Although the required minimum thickness (tsr) of T-joints (tees) is calculated from the design pressure and temperature for design, there are no rules or standards for thickness management of wall thinning T-joints for facilities maintenance. This paper describes the comparison between the five pressure test results of T-joints and their numerical simulations using FE analysis and confirms the failure criterion. The investigation for the numerical simulation and the experimental tests showed that ultimate tensile stress (σu) is the most suitable criterion for the burst of T-joints.
Although the required minimum thickness (tsr) of T-joints (tees) of class 2, 3 and lower classes of nuclear power plants in Japan is calculated from the design pressure and temperature for design, there are neither any rules nor standards for thickness management of wall thinning T-joints for facilities maintenance. This paper describes additional parametric study results and proposes a guideline for thickness management of wall thinning T-joints. In other papers related to this project, the experiment and numerical simulation results are reported. This paper refers to these results and performs further investigation under the consideration of JSME (The Japan Society of Mechanical Engineers) design, construction and maintenance codes and standards.
Although the minimum thickness of pipe wall required (t sr ) of T-joints (tees) of class 2, 3 and lower classes of nuclear power plants in Japan is calculated from the design pressure and temperature, there is no rule or standard of wall thinning Tjoints for thickness management.This paper describes the pressure tests procedure and six test results with parameters of T-joint geometry such as outer diameter D, thickness T and T/D to establish structural integrity of wall thinning T-joints. Based on the fracture surface observation, a ductile crack initiation of each test mock-ups was confirmed. INTRODUCTIONThe working group that studies management of wall thinning of branch pipe connections has been established in Japan. This group consists of 11 Japanese electric power companies, 1 research institute, and 3 nuclear plant fabricators. This project performed burst experimental tests for T-joint mock-ups (this paper), FE analyses for the T-joint mock-ups [1], evaluation of external pressure for T-joints [2] and developed a guideline for management of wall thinning of T-joints [3]. Also this project studied T-pipes (welding T-branch connections) by a experimental mock-up test and FE analysis [4] and the management of wall thinning of the T-pipes [5].In Japan, the minimum thickness required of carbon steel piping at the time of the design is t sr by the technical standards. t sr is evaluated by standard formula using pressure, temperature, material, an outer diameter, and allowable stress. The allowable
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