Sea-Water Supply Systeni o Sea water will be supplied to the pressure- 

 vessel systems from two large plastic-lined^ covered tanks- The chemical 

 and physical properties of this water will be adjusted and monitored so 

 as to duplicate as nearly as possible the environment of the ocean as 

 determined to exist in the waters at any selected deep-ocean test site. 

 Natural sea water will be used as the raw material for simulating deep= 

 ocean sea water, 



Atmosphe ric-Pressure Sea°Water Exposure Tank. In order to permit 

 the evaluation of the contributions of high hydrostatic pressure to any 

 of the effects observed in laboratory pressure=¥essel experiments, a 

 small closed plastic=lined tank^ supplied with "controlled" sea water^ 

 will be available for exposing specimens at sea=level ambient pressures. 



Miscellaneous Test Fixtu res and D evices. Various special=purpose 

 devices have been designed and fabricated as the need for them occurred. 

 These include: 



Pressure lead -t hrough ° 1^^000 psi. A miniaturized version 

 of the lead "through system used on the Marine Physical Laboratory's 

 RUM vehicle was developed to provide electrical entries into the 1-1/2- 

 inch pressure vessel. See Figure 17. 



Lead -through proof -test bomb. In order to proof -test various 

 proprietary lead -through devices, a small bomb assembly was designed. 

 Various lead-throughs were tested to 15,000 psi with this device. See 

 Figure l8. A room-temperature vulcanizing silicone rubber was used to 

 seal the threaded joint between the connector and the holder. No leaks 

 developed at pressures of 15,000 psi during test periods as long as 30 

 hours. The test bomb in its safety shield is shown attached to the high- 

 pressure pump in Figure 14. 



Stress corrosion rack . A special fixture fabricated from 

 stainless steel and polyetheylene is shown in Figure 19. This fixture 

 will hold l6 stress-corrosion jigs of the type illustrated in Figure 5. 

 By means of this rack, these jigs and specimens can be exposed to a 

 high-pressure sea-water environment in either the 9-inch or l8-inch 

 pressure vessels. 



Ten sile stres3_corrosion jig. A stainless-steel and plastic 

 tensile-stress jig is shown in Figure 20. This jig is designed to place 

 tensile-test specimens \inder stress for exposure in pressure vessels. 

 FigTxre 21 is an exploded view of this jig showing the plastic sleeves and 

 washers which provide electrical insulation between the specimen and the 



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