Analisis Intact Stability pada Crane Barge terhadap Pengaruh Pembebanan saat Operasi Heavy Lifting : Studi Kasus XYZ Crane Barge

Dalam operasi lifting struktur jacket tahap instalasi, perubahan posisi beban lifting pada floating crane barge mempengaruhi stabilitas kapal secara signifikan. Perubahan stabilitas dalam operasi heavy lifting ini harus dianalisis untuk mencegah terjadinya kegagalan operasi. Dalam penelitian ini dilakukan analisis intact stability dari crane barge ketika lifting struktur topside tahap instalasi. Analisis dilakukan dalam kondisi beban lifting struktur diatas udara dengan variasi konfigurasi pembebanan dari arah samping hingga ke depan kapal. Didapat hasil stabilitas Crane Barge untuk keseluruhan variasi sudut putar dalam kondisi operasi pengangkatan struktur, baik dengan metode analitik maupun numerik telah memenuhi ketentuan IMO dengan kondisi ekstrem terjadi pada loadcase 8 dengan nilai GZ maksimum sebesar 2,904 m pada sudut 22 derajat dan luasan area sebesar 103, 894 m.deg. Perbandingan hasil stabilitas floating crane barge saat operasi pengangkatan struktur dengan metode analitik dan numerik menunjukkan hasil bahwa keseluruhan nilai error validasi perhitungan telah memenuhi ketentuan sebesar ±5% sesuai peraturan Rules for Building and Classing Mobile Offshore Units (ABS, 2018). Sedangkan apabila digunakan koreksi perubahan momen beban lifting pada perhitungan stabilitas dengan metode analitik, nilai error terhadap analisis numerik akan bertambah besar seiring dengan pertambahan sudut heeling kapal terutama pada sudut heeling 40 derajat keatas untuk seluruh loadcase. ================================================================================================================================ During installation phase of the jacket structure lifting operation, changes in the position of the lifting load on the floating crane barge significantly affect the stability of the vessel. The changes in stability during this heavy lifting operation must be analyzed to prevent operational failures. This study conducted an intact stability analysis of the crane barge during the installation phase of lifting the topside structure. The analysis was performed under the condition of the lifting load above the air with various loading configurations from the sideways to the front of the vessel. The stability results of the Crane Barge for all variations of the rotational angle in the structural lifting operation, both through analytical and numerical methods, have met the IMO requirements. The extreme condition occurred in load case 8, with a maximum GZ value of 2.904 m at a 22-degree angle and an area of 103,894 m.deg. The comparison of the stability results of the floating crane barge during the structural lifting operation using analytical and numerical methods indicates that the overall validation error values have met the ±5% requirement according to the Rules for Building and Classing Mobile Offshore Units (ABS, 2018). However, when considering corrections for changes in the lifting load moment in the stability calculation using the analytical method, the error values relative to the numerical analysis increase significantly as the heeling angle of the vessel increases for all load cases