Query regarding rings in cold stretched vessels as per Appendix-44 of ASME Sec VIII Div-1

[kremenco]

Hi All,
The snip of Appendix-44 (i) is given below.

In this context what is meant by "centroid of the ring"? Is it the centroid of the ring structural crosssection or centroid of the ring itself? What is an example of a structural discountinuity mentioned here? Is a longitudinal shell weld joint considered a structural discontinuity?
Request your valuable responses/
Kind Regards,
Ranjit

 

[BEMPE16524]

This is the geometric center of the ring's cross-sectional shape (e.g., rectangular, circular, or custom geometry), not the physical centroid of the ring as a whole in the vessel.

Example of a Structural Discontinuity​

• Changes in wall thickness: Section UG-80
• Openings and nozzles: Section UG-36 to UG-45
• Supports or lugs: Section Appendix G and UG-22
• Flange connections: Section Appendix 2
• Reinforcement rings or stiffeners: Sections UG-29 and UG-30
• longitudinal shell weld joint:
  • UG-22(d): Discusses stresses resulting from welding processes as factors in the vessel's design.
  • UW-3 and UW-9: Require weld joint types to meet strength and integrity requirements, recognizing the stress implications of welds.
  • U-2(g): Stipulates that any design must account for all potential stress concentrations and discontinuities, including welds.

 

[kremenco]

Hi BEMPE16524,​

Thanks for your response.
Regards,
Ranjit