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All Journal RESWARA: Jurnal Riset Ilmu Teknik
Sentot Novianto
Program Studi Teknik Mesin, Fakultas Teknologi Industri, Universitas Trisakti, Jakarta, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Comparative Structural Integrity Assessment of Buried Gas Pipelines at Road Crossings Based API RP 1102 for Minimum Safe Burial Depth Hary Munandar; Larasati Rizky Putri; Tono Sukarnoto; Sentot Novianto; Azka Aulia
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 4 (2026): RESWARA: Jurnal Riset Ilmu Teknik, October 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i4.859

Abstract

The structural integrity of buried gas pipelines at road crossings is critically affected by external vehicular loads, particularly under shallow burial conditions. Existing studies predominantly rely on single analytical approaches, which may not adequately capture the complex soil pipe interaction and load transfer mechanisms. This study addresses this gap by proposing a comparative multi method framework to determine the minimum safe burial depth of pipelines. A 12 inch gas pipeline is evaluated using three complementary approaches, API RP 1102, CEPA analytical method, and three dimensional Finite Element Analysis (FEA). The analysis integrates realistic operational parameters, soil properties, and heavy vehicular loads up to 50 tons, with structural performance assessed against ASME B31.8 allowable stress criteria. Results reveal a consistent attenuation of stress with increasing burial depth across all methods. The CEPA method provides conservative predictions, indicating a maximum stress ratio of 69.9% SMYS at 0.7 m, while FEA captures more realistic stress redistribution, yielding lower stress ratios (59.55%). Notably, depths below 0.7 m exhibit significantly higher stress levels, approaching critical limits, particularly under combined loading scenarios. This study establishes 0.7 m as the minimum safe burial depth, validated through multi method agreement. Furthermore, it demonstrates that integrating analytical and numerical approaches enhances reliability in pipeline design. For shallow installations, structural protection systems are essential to mitigate load induced stress and vibration.
Strength Analysis of a 6-Inch Gas Pipeline Under Deflection Using ASME B31.8 Strain-Based Design: A Case Study at KP.03+500 Hary Munandar; Larasati Rizky Putri; Tono Sukarnoto; Sentot Novianto; Azka Aulia
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 4 (2026): RESWARA: Jurnal Riset Ilmu Teknik, October 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i4.861

Abstract

Natural gas transmission pipelines are susceptible to deflection due to ground settlement, heavy traffic loads, and surrounding construction activities. This study evaluates the structural response of a 6-inch API 5L X52 gas pipeline experiencing a vertical deflection of 9 cm over a chord length of 370 cm at KP.03+500. The assessment uses the sagitta-based radius of curvature together with a strain-based framework. The revised calculation separates longitudinal bending strain from extensional strain. The measured geometry gives a radius of curvature of 1905.9 cm and a deflection angle of 11.12°. The longitudinal bending strain is 0.0186%, the extensional strain is 0.0296%, and the combined longitudinal strain is 0.0482%, below the material yield strain of 0.1760% and the adopted 0.25% normal-operation criterion. The elastic bending stress is 37.9 MPa, while the hoop stress due to MAOP is 36.77 MPa. Sensitivity analysis indicates that the yield-strain threshold is reached at approximately 19.3 cm and the 0.25% strain criterion at approximately 23.5 cm. The measured 9 cm deflection therefore retains a calculated yield-strain margin of approximately 10.3 cm. The assessment provides an analytical screening framework for field integrity evaluation while recognizing limitations associated with single-point measurement and simplified pipe-soil interaction.
Co-Authors Azka Aulia Larasati Rizky Putri Munandar, Hary Tono Sukarnoto