Research Papers

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

[+] Author and Article Information
Arvind Keprate

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

R. M. Chandima Ratnayake

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

1Corresponding author.

Manuscript received March 15, 2017; final manuscript received July 20, 2017; published online October 3, 2017. Assoc. Editor: James Lambert.

ASME J. Risk Uncertainty Part B 4(2), 021006 (Oct 03, 2017) (12 pages) Paper No: RISK-17-1044; doi: 10.1115/1.4037353 History: Received March 15, 2017; Revised July 20, 2017

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 Energy Institute (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 paper 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-analytical hierarchy process (FAHP) methodology to identify fatigue critical systems (and the most dominant excitation mechanism) and is briefly discussed in the paper. 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.

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Fig. 2

Schematic of the proposed generic RAP

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Fig. 3

Schematic of three-staged RAP. Adapted from Ref. [10].

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Fig. 10

A simplified process flow diagram of an offshore platform

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Fig. 11

Hierarchy tree for mainline piping in various units

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Fig. 7

Important steps during stage 2 of the proposed RAA

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Fig. 6

Schematic depicting structure of fuzzy logic method (Adapted from Ref. [14])

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Fig. 5

Important steps during stage 1 of proposed RAA

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Fig. 9

Steps to estimate RFL using PCG model

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Fig. 8

Uncertainty sources during RFL assessment of offshore piping

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Fig. 4

Qualitative assessment during stage 1 of the RAP (Adapted from Ref. [2])

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Fig. 12

Analysis result of stage 1 of the proposed RAA

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Fig. 13

MFs for input and output variables of stage 2 of RAA

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Fig. 14

Rule view and computation of LoF for line 1

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Fig. 15

Rule view and computation of LoF for line 2




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