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Hemi-10, 10 cm2 Steel Coupons 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 measurements include: 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 Hemi-10 Coupon A new design, the "Hemi-10" steel C.P. coupon is a 10 cm2 half-round coupon designed for maximum contact to earth, which is critically important for AC current density measurements. The 10 cm² coupon allows better contact to native earth as compared to the smaller 1 cm² coupons. For AC current density measurements, the 10 cm² surface area allows a direct conversion from mA to A/m² without having to use any mathematical conversions.The coupon is mounted inside a durable PVC housing and the Hemi-10 is provided with a single or dual 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 measurements include: 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 Hemi-10 Coupon A new design, the "Hemi-10" steel C.P. coupon is a 10 cm2 half-round coupon designed for maximum contact to earth, which is critically important for AC current density measurements. The 10 cm² coupon allows better contact to native earth as compared to the smaller 1 cm² coupons. For AC current density measurements, the 10 cm² surface area allows a direct conversion from mA to A/m² without having to use any mathematical conversions.The coupon is mounted inside a durable PVC housing and the Hemi-10 is provided with a single or dual length of #12 AWG stranded copper cable with RHH/RHW direct burial insulation, typically green in color.Coupon Ordering Information Specify the Hemi-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.                     Hemi 10 Single Cable Lead  Hemi 10 Dual Cable Lead 
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