0
Research Papers: Materials and Fabrication

Application of Code Case 2605 for Fatigue Evaluation of Vessels Made in 2.25Cr-1Mo-0.25V Steels Slightly Into Creep Range

[+] Author and Article Information
Susumu Tereda

Professional Engineer
Kobe Steel, Ltd.,
2-3-1 Shinhama Arai-cho,
Takasago, 676-8970, Japan
e-mail: terada.susumu@kobelco.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication In the Journal of Pressure Vessel Technology. Manuscript received March 4, 2011; final manuscript received February 8, 2013; published online June 11, 2013. Assoc. Editor: Osamu Watanabe.

J. Pressure Vessel Technol 135(4), 041401 (Jun 11, 2013) (10 pages) Paper No: PVT-11-1077; doi: 10.1115/1.4023727 History: Received March 04, 2011; Revised February 08, 2013

The current Section VIII Division 2 of ASME code permits only the method based on experience with comparable equipment of paragraph 5.5.2.2 to be used for the exemption from fatigue analysis when the design allowable stress is taken in the time dependent temperature range and the specified minimum tensile strength is greater than 552 MPa. In the case of 2.25Cr-1Mo-0.25V steels, the allowable stress of new Div.2 is higher than that of the old Div.2. Therefore, there are no experiences with comparable equipment. Code Case 2605-1 provides rules for fatigue evaluation of 2.25Cr-1Mo-0.25V steels at temperatures greater than 371 °C and equal to or less than 454 °C. An inelastic analysis including the effect of creep is required to be performed for all pressure parts according to Code Case 2605-1. There are six and more types of nozzles in each hydro-processing reactor. The inelastic analyses shall be performed for all types of nozzles. The simplified screening method for fatigue analyses and the simplified fatigue analysis procedure need to be developed because it takes much time to perform inelastic analyses. This paper provides sample analysis results for various types of nozzles and clarifies issue with respect to implementation of Code Case 2605-1. Then, a proposal for simplification and modification of Option 1 and Option 2 fatigue evaluation methods for nozzles of Code Case 2605-1 are proposed from these investigations.

FIGURES IN THIS ARTICLE
<>
Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Design fatigue curve of CC 2605 as function of creep life absent fatigue

Grahic Jump Location
Fig. 2

Operating conditions for example analyses

Grahic Jump Location
Fig. 3

(a) Mises stress contour of elastic analysis for model 1; (b) History of Mises stress of model 1; (c) History of inelastic strain of model 1; (d) History of creep damage of model 1; (e) Cyclic stress history of model 1; (f) Cyclic stress-strain behavior of model 1

Grahic Jump Location
Fig. 4

(a) Mises stress contour of elastic analysis for model 2; (b) History of Mises stress of model 2; (c) History of inelastic strain of model 2; (d) History of creep damage of model 2; (e) Cyclic stress history of model 2; (f) Cyclic stress-strain history of model 2.

Grahic Jump Location
Fig. 5

(a) Mises stress contour of elastic analysis for model 3; (b) History of Mises stress of mode 3; (c) History of inelastic strain of model 3; (d) History of creep damage of model 3; (e) Cyclic stress history of model 3; (f) Cyclic stress-strain behavior (1–3 cycle) of model 3; (g) Cyclic stress-strain behavior (58–60 cycle) of model 3

Grahic Jump Location
Fig. 8

Proposed simplification of CC 2605 for nozzles Note: Stress indices of 2.6 for outside corner of lateral nozzle in cylindrical shell due to pressure shall be used.

Grahic Jump Location
Fig. 6

(a) Δεpeq and Δεeff history of model 3. (b) Salt and fatigue damage history of model 3.

Grahic Jump Location
Fig. 7

(a) Stress-strain behavior illustrating high temperature shakedown. (b) Stress-strain behavior illustrating high temperature plastic cycling.

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In