TABLE 1 



CURl^NT DENSITIES REQUIRED FOR CATIIODIC PROTECTION 

 OF PILING AT HARBOR ISLAND 19^0-51 



Type of Pile 

 H Beam 

 Tubular 

 I Beam 



Tubular 

 H Beam 

 H Beam 

 K Beam 1 

 H Beam ^ 

 H Beam 



Tubular -^ 



Tubular ^ 



H Beam 



Type of Coating 



None 



None 



Coal Tar Enamel 

 Above Low Tide 



Coal Tar Enamel 



Coal Tar Enamel 



Vinyl System 



Tnemec 



Insulmastic 



JJonel Sheathing 

 Above Lov; Tide 



ivione 1 She at h ing 

 Above LoviT Tide 



Nickel Sheathing 

 Above LoviT Tide 



70:30 Cu Mi Above 

 Lavi Tide 



Current Required to Polarize-x- to 

 800 to 8^0 ilillivolts vs. Calomel 

 Half Cell - Ma. Per Sq. Ft, 



After 2 ilonths After 11 Months 



1,6 to 2.U 1.2 to 1.8 



5.9 3.3 



2.0 to 2.8 

 0,02 to O.Oii 



0.17 

 0.15 to 0.33 



0,Ux 



0,26 



1.6 to 2.1 

 2,6 to 2.7 

 0.7 



0.07 



1.2 to 3. It 

 0.06 to 0,18 



0.13 

 0.33 to 1.1 



1.8 



0.31 



1.6 to 1,7 



0.8 to 1.5 



l.Il 



1.0 



-»-A].l piling polarized initially at hO ma. /sq.ft. for 2 months 

 -'-Piles in area vfhere sea v/ater is under constant agitation. 



E - 6 



