Field Services

Field Services

CP systems all in accordance with NZ and AS specifications.

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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.

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.

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.

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.

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.

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.

Exothermic Welding (CAD Welding)

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

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.