bending moments at the terminations, a modified Hooke's Joint 

 coupling is used between the clevis fittings. A hole is drilled 

 through the center of each coupling for attachment of stopper 

 hardware. A photograph of a typical wire rope connection is 

 given in Figure 3-11. Various length shots were used to fit the 

 deployment procedure and to accommodate errors in depth and 

 mooring location. 



3.1.8 Inner Mooring Cable (Vector Cable Co., Dwg.B-3695) 



The inner mooring cable is also a polyethylene-jacketed torque- 

 balanced wire rope. It is laid up using 58 galvanized high strength 

 steel wires in four layers around a .045" core wire. The first 

 three layers are right lay, with six .040", twelve .040", and fifteen 

 .049" wires. The outer layer is left hand lay, with twenty-four 

 . 039" wires. The wire rope diameter is . 380". The . 050" wall 

 polyethylene builds up the outside diameter to .480". Cable weights 

 per 1000 feet are 297 lbs. iil air and 217 lbs. in water. Ultimate 

 strength is 16, 000 lbs. Cable stretch was measured to be 0. 59 feet 

 per 1000 feet per 1000 lbs. tension. 



The underlying reasons for selecting this rope are the same as 

 those mentioned above for the outer mooring cable. Rope termin- 

 ations and couplings are of the same type used on the outer mooring 

 cables, (clevis fittings: ACCO P/N MS-20667-12, eye fittings: 

 MACWHYTE P/N RA 152-12. 



3.1.9 Cable Floatation 



The development of a suitable cable floatation scheme has been 

 a difficult task, primarily because of schedule and funds limitations. 



Approximately 8000 lbs. of net buoyancy is required. The price 

 for reliable glass spheres was about $3. 00 per lb, plus hardware to 

 capture the spheres. Glass buoyancy would therefore have cost in 

 excess of $30, 000. More exotic techniques (using syntactic foam, 

 for example) were not only too expensive but were also ruled out 

 for the pilot project because of the tight schedule. Since the available 

 glass spheres are so expensive and apparently over-strengthed for 

 our application, we were prompted to search the market for a more 

 suitable float. Only two commercially available designs having 

 adequate specifications were found: A cast aluminum alloy sphere 



208 



