![]() ![]() Note that you may not need to add it to expansion stress range since this is a one time event and would not reverse. This bending stress can then be manually added to the maximum sustained stress in the long radius bend and the results compared to the sustained allowable. You can build a simple cantilever pipe model and apply this moment to the free end in a User case to get the cold bending stress. The moment created by bending can be calculated by E.I/R where E is the elastic pipe material modulus, I is the pipe moment of inertia and R is the bend curvature radius. The way to account for the elastic bending stresses is to calculate them manually and add them to the sustained stress. It is worth pointing out that the overburden stresses act against the initial cold bending stresses. These overburden stresses were recently supported in AutoPIPE for some codes in which case they are added to other sustained stresses In addition to additional checks to insure that the pipe will not buckle under the soil load alone. Similarly, for buried pipe the overburden soil load will add stresses which often are analyzed separately. In most cases these initial stresses are ignored as are circumferential weld stresses. it only reports the stresses due to pressure, temperature and gravity Solution:įrom Karim Rinawi AutoPIPE forum response: Intended for manufacturers, users, constructors, designers, pipeline operation and maintenance personnel, and regulatory personnel, plus all potential governing entities.ASME B31.8, AutoPIPE does not seem to consider the bending stresses in the pipe due to large diameter elastic bends ( 1200 m). Together, they remain essential references for anyone engaged with piping.Ĭareful application of these B31 codes will help users to comply with applicable regulations within their jurisdictions, while achieving the operational, cost and safety benefits to be gained from the many industry best-practices detailed within these volumes. It also serves as a companion to ASME's other B31 codes on piping systems. This Code prescribes comprehensive solutions for materials, design, fabrication, assembly, erection, testing and inspection. Key changes to this revision include updating of gas treating facilities section, updating of repair procedures for steel pipeilnes section, addition of section on hazard analysis for offshore compressor stations, and updating of offshore test pressure section. Gas storage equipment of the closed pipe type that is fabricated or forged from pipe or fabricated from pipe and fittings.Gas transmission and gathering pipelines, including appurtenances that are installed offshore for the purpose of transporting gas from production facilities to onshore locations.ASME B31.8 covers gas transmission and distribution piping systems, including gas pipelines, gas compressor stations, gas metering and regulation stations, gas mains, and service lines up to the outlet of the customer's meter set assembly. ![]()
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