Field Services

Soil resistivity testing

This provides the necessary data required to design CP systems for your asset.

• Determines the ideal location for an anode bed.

• Gives an indication of the corrosiveness of the soil or water in which the structure is located.

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Current Mapping

CPNZ use the Latest Radio Detection PCM-X current mapper, allowing us to:

• Efficiently identify CP current flowing from one pipe to another.

• Identify if CP current is flowing to electrical earth.

• Identify electrical shorts to another structure, i.e. a motorway support.

• Identify faulty isolation joints.

• Identify high resistant joints, i.e., valves.

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DCVG Surveys

Conducting extensive DCVG Surveys allows CPNZ to:

• Locate coating defects.

• To identify third party strikes damaging the coating or worse.

• Perform a final QA check on new Pipelines to prove the coating is defect free.

• To monitor coating breakdown by conducting routine coating condition surveys.

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Isolation Testing

CPNZ uses swain clamps (4" and 14") to carry out Isolation Testing. Isolation points greater that 14” can be testing using the Current mapper.

• Prove or disprove isolation.

• To track current flow through bonds., Changes in current flow are a good indication of where there maybe a problem.

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Cathodic Protection Monitoring

CPNZ uses a MC Millar multimeter, which is designed explicitly for CP potential readings. This has the ability to change the impedance and prove that the Potential reading is accurate.

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Close Interval Potential Survey (CIPS)

CPNZ conducts CIPS to:

• Identify dips in the protection levels.

• Prove (or disprove) that all areas of the system are fully protected.

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Exothermic Welding (CAD Welding)

CPNZ conducts CIPS to enable long-term low resistance cable connections to structures.

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Data Logging

• To ensure protection is constant 24/7.

• To be used in areas of Traction or Telluric’s to prove that the CP criteria has been met.

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