Unci assi f led 



DOCUMENT CONTROL DATA R&D 



Naval Civil Engineering Laboratory 

 Port Hueneme, California 93043 



Una I ass i f ied 



ANALYSIS OF THE CONDITION OF ECHO TOWER, AZORES FIXED ACOUSTIC RANGE, 

 AFTER ONE YEAR AT 1500 FEET OF DEPTH 



TE5 (Type of report end Ineluelv 



Fi nal 



1 AUTHORISI (FIrel naina, ijiiddle Initial, Imet ntme) 



James F. Jenkins 



May 1973 



22 



52-021 



TN-1284 



9b. OTHER REPORT NOIS) (Any Other numbarm thmt mmy be mmalgnvd 



Approved for public release; distribution unlimited, 



Naval Underwater Systems Center 

 New London, CT 06320 



The condition of ECHO tower after a one year exposure to seawater 

 at a depth of 1500 feet was analyzed immediately after removal, after 

 five days exposure near the surface and after removal from the sea. 

 The only areas of critical corrosion were several pits found on the 

 antennas. These pits were recoated but failure of the repair coat- 

 ings could result in tube penetration in as little as one year of 

 additional exposure. Recommendations for modification of existing 

 towers to increase their useful life, as well as that of future 

 designs, are given. 



DD ,?r.,1473 "'^'^^ " 



S/N 010 1-807-6801 



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