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EEPORTDOCUMENT TIONP GE FormApprovedOU BN o.704 018Pubicreportingbuidan forth collection of informationis est imatedtoaverage1 hour pe r response,includingthetiriie for ieviev*nginstructions,searehirflexistingdatasources, gathering an dmaintainingth e data needed,an dcompleting an dreviewing th e cosection of information.Sendcommentregardingthisburden e st ima t eor an yothera spe ctof this collectioninformation, includingsuggestions fo r reducingthis burden,toWashington Headquarters Services.Directorate forlnformation an dReports.1215JeffersonDavis Highway.Suite1204.Arlington,VA22202-4302.aridtotheOfficeofM aragem ent an dft idget .Paperwork Reduction Project(07O4-O188).Washington.DC20S03.

1. AGE NCYUS EONLYLeaveblank 2. RE PORT DATEFebruary9944. TITLE AN D SUBTITLE

THODI PROTE TIONSYSTEMINSPE TIONVI6. AUTHOR S)

Jim Jenkins7. PERFORMING ORGANIZATION NAMEISI AND ADDRESSEIS)NavalFacilitiesEngineering Service CenterPortHueneme,CA93043-4328

9.SPONSORING/MONITORING AGENCY NAV 3 N ADDRESSES

> 11. SUPPLEMENTARY N O T E S

3. RE PORT TYPE AND DATES COVERED

5. FUNDING NUMBERS

8. PERFORMING ORGANIZATION R E P O R TNUMBERTDS-2003-SHR

10 . SPONSORING/MONITORING AGENCY R E P O RNUMBER

^f i12a. DISTRIBUTION/AVAILABILITY STATEMENT

Approvedfo rpublicrelease;distributionsunlimited. 12b. DISTRIBUTION CODE13 . AB S TRACT Maximum2 wordsIf th ecathodic protectionsystemis periodically inspected andmaintainedto providecontinuousprotection,theconditionofth eprotectedstructureca nbeinferred fromth ecathodic protectionsystemrecords withoutth eneed fo rphysicalinspection oftheprotected structure.

1 9 9 5 1 1 2 9 SSSQIJustificationBy..._Distribution /

AvailabilityodeDist Availnd/orSpecial

14. SUBJECTE R M SCathodicprotectionsystem rectifiers,inspectionV I17 . SECURITY CLASSIFICATIONOF REPORT

Unclassified1aSECURITY CLASSIFICATIONO F THIS PAGE

Unclassified19 .SECURITY CLASSIFICATIONOF ABSTRACT

Unclassified

15. NUMB E R OFAGE16. PRICE CODE20.LIMITATION OFABSTRACT

ULNS N754001-280-5500 Standard Form 298(flev.2-8Prescribedby ANSIStd.239-

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Tech data2003 SH R February1994

NAVALACILITIESNGINEERINGERVICEENTER ORTUENEME A93043-4328CATHODIC PROTECTION SYSTEM

INSPECTIONVIW hen a cathodicprotection system iswork-in gproperly corrosionofth e rotectedtruc-tureisvirtually nil.H oweve r ,when th ecathodicprotectionystemisotworkingproperly,hecorrosionofth estructureproceeds tarateuptohe o rma lorrosionrateofanunprotecteds tructure.fheathodic rotectionystemsperiodicallyinspected and maintained to providecont inuousprotection,heconditionofth epro-tectedtructurean enferredromhea-thodic protection system recordswithout theneedfo r hysicalnspectionofth e rotectedtruc-ture.Thus th ehighcostofinspectingburiedorsubmergedtructureurfacesanbevoidedfth eathodic rotectionystems roperlyn-spectedand maintained.Theequirementsorcheduledinspectionof cathodicprotection systemsare givenin Chapter8ofN ava lFacilitiesEngineering CommandM O -306 Maintenance andOperation of CathodicPro-tectionSys tems . Eachindividualcathodicpro-tectionsystem shouldbeinspectedaccordingtotheserequirements .Therequirementsare:

Monthly:nspectrectifiers.

Quarterly:Measuretructureo lectrolyte o-

tentials.Annual ly :

nspectsubmerged anodes(waterf rontstructuresand watertanks)forconsumption.nspectesttationsormechanicaldamage.

