Table 12. Potential Profile of Mooring With Specialized Zinc Anodes 

 and Four Cables 9 Months After Relocation 



Reading 

 No." 





Potential (mv) on 



- 





Riser-Chain 



Legl 



Leg 2 



Legs 



Leg 4 



1 



-940^ 



-890^ 



-890' 



-890' 



-890' 



2 



-920 



-890 



-890 



-890 



-890 



3 



-920 



-985'^ 



-990'^ 



-980'' 



-990'' 



4 



-97 0*^ 



-930 



-920 



-930 



-920 



5 



-890'' 



-930 



-910 



-920 



-920 



6 



- 



-925 



-915 



-930 



-920 



7 



- 



-920 



-910 



-930 



-930 



8 



- 



-920 



-910 



-935 



-930 



9 



- 



-930 



-910 



-935 



-935 



10 



- 



-985'' 



-970'^ 



-980'' 



-955 



11 



- 



-930 



-910 



-940 



-935 



12 



- 



-920 



-880 



-940 



-935 



13 



- 



-915 



-875 



-940 



-920 



14 



- 



-915 



-875 



-935 



-930 



15 



- 



-915 



-885 



-920 



-930 



16 



- 



-915 



-885 



-940 



-940 



17 



- 



-990'^ 



-970'' 



-1 ,020'' 



-1,000'' 



18 



- 



-910 



-885 



-945 



-930 



19 



- 



-910 



-970 



-940 



-930 



20 



- 



-900 



-870 



-940 



-930 



21 





-870^ 



-720^ 



-665^ 



-645'^ 



Readings taken approximately every 10 to 20 feet. 

 ' At buoy. 

 At ground ring. 



At link on which anode was cast. 

 At anchor. 



Twenty-two months after relocation of the cathodically protected 

 mooring, another potential profile was taken. This is shown in Table 14. 

 Again, all readings were above the desired minimum level (-850 mv), and 

 also all readings on the chain were above -900 mv. Three of the four anchors 

 were also receiving appreciable cathodic protection at this time. 



33 



