CFD Modeling Of Mixing Tees – Design Of A Thermal Sleeve

Published in Hydrocarbon Processing, August 2020 hydrocarbonprocessing.com/magazine by Dave Dewees, Zumao Chen,  Magnus Gustafsson Mixing tees – in which two fluid streams with different physical and/or chemical properties mix – are widely used in the petrocemcial industry. When there is a large temperature difference between two streams, large metal temperature fluctuations can occur in the […]

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Practical HTHA Experience And Timebased Nelson Curves For Improved Equipment Life Management

Recently, Becht published an article in Inspectioneering Journal regarding High Temperature Hydrogen Attack. This article was written by: DAVE DEWEES, PE, Mechanical Engineering Division Manager GERRIT BUCHHEIM, PE, Refining Metallurgical and Corrosion Expert & Pono Division Manager JEREMY STAATS, PE, Refining Corrosion and Materials Engineer CHARLES BECHT V, PE, Vice President of Engineering   Abstract […]

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CFD Modeling of a Mixing Tee – Part 1: Model Validation

by Dave Dewees, Zumao Chen and L. Magnus Gustafsson This 2-part blog deals with CFD modeling of a mixing tee that is often found in industry. Traditional simulation is validated against experiment, as well as a new commercially available method that offers the possibility of substantial solution time reduction.  In fact, the new method is shown […]

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CFD Modeling of a Mixing Tee – Part 2: Predictions of Temperature Fluctuations

by Dave Dewees, Zumao Chen and L. Magnus Gustafsson Miss Part 1? Click Here This is the second part of a 2-part blog.  In Part 1, the stress-blended eddy simulation (SBES) and large eddy simulation (LES) approaches for simulating turbulence have been validated against test data obtained from a mixing tee. In this part, the […]

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Grade 91 Steel – How Did We Get Here? Part 1

This blog is the first part of a 3-blog series. To view the rest of the story click HERE for Part 2 and Here for Part 3. Part 1: History Thirty years ago, Grade 91 (9Cr-1Mo-V) steel was hailed as the savior of the power generation industry [1]; now it’s behavior has been described as […]

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Grade 91 Steel – How Did We Get Here? Part 2

Read Part 1 Part 2: Type IV Cracking and Inspectability The current concerns with Grade 91 are fundamentally and firmly rooted in inspectability of Type IV damage; while sensitivity of the material can be managed (see for example [1]), Type IV cracking is perhaps the Achilles heel of Grade 91.  At a high level, the […]

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Grade 91 Steel – How Did We Get Here? Part 3

Read Part 1 or Read Part 2 Part 3: Allowable Stresses While inspectability has been at the center of recent concerns, other issues such as chemistry control, ductility and excessive oxidation have also come under scrutiny.  Perhaps most interesting is that while all of the preceding concerns have been debated, it has also been found […]

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