After due consideration of the nominations for the CED 2018 Paul McIntyre award, the selection panel has agreed to give this year’s award to Dr. John Broomfield. He will be attending the next CED working day to receive the award
Function – Related Dosage of Corrosion Inhibitors The Development of an on-site Operator Deployable Technology
The February event focused on internal corrosion management Issues, particularly corrosion mitigation by chemical control and optimization. A very enjoyable and informative presentation was given by Emma Perfect, CEO of LUX Assure Ltd, who described the development of an onsite technique for measuring dosage of corrosion inhibitors used in the protection of pipelines. This advanced technique was developed as there was a perceived need to identify more quickly, and more accurately, when dosing levels of inhibitor were either below or above the threshold for protection, and hence allow an operator to adjust levels to better protect equipment from corrosion or have options to lower the dosage level to reduce costs of inhibitor supply.
A well supported event at Palm Court Hotel
Development of the LUX Assure Control Concept commenced in 2008 and the company has been supported by key energy industry players including Chevron, ConocoPhillips and Statoil Technology Ventures, along with the Scottish Investment Bank and Archangels / Private Investors. The technique relies on the fact that corrosion inhibitors form micelles in the body of the fluid once all available sites for absorption are occupied. This is essentially a saturation point, and the micelles formed increase in concentration as inhibitor is supplied in excess of optimal levels.
With access provided to suitable trial sites, the development of the technique and a suitable kit for onsite monitoring progressed over a period of 3-4 years until it was fully commercialized in 2013. LUX Assure gathered data to show operators that this technique could be used to test fluids and identify the Critical Micelle Concentration (CMC) of a surfactant above which micelle formation occurs. But the real challenge for LUX Assure was to develop a kit, (now known as CoMic TM) which operators offshore could use to sample and analyse fluids in the field in relatively uncontrolled environments without precise preparation. The specialised kit includes detection reagents and an optical analyser. Final data processing evaluation of the sample is still currently performed back at the offsite laboratory and results and advice swiftly communicated back to the field, but a full onsite service is currently being progressed
The presentation, which was well received, went on to describe case studies and discuss when samples may not be suitable for testing, and also the correct use and interpretation of the data for the test situation. It is hoped that in the near future that all data interpretation can be made by the test operator if a practical and proven site assurance system can be developed.
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A helpful starter for anyone in the corrosion industry, Basic Corrosion covers the causes of corrosion as well as how to identify , monitor, and control it. By completing this course, show employers you have a strong understanding of the basics, and take the first step in working towards becoming NACE certified.
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Mark Stone delivered a fascinating presentation on the advancements of Storage Tank Integrity. It’s of particular interest to David Mobbs having been a career objective to establish a mechanism for detecting metal loss on the base plates of tanks without the need to “drop the tank”. The industry is well versed with Non-intrusive inspection of vessels and pipework, but Corrosion Mapping of Storage Tanks has always relied on man entry and physical base plate inspection. The industry does not like working in confined spaces and there are moves towards zero-man entry over the lifetime of storage and process vessels.
Mark Stone explained that Storage Tank inspection plays a major role in effective integrity management of Storage Tanks. Historically, inspection of the floor has relied on emptying the tank and personnel entry for cleaning and inspection and that the common method of using MFL is not necessarily the most effective method of determining metal loss.
Sonomatic have developed a range of methods for inspection of Storage Tanks while in-service. This includes the use of traditional shell wall inspection using crawlers coupled with new technology to determine metal loss in the first meter of the tank using multi skip technology deployed around the outer chime of the tank.
The key element of the program is however the use of a robotic cleaning and inspection of the floor. The tool dropped through the tank fluids to the floor and remotely guided by use of sonar. The first part of the program is to understand the level of sludge which is completed by the sonar that is strategically placed around the base of the tank. The tool is then able to remove the sludge and scan the base plates, results are transmitted to a mobile unit outside where the program is supported by statistical analysis. The presentation included a case study of a field application and the detail can be seen on the LB page of the website
There was a good level of discussion around the floor and it was the view of David Mobbs that this process real value is in an “iterative process” where a tank farm operator would screen all the tanks and identify which was detected as the worst. On opening the tank and carrying out full base plate inspection its possible to check the model to see how accurate it is. By the time the 3rd tank is completed its full inspection the model is going to be pretty accurate. For Copy of the Newsletter please click below;
The second presentation of The Young Engineers Program (YEP) also at CB&I in London with an excellent presentation on the complexity of Welding & Cutting followed by Non-Destructive Testing. The program continues through the year with 9 modules including a Case Study which the delegates will complete with the help of mentors.
The discussion was all encompassing but dealt with the basics of;
- The basics
- The common arc welding processes
o Manual welding with covered electrodes; SMAW (MMA)
o Submerged arc welding; SAW
o Gas shielded welding; GMAW, (MIG / MAG)
o Flux-cord arc welding; FCAW, SS-FCAW
o Gas shielded welding with non-consumed electrode; GTAW (TIG)
- Choice of welding processes
o Oxy-fuel cutting
o Air-arc gouging
The lecture continued Non-destructive testing where the scope was;
- Magnetic Particle Inspection
- Liquid Penetrant Inspection
- Manual Ultrasonic Testing
- It did not cover visual inspection which is the most common inspection method
The group enjoyed a networking session after the meeting at a local Lebanese restaurant courtesy of The Institute of Corrosion.
The next YEP meeting will be Materials and Materials Selection to be presented by Sadegh Parvizi on Wednesday 21st March at CB&I in London.
We are extremely grateful to Alan Denney and Sadegh Parvizi at CB&I and all the other members of ICorr that give up their time freely to assist our Young Engineers with their career development
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The Use of EIS as a Predictive Tool for Coating Lifetime By; Dustin Traylor, MSE – Axalta Global Product Manager and Dr. Stephen Drew – Axalta EMEA Coatings Leader
The presentation given by Dustin was excellent, raising a significant discussion amongst those attending. Dustin’s idea was to raise awareness of new predictive modelling techniques for coating life and performance. A new generation of high temperature coatings, such as high glass transition temperature Fusion Bonded Epoxy (with Tg 205°C), are being developed as a lower cost alternative to expensive alloy steels. However, the highly-functional epoxy resin and ingredients in these new coatings can make interpretation of testing results difficult for coating specifiers. Dustin Traylor, MSE and Dr. Stephen Drew of Axalta Coating Systems explore the benefits of using Electrochemical Impedance Spectroscopy (EIS) after atmospheric testing to assess a coating’s life expectancy. This technique has now been adopted by Aramco and Chevron and is gaining credibility as a useful tool in the pipeline market.
The conclusion was that EIS did have a part to play in conjunction with accelerated weathering; Autoclave and Atlas Cell to assist with the determination of expected coating life.
To verify the laboratory work to date, the Axalta team needs field data on aged coatings to establish if this is an appropriate standard for testing of coatings
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