Banca de DEFESA: PAULO FERNANDO SILVA SOUSA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PAULO FERNANDO SILVA SOUSA
DATE: 18/02/2022
TIME: 09:00
LOCAL: Auditório Programa de Pós-Graduação em Engenharia Civil (on line)
TITLE:

Maintenance Planning for Corroded Pipelines Using Surrogate Models

KEY WORDS:

Corroded pipelines; Reliability; optimization; maintenance planning.

PAGES: 96
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Pipelines are one of the safest ways of transport in the world. Most of the pipeline structure is buried, and can be operated remotely. This infrastructure, however, has been aging, and suffering from the effects of corrosion, which causes defects (thickness losses) along the pipe. These defects reduce the resistance of the pipeline, which has caused several accidents. Accidents involving pipelines are usually quite serious, because of their economic, environmental and social impacts. In this context, inspections and repairs should take place during the useful life of the pipes. Basically, increasing the number of inspections lead to higher security levels. However, these maintenance events are of great financial cost, because they usually require the excavation of the pipeline and the interruption or reduction of what is being transported. On the other hand, an insufficient number of inspections can make the pipeline reach very low levels of safety, with high failure probabilities. Therefore, this maintenance management problem is a problem of great relevance in the literature. In this work, maintenance planning is done in two ways: preventive maintenance based on reliability and optimal planning of maintenance costs. This thesis presents a new approach to these problems: the use of substitute models, built from finite element simulations, for calculating the burst pressure of the pipelines. The results indicate that the less responses for the schedule and also for maintenance costs using surrogate models for the burst pressure calculations are less conservative when compared to traditional approaches in the literature, which use only empirical methodologies to obtain the burst pressure of the corroded pipelines.

BANKING MEMBERS:
Externo à Instituição - MARCILIO SOUSA DA ROCHA FREITAS - UFOP
Externo à Instituição - ANDRE TEOFILO BECK - USP
Interno - 2250444 - RENATO DE SIQUEIRA MOTTA
Presidente - 2223613 - SILVANA MARIA BASTOS AFONSO DA SILVA
Interno - 2994651 - TIAGO ANCELMO DE CARVALHO PIRES DE OLIVEIRA