Pramudya, Wayne Alzain (2026) Analisis Stabilitas Tegangan Pipa Three Layer Polyethylene (3LPE) pada Highway Crossing. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sistem perpipaan bawah tanah merupakan sarana utama dalam distribusi minyak dan gas bumi karena mampu mengalirkan fluida secara aman, kontinu, dan efisien. Pada segmen highway crossing, pipa menerima kombinasi tekanan internal, beban tanah (soil load), dan beban lalu lintas (live load) yang berpotensi meningkatkan tegangan pada struktur pipa. Oleh karena itu, diperlukan analisis untuk mengevaluasi integritas struktural pipa agar tetap memenuhi standar keselamatan. Penelitian ini bertujuan menganalisis distribusi tegangan pada pipa baja API 5L Grade X65 berlapis Three Layer Polyethylene (3LPE) menggunakan metode Finite Element Method (FEM) dengan ANSYS Static Structural berdasarkan standar ASME B31.4 dan API RP 1102. Hasil analisis menunjukkan bahwa tegangan ekuivalen maksimum (von Mises stress) sebesar 202 MPa, masih berada di bawah tegangan izin sebesar 322,67 MPa, dengan nilai safety factor sebesar 1,9. Perbandingan hasil simulasi dengan perhitungan analitis menghasilkan selisih sekitar 10,44%, yang menunjukkan kesesuaian yang baik. Berdasarkan hasil tersebut, desain pipa 3LPE pada segmen highway crossing dinyatakan aman dan memenuhi persyaratan standar untuk kondisi operasi.
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Underground pipeline systems play a vital role in oil and gas transportation due to their ability to deliver fluids safely, continuously, and efficiently. At highway crossing sections, pipelines are subjected to combined internal pressure, soil load, and traffic live load, which may increase structural stresses and affect pipeline integrity. Therefore, stress analysis is required to ensure that the pipeline complies with the allowable stress limits specified by applicable design standards. This study aims to analyze the stress distribution of an API 5L Grade X65 steel pipeline coated with Three Layer Polyethylene (3LPE) at a highway crossing using the Finite Element Method (FEM) implemented in ANSYS Static Structural, based on ASME B31.4 and API RP 1102. The results indicate that the maximum equivalent (von Mises) stress is 202 MPa, which is lower than the allowable stress of 322.67 MPa, with a safety factor of 1.9. The comparison between the FEM simulation and the analytical calculation shows a difference of approximately 10.44%, indicating good agreement between the two methods. Therefore, the 3LPE-coated pipeline design at the highway crossing is considered safe and complies with the applicable design standards under operating conditions.
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