Collect data.

ETL 1110-9-10(FR)
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ETL 1110-9-10(FR)

5 Jan 91

Collect data.

Design requirements should be established, and certain

assumptions will be made.

History

Information from occupants in the area can indicate

the severity of corrosion problems. Data on failures

and failure rates of nearby structures can be invalu-

able and must be considered.

Drawings

Drawings of the structure to be protected and the

area where it is or will be installed are needed to

provide the physical dimensions of the structure for

determining surface area to be protected, and

locations of other structures in the area that may

cause interference, of insulating devices, and of

power sources. Information on coatings should be

obtained.

Tests

Current requirement test and potential survey test

results are needed for existing structures that will

be protected. Electrolyte (soil or water) resistivi-

ty tests and evaluation of conditions that could

support sulfate-reducing bacteria are needed for all

cathodic protection designs. This information will

indicate the size of the cathodic protection system

that will be required as well as the probability of

stray current problems. Soil resistivities contrib-

ute to both design calculations and location of the

anode groundbed.

Life

The user must determine the required number of years

that the structure needs to be protected, or the

designer must assume a nominal life span. The struc-

ture will begin to deteriorate from corrosion at the

end of the cathodic protection system's design life

unless the system is rejuvenated.