conservative testing policy toward them. The special fittings 

 are less suspect. 



In preparation for the November 1967 installation, all standard 

 hardware components were proof tested at the Bermuda Naval 

 Operating Base. A crane and large dead weights such as Navy 

 Anchors were used to static load the test articles. In some 

 instances the articles failed well below advertised yield. Some 

 photographs are given in Figs. 4-5 and 4-6. Table 4-4 

 summarizes the results obtained. The Bridle for Station 1 

 was proof loaded to 15, 000 lbs. at MIT before shipment. In 

 addition all carbon steel shackles were radiographed and magnetic - 

 particle inspected with the result that 3% were rejected because 

 of internal cracks. All stainless steel shackles and a sample 

 of stainless steel couplings were radiographed and dye-penetrant 

 inspected with the result that no flaws were found. 



In preparation for last October's operation, all standard 

 hardware components were proof tested at MIT. Table 4-6 

 summarizes the results obtained. Radiographic inspection was 

 performed on all steel shackles after proof loading. Stainless 

 steel fittings were radiograph and dye-penetrant inspected. 

 Twelve percent of the carbon steel shackles were rejected. Stain- 

 less steel fittings exhibited no flaws. Before proof testing, yield 

 point and ultimate tensile strength were obtained on samples. 

 Table 4-5 summarizes the yield and ultimate strength tests. 



4. 1. 4 Testing of Cable Floats 



As described in Section 3, our interest has been centered 

 on the Phillips XX and the Plasticos de Galicia Special Marola 

 200 floats. Neither float can be expected to survive five years 

 at the depth of the deepest outer mooring float, which is nominally 

 870 meters (1290 PSI) and ^A^iich increases to 1130 meters (1680 

 PSI) at the maximum current condition. However, the pilot 

 project has gone ahead with a modification of the original 

 design. The dense arrays of 228 Special Marolas used on each 

 outer mooring cable are expected to suffer a significant number 

 of casualties during the first year because they have been pulled 

 down to a depth in excess of 800 meters. Since they are slightly 

 buoyant after collapse, the Marolas will not weigh down the 

 system. These losses are compensated by the attachment of 

 about 125 extra XX floats on each outer mooring cable near the 

 Head Frame. 



Our float testing efforts have been directed to evaluate: 



a. time to failure as a function of pressure and 

 temperature 



b. corrosion characteristics 



c. leakage 



221 



