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;
London Branch News – MAR 18 – Technology Advancements in Integrity Management of Storage Tanks
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
For copy of the Newsletter please click below:
London Branch News – FEB17 – The use of EIS
The Welding institute meeting on Materials, Welding and Integrity issues in Offshore Wind
ICorr members are invited to attend a meeting on the theme of Offshore Wind Energy structures and their issues of materials, welding and integrity and will be held at TWI, Granta Park, Cambridge CB21 6AL on Thursday 15th March.
The line up of speakers, including:
Ben Wysome, Head of Department, Offshore Wind team, Ramboll UK,
Mons Hauge, Chief Engineer Materials Technology, Statoil
Dr Stephan Brauser, Mannesmann and Dr Andreas Pittner, Federal Institute for Materials Research, Germany
Professor Michael Havro-Faber, Aalborg Universitet, Denmark
Professor Feargal Brennan, Cranfield University
Steve Marson, James Fisher Testing Services
Alan Denney, AKD Materials Consulting Ltd.
For full details of the meeting please access this link;
For Enrolment to the event, please click link below;
For Copy of the flyer please click link below;
Wind Energy – Challenges in integrity management r
The second presentation of the 17/18 season was a joint meeting with TWI, and James Hesketh of the National Physical Laboratory gave a presentation on the Influence of H2S on the Pit to Crack Transition in Sour Testing of Corrosion Resistant Alloys.
James Hesketh received a vote of thanks from Stephen Shapcott of TWI on an excellent presentation and received gifts from both TWI and ICorr.
James highlighted that stable pitting is a precursor to sulphide stress corrosion cracking (SSCC), which is one of the main causes of failure of stainless steel pipelines used in sour Oil and Gas production. Despite this, the underlying mechanism governing the growth of such pits is poorly understood, and hence materials selection for sour service is dependent upon costly and time consuming environmental exposure and SSCC test programmes.
In the study at NPL, the role of hydrogen sulphide (H2S) in pit propagation was investigated as a first step towards the development of accelerated test methods for SSCC resistance. Novel electrochemical techniques were employed to determine the relationship between bulk solution chemistry and the critical pit chemistry required to induce stable pitting in sour environments. James stressed that electrochemical measurements are correlated with results obtained from standard SSCC tests and are rationalised in terms of the balance between H2S diffusion through the pit mouth, H2S consumption within the pit and the role of the external cathode.
He also explained that there was a systematic decrease in pit size with increasing H2S concentration. Also that a greater peak current was measured at higher H2S concentrations and repassivation was slower.
The 29th London Branch Lunch, held at The Royal Overseas League in early December, was another huge success with 177 people attending the event in Mayfair London.
Guests started to arrive at 11.30 for a pre-lunch drink and were seated by 12.30 for the first of two acts by The Sirens a group of three singing performers, which was really well received and set the scene for the afternoon. The meal was yet again excellent and congratulations to the ROSL who never disappoint. After the lunch the Chair of London Branch thanked the luncheon organising committee ad the branch committee, who continue to drive the Institute in London forward.
The President then addressed the guests to a rapturous applause once again thanking everyone for their support and explaining that the Institute has exciting plans that will start in Q1 2018.
From left – right, Sarah Vasey, Chris Bridge Simon Bowcock, Trevor Osborne, Charlotte Vie, David Mobbs and Bill Hedges.
After the raffle, two guests were honoured with a small gift in recognition of them receiving the Tallow Chandlers Award for their work in materials and corrosion, a tremendous achievement by Charlotte Vie in 2016 and Simon Bowcock in 2017.
The timing for the event this year was slightly different allowing guests to socialise and network at the ROSL until 7.00pm which appeared to be extremely popular with lots of notes being taken and exchanging of business cards.
Thanks go again to all those that assisted in the organisation of the event and we look forward to another exciting event in December 2018. Hamed Habibi, Technical Director of Speir Hunter Ltd, gave an interesting presentation entitled “Developments in Remote Magnetic Monitoring of stress in ferromagnetic Pipeline” at the January meeting.
The talk introduced and explained the benefits of stress monitoring in pipeline integrity management. It is the only inspection technique that can simultaneously map the lateral position and depth of cover of a pipeline whilst providing comprehensive defect detection. Several case studies were discussed to illustrate the advantages of this the technique, also known as Stress Concentration Tomography, over traditional inspection methods. The technique is able to assess condition of buried pipelines remotely and is not dependent on the type of defect, size of pipe, construction configuration or operating condition, and can save a considerable amount of time, effort and budget while providing an accurate 3 dimensional mapping of a pipe and surrounding objects. The technique can also identify location of casings and wrinkle bends, information becoming required by the regulatory authorities.
John Lilley and Mark Stone
The industry is well versed with Corrosion mapping of vessels and pipework but Corrosion Mapping of Storage Tanks has always relied on “dropping the tank” which has an impact on production and risk. 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.
Storage Tanks are susceptible to a range of internal and external corrosion processes. As such 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. Internal inspection for other mechanisms also takes place at this time. This means tanks can be out of service for significant periods of time.
Sonomatic have developed a range of methods for inspection of Storage Tanks while in-service. A key element is robotic cleaning and inspection of the floor. This forms part of a comprehensive inspection in which the tank shell is also inspected non-intrusively using ultrasonic corrosion mapping supported by statistical analysis. The presentation will give an overview of the technologies involved, how these link into more efficient integrity management of Storage Tanks and will also include a case study of field application.
A fascinating not to be missed presentation
Date: 8th March
Venue: Imperial College, Skempton Building, London SW7 2BB
18.00 Doors Open – Networking
18:30 Presentation – Sonomatic Ltd
20.00 Buffet & Refreshments – Networking
For further information please contact
ICorr – London Meeting – 8th March 2018 msrev
By:Hamed Habibi – Speir Hunter Limited
This presentation introduced and explain the benefits of Stress Monitoring in Pipeline Integrity Management. The technique is the only inspection technique that can simultaneously map the lateral position and depth of cover of the pipeline whilst also providing comprehensive defect detection. Moreover, it provides additional deliverables that anticipate the increasing demand of pipeline regulatory authorities such as the location of casings and wrinkle bends.
Hamed talked the audience through the benefits of using this method which is developing to be known as silver bullet of pipeline integrity as it is the only method of measuring stress in pipeline wall. He explained the physical principles of the method that is also capable of measuring the depth of cover, lateral position and detecting welded joints. Specifications of this innovative method was detailed in terms of achieved performance in field trials which took loads of interests among audience. Loads of case studies were explained by the speaker to display the advantages of this the technique over traditional inspection methods in special cases. The technique which also is named Stress Concentration Tomography is able to assess condition of buried pipelines remotely without any dependency to a specific type of defect, manufacturing size, construction configuration or operating condition that will save a considerable amount of time, effort and budget while it will also provide an accurate 3-dimensional mapping of pipe and surrounding objects.”
For full article of the newsletter please click link below;
London Branch News – JAN17 – Remote Monitoring and YEP.docx