Abstracts Book - IMRC 2018

• SE2-P002
FRACTURE FAILURE ASSESSMENT IN API 5L X70 PIPELINE STEELS
Jhonny Ortiz 1
1 Universidad Nacional de Trujillo, Mechanical engineering, Peru.
Structural integrity assessment in hydrocarbon transportation systems has
become critical especially in very old pipes and due to the diverse geography of
Peru, which produces unexpected load conditions. In many situations, the flaws
that cause structural failure are cracks, which can be located and sized by
modern inspection methods. However, we need to know how they respond to
the various operating conditions. In this work, it is used the failure assessment
diagrams (FAD) method presented in the API 579 procedure, for crack behavior
assessment in hydrocarbon transportation pipes API 5L X70. The investigation
is developed in conjunction with finite element simulation techniques for
fracture parameters calculation. Models of increasing complexity are developed
for determining appropriate mesh characteristics and the results are validated
with the solutions given by API 579. Validated models are applied to the case of
severity assessment of outer semi-elliptical surface cracks in hydrocarbon gas
pipelines, proving its utility in making decisions regarding safe operating
conditions.
Acknowledgment:
The authors would like to acknowledge the financial support National University
of Trujillo. Peru. Project Cannon PIC06-2013 “Estudio fractomecánico de daño
en poliductos de minería y petróleo con riesgo de contaminación
medioambiental”.
Keywords: Structural integrity, crack, finite elements
Presenting authors email: jeortiztavara@gmail.com