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research-article

Generic Approach for Risk Assessment of Offshore Piping Subjected to Vibration Induced Fatigue

[+] Author and Article Information
Arvind Keprate

University of Stavanger, Department of Mechanical and Structural Engineering and Material Science, University of Stavanger, 4036, Norway
arvind.keprate@uis.no

R.M. Chandima Ratnayake

University of Stavanger, Department of Mechanical and Structural Engineering and Material Science, University of Stavanger, 4036, Norway
chandima.ratnayake@uis.no

1Corresponding author.

ASME doi:10.1115/1.4037353 History: Received March 15, 2017; Revised July 20, 2017

Abstract

Vibration induced fatigue (VIF) failure of topside piping is one of the most common causes of the hydrocarbon release on offshore oil and gas platforms operating in the North Sea region. An effective inspection plan for the identification of fatigue critical piping locations has the potential to minimize the hydrocarbon release. One of the primary challenges in preparation of inspection program for offshore piping is to identify the fatigue critical piping locations. At present, the three-staged risk assessment process (RAP) given in the EI guidelines is used by inspection engineers to determine the likelihood of failure (LoF) of process piping due to VIF. Since the RAP is afflicted by certain drawbacks, this manuscript presents an alternative risk assessment approach (RAA), to RAP for identification and prioritization of fatigue critical piping locations. The proposed RAA consists of two stages. The first stage involves a qualitative risk assessment using Fuzzy-AHP methodology to identify fatigue critical systems (and the most dominant excitation mechanism) and is briefly discussed in the manuscript. The fatigue critical system identified during stage 1 of RAA undergoes further assessment in the second stage of the RAA. This stage employs a fuzzy-logic method to determine the LoF of the mainline piping. The outcome of the proposed RAA is the categorization of mainline piping, into high, medium or low risk grouping. The mainline piping in the high-risk category is thereby prioritized for inspection. An illustrative case study demonstrating the usability of the proposed RAA is presented.

Copyright (c) 2017 by ASME
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