INSPE TIONPRO EDURES The roceduresormonthlynspect ionofcathodic rotectionystemectifiersere e-scribedin N F E S C TechdataSheet(TDS)(2002-SHR)ndaredescribedin moredetailnM O -

306.A sinallinspectionprograms ,properrec-ord keepingisvital.N A V F A C Form 11014-74Bshould e sedoecordheesultsfhesemonthly rectifierinspections.Thestructuretoelectrolytepotentialisth ekeymeasurementndeterrniningproperopera-tionofcathodicprotectionsystems.Proceduresfo r erforminghesemeasurementsere ut-

Approvedforpublicrelease;istributionisunlimited.

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linedinN C E L TDS 3-04ndaredescribedinmore etailnM O - 306 .or uriedtructures,structure-to-electrolytepotentialsshould betakenataminimumoffourpointswithintheystemwithoneofthesepointsbeingth eleastnegativepointmeasurednpreviousurveys.Assistanceinestablishingthesetestpointsanbeobtainedfromheorrosionontroloordinator tourgeographicalEngineeringFieldDivisionorA c-tivity,from th eCathodicProtectionSystemCen-te rofExpert ise,rromheNava lFacilitiesEngineeringerviceenter.hetructureoelectrolytepotentialreadingsshould berecordedon N A V F A C Form110 14 -74A .

Forwaterfronts tructures ,hetructure-to-electrolyteotentialhouldls oeeasuredquarterly t minimumofourointsnhesystem.Thesemeasurementsshould berecordedonN A V F A C Form 0 0 14 -74A .

Forwatertankswithinternalcathodicpro-tectionystems,heystem suallyncludespermanent referenceelectrode in thetank.Thestructure-to-electrolyte potentialshould bemeas-uredmonthlyduringth einspectionofth erecti-fierusingthe permanent reference electrodeandrecordedonN A V F A CForm1014-74B.heperformanceofthepermanent referenceelec-t rodean eheckedyomparingtwithportablereferenceelectrode ofknown accuracy.Thiss sually erfo rmednonjunctionwithth ennualnspectionofth eankanodesse-scribed below.

Submerged anodesonwaterfrontstructuresandwateranksre visuallynspectedoron-sumption.fth eanodeisuspended,tcanusu-allybe retrievedfo rinspection.nthiscase,heeasies tw ayofdeterminingnodeonsumptioninostnstancessoeighhenodend

compareheeightithheriginalnodeweightandth eweightmeasuresduringpreviousinspections.ftheremainingweightofth en-odeislessthan thatrequiredfo ranotheryearofoperation,tshouldbereplaced.Whenth en-odesremounted irectlyohetructure,rcannotberetrieved fo rtopsideinspection, iverscanbeusedtoinspectth eanodesfo rconsump-tion.nthisase,he divershouldmeasureth eanode(length,widthand thickness)to determineanode consumption.

The inspection ofteststationsisprimarilyavisualnspectionor rokenwires ,ooseon-tacts,ndorrosionofonductorsoronnec-tors.

Indditionoheminimumequirementsdescribedabove,tisgoodpracticetoperformadditionalinspections.Wheneveraburiedstruc-turesxcavatedorepair rnonjunctionwith therwork ,heurfaceofhetructureshould enspectedorvidenceofcorrosionand,foated,oroating eterioration.fwateranksmptiedoranyreason,hente-riorhouldikewise enspectedorvidenceofcorrosion orcoatingdeterioration.Goodecord eepingsheeyonyinspectionndmaintenance rogram.nddi-tiontoth erequiredrecordsForms 1014 - 7 4Aand1014-74B) ,ecordsofleaksndequiredmaintenance nhe uried rubmergedys-tems,sellsepairsndmaintenancee-quiredonthecathodicprotectionsystem shouldbemaintained.Currentdrawingsofundergroundutilitysystems,waterfrontstructures,ndwatertanks,swellsurrent rawingsfhea-thodic protectionsystemsare alsovitalto a goodoverallinspection andmaintenance program.

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NFES ONT TS M r.Jim Jenkins,CodeESC63(WaterfrontMaterialsDivision)Comm: (805)982-4797 ,D S N :51 - 47 97F AX:8 0 5 )98 2 -98 5 -1197orM r.PeteTafoya,CodeESC101CommandSuppor t& TechnologyOffice)Comm: (805)982-1342 ,D S N :51 - 1342

orAnsweringMachineComm: (805)982-4070 ;D S N :51 - 407 0

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DEPARTMENTO FTH NAVYCOMMANDINGFFICERNFESC 560ENTERRIVEPORTUENEMEA3043-4328OFFICIALBUSINESSNFESC110/1 10/93)