Affiliation:
1. Center for Nuclear Power Plant Structures, Equipment and Piping, North Carolina State University, Raleigh, NC 27695-7908
Abstract
The history of the primary stress design equations for Class 1 and 2 elbows in the ASME Boiler and Pressure Vessel Code (Section III, Division 1, Subsections NB and NC) is reviewed. The review includes the early analytical solutions for elbow bending, Markl’s stress-intensification factor, the development of Code equation (9), the relationship between SIFs and the C2 and B2 stress indices, development of B2 equations that are functions of internal pressure and bend angle, and a suggested definition of the B2 index which is based on nonlinear finite element analysis.
Subject
Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality
Reference64 articles.
1. ASME, 2001, Boiler and Pressure Vessel Code, Section III, Division 1. American Society of Mechanical Engineers, New York, NY.
2. ASME, 2001, Section NB-3213.8.
3. Dodge, W. G., and Moore, S. E., 1972, “Stress Indices and Flexibility Factors for Moment Loadings on Elbows and Curved Pipe,” Weld. Res. Counc. Bull., 179, p. 22.
4. Rodabaugh, E. C., and Moore, S. E. 1978, “Evaluation of the Plastic Characteristics of Piping Products in Relation to ASME Code Criteria,”’ NUREG/CR-0261, p. 5.
5. Moore, S. E., and Rodabaugh, E. C., 1982, “Pressure Vessel and Piping Codes—Background for Changes in the 1981 Edition of the ASME Nuclear Power Plant Components Code for Controlling Primary Loads in Piping Systems,” ASME J. Pressure Vessel Technol. 104, p. 351351.
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