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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.

ASME B31.3 - Substantive Changes in the 2018 Edition for Process Piping

B31-3_ASME
In addition to the many clarifications, updated references to codes and standards, updates to basic allowable stresses, and added listed materials, there are several substantive changes to the 2016 Edition of ASME B31.3, Process Piping, which is scheduled to be issued mid-January 2019. These substantive changes are: Owner Added specific permission for the owner to designate a representative to carry out selected responsibilities required by this Code, and noted that the owner retains ultimate responsibility for the actions of the representatives. Flange Design Added the ASME B&PV Code Section VIII, Division 2, para. 4.16 flange calculation method as an acceptable way to design flanges for B31.3 applications. The Division 2 procedure considers pressure, gasket seating, and externally applied axial forces and net-section bending moments. Stress Intensification and Flexibility Factors Added specific references to ASME B31J-2017 as a resource for stress intensification and flexibility factors as an alternate to Appendix D. High Cycle Fatigue...
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Guest — Sharun Suresh

Flange Design

As per your quote "Added the ASME B&PV Code Section VIII, Division 2, para. 4.16 flange calculation method as an acceptable way to... Read More
Wednesday, 13 November 2019 03:12
Don Frikken

Flange Design

The 2016 edition permitted flange design in accordance with Division 2 for high pressure fluid service only. The 2018 edition adde... Read More
Wednesday, 13 November 2019 08:20
Guest — Bilal Shah

Occasional Allowable per Appen...

Thank you Mr. Frikken for your response. This is very insightful. To clarify my understanding: 1. On using appendix V for calcula... Read More
Friday, 08 November 2019 05:28
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ASME B31.3 - Substantive Changes in the 2016 Edition

ASME B31.3 - Substantive Changes in the 2016 Edition
In addition to the many clarifications, updated references to codes and standards, updates to basic allowable stresses, and added listed materials, there are several substantive changes to the 2016 Edition of ASME B31.3, Process Piping, which is scheduled to be issued on January 4, 2017. These changes are: Severe Cyclic Conditions The definition for severe cyclic conditions was changed. Old Definition: conditions applying to specific piping components or joints in which SE computed in accordance with para. 319.4.4 exceeds 0.8 S A (as defined in para. 302.3.5), and the equivalent number of cycles ( N in para. 302.3.5) exceeds 7000; or other conditions that the designer determines will produce an equivalent effect. New Definition: conditions applying to specific piping components or joints for which the owner or the designer determines that construction to better resist fatigue loading is warranted The new definition is expected to lead to a more appropriate application...
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Guest — Mindy

2016 Edition - Category M

In addition to the percentage change from 20% to 100%, they have also included branch connection conforming to 328.5.4F (Integrall... Read More
Thursday, 09 May 2019 11:32
Don Frikken

2016 Edition - Category M

In my opinion, doing as you suggest would not comply with the rule. The Code requires the welds to be radiographically or ultrason... Read More
Thursday, 09 May 2019 14:37
Don Frikken

Brother in law

For B31.3 piping, one welder can finish all of the passes for a weld.
Tuesday, 17 April 2018 19:14
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