Transmission And Substation Foundations - Technical Design Manual (TD06088E)

Sensor Pin Installation Figure A-10

Nillson Resistivity Meter Figure A-11

E. Documentation Record the field data and the calculations onto the soil resistivity log. A sample log is presented be- low (See Figure A-12). F. Evaluate Results When the Soil Resistivity (R) has been determined, refer to Figure A-5 to determine an estimate of the loss of weight by corrosion over a 10-year period for underground bare steel structures.

CORROSION

COMBINED WENNER 4-PIN SOIL RESISTIVITY LOG

Location:

Job No.

Date:

Weather Conditions:

Orientation of Pins:

WENNER METHOD OF SOIL RESISTIVITY

PIN SPACING (Depth in Feet)

METER RESISTANCE (R Meter ) (ohms)

METER MULTIPLIER (M)

WENNER SPACING FAC- TOR (WSF) (191.5* x Pin Spacing)

SOIL RESISTIVITY R = (R Meter ) x M x WSF

* If pin spacing is measured in meters, useWENNER SPACING FACTOR (WSF) of 628 instead of 191.5 Sample Resistivity Log Figure A-12

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