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

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.

Created by: Pipeline Corrosion Control

Last updated 11/2025

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Description

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.
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