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Welcome to FESI


FESI - the UK Forum for Engineering Structural Integrity:
Working to assure the reliability, safety and economic viability of engineered systems, structures and components from design to end-of-life, and to reduce undesirable environmental impact.


FESI is the membership organisation for engineering structural integrity (ESI) in the UK. FESI disseminates the latest advances in ESI, promotes the exchange of ESI technologies and knowledge between industrial, regulatory, academic and professional organisations, encourages best practice in ESI, and provides a practical resource for anyone working in ESI. FESI aims to help improve the safe performance of and realise the economic potential inherent in the UK's engineering assets.

This is achieved through the organisation of CPD events, and the publication of a biannual journal, The FESI Bulletin, and textbooks through our wholly-owned subsidiary, EMAS publishing.

Increasingly, organisations are waking up to the fact that ESI's cross-industry, multi-disciplinary technologies, methodologies and practices underpin the success and safety of their current and future operations, although they may not, in the past, have regarded themselves as possessing an engineering component.

Sectors which recognise that ESI and the associated best practice makes a positive contribution to their survival range from the health, medical and healthcare industries, through architecture, construction, manufacturing, all branches of engineering and transport, to the renewable power generation, petrochemical, nuclear, and aerospace industries.

FESI's role as the UK's authority on ESI is supported and endorsed by a number of eminent and progressive organisations drawn from such sectors. These valued Sponsors acknowledge that the integration of ESI into their corporate policies has shown benefits for their development, operational safety, efficiency and sustainability. Sponsoring FESI is a way of helping to spread the positive message about ESI.

FESI is steered by a Council of distinguished ESI experts and specialists. See Who's Who in FESI.

Join FESI or renew your membership here.



FESI & EMAS Publishing
are on the move!

With effect from 8 June 2015, our new address is:

FESI - UK Forum for Engineering Structural Integrity
Suite 201
Birchwood Park
401 Faraday Street

Tel: 0044 (0)1925 377694
Alt Tel: 0044 (0)1925 377695
Our email addresses remains the same: fesi@fesi.org.uk




June 20-24, 2016

Catania, Italy

Papers submission deadline: 20/04/2016

Hotel reservation deadline: March 25, 2016 It is warmly adviced to respect this deadline. In summer, the venue is characterized by an important touristic activity. After this deadline, hotel rooms will not be guaranteed. ESIS Summer School (Catania, June 19-20, 2016).

Registration is always open via the "Fees payment" section in the ECF21 website.

ECF21/Summer School Early bird registration: 20.04.2016



Strain Based Fracture Assessment – 1 day workshop

25 th February 2016

Conference centre, TWI, Cambridge, UK

Download Revised Programme

Engineering Critical Assessment (ECA) procedures such as those of BS 7910 “Guide to Methods for Assessing the Acceptability of Flaws in Metallic Structures” and R6 are now well established for assessing the fitness for purpose of Engineering components.

For assessing the significance of girth weld flaws in pipelines under elastic loading, BS7910 is generally adopted. Subsea pipelines may, however, be subject to significant axial plastic straining during installation (e.g. by reeling) and/or during operation, e.g. due to lateral buckling, where the pipeline may experience biaxial loading. Land pipelines may experience axial plastic straining combined with internal pressure for example due to frost heave or seismic ground movement. The Technical Advisory Group on Structural Integrity of Nuclear Plant (TAGSI) has also recently considered the use of R6 for high strain applications. Even when stresses are limited by design codes for pressurised applications, certain welded configurations may experience high strains.

Substantial research has been carried out over the past 15 years to develop improved design tools for such pipelines and pressurised applications including, in particular, ECA methods for assessing the significance of girth weld flaws under longitudinal tensile plastic straining. Some of these projects focussed on onshore pipelines and led to detailed methods for estimating tensile strain capacity (maximum tensile strain that can be sustained for a given combination of a girth weld flaw and pipe geometry, tensile and fracture toughness properties, and pipeline loading). Other projects led to the development of ECA methods for ductile tearing assessment of girth weld flaws in subsea pipelines, which experience plastic straining during installation. All these methods were developed and validated based on results from finite element analysis (FEA) and/or test data.

However, the approaches adopted to develop some of these methods have varied significantly with regard to the derivation and/or expression of: the crack driving force; scope and implementation of relevant failure criteria; characterisation of fracture toughness; and scope of validation against numerical and/or test data. Given these differences, the application of these methods could potentially lead to a wide range of results, as has been demonstrated in limited published comparisons. This situation together with the lack of industry consensus and absence of well-established codified guidance is clearly unsatisfactory, as it can create significant uncertainties with regard to the practical use of these methods.

In order to address issues like these for companies who are considering engineering applications under severe conditions, FESI will be holding a one-day workshop. Delegates will be invited to participate in a discussion to identify challenges and express their view on the methods to ensure high integrity in safety-critical structures operating in harsh environments. At the end of the workshop FESI would summarise the gaps in knowledge and possible ways that these could be addressed.

Who Should Attend
Engineers and Scientists involved in the repair and maintenance of plant and pipelines. That should include designers and safety case authors who evaluate the results, operational staff, in-service-inspection staff and the maintenance staff. The output from this workshop will be circulated to attendees, published in the FESI Bulletin and posted on our website at www.fesi.org.uk . All attendees will receive a CFD Certificate of Attendance.


TAGSI/FESI Symposium 2016 – Materials & Methodology for Future Nuclear Power Plant

26-27 April 2016

Conference centre, TWI, Cambridge, UK

Download Flyer

The 2016 TAGSI/FESI Symposium - Materials and Methodology Challenges for Future Nuclear Power Plant -draws on the work of TAGSI undertaken on behalf of its Sponsors for the exis ng range of UK nuclear power genera on systems. The Symposium will focus on the materials and structural integrity challenges facing the introduc on of new nuclear plant in the UK while also addressing life extension for the exis ng plant, which is needed to operate while new nuclear build is progressed. In addi on the current status of codes and methodologies and the developments required to meet the iden fied materials and structural integrity challenges will be explored. Discussion Sessions in the Symposium will focus on the extent to which the challenges are being met and what needs to be done to underpin new plant for long term opera on. These are ques ons that FESI members consider important in the continuing development of engineering structural integrity best practice across industry.





The FESI Bulletin

OUT NOW: Vol.9 Issues 1 & 2

Download a copy of the current issue here

Download the FESI Bulletin UK

Inside this issue:


  • News & Announcements
  • Big Data, Industry 4.0 and Engineering Structural Integrity
    Norman Swindells
  • EMAS Publishing
  • Reports from FESI’s Workshops & Seminars
    -Recent Advances in R6 Fracture Research
    -Structural Integrity: The Role of Inspection and Assessment Methodologies
    -ESIA13 – Report from the closing panel discussion
  • Obituaries
  • One That Got Away: “Sound as a Bell” John Knott
  • Papers from ESIA13
    -Understanding the Mechanical Behaviour of Gilsocarbon Graphite over Multiple Length-Scales D Liu et al
    -Structural Integrity Assessment of Offshore Wind Turbine Foundations under Slippage of the Grouted Joint R Kennedy et al
    -On-line Structural Damage Feature Extraction based on Autoregressive Statistical Pattern of Time Series M-H Hu et al
  • The What’s On Events Listing