NORSOK N-006-2009 Assessment of structural integrity for existing offshore load-bearing structures

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This NORSOK standard is developed with broad petroleum industry participation by interested parties in the

Norwegian petroleum industry and is owned by the Norwegian petroleum industry represented by The Norwegian

Oil Industry Association (OLF) and The Federation of Norwegian Industry. Please note that whilst every effort has

been made to ensure the accuracy of this NORSOK standard, neither OLF nor The Federation of Norwegian

Industry or any of their members will assume liability for any use thereof. Standards Norway is responsible for the

administration and publication of this NORSOK standard.

Standards Norway Telephone: + 47 67 83 86 00

Strandveien 18, P.O. Box 242 Fax: + 47 67 83 86 01

N-1326 Lysaker Email: petroleum@standard.no

NORWAY Website: www.standard.no/petroleum

Copyrights reserved

NORSOK STANDARD N-006

Edition 1, March 2009

Assessment of structural integrity for existing

offshore load-bearing structures

NORSOK standard N-006 Edition 1, March 2009

NORSOK standard Page 3 of 58

Foreword 4

Introduction 4

Scope 5

Normative and informative references 5

2.1

Normative references 5

2.2

Informative references 5

Terms, definitions, abbreviations and symbols 6

3.1

Terms and definitions 6

3.2

Abbreviations 6

3.3

Symbols 7

Assessment process 7

4.1

General 7

4.2

Structural assessment initiators 9

Data collection 10

5.1

General 10

5.2

Collection of data 10

5.3

Requirements to in-service inspection to assess as-is condition 11

Assessment principles for existing structures 12

6.1

General 12

6.2

Assessment of maritime systems 12

6.3

Shut-down and unmanning criteria related to structural integrity 12

6.4

Shut-down and unmanning criteria related to main safety functions 12

6.5

Structural requirements due to pollution risk 13

6.6

Determination of directional wave criteria 13

Check of fatigue limit states (FLS) 13

7.1

General 13

7.2

Fatigue analysis procedure 17

7.3

Assessment of details that can not be inspected 17

7.4

Specific issues for fatigue assessment 20

7.5

Acceptance criteria for fatigue crack growth 20

7.6

Improvement methods 20

7.7

Mitigations for fatigue 21

Check of ultimate limit states (ULS) and accidental limit states (ALS) 21

8.1

General 21

8.2

Action and material factors for assessment of existing structures 21

8.3

Requirements to assessment based on analysis with non-linear methods 21

8.4

Resistance to cyclic storm actions 22

8.5

Wave-in-deck actions 25

8.6

Effect of corrosion and wear 25

8.7

Suggested mitigation possibilities 25

Requirements to in-service inspection after assessment 25

9.1

General 25

9.2

Risk based inspection 26

9.3

Effect of different crack growth characteristics on inspection interval 28

Documentation of structural assessment 28

Annex A Commentary (informative) 29

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摘要：

This document provides a comprehensive overview of the NORSOK N-006-2009 standard, which outlines the methodology for assessing the structural integrity of existing offshore load-bearing structures. It covers key principles such as inspection plannin

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NORSOK N-006-2009 Assessment of structural integrity for existing offshore load-bearing structures

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