system: disassembled. The large-scale test series consisted of a single 66-inch-OD and 61-inch-ID acrylic plastic hull equipped with operational end plates of type 316 stainless steel (Figure 66). The hull, as previously described under 'Fabrication Process,' was fabricated in much the same way as the model hulls. The bottom plate was a faithfully scaled-up copy of the operational bottom plate in the model NEMO with the exception of the internal retain- ing flange, which was bolted to the bottom plate instead of being threaded to it (Figure 67). The top hatch was also a scaled-up version of the operational hatch used in the NEMO models (Figure 68). The only differ- ence between it and the working hatches in the models were the use of a bolted-on, instead of screwed-on, retaining flange (Figure 67) and the use of a planetary gear system, instead of a cam system, for the locking and unlocking mechanism. (For detailed dimensions, see Appendix A.) Preten- sioned tie rods were not used as (1) there would not be sufficient room for them in a 66-inch capsule for manned operations and (2) absence of the rods subjected the hull to a more severe test condition in the pressure vessel than the capsule would see in actual service, where the external cage would resist the downward pull of external ballast. Testing Program for Capsules The capsule test specimens were tested for their structural integrity mostly by external hydrostatic loading. This type of loading was selected because it represents (1) the most severe loading condition to which the structure will be subjected in the ocean and (2) it is the loading condition 90
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