Five Keys to a Cost-Effective Repair/Modification Package for Tanks-Vessels-Piping

: Process: Does the repair change the process chemistries, physics (fluid phase), and thermo-hydraulics (flow rates, pressures, temperatures)? Does the modification change the control room indications and the operating envelopes? Material: Are the selected metallic materials (base metal and welds) and non-metallic materials (gaskets, packings, etc.) compatible with the existing materials, with the environment, and […]

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Reduced Toughness Properties of Some Modern Carbon Steels Create Brittle Fracture Risk

Changes in steelmaking practice are reported to be causing some carbon steel piping components that are assumed by ASME Codes to behave in a ductile manner at ambient temperatures, to behave instead in a brittle manner.  Barry Messer from Fluor made a presentation on this subject at the Spring 2016 meeting of the ASME B31.3, […]

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Changing Your Crude Slate – Short and Long Term Consequences

There are many reasons why a refinery may want to change their crude slates. However, all of them boil down to economics. Whether a cheaper crude is available or there is a desire to manufacture specific products to increase profitability – money is the driver. However, in deciding to change your crude slate, the long […]

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Fatigue Evaluation of Welded Joints

In welded structures, fatigue failures typically occur at the welded joints. Stress concentrations and small flaws in the welds are key parameters in determining the fatigue life of weldments. Traditionally, fatigue analysis of welded joints has been performed by attempting to determine the peak stress at the welded joint and then entering an appropriate “S-N curve” to estimate […]

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Shaft Fatigue Failures – Part I

Many years ago when I first started my career in a rotating equipment maintenance organization, I was spending the day with a senior metallurgist, which was part of my orientation process as a new technical employee.  He was well known to not have the best “bedside manner” and it was clear he was not thrilled […]

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Shaft Fatigue Failures – Part II

Note:  This blog is a continuation from the previous article from Becht Engineering, “Shaft Fatigue Failures – Part I”.  It is suggested that the reader review “Shaft Fatigue Failures – Part I” before proceeding with this article.  Click Here to view Part I. Before getting into the calculation methods, first a quick refresher on high […]

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Determining “Life” of Bulged Coke Drum

My previous blog on Equipment Health Monitoring (EHM) explains why EHM can be used to improve fatigue life of a coke drums. As explained in this blog, one of the critical locations to be monitored are the circumferential weld seams – where high thermal stresses occur during the operation of the drum. These high stresses over […]

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Materials Technology Institute Polymeric Risk-Based Inspection Pilot Project

Becht was selected by the Materials Technology Institute (MTI) to adapt its Risk-Based Inspection (RBI) methodology to develop an RBI work process for above-ground, fiberglass reinforced polymer (FRP) storage tanks.  The Becht RBI methodology, which complies with API RP 580, was initially used for metallic fixed equipment and has been expanded to other types of […]

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Elevated Temperature Reactor Component Design and Qualification

  Becht Engineering, Nuclear Services Division, has completed a finite-element numerical study of two proposed Code Cases for ASME III Division 1 Subsection NH, Class 1 Components in Elevated Temperature Service.  They are: “Satisfaction of Strain limits for Class 1 Components at Elevated Temperature Service Using Elastic-Perfectly Plastic Analysis” and “Calculation of Creep-Fatigue for Class […]

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NonMetallic Composite Wrap Pipe Repair

Nonmetallic composite wrap repairs are wraps comprising two constituents: A fabric woven from a fiber such as graphite or glass A thermoset polymer such as a two-component mix epoxy resin. This material is also referred to as fiber-reinforced polymer (FRP). These repairs can be liners wrapped inside, or jackets wrapped over a corroded pipe. There […]

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