November meeting was a joint meeting with the Institute AGM, and was held at the Council Chambers in Birmingham. As with previous joint Midland Branch / ICorr AGM meetings it was very well attended with approx. 50 attendees, although adverse weather affected rail travel and prevented a number of members attending. The theme of the meeting was pipeline integrity, with presentations from Malcolm Morris of Sherwin Williams, Leo Richards of Intertek, and Kristian Hampson of IMechE. Malcolm provided a detailed review of the coating systems commonly used on pipeline systems, typical application techniques together with examples of common rehabilitation methods, which for buried long pipelines can be very costly and challenging. Leo delivered a presentation on pipeline integrity and the importance of chemical treatment during pre-commissioning of a new pipeline system and its long term operation and provided case studies from each stage in the process, together with the simulation systems available and examples of typical problems when the process was not applied or applied incorrectly. Kristian gave a very thorough review of non-destructive-testing methods for corrosion under insulation on pipework, with many examples of what not to do, and photographs of some rather horrible corrosion examples. He also explained that CUI is a wide-spread problem accounting for over 50% of oil and gas pipeline leaks
in the industry (see technical article on this topic later in this issue).
The chair thanked all the speakers for their very informative presentations, and following this there was the presentation of the U.R. Evans award, and the AGM, which are reported on page 5.
The January talk by Dr Patricia Conder, Sonomatic Ltd, was on “Pipework Corrosion: Prediction and Reality”, and how differences in the spatial pattern of internal pipework corrosion, be it patchy or more uniform, impacts on the effectiveness of inspection, and how this can be used to improve understanding of the underlying corrosion behaviour. Patricia discussed how extensive corrosion is easy to find and measure, but in instances where wall loss occurs more randomly, the challenges of matching inspection strategy to the corrosion coverage increase. She discussed how thinking of inspection of as a statistical sampling process helps both inspection strategy and analysis. The audience were challenged to spot the difference between a corroding and non-corroding circuit
within a second. This was successfully achieved by
means of a graphical overview of the whole circuit inspection history.
This overview presented a route to mine into the data, to examine “groupings” based on corrosion mechanisms, for example testing to see if the bends really are corroding faster than the straights. She also discussed the use of integrity driven corrosion rates, based on how the overall wall loss of the circuit is changing, rather than focussing on per inspection location corrosion rates, which can exaggerate measurement variability. Although historically inspection has been based on manual ultrasonic thickness measurements and radiography, these techniques have only covered relatively small areas overall. Developments for pipework inspection offer everything from screening to more detailed high accuracy mapping. The challenges being to incorporate all these results into a database in a meaningful way to get added value from a change in inspection approach. Patricia finished the talk by reminding us to think corrosion: think spatial.
Miller Fabrications of Wishaw, Scotland, a Gold Sustaining Member, design, fabricate and install structural steel, architectural metalwork and secondary steelwork to the UK construction and rail sectors. Their 12 acre production plant includes an in-house shot-blast and paint facility.
For more information, see www.millerfabrications.com
The branch was very pleased to welcome retiring ICorr President Sarah Vasey on her farewell tour, to the committee Christmas dinner, which was held at the beginning of December. Sarah has taken a great interest in the work of the branch, as with other UK Branches that she has helped to develop during her Presidency.
L to R: Dr. Muhammad Ejaz, Amir Attarchi, Hooman Takhtechian, Dr. Nigel Owen, Sarah Vasey, Dr. Yunnan Gao, Zahra Lotfi, Bryn Roberts and Stephen Tate of the Aberdeen Branch Committee.
At the November joint meeting with IOM3, Dr Ed Wade gave a presentation to an audience of over 50, on the subject of “Downhole Metallurgy and Corrosion – from the first pipe, to current challenges”, which proved a fascinating insight into the topic that had everyone glued to their seats.
Dr Wade originally trained as a metallurgist and his interest in downhole metallurgy developed during 13 years spent with Marathon Oil in Aberdeen and subsequently as an independent consultant. Since 2004, he has delivered more than 40 training courses focussed on the selection of corrosion resistant alloys for downhole applications, including ‘open’ courses promoted in Aberdeen by the Mining Institute of Scotland (a local affiliate society of IOM3).
