ASME B31J:2017 pdf free download

ASME B31J:2017 pdf free download.Stress Intensification Factors (i-Factors), Flexibility Factors (k-Factors), and Their Determination for Metallic Piping Components.
modified or derived as described in para. A-3. 1 if needed. The fabrication, welding, and examination of the tested
component shall be the same as that expected to be used in service. Weld contours and procedures should also be representative of those intended to be used in practice. Weld locations where fatigue cracks are likely to originate should be inspected for undercut, welding starts and stops, or other anomalies that may affect fatigue life. Where welding starts and stops, undercuts, or other irregularities are visible at potential crack sites, these imperfections should be documented. All weld profiles, sizes, repairs, and/or photographs should be recorded and included in the Test Report.
Where leakage is anticipated in or adjacent to a weld, the dimensions of the weld in that area should be recorded carefully and variations in the weld contours noted in the Test Report. After the test is completed, the inside weld profile at the failure location should be described in the Test Report with photographs if possible and any anomalies noted.
A-1.3 Applied DispLacement CaLibration
(a) The test specimen shall be niounted in the test assembly to develop a load-deflection diagram using the same procedure that will be used during the cyclic loading portion of the fatigue test. To develop the load-deflection diagram, displacements shall be applied in positive steps in the linear range to obtain a load-displacement diagram similar to that shown in Figure A-1.3- 1. At least five points shall be recorded in the linear region of the diagram. A point can be considered in the linear range ii after the displacement is applied the load does not change for a period of at least 3 minutes.
(bJ The initial loading sequence described in para. (a) shall be stopped when the load-displacement plot Is no longer linear or when a sufficient linear portion of the diagram has been produced. To accommodate this requirement, the loading sequence may require one or two steps into the nonlinear range. If the cycle range is known to be well within the linear portion of the load-deflection plot range produced in para. (a). deflections in the nonlinear portion of the load-deflection diagram are not required, Several cycles within the linear range may be applied to remove fabrication and installation residual effects before the load-displacement plot is produced.
A-5 Nonmandatory Commentary on SIF Test Procedure
ASME B31J is based on the work by E. C. Rodabaugh in WRC Bulletin 392 11 1.The followingcommentary provides a synopsis of the discussion in Ref. 111. Readers who desire more detail are urged to see Refs. [11 through [5].
A-5.1 GeneraL
The Codes for pressure piping (e.g., ASME B31.1; ASME B31.3; ASME Boiler and Pressure Vessel Code (BPVC), Section III, Class 2/3) use stress intensification factors (i-factors) for various piping components and joints as a measure of their fatigue performance relative to girth butt welds. Occasionally, a need arises to establish i-factors for components not included in the Codes, such as a branch connection in an elbow or some proprietary piping component. This Standard provides a set of requirements that will ensure that newly developed ifactors are consistent with existing i-factors.
(ci) Papers by Marki and George (121, (3], 141) provided the basis for most of the i-factors in the Codes. Key aspects of the testing and interpretation of test results are as follows:
(1) a preliminary load-deflection plot is developed (see Figure A-1.3-1)
(2) cyclic bending tests are run with controlled displacements
(3) failure is defined as a through-wall crack
(4) the i-factor is calculated by eq. (A-3)
(h) Markl 151 discusses alIowable stress range and, in Appendices 1 and 2 of [1], describes rules that were eventually incorporated into ANSI B31.1-1955. Reference 151 discusses the following concepts that are fundamental to the use and interpretation of i-factors as a control of fatigue failure:
(1) the i-factors are dependent on dimensions and are independent of the material
(2) as a consequence of subpara. (1) above, i-factors developed by Markl using ASTM A106 Grade B material are presumed to be applicable to components made of any of the metallic materials listed in the piping Codes.