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Improvement of Reliability Assessment of Gas Pipeline Using Acoustic Emission Technique

[+] Author Affiliations
Giuseppe Giunta, Luca Prandi

eni S.p.A.-Gas & Power Division, San Donato Milanese, Italy

Sergio Budano, Antonio Lucci, Roberto Piancaldini

Centro Sviluppo Materiali S.p.A., Roma, Italy

Paper No. PVP2013-97175, pp. V005T10A005; 8 pages
doi:10.1115/PVP2013-97175
From:
  • ASME 2013 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium
  • Paris, France, July 14–18, 2013
  • Conference Sponsors: Pressure Vessels and Piping Division, Nondestructive Evaluation Engineering Division
  • ISBN: 978-0-7918-5569-0
  • Copyright © 2013 by ASME

abstract

Among NDE techniques for monitoring damages on pipelines in service, the Acoustic Emission (AE) technique is effective to check initiation and propagation of critical defects under stress and exposed to aggressive environment. To investigate both reliability and applicability of the AE technique to pipelines used in Oil&Gas industry, different full scale tests have been designed and performed as significant items. A pilot line (48″ diameter and length 194m), formed from pipes made of both steels grade API 5L X80 and X100, has been buried and monitored for about 16 months by using AE technique. External defects (dent & gouge type) have been executed on each pipe. A pressure cycling test has been provided giving pressure in the range 135–150 bar for simulating gas transport operation over many years. By means of AE technique the source localization of defects and correlation between the damage growing and the acoustic transient energy have been analyzed. The growth in the crack areas has been also periodically controlled using NDT inspections (US and magnetic particles). The results provide good perspective for using AE technique as advanced methodology to improve the reliability of pipeline.

Copyright © 2013 by ASME

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