Comparative Study on the Effects of Sudden Expansion and Sudden Contraction Structures on the Deflagration Characteristics of Hydrogen-Methane-Air
Available online 11 June 2025
This study investigates the effect of sudden contraction and expansion structures on the detonation flame propagation of hydrogen-methane-air mixtures through experiments and LES. The study introduces...
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Self-Tuning Clamping Force Control with Optimal Trajectory Tracking for Autonomous Pipe Inspection Robots
Available online 9 June 2025
To address the inability of existing external pipe-climbing robots to adaptively regulate clamping force during operation, a novel robot was developed. To enable automatic clamping in response to varying...
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Microscopic Mechanism of Wax Precipitation and Gelation of Waxy Crude Oil Based on Molecular Dynamics Simulation
Available online 9 June 2025
•Molecular dynamics model links cooling-driven van der Waals dominance to gelation phase transition.•Wax-wax attraction drives gelation, aligning with macro-rheological trends..•RDF peaks rise, Rg drops,...
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Experimental Data-Driven Streamlined Approach for Tampering Detection in Oil and Gas Pipelines
Available online 9 June 2025
Pipelines are essential links of the energy sector for transporting and distributing energy products across countries and from refineries to terminals. With the increasing value of energy products,...
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USA pipeline girth weld failures: an alternative metallurgical analysis of the literature
Available online 9 June 2025
Following reports of pipeline girth weld failures in the USA, Australian Pipeline & Gas Association (APGA) convened a workshop to discuss the technical requirements and structural integrity of their...
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A Critical and Bibliometric Review of Life Cycle Cost Analysis Integration into Decision Support Systems for Pipeline Asset Integrity Management
Available online 6 June 2025
•Maintaining pipeline integrity is essential for safety, environmental protection, and energy security.•Traditional pipeline management is reactive, leading to high costs, safety risks, and inefficiencies.•Life...
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Failure analysis due to collapse pressure in CT-90 coiled tubing in the Mexican oil industry
Available online 4 June 2025
Failure analysis of the ruptured CT-90 grade steel coiled tubing (CT) with a diameter of 44.45mm (1.750"), which became trapped at the bottom of the well, was conducted. Mechanical and microstructural...
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A Two-Fluid Model Incorporating Droplet Entrainment to Predict Pressure Drop and Holdup for CO2 Two-Phase Flow in Horizontal and Vertical Pipe
Available online 4 June 2025
CCUS technology is currently the best practice for reducing CO2 emissions, with pipeline transportation as the primary method for the long-distance, large-scale transport of captured CO2 to storage...
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A novel variable weighted yield criterion and its applications in burst pressure prediction of corroded pipelines
Available online 30 May 2025
The strength theory is a study of the materials' yielding and failure under complex stress. The burst pressure of pipelines with corrosion cannot be predicted accurately under complex loadings. One...
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Burst pressure models and validations for thick-walled pipelines containing corrosion defects
Available online 23 May 2025
Corrosion is one major threat to pipeline integrity. Over the past decades, many corrosion models have been developed for determining the remaining strength of corroded pipelines, including ASME B31.G,...
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Seismic Fragility in Life Cycle Cost Analysis for Gas Pipelines: Design and Cost Optimization Framework
Available online 22 May 2025
This study proposes an innovative approach to optimizing the seismic design of pipeline network by incorporating life-cycle cost analysis (LCCA). The research integrates seismic design, which includes...
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Standards and codes for hydrogen in pipeline infrastructure: testing, qualification, and integrity assessment
Available online 21 May 2025
•Framework with Gaps: Current standards provide foundational guidance for qualifying materials and infrastructure in hydrogen service but are insufficient for addressing the unique challenges of hydrogen...
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Failure mechanism of sealing rubber exposed to supercritical CO₂ during rapid depressurization based on equivalent thermo-mechanical coupling damage model
Available online 19 May 2025
•An Equivalent thermo-mechanical coupling damage model is developed•The SC-CO2 diffusion, deformation and damage of rubber O-ring are studied•SC-CO₂ is more likely to cause damage to O-rings compared...