Starting with the first use of downhole pipe, the talk progressed through subsequent developments that have remained central to current practice; recent novel HP/HT challenges were also outlined, before closing with an overview of future very challenging downhole requirements for Geothermal Energy and Carbon Storage, such as United Downs Deep Power Project in Cornwall, that will require many thousands of new deep / high performance wells to be drilled and operated under highly corrosive conditions.
It was a fascinating tour through 159 years of metallurgical advancement of tubular goods, commencing with the Drake Well in 1859, (that went on to operate for another 40 years), through to the development of modern API Specs and Coding Systems, trends and advances in North Sea CRA use for tubulars, together with an explanation of how corrosion mechanisms such as Ringworm have been eliminated through improved heat treatments.
The difficulties in adequately simulating and testing for all downhole situations was highlighted along with the sometimes intermittent, and sometimes unplanned operational practices of the Oil and Gas and other Industries, which place huge demands/expectations on material performance in sometimes rapidly changing conditions.
The need for materials to withstand highly corrosive sub-surface gases at very high partial pressures for extended periods, and the difficulties of successfully implementing preventative chemical treatments at immense depth were clearly explained.
It was also evident that composites have still yet to make huge in-roads into the market place f0r downhole use and to successfully compete with the available wide range of corrosion resistant metallics. The main problem here seems to be industry confidence in non-metallics, as being relatively new, difficult to manufacture, and not having well established test protocols for downhole scenarios.
The event generated many questions from the audience that were very well responded to by this distinguished speaker.
The branch 2018/19 session continues on 26 February, with a special coatings technical event. Ajith Varghese of International Paint will talk on ‘A Novel Approach to Combatting CUI’ and Michael Baraky (RMB Products) and Rob Mackie (United Pipeline Systems), will discuss ‘MIC-Resistant HDPE Linings for Seawater Applications’.
Branch Chair Dr. Yunnan Gao presents a Certificate of Appreciation to Presenter Dr Ed Wade of Metal Ecosse after the Event.
Dr Ed Wade’s paper can be found on: https://drive.google.com/file/d/1N2CqylMutsUOjAj5ixPsFeHoRsr1gL1p/view?usp=drive_web and all past Aberdeen ICorr Presentations can be found on: https://sites.google.com/site/icorrabz/resource-center
Full details of future events can be found on the diary page
of the magazine and on the website, or contact: ICorrABZ@gmail.com
Equilibrant Ltd is a Belfast based independent Civil and Structural engineering consultancy established in 2009, and specialising in the detailed inspection, Non-Destructive Testing and repair & protection of reinforced concrete and steel infrastructure. The Managing Director, Dr Jim Cromie, is a Chartered Engineer and has a PhD in the electrochemical de-salination of reinforced concrete, and the Technical Director, Robert Devenney, is a Chartered Engineer with a wealth of experience in the inspection, testing and repair of all types of infrastructure.
They work with Asset Managers, consultants and contractors, producing comprehensive reports with recommendations for Life Cycle Management of civil infrastructure and can accurately identify the cause, extent and significance of structural/electrochemical deterioration using specialist Non-Destructive Testing techniques, and propose remedial works strategies, considering whole life costing, to ensure clients schedule sustainable remedial interventions. They have a full range of NDT equipment in-house including half-cell potential units/linear polarisation devices/concrete resistivity meters, Proceq live ground penetrating radar unit, Schmidt hammers etc.
All types of structural infrastructure and across engineering disciplines from railway and motorway bridges, other highway infrastructure, marine structures, high rise buildings etc. have been assessed. Typically the structures are suffering from Biogenic Sulphate Corrosion, concrete carbonation + low cover to reinforcement, chloride contamination, sulphate attack, acid attack, cracking etc. They also have the in-house expertise to model chloride diffusion and rate of carbonation penetration.
They are completely materials independent and produce factual reports or interpretive reports with repair material performance specification in accordance with EN 1504.
Equilibrant Ltd also offer a Part 3 HSE Surface Supplied Commercial diver, one of, if not the only practising chartered engineer dive inspection service in Ireland.