A simple economic procedure applied to NGL (natural gas liquid) pipelines can help operators determine whether abnormalities detected during periodic magnetic-flux leakage pigging are large enough to shut the pipeline for repair or if operations can continue. An Argentine NGL plant in Neuquen separates rich components of gas and pumps them 600 miles through a pipeline to Bahia Blanca fractionating plant. Pipeline construction used low-carbon API-5L-X65 steel, electric resistance welding, and an external three-layer extruded polyethylene coating to prevent external damage. In September 2004, after 4 years of uninterrupted operation, the operator used a magnetic-flux leakage intelligent pig to conduct internal inspection, fulfilling its maintenance plan. The final report showed some internal defects, only one of which was of major interest, having a 44 % thickness reduction and rectangular shape. Pipeline failure would likely result in a stoppage of production or safety incidents, such as fire, explosion, environmental pollution, injury, or death. Identifying and recognizing defects and failures in hydrocarbon pipelines is important and necessary. This first of two articles uses a simple economic procedure to help operators, engineers, and general managers make the right decision should a leak be detected, based on its behavior under different scenarios.
Integrity management - 1. Argentine NGL case study applies economic procedure
Oil and Gas Journal ; 106 , 22 ; 80-85
2008
5 Seiten, 6 Bilder, 2 Tabellen, 4 Quellen
Article (Journal)
English
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