High-integrity structures standards
This standard is published by BSI in the UK but used worldwide in the design, manufacture, operation and analysis of high-integrity plant and structures, especially in the following industry sectors:
- oil, gas and chemicals
- fossil and renewable energy
- construction and heavy engineering.
Failure/damage mechanisms addressed in BS 7910:2013 include fracture, fatigue, plastic collapse, creep and general corrosion.
BS 7608: 2014 Guide to fatigue design and assessment of steel products
This standard addresses the design and assessment of steel structures, typically in the welded condition, in which fatigue may initiate at stress-concentrating details such as the weld toe. In contrast with BS 7910, which is based on fracture mechanics concepts, BS 7608 assumes that the structure or product is nominally free of flaws.
R6 Assessment of the integrity of structures containing defects, Revision 4
The UK nuclear industry has developed and maintained its own defect assessment procedures (in particular R5 for high-temperature damage and R6 for fracture avoidance) since the 1970s. TWI is a member of the R6 panel, contributing both via an annual programme of research work relevant to the R6 procedures and through participation in committee processes.
API 579-1/ASME FFS-1, 2007 Fitness-for-service
In the USA, API and ASME have developed a fitness-for-service procedure, covering a wide range of failure and damage mechanisms. TWI is a member of the committee, contributing via its North America office.
API 580 and 581 (Risk-based inspection) allow in-service inspection to be better focused by concentrating on areas of plant in which the probability and/or consequences of failure are highest. TWI is represented on this committee.
RCC-M and UK user group
The French AFCEN RCC-M code provides a design basis for nuclear island components. TWI’s involvement with the code includes membership of the committee, and leading a UK user group which provides a communication channel between AFCEN and code users.
PD 5500 and EN 13445
TWI is also a member of various committees and sub-committees charged with the development and maintenance of standards/guidance documents for pressure vessels, both in the UK and at European level.