Mediiim ( 9-inch-ID) Pressiire Vessel. The system in which these 

 vessels are used utilized modified^ surplus^ l6-inch, high-capacity 

 naval shells as pressure vessels » These shells serve as vessels with 

 a usable inside cylindrical cavity 9-^7 inches in diameter by 28o25 

 inches long. The cavity extends beyond the cylindrical portion an 

 additional l8 inches and tapers to S^S^ inches in diameter, providing 

 a total inside length of about 46 inches.. 



These vessels will be equipped with inlets and outlets to permit 

 the internal circulation of sea water at adjustable rates of flow at 

 any pressvire up to 20^000 psi (see Figures 13^ l4, 15, and l6 for details). 



The vessels will be provided with an electrical f eed°thro\agh unit 

 which includes eight entries. The number and types of entries in the 

 feed-through vmit can be varied to meet new requirements as they arise. 



Since the vessels are fabricated from a steel alloy susceptible 

 to attack by sea water, the sea water will be isolated from the steel 

 vessel wall by a pliable bag supported in a stainless-steel mesh with 

 a noncorrosive fluid occupying the space between the bag and the vessel 

 wall. 



As shown in Figure l6^ a number (12 shells available) of these 

 vessels is planned for fabrication to provide enough facilities for 

 conducting both long-term and short-term tests. All will be supplied 

 with pressurized sea water from a chemically controlled storage tank 

 connected to a manifold distribution system. 



The prototype vessel of this system has been fabricated in the KCEL 

 shops and will be tested in FY^SS. Following the testing of the prototype 

 vessel and the accomplishment of any necessary design modifications, it 

 is planned that up to two more such vessels will be fabricated in FY-63. 

 It is expected that this pressure-vessel system will be operational 

 early in FY-63. 



Large (l 8-inch-ID) Pressure Vessel. A pressure vessel with the 

 following general specifications is presently under procurement : 



1. The vessel will have a usable Inside diameter of I8 inches and 

 a usable inside length of 36 inches. 



2o A removable end closure will be provided at one end. This 



closure will be provided with three fluid entries, a top vent, 

 three 220=volt 10-amp electrical entries, and I8 electrical 

 instrumentation entries. 



15 



