Staff View: Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection

Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection

Abstract—Piping systems in refineries and petrochemical plants are exposed to corrosive environment causing various types of degradation mechanisms. One of the damage mechanisms experienced is gradual wall thinning that causes the pipe to leak. Since the piping systems carry hydrocarbons or other pr...

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Main Authors:	Mokhtar, Ainul Akmar, che ismail, mokhtar, mohamad, masdi
Format:	Citation Index Journal
Published:	2009
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utp.edu.my/1767/1/Comparative_Study_between_Degradation_Analysis_and_First_Order_Reliability_Method_for_Assessing_Piping_Reliability_for_Risk-Based_Inspection.doc.pdf http://eprints.utp.edu.my/1767/
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spelling	my.utp.eprints.17672017-03-20T02:00:01Z Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection Mokhtar, Ainul Akmar che ismail, mokhtar mohamad, masdi TJ Mechanical engineering and machinery Abstract—Piping systems in refineries and petrochemical plants are exposed to corrosive environment causing various types of degradation mechanisms. One of the damage mechanisms experienced is gradual wall thinning that causes the pipe to leak. Since the piping systems carry hydrocarbons or other process fluids, the presence of small leak may lead to a hazardous situation. Therefore, proper inspection and maintenance of these systems is essential for maintaining a safe and continuous operation. Risk-based inspection (RBI) strategy has been adopted to establish the inspection strategy for piping systems where the strategy is based on risk calculated. Risk is defined as the product of the probability of failure and its consequences of failure. Assessing the failure probability for piping systems in RBI approach typically follows the guideline by American Petroleum Institute (API 581) where the method is deterministic. This study explores the available probabilistic analysis techniques in estimating the piping failure probability, namely, degradation analysis and first-order reliability method (FORM). The objective of this paper is to estimate the pipes failure probability using these two techniques where both models require different input data. Degradation analysis only uses the pipe wall thickness data that are usually being collected during inspection for pipes subject to wall thinning. Conversely, FORM model requires data on material properties and physical geometric of the piping system to estimate the failure probability. The failure probability estimated by these two techniques are then compared and discussed. The results showed that the degradation analysis is more conservative compared to FORM. 2009-12-10 Citation Index Journal PeerReviewed application/pdf http://eprints.utp.edu.my/1767/1/Comparative_Study_between_Degradation_Analysis_and_First_Order_Reliability_Method_for_Assessing_Piping_Reliability_for_Risk-Based_Inspection.doc.pdf Mokhtar, Ainul Akmar and che ismail, mokhtar and mohamad, masdi (2009) Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection. [Citation Index Journal] http://eprints.utp.edu.my/1767/
institution	Universiti Teknologi Petronas
building	UTP Resource Centre
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Petronas
content_source	UTP Institutional Repository
url_provider	http://eprints.utp.edu.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Mokhtar, Ainul Akmar che ismail, mokhtar mohamad, masdi Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection
description	Abstract—Piping systems in refineries and petrochemical plants are exposed to corrosive environment causing various types of degradation mechanisms. One of the damage mechanisms experienced is gradual wall thinning that causes the pipe to leak. Since the piping systems carry hydrocarbons or other process fluids, the presence of small leak may lead to a hazardous situation. Therefore, proper inspection and maintenance of these systems is essential for maintaining a safe and continuous operation. Risk-based inspection (RBI) strategy has been adopted to establish the inspection strategy for piping systems where the strategy is based on risk calculated. Risk is defined as the product of the probability of failure and its consequences of failure. Assessing the failure probability for piping systems in RBI approach typically follows the guideline by American Petroleum Institute (API 581) where the method is deterministic. This study explores the available probabilistic analysis techniques in estimating the piping failure probability, namely, degradation analysis and first-order reliability method (FORM). The objective of this paper is to estimate the pipes failure probability using these two techniques where both models require different input data. Degradation analysis only uses the pipe wall thickness data that are usually being collected during inspection for pipes subject to wall thinning. Conversely, FORM model requires data on material properties and physical geometric of the piping system to estimate the failure probability. The failure probability estimated by these two techniques are then compared and discussed. The results showed that the degradation analysis is more conservative compared to FORM.
format	Citation Index Journal
author	Mokhtar, Ainul Akmar che ismail, mokhtar mohamad, masdi
author_facet	Mokhtar, Ainul Akmar che ismail, mokhtar mohamad, masdi
author_sort	Mokhtar, Ainul Akmar
title	Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection
title_short	Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection
title_full	Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection
title_fullStr	Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection
title_full_unstemmed	Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection
title_sort	comparative study between degradation analysis and first order reliability method for assessing piping reliability for risk-based inspection
publishDate	2009
url	http://eprints.utp.edu.my/1767/1/Comparative_Study_between_Degradation_Analysis_and_First_Order_Reliability_Method_for_Assessing_Piping_Reliability_for_Risk-Based_Inspection.doc.pdf http://eprints.utp.edu.my/1767/
_version_	1738655152068362240
score	13.211869

Comparative Study between Degradation Analysis and First Order Reliability Method for Assessing Piping Reliability for Risk-Based Inspection

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