NDLI: Progress Towards the Revision of BS 7910

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hadley, Isabel
Copyright Year	2011
Abstract	BS 7910, the UK procedure for the assessment of flaws in metallic structures, is being revised with a view to publication in 2012. Like the existing procedure, the new procedure will address all major failure/damage mechanisms, namely fracture, fatigue, creep and corrosion, and is intended to be used across a range of industry sectors and component types. There are several major proposed changes, which draw mainly on the existing BS 7910 procedures, the UK nuclear industry’s R6 document and the European FITNET procedure. The most far-reaching changes are in Section 7 (fracture) and related annexes. Here, the modifications include: • a re-structuring of the fracture assessment procedures from their present form (Levels 1–3) to a new hierarchy based on Options 1–3, which are more compatible with the current R6 and FITNET approaches, • revised treatment of flaw interaction, • a new annex (Annex N) permitting analysis under conditions of reduced crack tip constraint, • a new annex (I) addressing analysis of weld strength mismatch, • a revised residual stress compendium (Annex Q). As part of the revision, all annexes will be reviewed and edited where necessary, and a new annex on non-destructive examination (NDE) will be included for the first time. In view of the fact that many of the major changes concern the fracture assessment clauses, this paper presents a case study based on the analysis of a fully-circumferential flaw in a pipeline girth weld. The basic assessment Options (1 and 2) given in the new procedure are used to analyse the flaw, and three more advanced techniques (constraint-based assessment, assessment using an idealised residual stress distribution and analysis based on weld strength mismatch) are also applied.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	819
Ending Page	827
Page Count	9
File Format	PDF
ISBN	9780791844519
DOI	10.1115/PVP2011-57307
Volume Number	Volume 1: Codes and Standards
Conference Proceedings	ASME 2011 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2011-07-17
Publisher Place	Baltimore, Maryland, USA
Access Restriction	Subscribed
Subject Keyword	Stress concentration Nondestructive evaluation Corrosion Creep Pipelines Fatigue Fracture (materials) Damage Failure Stress
Content Type	Text
Resource Type	Article

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The Future of the BS 7910 Flaw Assessment Procedures

BS 7910: History and Future Developments

Development of the BS 7910 Failure Assessment Diagram for Strain Based Design With Application to Pipelines

Fatigue of Risers and Pipeline Girth Welds

Long Seam Welds in Gas and Liquids Pipelines and Near-Neutral pH Stress Corrosion Cracking and Corrosion Fatigue

Effects of Mechanical Loading on Residual Stress and Fracture: Part I — Background to the BS 7910:2013 Rules

Effects of Mechanical Loading on Residual Stress and Fracture: Part II — Validation of the BS 7910:2013 Rules

Creep Deformation and Failure Assessment of Steel Weldments

Non-Destructive Evaluation of Creep Damage in a Nickel Base Super-Alloy Turbine Bucket

Progress Towards the Revision of BS 7910

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The Future of the BS 7910 Flaw Assessment Procedures

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Development of the BS 7910 Failure Assessment Diagram for Strain Based Design With Application to Pipelines

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