Modification of the Cooling System for Fin Stabilizer KD Lekir

The Fin Stabilizer system for KD LEKIR was designed by Blohm+Voss Industries with model simplex complex type FK serves to stabilize the ship (platform) for the use of helicopters (landing/starting) and weapons. It dampens the ship's rolling motion with the rough sea (partly by waves and wind). The operation is separated into 2 parts: the mechanical parts and electrical parts. When operating the system, the hydraulic oil supporting the seawater cooling system is overheats, with the temperature rise to 60°C after 30 minutes. At that temperature, the supply to the hydraulic motor has been cut off for safety purposes. During all systems running, seawater supply from the pump to the Fin stabilizer cooler is suspected of insufficient pressure and flow rate based on the reference maintenance book. To overcome the problem, the suggestion is to resize the cooling pipe and increase pump capacity or new independent design piping because the seawater cooling system shares a stem tube cooling line and controllable propeller pitch (CPP) cooling line. The method to overcome the problem can be separated by physical inspection and analysis documentation. Physical inspection is based on the flow rate meter and physical check. Based on the physical inspection, the analysis can be done manually by calculating the seawater flow rate, optimum size pipe, and suitable pump. The approval based on calculation can be identified using pipe flow software. The outcome of this problem, the fin stabilizer can sustain the temperature below 60°C then the system is running.

Sistem Penstabil Sirip bagi KD LEKIR telah direka oleh Blohm+Voss Industries dengan model simplex complex jenis FK berfungsi untuk menstabilkan kapal (platform) untuk kegunaan helikopter (pendaratan/permulaan) dan senjata. Ia digunakan untuk meredam gerakan bergolek kapal dalam keadaan laut yang bergelora. Pengoperasian sistem ini boleh dibahagikan kepada 2 bahagian, iaitu mekanikal dan elektrikal. Semasa mengendalikan sistem, minyak hidraulik yang menyokong sistem penyejukan air laut telah panas dengan kenaikan suhu kepada 60°C bagi tempoh 30 minit. Pada suhu tersebut, bekalan kuasa kepada sistem motor hidraulik telah terputus bagi tujuan keselamatan. Semasa melaksanakan pengoperasian kepada semua sistem, bekalan air laut dari pam ke penyejuk penstabil Fin disyaki bertekanan rendah dan kadar aliran air tidak mencukupi. Untuk mengatasi masalah tersebut, saiz paip penyejuk perlu diubahsuai bagi meningkatkan kapasiti pam atau melaksanakan laluan baharu kerana sistem penyejukan air laut berkongsi dengan sistem penyejukan sterntube dan sistem penyejukan controllable propeller pitch (CPP). Analisis dilakukan berdasarkan kadar aliran air laut dan pemeriksaan fizikal dilaksanakan seperti kakisan pada paipr Hasil daripada penyelidikan ini, penstabil sirip boleh mengekalkan suhu di bawah 60°C kemudian sistem beijalan.