well as environmental conditions, were all examined to understand what impact they would have on weld quality. Milne says: “By completing a full and
thorough schedule of non-destructive and mechanical testing on each weld, we were able to obtain an understanding of the variables which affect the weld quality during water-backed welding. We also identified the specific environmental control measures required to produce an acceptable water-backed weld. By fine tuning the process and the introduction of specific controls for several variables, we were able to conduct successful welding trials which passed all non-destructive and mechanical testing requirements.” This was achieved, she points out, without the introduction of pre-heat and therefore avoiding additional challenges to the process. Using the knowledge gained through
its water-backed welding trials, MTL has now requalified some of its conventional weld procedures in order to align welding consumables and processes with the alternative concept by looking at them in-house at the company’s main operational base in Kintare, Aberdeenshire. These qualifications covered both full penetration butt welds and fillet welds in a range of positions, again without the use of pre-heat. These were witnessed and approved in accordance with an internationally recognised welding standards, and in compliance with several Classification Society rules, MTL states. According to Milne: “By completing the
research and trials in-house, we were able to gain a wealth of specialist knowledge of water-backed welding along with a clear understanding of a range of welding codes. Tis allows us to ensure all of our procedures are tailored specifically to our customer’s project requirements in core business areas.” Practical experience in the field has
already been gained, the company adds. MTL has used the process on in-service FPSOs at three separate locations to support the rectification of hull integrity issues. MTL is a specialist FPSO integrity and
repair management company, providing structural integrity management, on-station FPSO repair, naval architectural and equipment solutions. SR
Shiprepair & Maintenance 4th Quarter 2018
In-house research has generated considerable knowledge about the process
SHIPOWNER VIEWPOINT
Niclas Kappelin, Managing Director, North Sea Tankers, explains the
CLEANING BENEFITS of
“
A well maintained MarineLINE® cargo tank coating, with its very smooth surface, helps NST gain a quick turnaround in port, and provides effective cleaning from the wide range of products that we transport.
To learn more on tank cleaning effi ciency, visit
www.adv.polymer.com ”
Advanced Polymer Coatings Avon, Ohio 44011 U.S.A. +1 440-937-6218 Phone +1 440-937-5046 Fax
www.adv-polymer.com
19
In-depth
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