Syah, Bertha Mahendra (2026) Analisis Tegangan Lokal Pada Subsea Protection Frame Akibat Beban Drop Anchor Dengan Variasi Beban Anchor. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Subsea Protection Frame berfungsi melindungi fasilitas produksi bawah laut dari beban aksidental, salah satunya drop anchor. Penelitian ini bertujuan menganalisis respons lokal Subsea Protection Frame akibat variasi beban jangkar sebesar 1.92 ton, 2.10 ton, dan 3.06 ton pada tiga posisi impak untuk mengevaluasi tegangan, deformasi, dan potensi kerusakan terhadap 16-inch jumper spool. Gaya impak dihitung menggunakan pendekatan kesetimbangan energi dengan mempertimbangkan terminal velocity, kemudian diterapkan sebagai beban statik ekuivalen. Analisis dilakukan secara bertahap menggunakan SACS untuk memperoleh respons struktur global dan perangkat lunak metode elemen hingga untuk mengevaluasi respons lokal. Hasil penelitian menunjukkan bahwa posisi impak P1 menghasilkan respons paling kritis dengan hot spot stress maksimum sebesar 537.43 MPa, melampaui Specified Minimum Tensile Strength (SMTS) material API 5L X65 sehingga berpotensi menyebabkan kegagalan lokal. Sementara itu, posisi impak P2 dan P3 menghasilkan tegangan yang lebih rendah meskipun pada beberapa kondisi masih melebihi Specified Minimum Yield Strength (SMYS) dan mengindikasikan deformasi plastis lokal. Namun, deformasi maksimum Subsea Protection Frame pada seluruh skenario masih berada di bawah jarak bebas terhadap jumper spool, sehingga tidak terjadi kontak langsung maupun kerusakan pada pipa yang dilindungi. Hasil penelitian menunjukkan bahwa Subsea Protection Frame masih mampu mempertahankan fungsi proteksinya terhadap beban drop anchor yang dianalisis.
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A Subsea Protection Frame (SPF) is designed to protect subsea production facilities from accidental loads, including dropped anchors. This study aims to investigate the local structural response of a Subsea Protection Frame subjected to anchor impact loads of 1.92, 2.10, and 3.06 tonnes at three different impact locations by evaluating stress, deformation, and the potential damage to a 16-inch jumper spool. The impact force was calculated using an energy balance approach considering the anchor's terminal velocity and then applied as an equivalent static load. The analysis was carried out sequentially using SACS to obtain the global structural response and finite element software to evaluate the local structural response. The results indicate that impact location P1 produced the most critical response, with a maximum hot spot stress of 537.43 MPa, exceeding the Specified Minimum Tensile Strength (SMTS) of API 5L X65 steel, indicating the potential for localized structural failure. Meanwhile, impact locations P2 and P3 resulted in lower stress levels, although several loading scenarios still exceeded the Specified Minimum Yield Strength (SMYS), leading to localized plastic deformation. However, the maximum deformation of the Subsea Protection Frame remained below the clearance distance to the jumper spool in all loading scenarios, preventing direct contact and damage to the protected pipeline. These findings demonstrate that the Subsea Protection Frame is capable of maintaining its protective function under the analyzed dropped-anchor loading conditions.
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