STP-PT-007

COMPARISON OF PRESSURE VESSEL CODES ASME SECTION VIII AND EN13445

Technical, Commercial, and Usage Comparison

Design Fatigue Life Comparison

STP-PT-007

COMPARISON OF PRESSURE VESSEL CODES ASME SECTION VIII AND EN13445

Technical, Commercial, and Usage Comparison Design Fatigue Life Comparison

Date of Issuance: December 12, 2006

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Comparison of ASME Code and EN13445 STP-PT-007

TABLE OF CONTENTS

FOREWORD iv

ABSTRACT v

PART I - PVP2006-ICPVT11-94010: Comparison on Pressure Vessel Codes ASME Section VIII and EN13445 1

ABSTRACT 2

1. INTRODUCTION 3

2. REVIEW OF “COMPARATIVE STUDY EN 13445 AND ASME SECTION VIII, DIV. 1

   AND 2” 3

3. CODE PARAMETER COMPARISONS 4

   1. Material Properties 4

   2. Carbon and Low Alloy Ferritic Steels 4

   3. Austenitic Stainless Steels 5

   4. Design Rules 9

   5. Heat Treatments 10

   6. NDE/Inspection Requirements 11

4. COST STRUCTURE BREAKDOWN 11

5. SURVEY ANALYSIS 15

6. CONCLUSION 21

ACKNOWLEDGMENTS 22

REFERENCES 23

PART II - PVP2006-ICPVT11-93059: Design Fatigue Life Comparison of ASME Section VIII

and EN 13445 Vessels with Welded Joints 25

ABSTRACT 26

NOMENCLATURE 27

1. INTRODUCTION 28

2. ASSESSING DESIGN LIFE FOR WELDED JOINTS 28

3. FSRF’S IN SECTION VIII DIVISION 2 29

4. EXAMPLE 3 OF EC STUDY 30

   1. Fatigue Analysis in the EC Study 30

   2. Fatigue Analysis by ASME Code 30

5. EXAMPLE 4 OF EC STUDY 31

   1. Batch Operation 31

   2. Stirrer Operation 32

6. DISCUSSION 32

7. CONCLUSIONS 33

ACKNOWLEDGMENTS 34

REFERENCES 35

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STP-PT-007 Comparison of ASME Code and EN13445

FOREWORD

This report presents two papers presented during the 2006 ASME Pressure Vessels and Piping Division Conference held July 23-27, 2006, in Vancouver, BC, Canada. The papers have also been published by ASME along with the Proceedings of PVP2006-ICPVT-11. The papers resulted from projects sponsored by ASME in response to the “Comparative Study on Pressure Equipment Standards”, published in June 2004 by the European Commission, Enterprise Directorate-General.

The American Society of Mechanical Engineers (ASME) is a not-for-profit professional organization promoting the art, science and practice of mechanical and multidisciplinary engineering and allied sciences. ASME develops codes and standards that enhance public safety, and provides lifelong learning and technical exchange opportunities benefiting the engineering and technology community. Visit www.asme.org.

The ASME Standards Technology, LLC (ASME ST-LLC) is a not-for-profit Limited Liability Company, with ASME as the sole member, formed in 2004 to carry out work related to newly commercialized technology, expanding upon the former role of ASME’s Codes and Standards Technology Institute (CSTI). The ASME ST-LLC mission includes meeting the needs of industry and government by providing new standards-related products and services, which advance the application of emerging and newly commercialized science and technology and providing the research and technology development needed to establish and maintain the technical relevance of codes and standards. Visit www.stllc.asme.org for more information.

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Comparison of ASME Code and EN13445 STP-PT-007

ABSTRACT

Part I of this report includes paper PVP2006-ICPVT11-94010, “Comparison of Pressure Vessel Codes ASME Section VIII and EN13445.” This paper consists of a comparative study of the primary technical, commercial, and usage differences between the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code Section VIII and the European Pressure Vessel Code EN13445 (EN). This study includes a review of “Comparative Study on Pressure Equipment Standards” published by the European Commission (EC) and provides technical comparisons between the code design requirements, material properties, fabrication, and contributing effects on overall cost. This study is intended to provide a broad viewpoint on the major differences and factors to consider when choosing the most appropriate vessel design code to use.

Part II of this report includes paper PVP2006-ICPVT11-93059, “Design Fatigue Life Comparison of ASME Section VIII and EN 13445 Vessels with Welded Joints.” The “Comparative Study on Pressure Equipment Standards” performed by the EC included a comparison of design fatigue life of welded vessels allowed by the ASME Boiler and Pressure Vessel Code (B&PVC) Section VIII with that of the European Standard EN 13445. The allowable number cycles of the ASME Code was reported to be much larger than that of EN 13445, and, therefore, the ASME Code was regarded as unconservative for welded regions. This paper investigates the reason for the reported discrepancy between the two design codes, identifies errors in the EC calculation, recalculates the allowable cycles according to ASME Code rules and concludes that they are comparable with those of EN 13445.

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