Using the software ANSYS-19.2/Explicit Dynamics, this study performed finite-element modeling of the large-diameter steel pipeline cross-section for the Beineu-Bozoy-Shymkent gas pipeline with a non-through straight crack, strengthened by steel wire wrapping. The effects of the thread tensile force of the steel winding in the form of single rings at the crack edges and the wires with different winding diameters and pitches were also studied. The results showed that the strengthening was preferably executed at a minimum value of the thread tensile force, which was 6.4% more effective than that at its maximum value. The analysis of the influence of the winding diameters showed that the equivalent stresses increased by 32% from the beginning of the crack growth until the wire broke. The increment in winding diameter decelerated the disclosure of the edge crack and reduced its length by 8.2%. The analysis of the influence of the winding pitch showed that decreasing the distance between the winding turns also led to a 33.6% reduction in the length of the straight crack and a 7.9% reduction in the maximum stresses on the strengthened pipeline cross-section. The analysis of the temperature effect on the pipeline material, within a range from −40°C to +50°C, resulted in a crack length change of up to 5.8%. As the temperature dropped, the crack length decreased. Within such a temperature range, the maximum stresses were observed along the central area of the crack, which were equal to 413 MPa at +50°C and 440 MPa at −40°C. The results also showed that the presence of the steel winding in the pipeline significantly reduced the length of crack propagation up to 8.4 times, depending on the temperature effect and design parameters of prestressing. This work integrated the existing methods for crack localization along steel gas pipelines.
Novel Methodologies for Preventing Crack Propagation in Steel Gas Pipelines Considering the Temperature Effect
Bonopera, Marco
;
2025
Abstract
Using the software ANSYS-19.2/Explicit Dynamics, this study performed finite-element modeling of the large-diameter steel pipeline cross-section for the Beineu-Bozoy-Shymkent gas pipeline with a non-through straight crack, strengthened by steel wire wrapping. The effects of the thread tensile force of the steel winding in the form of single rings at the crack edges and the wires with different winding diameters and pitches were also studied. The results showed that the strengthening was preferably executed at a minimum value of the thread tensile force, which was 6.4% more effective than that at its maximum value. The analysis of the influence of the winding diameters showed that the equivalent stresses increased by 32% from the beginning of the crack growth until the wire broke. The increment in winding diameter decelerated the disclosure of the edge crack and reduced its length by 8.2%. The analysis of the influence of the winding pitch showed that decreasing the distance between the winding turns also led to a 33.6% reduction in the length of the straight crack and a 7.9% reduction in the maximum stresses on the strengthened pipeline cross-section. The analysis of the temperature effect on the pipeline material, within a range from −40°C to +50°C, resulted in a crack length change of up to 5.8%. As the temperature dropped, the crack length decreased. Within such a temperature range, the maximum stresses were observed along the central area of the crack, which were equal to 413 MPa at +50°C and 440 MPa at −40°C. The results also showed that the presence of the steel winding in the pipeline significantly reduced the length of crack propagation up to 8.4 times, depending on the temperature effect and design parameters of prestressing. This work integrated the existing methods for crack localization along steel gas pipelines.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
