Uncertanties in expansion stress evaluation criteria in piping codes. (January 2019)

• Record Type: Journal Article
• Authors: Jaćimović, Nikola
• Is Part Of: International journal of pressure vessels and piping. Volume 169(2019)
• Page Start: 230
• Page End: 241
• Publication Date: 2019-01
• Subjects: Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2019.01.003
• Languages: English
• ISSNs: 0308-0161

Abstract

Abstract: ASME B31 and EN 13480-3 piping design codes are considered as the state-of-the-art codes for many piping engineers. However, as shown in this paper, there seem to be inconsistencies between ASME B31 code and more elaborate calculation codes, such as ASME Section III. In fact, it is shown in the paper that the ASME B31 approach can produce potentially non-conservative results. This seemingly important flaw in the B31 (and other major) piping codes is based on the allowable stress calculation based on equation (1b) of both ASME B31.1 and B31.3 and has been shown in detail in the paper. Finally, the stated flaw is verified by means of a finite element analysis which corroborates the stated concerns. Highlights: Paper presents an overview and comparison of various piping Code philosophies. Critical overview of verification criteria is provided. New acceptance criteria which guarantee conservative design are proposed. Validation of the statements given in form of FEA verification.