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LEARNINGS ABOUT GEOHAZARDS IN CENIT PIPELINE INTEGRITY MANAGEMENT

IPG2019-5344

Carlos Motta Tierradentro

BAYESIAN BELIEF NETWORK TO GEOHAZARD ASSESSMENT

GEOTECHNICAL

SUSCEPTIBILITY

TRIGGERING

AGENTS

ROW

INSPECTION

FINDINGSPIPELINE

VULNERABILITY

GEOTECHNICAL

HAZARD

ROW

HAZARD

PIPELINE

EXPOSURE

Geotechnical hazard = φ (Geotechnical susceptibility, Triggering Agents)

ROW Hazard = φ (Geotechnichal Hazard, ROW Inspection findings)

Pipeline Exposure = φ (ROW Hazard, Pipeline Vulnerability)

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PIPELINE VULNERABILITY IN CENIT GEOHAZARDS MODEL

Is defined as the level of potential damage of transport infrastructure

Advances on

mitigation plan

GIS Analysis

INTEGRITY MANAGEMENT UNDER GEOHAZARD CONDITIONS

Pipelines design and construction consider industry standards that normally contemplate operation loads but not

necessarily analyses mechanical behavior due to geohazards

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DEFECTS IDENTIFIED ON IN-LINE INSPECTION (ILI)

ILI Detectable Dimensions of thickness loss

Source: API 1163 (2013). In-line Inspection Systems Qualification.

Second Edition, April 2013

A wide range of technologies are currently offered, which allow identify

anomalies generated by pipeline threats described on ASME or API

standards.

Techniques most used are those with Magnetic Flux Leakage sensors

(MFL) which allow to evaluate anomalies of thickness loss.

In the last years the ultrasonic testing (UT) techniques have been

developed and included on ILI programs:

• Straight Ultrasound beam used to measure wall thickness

• Angular Ultrasound beam allows crack detection

• Electro Magnetic Acoustic Transducer (EMAT) capable of identifying

zones with adhesion loss of coating or used to crack detection.

FITNESS FOR SERVICE ANALYSIS AND ASSESSMENT

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GIRTH WELD PERFORMANCE

Compliance of API 1104 standard brings acceptance and rejection criteria for

phases of welding and quality control using inspections with non-destructive tests

(VT, UT, MT, PT and RT) and allows to coexist with anomalies like lack of fusion, lack

of penetration, porosities, undercut, among others, with an established limit.

STRESS CORROSION CRACKING (SCC)

Variables according to the NACE standards that generate (SCC): Corrosive

environment, Material susceptibility and Stress applied

Geohazards are related with applied loads that generate membrane stresses

that intensify in interaction with a stress concentrator.

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PIPELINE BEHAVIOUR

CONCLUDING REMARKS

An adequate pipeline integrity management under geohazards conditions requires hazard and vulnerability analysis complemented with inspection and monitoring of the pipeline behavior to establishes risk management and assessment plans.

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25 de junio de 2019

Cursos Pre-Conferencia

26 y 27 de junio de 2019

Conferencia y Exhibición

Universidad Católica Argentina (UCA)

Buenos Aires, Argentina

MUCHAS GRACIAS.

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