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White paper – Stresses in bends – Rev 2

NIRAS and Stressman has performed a joint study to better understand induction bends. In the study we have performed several parametrical analyses and benchmarked a non-linear analysis against a real burst test. The general conclusion is that simple hand calculations per ASME B31.3 Chapter II is sufficient for many topside applications, as well as subsea carbon steel pipes. Using duplex and super duplex piping for subsea applications, it is a bit more difficult due to HISC. Then a solid 3D FEA based on the thinning and thickening formulas in the document can be used. The document will be extended when more knowledge is retrieved.

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