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Processes
Special Issues
Design, Inspection and Repair of Oil and Gas Pipeline
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Design, Inspection and Repair of Oil and Gas Pipeline

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 31 May 2026 | Viewed by 2195

Special Issue Editors

Prof. Dr. Hong Zhang

E-Mail Website
Guest Editor
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, No.18, Fuxue Road, Beijing 102249, China
Interests: oil and gas pipeline; pipeline integrity; pipeline strength design
Dr. Dong Zhang

E-Mail Website
Guest Editor
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, No.18, Fuxue Road, Beijing 102249, China
Interests: pipeline integrity; safety assessment of hydrogen-blended pipelines
Dr. Xiaoben Liu

E-Mail Website
Guest Editor
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, No.18, Fuxue Road, Beijing 102249, China
Interests: oil and gas pipeline; pipeline integrity; pipeline internal inspection
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Oil and gas pipelines serve as critical infrastructure within the global energy supply chain, enabling the safe and efficient long-distance transportation of hydrocarbons. Nevertheless, these systems are continually subjected to operational stresses, environmental exposure, and material degradation, which may lead to potential failures with serious economic, safety, and environmental implications. Ensuring pipeline integrity and extending service life require ongoing advances in the design, inspection, monitoring, and repair of pipeline networks.

This Special Issue, entitled “Design, Inspection and Repair of Oil and Gas Pipeline”, seeks to collect and present cutting-edge research and comprehensive review articles addressing recent innovations, challenges, and practical solutions in the field. We welcome contributions related to, but not limited to, the following topics:

  • Advanced design methodologies and structural integrity assessments;
  • Integrity management systems and risk-based inspection frameworks;
  • Non-destructive testing (NDT) technologies and smart inspection tools;
  • Real-time condition monitoring and data-driven integrity evaluation;
  • Corrosion control, prevention, and management strategies;
  • Rehabilitation techniques including composite repair systems and in-service welding;
  • Performance of pipelines under extreme conditions and climate adaptability;
  • Applications of artificial intelligence and machine learning in integrity forecasting;
  • Environmental impact assessments and sustainability considerations in pipeline projects;
  • Case studies on failure analysis, maintenance optimization, and lifecycle extension.

We cordially invite researchers, engineers, and industry specialists to submit original research and reviews that offer new insights and support the enhancement of safety, reliability, and sustainability in oil and gas pipeline operations.

Prof. Dr. Hong Zhang
Dr. Dong Zhang
Dr. Xiaoben Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • oil and gas pipeline
  • design
  • inspection
  • repair
  • safety evaluation
  • NDT
  • integrity management

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Published Papers (3 papers)

