Figure 66. Large-scale capsule of 66-inch diameter for the NEMO system. 



The pressure levels chosen for the long-term testing program were 

 1,300 psi, 1,200 psi, 1,100 psi, 1,000 psi, 900 psi, 750 psi, 500 psi, and 

 250 psi.* The large spread between the highest and lowest pressures 

 selected for this testing program was based on the rationale that while the 

 high-pressure loadings will cause the models to fail rapidly and thus permit 

 generation of many data points within a short period of time, the low- 

 pressure loadings will show that if the pressure is sufficiently low, implosion 

 under long-term loading will not occur within any reasonable dive duration 

 at operational depth. Using the data from both the high- and low-pressure 

 tests, it will be possible to predict by interpolation the duration of loading 

 preceding implosion for any sustained pressure level. 



* Some tests were performed also at pressures of 4,500 psi, 4,000 psi, 3,500 psi, and 

 3,000 psi, but the model capsules used for those tests were 15-inch-OD x 13-inch-ID 

 (Appendix E). 



