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Intro to Marine Engineering 2E Episode 9

Tham khảo tài liệu 'intro to marine engineering 2e episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 230 Steering gear the actuator. The self closing valves are fined on the inlet and outlet ports of the actuator and open under oil pressure against the action of a spring. Where an oil pressure loss occurs in one circuit the valves will immediately dose under the action of their springs. A low tank level alarm will sound and the other pump can be started. This pump will build up pressure open the valves on its circuit and the steering gear can immediately operate. Steering gear testing Prior to a ship s departure from any port the steering gear should be tested to ensure satisfactory operation. These tests should include 1. Operation of the main steering gear. 2. Operation of the auxiliary steering gear or use of the second pump which acts as the auxiliary. 3. Operation of the remote control telemotor system or systems from the main bridge steering positions. 4. Operation of the steering gear using the emergency power supply. 5. The rudder angle indicator reading with respect to the actual rudder angle should be checked. 6. The alarms fitted to the remote control system and the steering gear power units should be checked for correct operation. During these tests the rudder should be moved through its full travel in both directions and the various equipment items linkages etc. visually inspected for damage or wear. The communication system between the bridge and the steering gear compartment should also be operated. _- Chapter 13 Fire fighting and safety Fire is a constant hazard at sea. It results in more total losses of ships than any other form of casualty. Almost all fires are the result of negligence or carelessness. Combustion occurs when the gases or vapours given off by a substance are ignited it is the gas given off that burns not the substance. The temperature of the substance at which it gives off enough gas to continue burning is known as the flash point . Fire is the result of a combination of three factors 1. A substance that will