Ideas for this Code part were constructed contemplating the wishes for purposes that come with piping in most cases present in electrical strength producing stations, in business and institutional crops, geothermal heating platforms, and vital and district heating and cooling systems.
Key adjustments to this revision comprise the relocation of the foundations for nonmetallic piping and piping coated with nonmetals from a nonmandatory appendix to a compulsory appendix, chosen language from Nonmandatory Appendix V has been moved into the physique of the code in bankruptcy VII, the preheat and submit weld warmth remedy principles were reformatted into tabular shape for readability, and chilly forming ideas for creep energy superior ferritic steels were included into bankruptcy V.
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Extra resources for ASME B31.1-2014
Sustained stress: a stress developed by an imposed loading that is necessary to satisfy the laws of equilibrium between external and internal forces and moments. The basic characteristic of a sustained stress is that it is not self-limiting. If a sustained stress exceeds the yield strength of the material through the entire thickness, the prevention of failure is entirely dependent on the strainhardening properties of the material. A thermal stress is not classified as a sustained stress. Further, the sustained stresses calculated in this Code are “effective” stresses and are generally lower than those predicted by theory or measured in strain-gage tests.
Straight pipe under internal pressure shall have a minimum wall thickness calculated per para. 4 if the pipe is of longitudinal-welded or spiral-welded construction designed for sustained operation within the creep range. (See para. ) inspected to ensure complete removal of discontinuities. [Refer to para. 4) All weld repairs of depth exceeding 1 in. 2) above and by magnetic particle or dye penetrant inspection of the finished weld surface. All weld repairs of depth less than 20% of the section thickness, or 1 in.
4. NOTE: When computing the design pressure for a pipe of a definite minimum wall thickness by eq. (9) or (10), the value of P obtained by these formulas may be rounded out to the next higher unit of 10. For cast iron pipe, see para. 2(B). 3) Do p outside diameter of pipe, in. (mm). For design calculations, the outside diameter of pipe as given in tables of standards and specifications shall be used in obtaining the value of tm. When calculating the allowable working pressure of pipe on hand or in stock, the actual measured outside diameter and actual measured minimum wall thickness at the thinner end of the pipe may be used to calculate this pressure.