12. dnv. decom esbjerg 2007 - offshoreenergy.dk |. dnv.pdf · · 2013-04-29- dnv-oss-401,...

DECOM Esbjerg 2007

Quality Assurance on decommissioning projects

Jan Egil Sæberg11th October 2007

© Det Norske Veritas AS. All rights reserved Slide 215 October 2007

Norwegian Continetal Shelf

� First discovery 1969

� 35% of expected prod. produced

� 2006 production 2.8 M barrels/day

� 52 fields in production

� > 10 decommissioning plans

approved


Lifetime extension vs decommissioning

� Liftetime extension

- Political incitements

- Use of existing infrastructure

- New technology

- More effective operations (IO)

- High oil prices

© Det Norske Veritas AS. All rights reserved Slide 415 October 2007Ekofisk

Decommissioning projects

Frigg


Regulations and guidelines

� Petroleum Act

(Requirements to exploration, development and transportation of petroleum on the Norwegian Continental Shelf)

- OSPAR Conventions (guidelines for various disposal alternatives that are

acceptable for various types of marine installations)

- White Paper no.47 ”Decommissioning of redundant pipelines and cables”

- DNV Standards and Recommended Practices



�Risk Based Verification (RBV)- An effective approach to manage risk during planning

and execution of decommissioning campaigns- DNV-OSS-300, Risk Based Verification

- DNV-RP-H102, Marine Operations during Removal of Offshore Installations

�Qualification of New Technology- A process of providing the evidence that a technology

will function reliable within specific limits- DNV-OSS-401, Technology Qualification Management

- DNV-RP-A203, Qualification Procedures for New Technology



Proven Technology

Experience-based risk

assessment Risk AssessmentRisk Assessment

New Technology

Project specific risk

assessment

� Trigger Questions

� DNV OSS-

Pre-defined Tables

based on judgment,

knowledge and experience

� Best Industry Practices

� HAZID, HAZOP, QRA, etc.

� DNV-OSS detailed specific

plan

� High risk elements

Increasing

Low High

Low

High

LOW

MEDIUM

HIGH

Pro

ba

bility

of F

ailu

reConsequence of Failure


The RBV Process

Verification Execution & Reporting

Verification Completed

Verification Plan

Definition of Verification Involvement (Risk Screening)

Risk Assessment

Campaign & Asset SpecificationCampaign & Asset Specification

Planned Campaign


The Greater Ekofisk Area


2/4T Topside Deconstruction and Removal

� Structural and SHE Verification

- of the planning and engineering of the offshore deconstruction and removal operations

- “Piece-small” removal method (excavators, container shipment to shore)

� Approach based on DNV-OSS-300, Risk Based Verification


RBV Approach – 2/4T Topside Removal

� Familiarization

- Brief review of Contractor documents and plans

- Preparation of Hazid table and systematic

� HAZID work session- Identification of safety critical elements

- Contractor, Company, DNV;

Systematic review & risk assessment of operations in each Work Package (area)

� Verification Plan

- Screening of Safety Critical Elements

- Identify levels of involvement

- Establish schedule and break-down of work

- Issue the V-plan for comments and approval

� Work execution

- Review of Work Packages (WP), Job Packages (JP), Procedures and Safe Job Analyses (SJA)

- Independent structural analyses

- FMECA (use of excavators as lifting appliences)

- Issue Comment Letters and Verification Reports


RBV Approach – FRIGG Removal

Structural Verification of Planned Campaigns

� Familiarisation (review of plans and activities)

� Criticality review of each planned campaign

� Risk screening

� Preparation of

Verification Plan

� Work execution

� Reporting

Technical Risk Matrix

A

Occurrence once in

> 100000 operations

B

Occurrence once in

10000 < 100000

operations

C

Occurrence once in

1000 < 10000 operations

D

Occurrence once in

100 < 1000 operations

E

Occurrence once in

1 < 100 operations

5

Catastrophic Risk > 12 months

delay

M

M

H

H

H

4

Major Risk

1 < 12 months delay

L

M

M

H

H

3

Significant Risk

5 < 30 days delay

L

L

M

M

M

2

Minor Risk

< 5 days delay

L

L

L

M

M

1

No risk

L

L

L

L

L


RBV Approach – FRIGG Removal

� Criticality Assessment of Lifts


RBV Approach – FRIGG Removal Principles

� Risk Screening of Identified Lifts


Single Lift Units


Qualification of New Technology

� Qualification of Single Lift Concepts tendering for removal contract

� Criticality assessment of technical solutions and identificationof critical steps in the planned removal operations

� Maturity assessment

� Definition of required activities (qualification program) to reduce identified risk

� Re-assessment of risk


Qualification of Single Lift Units

432New

321Known

New or

unproven

Limited field

historyProven

Technology statusApplication

area

Class 2, 3 & 4

Failure Mode Identification

and Risk Ranking

Selection of Qualification Program

Probability of Success Evaluation

Qualification Program Execution

Risk Re-assessment & Reporting

Define Qualification Basis

Technology Assessment

Ok

Class 1

Make DecisionsCertificate of

Fitness for

Service

Compliance to

Qualification

Basis?

TECHNICAL REPORT

DET NORSKE V ERITAS

Technology

Qualification

Report

T EC H NIC A L R EP O RT

D E T N O RS K E V E RIT A S

Technology

Qualification

Report

YesNo

Technology Class

12. dnv. decom esbjerg 2007 - offshoreenergy.dk |. dnv.pdf · · 2013-04-29- dnv-oss-401,...

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