Nonmetallic Pressure Piping System Standards | Energy

Design by Analysis - A general guideline for pressure vessel

This presentation file is provided by Mr. Ghanbari and published under permission. The presentation gives an introduction and general guideline for pressure vessel design by analysis. The &#;design by analysis&#; procedures are intended to guard against eight possible pressure vessel failure modes by performing a detailed stress analysis of the vessel with the sufficient design factors. The failure modes are: 1.excessive elastic deformation, including elastic instability, 2.excessive plastic deformation, 3.brittle fracture, 4.stress rupture/creep deformation (inelastic), 5.plastic instability - incremental collapse, 6.high strain - low cycle fatigue, 7.stress corrosion, and 8.corrosion fatigue Most of the &#;design by analysis&#; procedures that are given in ASME BPVC relate to designs based on &#;elastic analysis.&#; The design-by-analysis requirements are organized based on protection against the failure modes listed below. The component shall be evaluated for each applicable failure mode. If multiple assessment procedures are provided for a failure mode, only one of these procedures must be satisfied to qualify the design of a component. a)All pressure vessels within the scope of this Division, irrespective of size or pressure, shall be provided with protection against overpressure in accordance with the requirements of this Part. b)Protection Against Plastic Collapse &#; these requirements apply to all components where the thickness and configuration of the component is established using design-by-analysis rules. c)Protection Against Local Failure &#; these requirements apply to all components where the thickness and configuration of the component is established using design-by-analysis rules. It is not necessary to evaluate the local strain limit criterion if the component design is in accordance with Part 4 (i.e. component wall thickness and weld detail per paragraph 4.2). d)Protection Against Collapse From Buckling &#; these requirements apply to all components where the thickness and configuration of the component is established using design-by-analysis rules and the applied loads result in a compressive stress field. e)Protection Against Failure From Cyclic Loading &#; these requirements apply to all components where the thickness and configuration of the component is established using design-by-analysis rules and the applied loads are cyclic. In addition, these requirements can also be used to qualify a component for cyclic loading where the thickness and size of the component are established using the design-by-rule requirements of Part 4.

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