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Effect of Cr content on softening mechanism of the heat-affected zone of X80 GMAW automatic girth weld
Available online 16 May 2025
Softening of the heat-affected zone (HAZ) could lead to strain concentration in the girth weld joint, which endangers the service safety of high strength pipelines, while the chemical composition and...
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Composite Repair of Large Size Diameter Pipe with Severe Metal Loss Defects
Available online 10 May 2025
A full-scale testing program was conducted to evaluate the use of carbon-epoxy composite repair technology to reinforce severe corrosion defects in large-diameter pipes. The technical elements associated...
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Combined Ductile-Brittle Fracture Simulation of API X80 Under Impact Loading
Available online 8 May 2025
This study explores finite element (FE) simulation of the combined ductile-brittle fracture behavior of API X80 steel under impact loading, incorporating the influences of strain rate and adiabatic...
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Thermal and Residual Stress Distributions in Butt Fusion Joints of HDPE Pipes: FE Simulation and Experimental Validation
Available online 8 May 2025
Butt fusion welding is widely applied for connecting high density polyethylene (HDPE) pipes but may generate residual stresses in the welded joints, interfering the bearing capacity and the service...
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Carbon dioxide pipeline leakage risk assessment based on pipeline failure probability correction and CO2 concentration dispersion distance prediction
Available online 7 May 2025
Given that supercritical or dense-phase carbon dioxide pipelines operate under high-pressure conditions, there exists a significant risk of high-pressure carbon dioxide leakage due to factors such as...
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Blending Hydrogen in Urban Gas Pipeline System: Investigation of the Hydrogen Compatibility of PE Pipeline Material
Available online 6 May 2025
•In-situ tensile, creep, relaxation tests of PE100 in H2 environment were conducted.•MD simulations were conducted to study the mechanism of hydrogen effect.•H2 has no obvious effect on the mechanical...
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Influence of Fe3C on corrosion inhibition efficiency of benzyldimethylhexadecylammonium chloride: Galvanic Corrosion interaction and adsorption behaviour
Available online 2 May 2025
Corrosion products formation on carbon steel in oil and gas environments can induce corrosion galvanic corrosion and hinders corrosion inhibitor (CI) adsorption due to surface heterogeneities (i.e....
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Development and Simulation Analysis of a Novel Flexible Deformation Inspection Units (FDIU) for Oil and Gas Pipelines
Available online 25 April 2025
Oil and gas pipelines are essential for energy transportation, and their integrity is critical for safety and efficiency. Deformations such as dents can lead to failures, necessitating regular condition...
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Mechanical response of the pressure pipeline rehabilitated by polymer liner under the action of surface load
Available online 25 April 2025
The mechanical behavior of pressure pipelines rehabilitated with polymer liners under surface loads remains poorly understood. In this study, a three-dimensional model of a pressure pipeline repaired...
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Study on fracture behavior analysis of X70 steel girth weld with toughness scatter
Available online 24 April 2025
This study conducting a comparative analysis of the microstructure and mechanical properties of X70 pipeline steel various girth welds. The toughness scatter about Flux-Core Arc Welding (FCAW) of X70...
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Investigation of cavitation damage patterns in centrifugal pump blades under rotating flow fields
Available online 13 April 2025
To investigate the damage caused by the collapse of cavitation bubbles on the centrifugal pumps impeller wall and to explore the relationship between these bubbles and cavitation pits in a rotating...
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Study on the phenomena and mechanism of reformation during hydrate dissociation of N-vinyl caprolactam system in pipeline
Available online 7 April 2025
Natural gas hydrate blockage is a major threat to the flow safety of long-distance transmission pipelines in deep water. Although the addition of hydrate inhibitors can effectively mitigate hydrate...
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