RISK BASED INSPECTION- The focus of this presentation

Transcription

1 RISK BASED INSPECTION- The focus of this presentation BEFORE 1995 WHAT IS THE STATUS NOW? RBI IN THE CONTEXT OF RCM? WOODSIDE - METHODOLOGY, APPLICATION AND BENEFITS RBI CONFERENCE IN PERTH, APRIL 00. FEEDBACK & FUTRE INITIATIVES QUESTIONS/ DISCUSSION Prepared by : Randeep Agarwal, Woodside Energy Slide No: 1

2 Why RBI? Rigid regulatory regimes Business driver to optimise run lengths and minimise risks. Risk Understanding for prioritisation of work. Industry initiative towards flexible approach in inspection of pressure equipment Slide No: 2

3 What is in RBI? 1.Probability Consequences Confidence Rating Likely failure Explosion Reliability of modes Fire Detection Environmental Business 2. Assessment of the factors can be qualitative, semi quantitative and fully quantitative. Slide No: 3

4 Risk Based Inspection - What happened then? Some of the Project Sponsors ($20 million) API UNOCAL TEXACO BP EXXON CONOCO SHELL MOBIL ASHLAND DNV/API worked in conjunction to develop a base resource document on RBI in Slide No: 4

5 RBI Methodology and process - where are we now? AS3788, Appendix B4 - Recognition of RBI in new version, due for release in March 01. API Recommended methodology by API API Recommended practice by API Slide No: 5

6 Risk Based Inspection - In the context of RCM Functional Failure Mode 1 RCM Failure Mode 2 Failure Mode 3 Loss of Containment * Special knowledge & expertise * team structure is diffrent to RCM (Mech, materials/corrosion, ops, process, inspection) * Some failure modes happen over long period RBI A Team approach being the common denominator Slide No: 6

7 RBI Studies - What can be included? What does it include? Piping Pressure Vessels Tanks Reactors Heat Exchangers Boilers/ Heaters & Applicable to Internal and External modes for all of the above. What is usually not included? Non pressurised equipment Instrument and control systems Electrical equipment Machinery components Slide No: 7

8 RBI management Process Plant Database Risk Based Prioritisation Inspection Planning Inspection records Fitness for Service Inspection Update System Audit Slide No: 8

9 Barriers to implementation of RBI * Up front discussion involvement of regulatory bodies * Understanding of RBI Methodology * Credibility of RBI Methodology - Not a tool to justify taking risks. * Resources - Team; ops, process, material/corrosion, inspection & maintenance, mechanical etc - Coordinator - Management Champion Slide No: 9

10 RBI Conference April 2000, Perth - Some feedback *Sponsored by Woodside and BP * More than 100 participants from Australia and overseas * Extremely good papers from Australia and overseas * Need to have the similar meetings on this 1/ 2 yearly interval. * Industry and regulatory bodies need to network on the subject Slide No: 10

11 Methodology for Inspection Intervals Probability Confidence / Predictability Consequenc e Inspection History Extrapolation Theoretical Estimation Criticality Assessment or Safety Factor X Remnant Life Inspection Interval Slide No: 11

12 System Annual review Inspection history Gather data Allocate corrosion loops Multi-disciplinary workshop Check damage modes Damage possible? N No damage Y N Inspectable Y Set inspection interval Opportunistic inspections Set inspection intervals (barriers) Set Inspection scopes Integrity monitoring Slide No: 12

13 Typical Information Recorded For Corrosion Loops Corrosion Loop ID Ref Drawings Process Description Equipment Data SCHEMATIC Inspection History Process Parameters ( * = Critical ) Potential Damage Modes For The Loop Criticality Assessment Probability Confidence Consequence Inspection and Scope Intervals Integrity Monitoring Slide No: 13