. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. padeye >. free-sliding fit between pin and opening in equatorial ring equatorial ring padeye .*- acrylic plastic hull permanently attached support framework. Figure 9. Equatorial ring and pin restraint for attaching the acrylic plastic cap- sule to the NEMO service module. Another approach that was considered was an equatorial ring held in place by radial sphere penetrators (Figure 9). The sphere penetrators were to be tapered and made from plastic with elastic pr
. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. padeye >. free-sliding fit between pin and opening in equatorial ring equatorial ring padeye .*- acrylic plastic hull permanently attached support framework. Figure 9. Equatorial ring and pin restraint for attaching the acrylic plastic cap- sule to the NEMO service module. Another approach that was considered was an equatorial ring held in place by radial sphere penetrators (Figure 9). The sphere penetrators were to be tapered and made from plastic with elastic properties matching those of the acrylic plastic hull so that no stress raiser effect would be introduced by them. The fit between the pins and the matching holes in the equatorial ring was to permit sliding of the pins when they move radially inward with the shrinking capsule under hydrostatic loading. The capsule held by the equa- torial ring basically would not be subjected to tensile loading as the major forces generated by lifting of the NEMO system out of water would be shunted around the acrylic plastic capsule via the lifting attachments to the equatorial ring. The only tensile loading acting on the acrylic plastic capsule would be caused here by the dead weight of the capsule suspended from the plastic penetrator pins when being lifted out of water. When floating on the ocean surface, there would be some tensile stresses in the hull, but they would be well distributed around the hull circumference by the radial sphere pene- trators in the equatorial ring. In view of the rather low weight of the capsule and the large wall cross section, the tensile stresses generated by it would be low. Although the equatorial ring method of attaching the capsule to the NEMO service module is not particularly advantageous, it may become so if the NEMO capsules become part of some other system in which it is important to have the capsule attached to the submersible at its equator rather th
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