Structural Integrity of Pipelines

  • Aníbal C. Di LuchEmail author
  • Nicolás Oyarzábal
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The acceptance standards given in API 1104 Section 9 are based on empirical criteria for workmanship and place primary importance on imperfection length. Such criteria have provided an excellent record of reliability in pipelines service for many years. Alternative acceptance standards for girth welds are presented in Annex A. The use of fracture mechanics analysis and fitness for service criteria for determining acceptance criteria incorporates the evaluation of both imperfection height and imperfection length. This criteria usually provide more generous allowable imperfection length. This approach is applied to a new gas pipeline, API 5L X70 material, 24 inches diameter and 11.9 mm thickness. The applied methodology is presented to perform failure assessment diagram (FAD) and a sensitivity analysis and safety margins or factors are determined.


Pipelines Integrity Welding Failure 


  1. 1.
    American Petroleum Institute. (2013). API Standard 1104. Welding of Pipelines and Related Facilities.Google Scholar
  2. 2.
    The British Standards Institution. (2015). BS 7910:2013 + A1. Guide to methods for assessing the acceptability of flaws in metallic structures.Google Scholar
  3. 3.
    International Standard. (2010). ISO 15653. Method of test for the determination of quasistatic fracture toughness of welds.Google Scholar
  4. 4.
    International Standard. (2002). ISO 12135. Unified method of test for the determination of quasistatic fracture toughness.Google Scholar

Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  1. 1.Welding DepartmentCNEABuenos AiresArgentina
  2. 2.Material Testing LaboratoryITBABuenos AiresArgentina

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