Table of Contents

1 SCOPE
    1.1 Initial Task Group Charge
    1.2 Amended Task Group Charge
2 GENERAL HISTORY OF API 6A/6D ACTIVITIES RELATIVE TO
    IMPACT TESTING OF MATERIALS
3 MATERIALS TOUGHNESS TASK GROUP HISTORY
4 API SPECIFICATION 6A, FIFTEENTH EDITION - BRITTLE
    FRACTURE PREVENTION BENEFITS
    4.1 General
    4.2 Design Considerations Now Required
    4.3 Design Methods Now required
    4.4 Materials Requirements Now Included
    4.5 Comprehensive Welding Requirements Have Been
         Established
    4.6 Important New Quality Control Requirements
         Have Been Added
5 ANALYSIS
    5.1 Approach
    5.2 The Use of CVN Requirements in Materials
         Specifications
         5.2.1 Historical Background
         5.2.2 Quality Assurance
         5.2.3 Fitness-for-Purpose Analyses
    5.3 API 6A Task Group Fitness - For Purpose
         Analysis
         5.3.1 Assumptions
         5.3.2 Design Stress
         5.3.3 Defect Size
         5.3.4 KIC-CVN Correlations
         5.3.5 Derivation of the CVN Toughness
                Requirement
         5.3.6 Discussion
         5.3.7 Conclusions
APPENDIX A - REFERENCES AND BIBLIOGRAPHY
Figures
1 CVN Values for 75K Material - Surface Crack and 50
   ksi Stress
2 CVN Values for 75K Material - Surface Crack and 75
   ksi Stress
3 CVN Values for 75K Material - Volumetric Crack and
   50 ksi Stress
4 CVN Values for 75K Material - Volumetric Crack and
   75 ksi Stress
Tables
1 CVN Values Derived by KIC-CVN Correlations

Abstract

Describes CVN toughness requirements as quality assurance measure to screen materials to minimize brittle fracture of wellhead and christmas tree equipment in field.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	American Petroleum Institute
Pages
ISBN