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Research

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28 pages, 6949 KB  
Article
Fracture Behavior of Cracked Girth Welded Joints in Unequal Wall Thickness Pipelines
by Rui Cao, Zhongjia An, Kezheng Zhang, Han Zhang and Haonan Zhang
Processes 2026, 14(5), 819; https://doi.org/10.3390/pr14050819 - 2 Mar 2026
Viewed by 475
Abstract
Accurately predicting the ultimate tensile strain of full-scale pipelines with unequal wall thickness containing cracked girth weld joints is essential for strain-based design, structural integrity assessment, and safe operation. However, many existing limit state prediction methods for full-scale girth welds are developed for [...] Read more.
Accurately predicting the ultimate tensile strain of full-scale pipelines with unequal wall thickness containing cracked girth weld joints is essential for strain-based design, structural integrity assessment, and safe operation. However, many existing limit state prediction methods for full-scale girth welds are developed for equal wall thickness configurations or idealized geometries, and their applicability to unequal wall thickness conditions remains limited. To address this gap, this paper develops a limit state prediction model for the ultimate tensile strain of cracked girth welded joints in full-scale pipelines with unequal wall thickness. The model is established using a numerical database generated from finite element simulations, incorporating realistic pipe geometry, material properties, wall thickness mismatch, and representative crack defect characteristics. By considering the stress and strain concentration effects induced by geometric non-uniformity in the weld region, the proposed model provides a practical and efficient tool for limit state evaluation. During pipeline construction, it supports the formulation of quantitative requirements for key design and fabrication parameters, such as the strength matching level. During stable operation, it enables reliable prediction of the strain capacity of existing girth welds in pipelines with unequal wall thickness, thereby supporting integrity management and decision making for safe service. Full article
(This article belongs to the Special Issue Design, Inspection and Repair of Oil and Gas Pipeline)
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36 pages, 5952 KB  
Article
Pseudo-Static Finite-Element Assessment of Seismic Soil–Pipeline Interaction in Multi-Line Buried Pipelines
by Maryam Alrubaye, Mahmut Şengör and Ali Almusawi
Processes 2026, 14(3), 491; https://doi.org/10.3390/pr14030491 - 30 Jan 2026
Viewed by 611
Abstract
This study investigates the seismic response of double- and triple-buried steel pipeline systems using finite-element modeling in RS2, with particular emphasis on soil–pipeline interaction and symmetry-breaking behavior under pseudo-static seismic loading. Although the pipeline systems are initially symmetric in geometry, material properties, and [...] Read more.
This study investigates the seismic response of double- and triple-buried steel pipeline systems using finite-element modeling in RS2, with particular emphasis on soil–pipeline interaction and symmetry-breaking behavior under pseudo-static seismic loading. Although the pipeline systems are initially symmetric in geometry, material properties, and boundary conditions, the analysis demonstrates that directional seismic excitation induces quantitatively measurable asymmetric responses in shear force, displacement, and spacing due to nonlinear soil–pipeline interaction. Five parametric scenarios were examined, including burial depth (1–5 m), pipeline diameter (8–56 in.), groundwater table (1.4–20 m), peak ground acceleration (0.1–0.6 g), and soil type. The results show that maximum shear forces increase with burial depth and diameter, reaching approximately 15–17 kN in clayey soils at a PGA of 0.4 g, whereas sandy and heterogeneous soils produce lower shear forces (≈12–14 kN). Horizontal displacements are strongly governed by groundwater and PGA, increasing from about 1.2–1.8 m in dry or deep groundwater conditions to more than 2.8 m for shallow groundwater and exceeding 5 m at PGA = 0.6 g. Triple-pipeline systems exhibit higher shear demand due to confinement effects, with the middle pipeline often developing the largest shear force, while the pipeline facing the seismic load consistently experiences the greatest displacement. This study makes two primary contributions. First, it demonstrates that initially symmetric multilined buried pipeline systems exhibit systematic, quantifiable symmetry-breaking behavior under directional seismic loading, manifested as unequal shear forces, displacements, and interaction effects among adjacent pipelines. Second, it presents an integrated multi-parameter coupling analysis that simultaneously accounts for burial depth, pipeline diameter, groundwater level, soil type, and peak ground acceleration, revealing interaction mechanisms that cannot be captured through single-parameter or single-pipeline assessments. Full article
(This article belongs to the Special Issue Design, Inspection and Repair of Oil and Gas Pipeline)
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Review

Jump to: Research

29 pages, 1510 KB  
Review
State of the Art of Fracture Assessment Method on High-Strength Oil and Gas Pipeline Girth Weld
by Xiaoben Liu, Dong Zhang, Jiaqing Zhang, Qingshan Feng, Zhongjia An and Hong Zhang
Processes 2025, 13(12), 4071; https://doi.org/10.3390/pr13124071 - 17 Dec 2025
Viewed by 692
Abstract
High-strength oil and gas pipeline girth welds exhibit significant material and geometric discontinuities with high susceptibility to defects, making them a critical weak link in oil and gas pipelines. Researching the fracture assessment technology pipeline’s girth welds is essential for enhancing the pipeline’s [...] Read more.
High-strength oil and gas pipeline girth welds exhibit significant material and geometric discontinuities with high susceptibility to defects, making them a critical weak link in oil and gas pipelines. Researching the fracture assessment technology pipeline’s girth welds is essential for enhancing the pipeline’s inherent safety and protection levels. Key issues and research progress related to fracture assessment technology are systematically addressed from the perspectives of pipeline fracture behavior and fracture assessment methods in this paper. The core focus of fracture behavior research is determining the crack driving force at the girth weld and the material’s fracture toughness. Fracture assessment methods include failure assessment diagrams and limited tensile strain capacity models. The development of single-parameter and multi-parameter fracture mechanics theories in establishing the relationship between in-plane and out-of-plane constraints and material fracture toughness is reviewed. Four commonly used methods for calculating crack driving forces in pipelines are presented. Moreover, the usage scenarios of various failure assessment diagrams in pipeline fracture assessment are analyzed. A comparison of the parameter ranges and applicability of commonly used international tensile strain capacity models is also provided. The paper highlights existing issues in current research on the fracture assessment of high-strength pipelines and outlines directions for further study. Lastly, this paper aims to provide theoretical and technical support for improving the inherent safety level of high-strength pipeline girth welds. Full article
(This article belongs to the Special Issue Design, Inspection and Repair of Oil and Gas Pipeline)
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