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Hemi 100, 100 cm2 Steel Spherical Coupon 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-100 Coupon Details The "Hemi-100" steel C.P. coupon is a 100 cm2 spherical coupon design to improve contact with earth.  The larger, sperical shape helps with soil contact upon burial.   The coupon is mounted on a durable PVC housing and the Hemi-100 is provided with a 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-100 Coupon Details The "Hemi-100" steel C.P. coupon is a 100 cm2 spherical coupon design to improve contact with earth.  The larger, sperical shape helps with soil contact upon burial.   The coupon is mounted on a durable PVC housing and the Hemi-100 is provided with a dual length of #12 AWG stranded copper cable with RHH/RHW direct burial insulation, typically green in color.    Hemi-100 Coupon Ordering Information Specify the Hemi-100 steel coupon Choose a cable length of 25, 50, 75 or 100 feet (Note that a dual cable is standard on the coupon) Select a cable insulation color (green is the Farwest standard) such as white, blue, orange, etc.
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