Installation. The entire mooring complex was placed on the deck of 

 a floating crane in position for laying (Figure 6). The two ground cables 

 connected to the control head in each sinker block were coiled and tucked 

 inside the groove in the block (Figure 7) to protect them from damage during 

 laying operations. A 75-foot length of similar cable was welded to the second 

 A-link from the ground ring, and a 50Toot length of cable was welded to the 

 second A-link from the anchor of each ground leg. These cables were also 

 coiled tightly and tied in place prior to laying operations. A tight mooring 

 was carefully placed in its assigned location in the San Diego Bay. 



Three days after the mooring had been layed, the cathodic protection 

 units on the ground legs were connected for service. Two of the four sinker 

 blocks were found by divers to be lying on the side containing the unit. The 

 blocks were righted, and the ground cables on each unit were uncoiled and 

 connected as follows. The free end of the cable from the control head and 

 the free end of the cable attached near the ground ring were brought to the 

 surface. The lugs on each end were joined with a nut and bolt and were 

 silver-soldered together to insure electrical continuity. The joined cables 

 were then allowed to sink to the bottom of the bay. The second cable on 

 the control head and the cable attached near the anchor were similarily joined 

 to give the electrical circuitry shown in Figure 1 . The riser-chain was then 

 shortened to 23 feet so that the ground ring just touched bottom at mean 

 lower low water in this 38-foot-depth location. 



Another Mark 1 1 peg-top riser-chain buoy was coated with the phenolic 

 mastic system used on the cathodically protected buoy to serve as a control for 

 the latter. A foot-square area was sandblasted to white metal on the cone of 

 this buoy for comparison with the similar area on the cathodically protected 

 buoy. The riser-chain and two of the three ground legs were coated with cold- 

 applied coal tar coating Ml L-C-18480A; the third leg was allowed to remain 

 bare. The control mooring was then placed in an area of the San Diego Bay 

 adjacent to that of the cathodically protected mooring. Both the cathodically 

 protected mooring and the control mooring received relatively light service 

 from ships during the period of in-service testing described in this report. 



Performance. Immediately after laying, the potential of the 

 cathodically protected buoy was -850 mv.* No potential reading was 

 made immediately after connecting the cables on the ground legs and short- 

 ening the riser-chain because darkness had long since fallen. Three weeks 

 later, when a potential profile was made of the mooring complex, the buoy 

 potential had fallen to -730 mv. 



All potentials reported are with respect to a silver/silver chloride reference half-cell. 



