The ultramodern method named “pigging” is an ecological pipeline cleaning method
Today the “pigging” pipeline cleaning method is a generally accepted technology and many operators use it when there is no other cleaning solution and a big investment is subject to risk. The proper application of the “pigging” method will help maintain the integrity of the pipeline.
Being an ecological method, “pigging” helps to ensure removal of any substances that could damage the pipe, prevents the forming of corrosion cells, provides timely information on any deficiencies of the pipeline, and provides data on issues arising in the pipeline structure in order to take a correct decision regarding the rehabilitation of the respective pipeline. It provides an alternative to close the pipeline for a period of time to be able to perform the periodical tests, removal of waste residues or foreign bodies from the inside of the pipeline, removal of solid and liquid deposits that can form on the inner walls of the pipeline and can restrict the flow.
The “pigging” instrument is a tool used for ultrasonic inspections for a comprehensive survey of the walls of oil or petrol products transportation pipelines. The instrument travels through the pipeline being geared by the flow of the oil product, and while being inside it measures and records the thickness of the pipeline’s walls and the distance to the inner wall’s surface. The purpose of these measurements is to provide information to the operator through a detailed inspection protocol in which all pipeline defects and anomalies are precisely documented, especially the metal loss from the pipeline’s inner walls due to corrosion, and the geometrical deformation of the pipeline’s inner walls. The report also includes a set of pipeline rehabilitation suggestions based on computing power.
The “pigging” instrument can detect the following defects and current condition characteristics of the pipeline: metal losses from the interior or exterior of the pipe, lamination, lamination in slope, circumference of the welds, longitudinal welds, lamination bound up by HIC, blisters, wall thickness variations, geometrical deformations of the pipeline, pipeline installations.
In brief, this technology helps to find proper determination of the pipeline’s construction and helps maintain its original shape. However it should be noted that both efficiency and prospecting the pipeline, depends on the “pigging system” and by the efficiency of the “pigs” used for the procedure.