Flathead 10, 1 cm2 Steel Coupon for Cathodic Protection by Farwest Corrosion

An Industry Standard. Available with Single or Dual Test Lead Cables

Cathodic protection coupons are a simple, size-specific piece of metal with one or more wires attached and are used for evaluating corrosion control or cathodic protection systems protecting a structure, typically a steel pipeline.  These measurments includes:

  • Native or unprotected structure-to-soil potentials
  • Structure-to-soil potentials with the CP system energized
  • Structure-to-soil potentials with the CP system interrupted
  • To emulate an “Off” structure-to-soil potential without interrupting CP current, typically referred to as a “Coupon Interrupt” reading.
  • For magnitude measurements of AC current density on a structure with known induced AC issues.
  • Use as an isolated coupon to evaluate native or unprotected potentials.

Coupons are provided in a variety of size ranges depending on the application.  Currently, the two most popular sizes are 1 cm2 and 10 cm2.  In addition to the coupon size, there are different physical configurations as well.

Flathead-10 Coupon

The "Flathead-10" steel coupon is a 10 cm2 coupon made from 1018 alloy steel.  The steel coupon is flush mounted inside a durable PVC housing.  This coupon includes a specified length of #12 AWG stranded copper cable with RHH/RHW direct burial insulation, typically green in color.

Coupon Ordering Information

  • Specify the Flathead-10 steel coupon
  • Select the number of cable lead wires, 1 or 2, for the coupon
  • Choose a cable length of 25, 50, 75 or 100 feet.
  • Select a cable insulation color (green is the Farwest standard) such as white, blue, orange, etc.