EnginSoft Partnership
previus next

Finite element modeling, fluid-dynamic analysis and structural verification of 36"nd and 20"nd pipelines with custom y-tee

THE PROBLEM

Scope of the work: Fluid-Dynamic and Structural verification of a portion of piping under different conditions (Installation, Hydraulic test, Start Up, Normal Run). Optimization of CupDisk® supports stiffness, in order to minimize stress state on the structure's supports

MODEL

Finite element structural models of a portion of piping, of the custom Y-Tee in detail, and of End Flanges were built and meshed both with shell elements (general model) and solid elements (local models).
The final geometry was the result of CFD optimization on internal mixed-phase flow.

ANALYSIS and RESULTS
  • A CFD analysis on the internal flow on a preliminary geometry of the pipeline aimed to optimize the shape and find the minimum pressure drop geometry.
  • A thermo-structural analysis of every single phase of the life of the pipeline, from installation on holding tank (not modeled) to Normal Run condition, passing through hydraulic test and start up and cooling down steps (Maximum T=109°C, max P=6 barg).
  • Detail model of the Y-Tee, calculation of SIF and comparison with the mono-dimensional model.
  • Optimization of stiffness constant of CupDisk® elastic supports, in order to reduce stress values near the connecting supports.
  • Stress verification of pipeline and end flanges, according to ASME VIII div. 2 and ANSI B31.3 Rule Codes.
  • After geometry and stiffness optimization, stress check is satisfied in each phase of the pipeline life.
CUSTOMER

Saipem - Italy

SCOPE OF THE WORK:

Fluid-Dynamic and Structural verification of a portion of piping under different conditions (Installation, Hydraulic test, Start Up, Normal Run). Optimization of CupDisk® supports stiffness, in order to minimize stress state on the structure's supports