Overview of Creep and Stress Rupture
Creep is the time-dependent deformation of a material under load. It is a generally slow developing form of degradation occurring in metals under stress and higher pressures. The amount of creep deformation that will be experienced is highly dependent upon the level of stress, level of temperature, and material properties of the metal. Deformations caused by creep eventually cause damage that may result in a rupture of the affected equipment components. Commonly susceptible equipment includes nozzles and other components with high tri-axial loading on some catalytic reformers, furnace components, and dissimilar metal welds.
Inspection for creep damage is not straight-forward and may require several techniques to be used in combination. While the use of ring gauges for bulges in furnace tubes is fairly widespread, in other cases, a combination of surface and volumetric NDE may be required, along with metallographic samples (destructive & non-destructive) to verify the presence of creep damage.
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July/August 2019 Inspectioneering JournalBy Rashed Alhajri at Saudi Aramco, Hatim Alhamdan at Saudi Aramco, and Fahad Alhindas at Saudi Aramco
Gasification technology has emerged in oil and gas due to the high combustion energy of Syngas and less environmental concerns than flue gas. This article discusses proper inspection and corrosion monitoring techniques for gasification units.
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This is the second of a two-part column on “Creep.” This second part discusses the approach to creep assessment in plant equipment.
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May/June 2019 Inspectioneering JournalBy Greg Garic at Stress Engineering Services, Inc.
This is the first of a two-part column on “Creep”. It presents an engineering overview of the phenomena, answers the question: “What is Creep?”, and provides readers with foundational knowledge for evaluating and managing remaining equipment...
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API 579-1 is a complex document covering several different types of equipment that may contain flaws or damage. Due to its complexity, this article condenses it into six things you need to know.
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September/October 2017 Inspectioneering JournalBy Arun Sreeranganathan at Stress Engineering Services Inc., and John Norris, P.E. at Stress Engineering Services
Fired heaters are among the most critical equipment in refineries and chemical plants. This article provides an overview of what a fired heater tube mechanical integrity program should include.
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July/August 2016 Inspectioneering JournalBy Mark Geisenhoff at Flint Hills Resources, Jonathan D. Dobis at The Equity Engineering Group, Inc., Phillip E. Prueter at The Equity Engineering Group, Inc., and Dr. Michael S. Cayard at Flint Hills Resources
This article summarizes a recent finite element analysis (FEA)-based study that employs creep simulation techniques to investigate the elevated temperature response of piping with peaked longitudinal weld seams.
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January/February 2015 Inspectioneering JournalBy Pamela Hamblin at Thielsch Engineering, Inc.
Avoiding cracking under pressure when managing high-energy piping systems is common subject matter in the power industry. Just as high-energy piping can give way to pressure, stress and fatigue, so can the people in charge of operating them when...
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January/February 2014 Inspectioneering JournalBy Antonio Seijas at Phillips 66 Company
Fired furnaces in the petrochemical and refining industry are critical pieces of equipment that can have a major impact on process unit safety, reliability, and economics. They are complex pieces of equipment, where tubes and other pressure boundary...
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September/October 2005 Inspectioneering JournalBy John Reynolds at Intertek
Metals will slowly deform under stress and higher temperatures by the mechanism known as creep. The amount of creep deformation that will be experienced is highly dependent upon the level of stress, level of temperature and material properties....
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Laser Profilometry Applied To Catalyst Tubes In Reformers For Ongoing Condition Monitoring of Creep DamageNovember/December 1999 Inspectioneering JournalBy Richard D. Roberts at Quest Integrity Group
Steam reformers are an integral part of ammonia, methanol, hydrogen, and gas process plants around the world. THey are one of the highest cost, both in capital and maintenance, pieces of equipment in the plant. Typically, reformers contain several...
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Reformer catalyst tubes are commonly manufactured from high strength, creep and corrosion resistant alloys. They are relatively thick walled and are usually produced by centrifugal casting. Their lives are limited by creep, driven by a combination...
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