BS 7910:2019 Guide to methods for assessing the acceptability of flaws in metallic structures

BS 7910:2019

Guide to methods for assessing the acceptability of flaws in metallic structures

Status : Current   Published : December 2019



What is this standard about?

This British Standard is a guide to assessing if flaws in metallic structures are acceptable. It’s particularly relevant wherever structural integrity is important e.g. pipelines, shipbuilding, turbines, engines, vehicle manufacturing and pressure vessels and equipment.

Who is this standard for?

It’s for industries where any two pieces of metal are welded together. Users will be:

  • Risk assessors
  • Engineering consultancies
  • Oil and gas companies
  • Steels manufacturers
  • Manufacturers of products using welded steel
  • Automotive and aerospace manufacturers

Why should you use this standard?

It gives guidance and recommendations for assessing the acceptability of flaws in all types of structures and components.

Although the standard emphasizes welded fabrications in ferritic and austenitic steels and aluminium alloys, the procedures can be used for analysing flaws in structures made from other metallic materials and in non-welded components or structures. The methods described apply at the design, fabrication and operational phases of the life of a structure.

The standard allows metallic structures to be assessed for fitness of purpose rather than adherence to design and fabrication codes, in order to demonstrate margins for continued operation of the welded structure.

BS 7910 is used to perform an assessment of an existing flaw and support continued operation/repair/replacement decisions, and/or to determine a limiting flaw size for a component subject to a given operating environment and to determine the time to reach the limiting state.

It’s used for sentencing unexpected flaws found in welded joints, failure analysis, setting inspection acceptance criteria, justifying waiver of post-weld heat-treatment, extending the life of structures and justifying deviations from a design code. Specific applications include:

  • Assessing a known flaw to determine the fitness-for-service of a flawed structure
  • Calculating the defect-tolerance of a structure to inform materials selection, load capacity or inspection requirements
  • Justifying waiver of post-weld heat-treatment in thick-walled steel structures      

The standard applies to a wide range of different types of materials and structures and to different stages in the lifecycle (design, manufacture, operation, repair, life extension, failure investigation).

What’s changed since the last update?

There are two main changes. The document has been broken down into self-contained clauses and annexes, each with its own bibliography, tables, equations, figures and symbols. This will improve the flexibility and agility of the document in years to come. Also a new Annex V has been added, on strain-based assessment and design.

Standard NumberBS 7910:2019
TitleGuide to methods for assessing the acceptability of flaws in metallic structures
Publication Date13 December 2019
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)BS EN ISO 17636-2, BS ISO 12108, BS EN ISO 22825, ASTM E1921, BS EN ISO 13588, BS EN ISO 10863, BS EN 17640, BS EN ISO 17638, BS EN ISO 6892-2, BS EN ISO 15548, BS EN ISO 6520-1, BS EN ISO 17643, BS EN ISO 15626, BS EN ISO 19285, BS EN ISO 17637, ASME Boiler and Pressure Vessel Code Section III, BS 7608, BS EN 10025-2, BS EN ISO 23278, BS EN ISO 3452, BS EN 1370, BS EN ISO 10675, BS EN 1993-1-2, BS 8571, PD 5500, BS EN ISO 6892-3, ASME Boiler and Pressure Vessel Code Section II, BS 7448, ISO 12135, BS EN ISO 11666, BS EN ISO 15549, BS EN 10025-3, BS EN ISO 23277, BS EN ISO 7539, BS EN 10025-4, BS EN ISO 17636-1, BS EN ISO 15653, BS EN 1999-1-3, BS EN ISO 6892-1
ReplacesBS 7910:2013+A1:2015
Draft Superseded By19/30369477 DC
DescriptorsStructural systems, Austenitic steels, Classification systems, Impact testing, Fusion welding, Mathematical calculations, Steels, Strength of materials, Schematic representation, Creep, Defects, Stress analysis, Dimensions, Tubular shape, Symbols, Failure (mechanical), Structural design, Graphic representation, Metals, Ferritic steels, Fracture, Welding, Approval testing, Stress corrosion, Bibliography, Non-destructive testing, Thermal testing, Porosity, Structures, Tensile testing, Corrosion, Load measurement, Inclusions, Fatigue testing, Leak tests, Aluminium alloys, Structural steels, Welded joints, Components, Joints, Flaws, Cracking
ISBN978 0 580 52086 0
File Size12.57 MB

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