1

Risk Based Inspection

March 2004 2

RBI Agenda

• RBI definition• Approaches to RBI• API RP 580 and Publication 581• API equipment scope• Risk• Risk matrix • Management of risk using RBI• RBI planning process• Database – CREDO• Current status RBI• OPQL program

March 2004 3

RBI Definition

• Risk Based Inspection (RBI) is a method for using risk as a basis for prioritizing and managing the efforts of an Inspection program

March 2004 4

Approaches to RBI

There are many different forms of RBI programs

• API RP 580, Risk Based Inspection –Integrated with other practices API Code 510, Pressure Vessels; API Code 570, Piping etc…

• API Publication 581,

March 2004 5

API RP 580 and Publ. 581

API RP 580• Outlines conceptual approaches

and necessary elements included in a quality RBI system

• Includes several approaches to RBI

API Publication 581• Outlines specific RBI

methodology• Is a step-by-step approach that

contains necessary elements to satisfy RP 580

March 2004 6

API Equipment Scope

Equipment covered• Pressure vessels• Process piping• Heat exchangers• Storage tanks• Heaters and boilers

March 2004 7

Risk

Risk is a product of the likelihood of failure (LOF) and the consequence of failure (COF).

RISK = PROBABILITY x CONSEQUENCE

March 2004 8

Management of Risk using RBI

Level of Inspection Activity

Leve

l of R

isk

Risk Using RBI Residual Risk Not Affected by RBI

Risk with Typical Inspection Program

March 2004 9

Risk Matrix

1 2 3 4 5

E

A

D

C

B

Pro

babi

lity

Cat

egor

y

Consequence Category

High Risk

Medium Risk

Low Risk

Qualitative Risk Matrix

March 2004 10

RBI Planning Process

CREDO Expert Group

CREDO Inspection Engineer

Corrosion Engineer

Data andInformationCollection

ConsequenceOf Failure

ProbabilityOf Failure

RiskRanking

InspectionPlan Mitigation

Reassessment

Risk Assessment

March 2004 11

Database - CREDO

March 2004 12

Expert Group

Problem• No single person has all the skills and experience necessary to carry

out the assessment

Solution• Use a multi-discipline team or ‘expert group’ with collective

responsibility for carrying out the risk assessment

March 2004 13

Expert Group Members

• Team leader• Inspection specialist• Materials and Corrosion specialist• Process specialist• Operations representative• Maintenance representative• Safety and Environmental representative

March 2004 14

Database - CREDO

March 2004 15

Current Status RBI

• OPQL applied API 510 and internal standard for Vessels• Vessels and Pipework, ICB (BV) RBI analysis

- risk ranking and inspection frequencies identified

• Subsea - independent assessment based on QP standard and five year plan identified - 2003 100% local surveys carried out around complex

• Trained personnel

March 2004 16

OPQL Program

STRATEGY - DEVELOP OPQL METHODOLOGY AND RBI SYSTEM 01-Feb-04 18-Apr-04

RBI SYSTEM TRAINING - EXTERNAL 01-Jan-04 15-Feb-04

RBI SYSTEM TRAINING - INTERNAL 01-Apr-04 30-Apr-04

DATA GATHERING - POPULATE CREDO 01-Dec-03 31-Jul-04

EXPERT GROUP ASSESSMENT - MULTI DISCIPLINE TEAM APPROACH 18-Apr-04 31-Jul-04

DOCUMENT PROCESS - RBI SOFTWARE IN CREDO 18-Apr-04 31-Jul-04

VALIDATION OF RBI METHODOLOGY AND ANALYSYS 01-May-04 31-May-04

PLANS AND PRIORITIES 01-Mar-04 31-Jul-04

REASSESSMENT OF RBI 01-Aug-04 31-Aug-04

OPQL RBI PROGRAM

May-04 Jun-04 Jul-04Jan-04 Feb-04 Mar-04 Apr-04ACTIVITY Start Finish Dec-03 Aug-04