EmiratesGreen Electrical & Mechanical Trading 
Abu Dhabi 

Oil & Gas, Petrochemicals, Power Plants and other Industries Process Equipment & Materials, Piping & Valves, Measurement Tools & Devices & others  

Corrosion Inspection of Pipelines

Corrosion Inspection of Pipelines:

Corrosion Problems of Pipelines? Earth burried pipelines are normally expensive investments. In order to protect pipelines against the threat of corrosion they are protected by coatings and coverings. However, the smallest damage of the coating or any cracks in pipeline coating / covering progressively and steadily lead to the feared pitting corrosion. Corrosion causes an electrochemical reaction which leads to loss of metal. As a result pipelines become leaky and can cause enormous damage to property and environment.

Therefore it is one of the important tasks of opewer or a public utility company to protect its assets for a prolonged period of time, to extend the lifespan of the pipeline network and to minimize any repair works.

Why Corrosion Inspection & Monitoring

  • Improved safety
  • Reduced environmental impact
  • Lower operating costs
    • Reduces maintenance/inspection costs
    • Minimises unscheduled shutdowns
  • Optimised process efficiency
    • Inhibitor injection rates
    • Oxygen concentrations
    • Flow rates
  • Assessment of effect of operational changes/upsets

Corrosion Inspection of Pipelines – CIPs & DCVG:

The corrosion inspection of Pipelines typical applications CIPS and DCVG inspection techniques to:

  • evaluate Pipeline’s coating & define rehabilitation scope / requirements
  • gather on-and-off potential data along the pipeline
  • analyze the protection level, specially related to the potential value at the defects in pipeline coating
  • locate insulation flaws / defects
  • investigate & identify stray current
  • identify the flaws and weaknesses in the Cathodic Protection system
  • find short-circuited casing, etc.
  • categorize defects / flaws
  • propose the necessary plan of actions for rectification in  Cathodic Protection System

CIPS and DCVG - Simultaneous methods for Pipeline Corrosion Inspection Monitoring

Simultaneous use of the CIPS and DCVG methods has several advantages over other diagnostical solutions & methods:

  • each insulation flaw belongs to structure/corrosion potential value
  • the measured (real) values serve the basis for calculation of the coating or insulation flaws/defects
  • the potential measurement takes place exactly above the pipeline
  • the measurement needs only one team performing one survey

Survey equipment required for carrying out Cathodic Protection Systems and Pipelines corrosion surveys typically comprises the following:

  • Synchronised Current Interrupter
  • Datalogger with battery chargers– one mobile, one static
  • Interface power unit with battery charger - one mobile, one static
  • Interface cables to connect Datalogger to Interface unit
  • Cu/CuSO4 half cell static
  • Cu/CuSO4 half cell fitted to poles
  • BACPAC comprising mounting frame for wire dispenser, distance measurer, Datalogger and Interface unit together with harness.
  • No Survey wire reels each comprising approx. 2 Km re-usable fine stranded PVC insulated stainless steel wire – minimum of two reels required.
  • Wire re-winder for the recovery of the wire
  • Connecting cables
  • Survey Spares

The implementing via integrity programs in order to ensure that leaks and failures not to occur in pipelines. The corrosion inspection surveys of pipelines significantly minimizes the risk of failures and also increasing / extending the useful life of pipeline assets.

Corrosion inspection program for pipelines also helps to identify and allows repairing problems at an early stage in their development, as the small leaks in pipeline can at the end lead to failures and will reduce the risk of pipe failure.