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Hi!, In a flexibility pipe analysis, how to modeling a nozzle connected to a pressure vessel at the end of a pipe?, How to modeling the structural stiffness of the vessel? Such stiffness could be replaced by any flexible boundary condition at nozzle? Thanks in advance, Jack.

Hi everyone, What means ">360°" in table 9B.14 of API 579/FFS-1 2016? (see image below): Thanks in advance. Jack

Hi everyone I have doubt about meaning of local failure criteria addressed in API 579. Is it a material rupture criteria? Why no simply to compare the local platic equivalent strain with the failure strain measured from tension test? Thanks in advance Jack

Hi there! I have a pressure load spectra with pmax = 1500 psi and pmin=0 psi. When I using rainflow algorithm for cycle counting, I obtain both mean and range value blocks higher than pmax. ¿Is this possible? Thanks in advance, Jack

I have a doubt about MAWOP calculation in FFS-III burst analyisis of pipelines under internal pressure, considering corrosion metal loss. Most of MAWOP FEA calculations reported in the literature considers full yielding of the remanent material in metal loss zone as failure criteria. Thus, the...

Hi I want to perform a fatigue crack growth analysis for a thin walled fractured vertical mast under win loads. ¿How can I perform this kind of analysis if spectral win load (aerodynamic pressure load over mast) is provided?. I have experience with crack propagation analysis under quasi-static...

Can be used the hole-drilling method to measure residual stress in buried pipelines (pressurized pipelines)? ¿how dangerous it can be? Thanks, Jack

Hi. Deformational processes, like a dent (15% deep), in a pipeline (API 5LX65) changes the S-N fatigue curve of the deformed material? Thanks

Hi there. For fatigue analysis procedure described in section B-1.5.3 of API 579 ¿In which of equations B1.30, B1.35, F.214 or F.215, fatigue modifying factors (surface finish factor, loading factor, etc.) must be applied? Thanks! Jairo

Hi everyone! I have doubt about Tangent Modulus (Etan) calculation for FEM elasto-plastic anaysis using equation F.22 (Annex F, MPC model) in API 579. In the Bilinear elasto-plastic with isotropic hardening model a constant Etan is needed, but Etan calculation from F-22 depends on the level of...

Hi, I have a doubt about alternating stress correction in API 579: ¿What about alternating stress correction in order to take into account mean stress (throught Goodman criteria for example)?, I didn't see this in Annex B1 of API 579 Thanks Jack