Becht Engineering Blog

In this section of the site contributing authors submit interesting articles relating to the various services, industries and research & development efforts of Becht Engineering.
Becht Engineering performs considerable consulting engagements in the Pressure Vessel design and trouble shooting.

ASME Section VIII, Division 1 - 2019 Edition - Changes to U-2(g)

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What Do You Do When There Are No Rules? On July 1, 2019, the 2019 Edition of ASME Section VIII, Division 1 will be published.  Among the 117 changes to this Edition will be a revised paragraph U-2(g), and a new Mandatory Appendix 46.  The new U-2(g) will read: (g) This Division of Section VIII does not contain rules to cover all details of construction. Where complete details of construction are not given, the Manufacturer, subject to the acceptance of the Authorized Inspector, shall provide the appropriate details to be used.    (1) Where design rules do not exist in this Division, one of the following three methods shall be used:       (-a) Mandatory Appendix 46;       (-b) Proof test in accordance with UG-101;       (-c) Other recognized and generally accepted methods, such as those found in other ASME/EN/ISO/National/Industry Standards or Codes. This option shall provide details of design consistent with...
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Basics of Design By Analysis in ASME Section VIII, Division 2

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How hard can it be?  I’ve heard from several (unnamed) analysts that because they have access to an FEA program and have successfully applied FEA in other fields, that FEA for pressure vessels should be a snap.  What is it about FEA for pressure vessels that makes it unique? I was recently discussing with another blogger regarding some distinctive aspects of performing Design By Analysis for pressure vessels.  We generated several questions, and so I decided to post this in a Question & Answer format. When do I have to use FEA in my pressure vessel design? The short answer here is that for most situations, you probably should not be using FEA to design your pressure vessel.  The rules for designing pressure vessels in ASME Section VIII, Division 1 and ASME Section VIII, Division 2 have a long history of successful application.  So, wherever possible, I would recommend that you...
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Five Keys to a Cost-Effective Repair/Modification Package for Tanks-Vessels-Piping

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: 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 with the service, for the design life of the repair? Is the material compliant with (a) the material specification (ASTM or ASME II), (b) the supplementary Code requirements, and (c) the supplementary plant-specific requirements? Will the material be procured from an approved supplier; does it require supplementary Quality Controls? ASME Code design : Does the modification alter the system layout? If yes, has the layout been checked for good practice and consistency with the process design (item 1 above)? Are the loads and load combinations well defined and categorized as Service Levels A, B,...
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Repair of Pressure Equipment and Piping in Nuclear Power Plants- Navigating ASME XI Repairs with PCC-2 as a Roadmap

Repair of Pressure Equipment and Piping in Nuclear Power Plants-
Navigating ASME XI Repairs with PCC-2 as a Roadmap
Download/View as PDF Summary - This article assists engineers in selecting ASME XI options for the repair of ASME III nuclear components. In summary, the repair options in ASME XI are dispersed throughout Section XI and Code Cases, while, in contrast, the ASME PCC-2 repair standard (for non-safety related components) lists repair options in a well-structured manner. So, we are going to use the structure of ASME PCC-2 as a road map to cross-correlate the equivalent ASME XI repair, where it exists. Therefore, the Table can be used as a checklist to remind engineers of the many repair options. On one hand …. ASME XI : The repair of safety-related Class 1, 2, and 3 nuclear components is addressed in ASME Boiler & Pressure Vessel Code Section XI and in a series of ASME XI Code Cases. The use of ASME XI and its Code Cases to select a repair technique...
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