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ASME CASE-2605-2-2015 pdf download

ASME CASE-2605-2-2015 pdf download.Fatigue Evaluation for SA-182 F22V, SA-336 F22V, SA-541 22V, SA-542 Type D, Class 4a, and SA-832 Grade 22V at Temperatures Greater Than 371°C (700°F) and Less Than or Equal to 482°C (900°F).
Inquiry: Under what requirements may pressure parts constructed with SA-182 F22V, SA-336 F22V, SA-541 Grade 22V, SA-542 Type D, Class 4a, and SA-832 Grade 22V be evaluated for fatigue for operating temperatures greater than 371°C (700°F) and less than or equal to 482°C (900°F)? Reply: It is the opinion of the Committee that pressure parts constructed with SA-182 F22V, SA-336 F22V, SA-541 22V, SA-542 Type D, Class 4a, and SA-832 22V may be evaluated for fatigue for operating temperatures greater than 371°C (700°F) and less than or equal to 482°C (900°F) using Section VIII, Division 2 (2007 Edition or later), provided the following requirements are satisfied. (a) The time, temperature, and load history shall be provided in the User’s Design Specification. The load his- tory shall include both design and operating conditions. The design conditions shall be used for analyses defined in (b) and (c). The operating conditions are used for ana- lyses defined in (d) and (e). The maximum permissible temperature for the analyses defined in (d) and (e) is 482°C (900°F). (b) The design of pressure parts or nonpressure parts, i.e., skirt and skirt attachment, may be in accordance with the design-by-rule requirements of Part 4 or the design- by-analysis requirements of Part 5. In either case, the al- lowable stress, S, to be used for design shall be in accor- dance with Table 5A ofASME Section II, Part D. Ifdesign- by-analysis is used to qualify the design ofa pressure part or nonpressure part, the design-by-analysis shall be based on the elastic stress analysis methods in Part 5. (c) Restrictions on the design ofpressure parts shall be as follows: (1) The diameter ratio of the shell shall satisfy . (2) Standard pressure parts that comply with an ASME product listed in Part 1, Table 1.1, and para. 4.1.11 may be used for closure components or piping con- nections at the pressure-temperature rating listed in the ASME standard. (3) The skirt attachment detail shall be in accordance with para. 4.2, Fig. 4.2.4, illustration (e). Figure 4.2.4, illus- tration (f) may be used if the requirements of (d)(5) are satisfied. (4) Integral reinforcement shall be used for nozzles and conical transitions. (5) Flange designed in accordance with Part 4, para. 4.16 may be used for closure components or piping con- nections, except that the allowable stress, S, shall be in ac- cordance with Table 1A of Section II, Part D.
(-b) Option 2. If it is elected not to perform a sim- plified analysis as per Option 1, or if such an analysis is carried out and fails to demonstrate elastic shakedown according to the criterion stated in Option 1, then a full in- elastic analysis shall be performed using the actual time- dependent thermal and mechanical loading histograms, including all operating cycles and their associated hold times. This analysis shall be continued for all cycles de- fined in the load histogram including their associated hold times, or until the analysis demonstrates shakedown to a stable state or a steady ratchet deformation. In either case, the strain limits in (6)(-a) shall be satisfied.
(5) The creep damage at all locations shall be such that D c < 1.0. In addition, the weldment and adjacent base material ofall weld joints shall be located a minimum dis- tance of 25 mm (1 in.), measured from the weld bevel, from regions where the creep damage, D c , exceeds 0.50. (6) Based on the results of the inelastic analysis, the following criteria shall be satisfied: (-a) The equivalent total accumulated inelastic strain shall not exceed the values in Table 2. (-b) If the design of the component is based on Part 5, see para. (b), then the protection against local fail- ure shall be determined in accordance with Part 5, para. 5.3.3. This analysis shall not consider the effects ofcreep. (e) The permissible number of cycles, N, and the creep life with fatigue, L cwf , at each point in the component shall be determined in accordance with one ofthe follow- ing methods. The permissible number of cycles and the creep life with fatigue shall satisfy the specified design re- quirements in the User’s Design Specification.

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