Assessment of DBA-L Pressure Vessel Design Method by a Cylindrical Vessel with Hemispherical Ends

Ren Xincheng,Hongjun Li,Xun Huang,P Tandon,W Wisnoe,R Furutani

doi:10.1051/matecconf/201925602001

Ren Xincheng, Hongjun Li + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201925602001

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Abstract

Stress categorization is an essential procedure in Design by Analysis (DBA) pressure vessel design methods based on elastic analysis in ASME and EN code. It was difficult to implement especially around structural discontinuities. A new elastic analysis, DBA-L, was proposed recently to avoid stress categorization. A model of the cylindrical pressure vessel with spherical end is used to check the validity of this method by comparing with other design methods based on stress categorization procedures and elastic-plastic stress analysis from ASME and EN code. The results indicate that the DBA-L is an economic and explicit method, and can be used an alternative method to stress categorization.

Highlights

To protect against Gross Plastic Deformation (GPD) of the pressure vessel, both Design by Formula (DBF) and Design by Analysis (DBA) methods can be used to carry out design procedure
The elastic analysis design assumes elastic mechanics and shell theory [5], and the procedure includes a check against gross plastic deformation (GPD)
Different stresses are limited to certain value, the general primary membrane stress should be less than Sm, local primary membrane stress less than 1.5Sm, and primary membrane plus bending stresses less than 1.5Sm

Summary

Introduction

To protect against Gross Plastic Deformation (GPD) of the pressure vessel, both Design by Formula (DBF) and Design by Analysis (DBA) methods can be used to carry out design procedure. DBA performs detailed stress analysis for the vessel including the complex geometric features It is the most commonly used techniques for pressure vessel design and was introduced in many national standards, codes and guidelines such as ASME VIII-2[2],EN13445[3]. The designer needs to classify the derived membrane and bending stress distributions into primary or secondary stress according to pressure vessel design codes. The current authors [11] proposed a new design method, DBA-L, based on elastic analysis and the lower bound limit load to avoid the problematic stress categorization. This paper assessed the effectiveness of DBA-L by comparing with other design methods

DBA-L design method

Equations and mathematics

Findings

Conclusions