SUMMARY 



Phase I 



Off-the-shelf flanged glass pipe can be used to provide transparent, 

 nonmagnetic instrument housings of very simple and inexpensive construction 

 for use in the ocean. Depending on the size requirements, the Pyrex glass 

 pipe tested in this study has a depth capability ranging from 2,000 feet to 

 the greatest depths in the ocean for one-time (no cycling) use. 



Phase 1 1 



1. Of the readily available materials tested, 6061-T6 aluminum proved the 

 most satisfactory for use in a simple end plate-to-glass (without bearing 

 gaskets) closure system for one-time service. 



2. For limited cyclical service, naval brass appears to be the best choice in 

 a simple end plate-to-glass (without bearing gaskets) closure system. 



3. Of the various bearing gasket systems tested, fiber-reinforced neoprene 

 washer (Fairprene 5722A), the Vespel washer (6061-T6), and the aluminum 

 washer system showed the most promise. 



Phase 1 1 1 



1. A prototype light housing utilizing 1-1/2-inch-ID glass pipe was designed, 

 constructed, and tested; it was found to be useful for cyclical service at 

 depths to 5,000 feet. 



2. A prototype instrument housing utilizing 4-inch-ID glass pipe was 

 designed, fabricated, and tested; it was determined to be useful for cyclical 

 service to depths of 2,000 feet. 



CONCLUSiON 



Flanged glass drain pipe provides a useful, inexpensive, transparent 

 capsule material for enclosing lights and instruments for undersea use. 



RECOMMENDATIONS 



A summary of recommended depth ratings and end-closure thicknesses, 

 based on the available experimental data and experience of the authors is given 

 in Table 6 for various diameters and lengths of Pyrex glass pipe with flanged 

 ends. 



46 



