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Navigating the Evolution: ASME Section VIII, Division 2 Certification Changes

Updated: Feb 1

The 2023 edition of ASME Section VIII, Division 2 introduces a transformative shift in the certification landscape, specifically impacting the Users Design Specification (UDS) and Manufacturer's Data Report (MDR). The update eliminates the requirement for certification by a Certifying Engineer (CE), typically a licensed Professional Engineer (PE), for vessels falling under both Class 1 and Class 2, provided no advanced analysis is required. This change prompts a crucial question: how will this modification shape the appeal of designing, building, or purchasing Section VIII, Division 2 vessels?

UDS Certification Update:

The UDS, a cornerstone document outlining design specifications for pressure vessels, experiences a paradigm shift in its certification requirements. Certification by a CE/PE is no longer mandatory unless the vessel's data necessitates a fatigue analysis. While the UDS remains indispensable for Class 1 and Class 2 constructions, the removal of the certification mandate for standard cases streamlines processes for industry professionals.


MDR Certification Changes:

In alignment with the UDS, the MDR undergoes a notable transformation in its certification prerequisites. The 2023 edition specifies that certification by a CE/PE is not obligatory unless advanced analysis is conducted, as detailed in 2.3.3.1(a)(1) - (5). This adjustment recognizes that vessels not requiring advanced analysis may not demand the same level of oversight.


Important Notes:

Despite the relaxation in CE/PE certification requirements, it's crucial to emphasize that the creation of both UDS and MDR remains obligatory for Class 1 and Class 2 constructions. Meticulous detailing of design specifications and manufacturing data remains paramount for compliance and safety.


Certification Responsibilities for MDR:

While CE/PE certification is not mandatory for standard cases, the MDR must still be certified by an Engineer or Designer, as elucidated in Annex 2-J. This ensures alignment between manufacturing data and specified design criteria, upholding necessary safety standards.


Impact on Industry Practices:

The revised certification requisites for UDS and MDR signal a potential paradigm shift in industry practices. The introduced flexibility may streamline the design and manufacturing processes for vessels where advanced analysis is not a prerequisite. Engineers, manufacturers, and purchasers now have the opportunity to navigate these changes and evaluate whether Section VIII, Division 2 vessels become a more compelling choice under the revised certification framework.


Additional Note on Paragraph 2.3.3:

It's important to note that while CE certification is not mandatory for both Class 1 and Class 2 vessels, certain circumstances outlined in Paragraph 2.3.3 necessitate CE certification. This includes scenarios such as fatigue analysis, use of Part 5 for determining thickness, design of quick-actuating closures, and dynamic seismic analysis.



The 2023 edition of ASME Section VIII, Division 2 marks a significant departure in the certification requirements for UDS and MDR. The removal of the CE/PE certification mandate for vessels not undergoing advanced analysis sparks questions about its potential impact on industry preferences. How do you foresee this change influencing decisions regarding the design, construction, or purchase of Section VIII, Division 2 vessels? Share your insights in the comments below and engage in the dialogue surrounding this pivotal development in pressure vessel standards.


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**The content of this article is taken from web open source. The blogs are intended only to give technical knowledge to young engineers. Any engineering calculators, technical equations and write ups are only for reference and educational purpose.

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