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99523 USING ILI PIGS TO ESTABLISH PIPELINE CORROSION RATES - CASE HISTORIES

Picture for 99523 USING ILI PIGS TO ESTABLISH PIPELINE
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Product Number: 51300-99523-SG
ISBN: 99523 1999 CP
Author: William H. Brown
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Corrosion is a major concern for the oil and gas industry. Pipelines are subject to internal and external agents that can cause corrosion affecting their safety, integrity, and profitability. Corrosion causes metal losses that may hamper the supply of energy and could lead to substantial damage to the ecology. Restoring pipelines to safe operating condition is the main goal of in-line inspection (ILI) using state-of-the-art Smart Pigs. These tools travel through the full length of pipelines gathering detailed information that is used for the assessment of both the internal and the external surfaces of the line. Ultrasound lLI tools perform direct measurements of the remaining wall thickness of the pipe. The analysis of an ultrasound ILI run determines the residual strength of the pipeline at the time of the inspection. On the other hand, the comparison of successive ultrasound runs establishes patterns of individual defect growth. Under this light the interpretation of the data leads to an assessment of the dynamics of the corrosion phenomena occurring in pipelines. Case histories are presented in this paper in order to illustrate how ultrasound ILI data are being used today to establish courses of action in corrective, preventive, and predictive maintenance of pipelines. Key words: pipeline, smart pig, in-line inspection (ILI), ultrasound wall-thickness test, metal loss, corrosion, integrity, maintenance.
Corrosion is a major concern for the oil and gas industry. Pipelines are subject to internal and external agents that can cause corrosion affecting their safety, integrity, and profitability. Corrosion causes metal losses that may hamper the supply of energy and could lead to substantial damage to the ecology. Restoring pipelines to safe operating condition is the main goal of in-line inspection (ILI) using state-of-the-art Smart Pigs. These tools travel through the full length of pipelines gathering detailed information that is used for the assessment of both the internal and the external surfaces of the line. Ultrasound lLI tools perform direct measurements of the remaining wall thickness of the pipe. The analysis of an ultrasound ILI run determines the residual strength of the pipeline at the time of the inspection. On the other hand, the comparison of successive ultrasound runs establishes patterns of individual defect growth. Under this light the interpretation of the data leads to an assessment of the dynamics of the corrosion phenomena occurring in pipelines. Case histories are presented in this paper in order to illustrate how ultrasound ILI data are being used today to establish courses of action in corrective, preventive, and predictive maintenance of pipelines. Key words: pipeline, smart pig, in-line inspection (ILI), ultrasound wall-thickness test, metal loss, corrosion, integrity, maintenance.
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