What is Pipeline Pigging?

What is Pipeline Pigging I’m hearing you ask?

Pipeline pigging refers to the inspection of pipelines using a variety of in-line inspection tools to verify the integrity of the pipeline.

To ensure that our pipeline network is suitable for its intended purpose, internal inspections are conducted using a range of specialised tools in accordance with industry standards. In the scope of gas transmission, these inspections typically occur up to every 15-years.

How does Pipeline Pigging Work?

The initial step in this process involves utilising a gauge tool. This tool is primarily employed to ensure the circular shape of the pipeline and to guarantee that all valves are fully open. It consists of a short inspection device which carries an aluminium plate between the cups. If any damage to the pipeline, such as a reduction in bore size or partially open valves, is detected, the plate will become bent or damaged. In such cases, it's necessary to locate and address the source of the damage and the running of another gauge tool, before proceeding with further inspections.

Following the gauge tool, the next in-line inspection (ILI) tool utilized is the cleaning tool. This tool, typically twice the length of the gauge tool and flexible in design, features brushes to clean the pipe wall and magnets to collect any metallic debris within the pipeline, such as swarf from previous drilling operations. The cleaning tool can be run multiple times as needed.

The final step involves the inspection tool, which generates a magnetic field around the pipe to measure the thickness of the pipeline wall. This process identifies any reduction in wall thickness caused by corrosion or pipeline strikes. Depending on the extent of wall thickness reduction, appropriate measures are taken to address the defect.

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