Baskara, Naufal Arif (2026) Analisis Stabilitas Dan Perilaku Dinamis Pada Operasi Wet Tow Unit Jack-Up. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kegagalan sistem towing dan hilangnya stabilitas (loss of stability) Jack-Up yang ditarik merupakan risiko fatal dalam transportasi lepas pantai. Penelitian ini menyajikan analisis kelayakan operasi wet tow pada unit Jack-Up yang dilakukan dari Batam menuju Selat Madura dengan mempertimbangkan tiga kondisi sarat kaki (Loading Condition) saat dihadapkan pada cuaca ekstrem dari seluruh segmen pelayaran yaitu perairan Selat Karimata. Metodologi yang digunakan mencakup analisis stabilitas menggunakan software MOSES untuk verifikasi kriteria stabilitas menurut IMO A.1023, serta simulasi numerik time-domain dengan menggunkan software OrcaFlex untuk mengevaluasi interaksi hidrodinamika arus dan gelombang difraksi terhadap tegangan tali dan olah gerak struktur. Hasil analisis menyimpulkan empat temuan utama. Pertama, struktur diklasifikasikan bersifat kaku (stiff) dengan Initial GM > 20 meter, sehingga melampaui seluruh kriteria stabilitas intact dan damage. Kedua, ketersediaan kapasitas Continuous Bollard Pull sebesar 235 ton divalidasi melebihi kebutuhan daya tarik total (Total Pull Required). Ketiga, terdapat kondisi dimana tegangan pada tali penarik utama (Main Wire) tidak memenuhi safety factor saat bermanuver di kecepatan 5 knot melawan gelombang depan (180° dan 135°), yang menghasilkan nilai SF 1.4 yang mana nilai tersebut di bawah standar DNV ST-N001 (SF >2.00). Mitigasi operasional melalui reduksi kecepatan menjadi 3 knot dilakukan untuk mengeliminasi lonjakan beban ekstrem tersebut. Keempat, respons gerak rotasional (Roll dan Pitch) tercatat bernilai sangat minim yaitu < 1°, yang secara empiris memvalidasi bahwa inersia massa air lambung Jack-Up bekerja sempurna dengan kekakuan hidrostatiknya sehingga mencegah kemiringan dinamis secara berlebih.
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Towing system failure and the loss of stability of a towed Jack-Up rig are considered fatal risks in offshore transportation. This study presents an analysis on the safety of a wet tow operation for a Jack-Up unit transported from Batam to the Madura Strait. The evaluation accounts for three variations of leg draft (Loading Conditions) when subjected to extreme weather conditions from the most critical segment of the route, namely the Karimata Strait. The methodology encompasses stability analysis using MOSES software to verify stability criteria in accordance with IMO A.1023, alongside time-domain numerical simulations using OrcaFlex software to evaluate the hydrodynamic interactions of currents, winds, and diffracted waves on towline tension and structural motion response. Results of the analysis conclude four major findings. Firstly, the structure could be classified as highly stiff with the Initial GM > 20 meters, thus exceeding all intact and damage stability criteria. Secondly, the availability of a Continuous Bollard Pull capacity of 235 tons is validated to exceed the Total Pull Required. Thirdly, there is a critical condition where the tension on the Main Wire fails to meet the required safety factor when maneuvering is performed at a speed of 5 knots in the head propagating waves (180° and 135°), resulting in an SF of 1.4, which falls below the DNV ST-N001 limit (SF > 2.00). An operational mitigation through speed reduction to 3 knots is successfully implemented to counter act such extreme load surges. Forthly, the rotational motion responses (Roll and Pitch) are recorded at profoundly low values of < 1°, which empirically validates that the water mass inertia of the Jack-Up hull works appropriately in conjunction with its hydrostatic stiffness, thereby preventing excessive dynamic inclinations.
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