All You Need to Know About ASME B31.1 2020 Code Changes

by Engineering Geek Expert in industrial engineering including piping,
Power piping is usually found in electric power generating stations, industrial & institutional plants, geothermal heating systems, and central/district heating & cooling systems. Any failure in the piping system hinders its performance and results in losing power, air conditioning, and more. So, it is crucial that power piping should adhere to the code. 

American Society of Mechanical Engineering (ASME) ’s code B31.1 serves as an essential reference for anyone engaged with the piping industry. It is intended for manufacturers, designers, owners and operators of piping systems. The significant services cover steam, water, oil, gas & air services and all potential governing entities. It details requirements for materials, design, fabrication, erection, examination, inspection, testing and maintenance of piping systems.

This code applies to piping for the following fluids;

  • raw, intermediate and finished chemicals
  • petroleum products
  • gas, steam, air and water
  • fluidized solids
  • refrigerants
  • cryogenic fluids

This article highlights several fundamental changes made to the latest edition of the ASME B31.1-2020 – Process Piping code. It consists of a revision in the 2018 edition of the same standard code as the key document for the industry. 

Revised definitions included ferrous material, linear indication, maintenance, nonferrous, rounded indication, post-weld hydrogen bakeout & volumetric examination.

The revised edition has a new section 101.2.6 that specifies provision to safely hold or release any expected pressure from the piping system.

Design minimum temperature may create unique design and material qualification requirements.

The new section suggests that attention should be given to how ambient temperature conditions impact the displacement stress analysis.

It provides consideration to how piping shall be designed, arranged, and supported to stand up to fluid pressure and momentum effects during normal processes and projected transients.

New section - 101.9 addition for reduced ductility effects.

Clarification of visual examination requirements

Chapter VI Inspection, Examination and Testing - It covers the content of the in-process examination.

Section 137.4.6 contains special provisions for testing piping elements, closure welds, subassemblies and flanged joints. 

New procedures added as an alternative to pneumatic and hydrostatic testing in the new section named 137.1

ASME B31.3 2020 standard specifies that the repair and maintenance of covered piping systems are to be conducted according to the code used for the original construction. It shall be in-line with the owner and jurisdictional authority’s suggestion if applicable. 

New section 149 outlines rerating piping systems.

The addition of B31P as an alternative for heat treatment and minimum preheat requirements

Stress equation changes to incorporate B31J Stress Intensification Factors into Chapter II and Appendix G

The significant change w.r.t stress analysis of piping systems is the deletion of Appendix D and referring the users to B31J to determine SIF and flexibility factors.

Inclusion of Figure 100.1.2-8, “Code Jurisdictional Limits for Piping — Firetube Boiler,” & Figure 104.8-1, “Equations (15 Stress Due to Sustained Loads), (16 Stress Due to Occasional Loads), and (17 [Stress Due to Displacement Load Ranges]),” and several other figures were revised. 

The changes in ASME B31.1 2020 code are many as listed above. They touch on many aspects of power piping included in the standard document. Users can easily find any alteration made to the code revision by noting the number (20) in the margin.

Are you looking for piping flexibility and stress analysis services for your process industry? If yes, consider hiring an experienced engineering partner that adheres to the latest international codes and standards.

Sponsor Ads

About Engineering Geek Junior   Expert in industrial engineering including piping,

1 connections, 0 recommendations, 17 honor points.
Joined APSense since, November 20th, 2019, From Seattle, United States.

Created on Mar 16th 2021 08:26. Viewed 258 times.


No comment, be the first to comment.
Please sign in before you comment.