51320-ALL-Summer 2020 Digital Proceedings Papers

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Product Number: 51320-ALL-SG

Publication Date: 2020

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Important Factors in Pipe Butt Welding of Super Duplex Stainless Steel (SDSS) UNS S32760 Using the GTAW Welding Process

Product Number: MPWT19-14287

Author: Dr. Glenn Byrne

Publication Date: 2019

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The paper considers best practice to realise the optimum combination of strength, toughness,
corrosion resistance and radiographic integrity in UNS S32760 pipe girth welds made using the
GTAW process.
Aspects of fit up, tacking, root gap are considered. The effect of weld heat input and heat input
control through the thickness of the joint, welding technique, inter pass temperature control and
the use of different combinations of shielding and backing gasses on corrosion resistance of
joints is presented. Current specification, procedure and welder qualification requirements are
discussed, as is the need for supplementary testing, in particular quantitative microstructural
evaluation.

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Upstream Assets Integrity Management

Product Number: MPWT19-15264

Author: H. Seshadhri Srinivasan

Publication Date: 2019

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Upstream oil production assets, including oil production pipeline network and gas oil water separation facilities, play a dominant role in sustaining production targets to meet customer requirements. Corrosion management of such assets encompasses various phases, such as design, construction, operation, and decommissioning. Proper engineering design and sound construction practices combined with effective monitoring are essential to manage and maintain the corrosion of these assets within acceptable limits. Some of the considerations taken into account during design include: safety, environment, pressure, temperature, material availability, delivery time, and cost. Operating these assets outside of the design boundaries could influence the corrosion process, significantly impacting integrity. Close monitoring of operating parameters, along with identifying the corrosion by employing appropriate inspection techniques, and implementing timely corrective measures, are of paramount importance to preserving the integrity of these critical assets, which otherwise could lead to safety and environmental issues. This paper highlights three case studies involving the importance of cathodic protection monitoring, and failure analysis of an oil pipeline, along with corrosion inhibitor optimization efforts carried out to ensure asset integrity.

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Advanced Functional Testing for Non-Metallics in HPHT Conditions

Product Number: MPWT19-14451

Author: Rod Martin

Publication Date: 2019

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As the service conditions for non-metallics becomes ever more challenging, their reliability and fitness for service evaluation requires more refined levels of testing. For elastomers used in HPHT sour conditions, the need to evaluate their ability to continue to seal requires testing that closer represents them as an elastomer seal and not as an elastomer material. This paper discusses new methods to test new techniques for the use of sour gas to conduct rapid decompression testing and new functional testing techniques to measure their ability to seal. The increased use of composite materials in more aggressive service has required new evaluation approaches to be developed and new standards written to match. This paper also discusses these new test methods for testing at a material and a pipe level within these standards.