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Design and Analysis

A Simplified Strength Checking Approach for a Header–Nozzle Intersection Under Combined Piping Loads

[+] Author and Article Information
Wei Wang

e-mail: mkwang@fzu.edu.cn

Ligang Yao

College of Mechanical Engineering
& Automation,
Fuzhou University,
Fuzhou,
Fujian 350108, P. R. China

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received May 24, 2011; final manuscript received August 15, 2012; published online December 5, 2012. Assoc. Editor: Maher Y. A. Younan.

J. Pressure Vessel Technol 135(1), 011203 (Dec 05, 2012) (8 pages) Paper No: PVT-11-1128; doi: 10.1115/1.4007643 History: Received May 24, 2011; Revised August 15, 2012

To investigate the strength checking methods for a semi-cylindrical header–nozzle intersection under combined piping loads, the simplified strength checking formulae for two piping load combinations, which are typical in engineering practice, are suggested based on the combined limit piping load interactions of the header. Furthermore, three methods for determining the allowable piping load parameters of the proposed formulae, namely the plastic work curvature (PWC) method of inelastic analysis route for design by analysis (DBA), the twice elastic slope (TES) method of inelastic analysis route for DBA, and the elastic finite element analysis (FEA) method of elastic analysis route for DBA, are presented and compared. Based on the theoretical analyses and the parametric comparison study results of the three methods, it can be concluded that the PWC method, which can take the hardening material effect on the plastic load results into account well and use the engineers' experience independent plastic work as the global indicator of gross collapse, is the most reliable one among the three methods, while the elastic FEA method is of great value for engineers to estimate the allowable piping loads quickly and conveniently.

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Figures

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Fig. 1

Piping load components of the semi-cylindrical header with radial nozzle

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Fig. 2

The limit load interaction of compound piping loads with opening ratio 0.5

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Fig. 3

The summarized interactions of Mb–Fz and Mz-Fs

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Fig. 4

Hardening material model of the aluminum alloy

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Fig. 5

The finite element analysis model of the industrial header

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Fig. 6

The snippet of automatic calculation script of elastic FEA method

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Fig. 7

The My−Wpl curves of the industrial header with curvature superimposed

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Fig. 8

The My-roty response curves of the industrial header

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Fig. 9

The elastic stress contour of the industrial header under Me,ymax together with p

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Fig. 10

Stress evaluation of the industrial header under Me,ymax together with p

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Fig. 11

Normalized allowable piping loads of the parametric headers versus d/D

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