In the world of the PLTU industry, the need for material, especially the need for the sapot process and conveyor repairs, occurs in the world of PLTU, which is installed on the conveyor construction and when connecting materials, different grades are often used and this often occurs in the field during the process of combining plates with different grades. on the sapote. and for installing the plate on the sappot, use grade A and the plate that is often used is the plate for the machine foundation with grade B on the sappot material using low carbon grade A steel. In this research report, welding is carried out and combined with grade A steel which is usually used for sappots. the conveyor is combined with low carbon grade B steel in the construction of the PLTU sapot. Where welding is carried out 3x why this needs to be done is because to know the characteristics of low carbon grade A steel and low carbon grade B steel, whether the characteristics are the same or not because they are used in When grade A steel material runs out in the industry, the testing process uses 3 tests, namely to determine NDT testing (Non Destructive, test), tensile testing, and micro testing for the testing process. (DonyPerdana and Ahmad Bazy Syarif, 2017).

Noise can be defined as a sound or noise that can disturb comfort and health and can cause deafness. Noise that occurs continuously with high intensity can unconsciously affect the health of the Crew (ABK) who are on duty on the ship. Health problems can occur because the ABK are required to be in the ship's engine room which can last a very long time according to the route of the ship's voyage. This study aims to determine and analyze the noise in the engine room and accommodation room on the ferry. The data analysis technique used in this study is noise measurement and analysis of measurement data. The results of the study showed that there was 1 room on the MT. Suchaonugnum ship that did not meet the standards of the Indonesian Classification Bureau and MSC.337(91), including the engine control room. The highest noise source produced in the engine room is produced by the auxiliary engine. While in the lounge room, passenger accommodation room and VIP Room the highest sound source is produced by the sound system. The sound system that is always turned on when the ship is operating is one of the sources of noise that makes the noise level in the passenger accommodation room not in accordance with the MSC.337(91) standard because the sound pressure is too high. The noise level in the passenger accommodation space can be overcome by reducing the sound pressure on the sound system.

Kapal Penunpang KM. Dharma Rucitra 9 milik PT. Dharma Lautan Utama (DLU) di wilayah Semarang mengoperasikan layanan penyeberangan Semarang-Kumai, sedangkan KM. Dharma Kartika 2 melayani layanan penyeberangan Surabaya-Banjarmasin yang disediakan pemerintah untuk masyarakat Indonesia. Terdapat beberapa skema dalam pengangkutan bahan baku antara Ship to Ship, Truck to Ship dan Onshore to Ship Pengadaan bahan baku akan dilakukan melalui skema ship to ship dan Truck to ship di wilayah penumpang, sehingga apabila terjadi kecelakaan akan mengakibatkan kerugian yang tidak sedikit, baik dari segi material maupun manusia.
Penelitian ini dilakukan dengan tujuan untuk mengetahui pengaruh pemilihan metode bunker terhadap perhitungan ROB (Quantity Remaining On Board), biaya tumpahan minyak Penelitian ini juga bertujuan menganalisis faktor yang paling dominan pengaruhnya terhadap tumpahan minyak ketika saat melakukan proses bunker. Penelitian ini menggunakan metode kuantitatif dengan menggunakan perhitungan-perhitungan ROB Soundingan – Trim = Hasil sounding, selanjutnya adalah perhitungan untuk menentukan jumlah permintaan minyak untuk bunker.   Kapasitas tangki – ROB (Sisa bahan bakar), untuk analisis biaya kasus tumpahan minyak penulis menggunakan rumus dari (W.wirtz,) yaitu sesuai Persamaan   Ln (TC) = 0,4667 x (t) + 13,894.
Berdasarkan hasil penelitian ini peneliti bisa menyimpulkan untuk kedua metode bunker sendiri tidak ada kebocoran pada saat proses bunker sehingga aman untuk pemilihan metode bunker tersebut, tetapi untuk analisis pemilihan metode bunker dapat diambil kesimpulan dari segi keamanan, teknis dan biaya metode bunker dengan menggunakan truk to ship lebih efisien, mendapat 80%, segi keselamatan truck to sehip mendapat 60% segi biaya truk to ship mendapat 60%, berdasarkan analisis perhitungan sisa bahan bakar yang telah peneliti analisis tidak ada over muatan atau kelebihan muatan yang segnifikan, Proses identifikasi risiko tumpahan minyak merupakan risiko ringan atau rendah, namun tetap harus diperhatikan dan dikendalikan untuk mengatasinya apabila terjadi risiko besar, dampak dari tumpahan ini berdampak selama 3 bulan maka kerugian yang di alami nelayan sebesar Rp. 1.240.729,- × 36 = Rp.44.666.244,- perhitungan ini hanya untuk satu nelayan sedangkan untuk penduduk pesisir pelabuhan Tanjung perak surabaya 75% berprofesi sebagai nelayan tentu saja ini menjadi kerugian yang besar bagi nelayan.