GERENCIAMENTO DA INTEGRIDADE DE EQUIPAMENTOS UTILIZANDO A INSPEÇÃO BASEADA EM RISCO / INTEGRITY MANAGEMENT THROUGH RISK BASED INSPECTION

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This dissertation deals with the general concepts of risk and risk based inspection (RBI) and presents a procedure that integrates risk based inspection and fitnessfor- service tools as presented in API 581 and API 579 respectively, to manage the structural integrity of static equipments and piping subjected to a corrosion mechanism. Risk of failure is quantitatively assessed by calculating the product of probability of failure (PoF) and consequence of failure (CoF). Equipment deterioration leads to an increase of PoF along time, which is dependent on damage rate, confidence on rate prediction, and inspection tools effectiveness in detecting and quantifying the damage. The equipment failure may result in some consequences outcomes such as safety and health impact; production losses; maintenance and reconstruction cost; and environmental impact. A computer program to manage the equipment integrity was developed based on the RBI procedure. It allows to design and optimize an inspection plan for the equipment, taking in the consideration the amount of inspection activity and its effectiveness, while maintaining risk under a tolerable level. An application example is developed for an oil and gas separator which is subjected to internal and external corrosion. PoF and CoF are calculated quantitatively. The inspection plan proposed follows the Brazilian regulation concerned to boilers and pressure vessels (NR-13) in what refers to the maximum inspection intervals, considering the inspection effectiveness (external, internal and hydrostatic test) used to detect and evaluate the damage mechanism. It is showed that the proposed inspection plan will maintain the risk of a failure under a certain tolerable level and will provide better application of inspection resources.

ASSUNTO(S)

integridade estrutural structural integrity reliability risk confiabilidade risco

ACESSO AO ARTIGO

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