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

doi:10.70716/reswara.v4i4.861

Authors

Hary Munandar Program Studi Teknik mesin, Fakultas Teknologi Industri, Universitas Trisakti, Jakarta, Indonesia Author
Larasati Rizky Putri Program Studi Teknik mesin, Fakultas Teknologi Industri, Universitas Trisakti, Jakarta, Indonesia Author
Tono Sukarnoto Program Studi Teknik mesin, Fakultas Teknologi Industri, Universitas Trisakti, Jakarta, Indonesia Author
Sentot Novianto Program Studi Teknik mesin, Fakultas Teknologi Industri, Universitas Trisakti, Jakarta, Indonesia Author
Azka Aulia Program Studi Teknik mesin, Fakultas Teknologi Industri, Universitas Trisakti, Jakarta, Indonesia Author

DOI:

https://doi.org/10.70716/reswara.v4i4.861

Keywords:

pipeline deflection, strain-based design, ASME B31.8, bending stress, hoop stress

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.

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