The Computational Mechanics team at SRK Argentina has successfully conducted numerical modeling to analyze the deformation of raceways during the cold bending process of service pipes.
Raceways are designed to provide a conduit within the service pipe, allowing for the insertion of a heating cable. This cable is crucial for maintaining the temperature of oil as it is transported at very low temperatures. It was observed that lateral deformation of the raceways could potentially lead to internal obstructions, preventing the insertion of a 27mm diameter cable.
During preliminary testing, instances of denting and local buckling in the raceways were identified, prompting the need for detailed finite element modeling. The primary goal of this project was to determine the maximum bending angle that could be applied by the bending machine without inducing local buckling.
The internal machinery was found to be adept at regulating the cold bending radius, enabling the establishment of precise lower and upper limits for the bending angle increment.
A thorough sensitivity analysis was performed on the model, adjusting parameters such as the raceway's thickness, profile, and the boundary conditions associated with thermal insulation confinement. This approach resulted in significant cost savings by reducing the need for expensive full-scale testing.
In conclusion, the study revealed that the bending angle was surpassing the threshold before local buckling occurred. The most effective strategy to enhance the bending angle without compromising the integrity of the raceway was to increase its thickness.
