Operação de Instalações Marítimas

Transcrição

1 ENIDH, Abril 2011

2 Sumário 1 Steering Gear 2 Bow Thrust 3 Propeller Servo

3 1 Steering Gear 2 Bow Thrust 3 Propeller Servo

4 Steering Gear System Comprises two identical hydraulic systems. Each system includes: one steering gear pump unit comprising; oil tank with a bottom drain valve; steering gear pump of the fixed displacement type; return line oil filter; level indication; monitoring equipment; one control valve block assembly; necessary measuring, indication and alarm facilities for pressure, temperature, level and flow; necessary control and safety equipment; one expansion tank common to both hydraulic systems; emergency steering control equipment; rudder angle indication.

5 Steering Gear System

6 Safematic system Both steering gear are connected to the expansion tank; A major oil leak at one of the systems will lead to a LOW LEVEL ALARM - EXPANSION TANK; If the oil level continues to decrease, stand-by steering gear pump receives a START command; If the expansion tank oil level is still decreasing, it will reach the level where the expansion tank is split up into two chambers; Each steering gear system is now supplied from its own expansion tank chamber and the decrease in oil level will only take place in the chamber connected to the defective system; A low level switch in the chamber in question stops the respective steering gear pump and shifts the safematic control valve block into a position where: the two system are separated from each other; the steering gear chambers connected to the defective system are by-passed (short-circuited); After the separation the defective system will be shut down (pump stops, control valve block will close).

7 Bridge Steering Gear Control

8 ECR Steering Gear Control

9 1 Steering Gear 2 Bow Thrust 3 Propeller Servo

10 Bow Thrust and Deck Machinery

11 Bow Thrust and Deck Machinery

12 1 Steering Gear 2 Bow Thrust 3 Propeller Servo

13 Propeller Servo Oil Description The propeller pitch servo is operated by high-pressure hydraulic oil supplied by two electrically driven pumps; Usually only one pump is used with the other in stand-by mode; The pitch control is dependent on hydraulic pressure; At low oil pressure, the maximum rate of pitch change is reduced correspondingly; The pressure is controlled by bypassing oil through the pressure control valve; Default pressure is 45 bar; The return oil is cooled by LT fresh water and is controlled to be 45 C; The oil drains to the servo oil tank.

14 Propeller Servo Oil System

15 Propeller Servo Oil Operation Starting procedure: Main engine sea water system and LT fresh water system must be in service; Open fresh water inlet valve to servo lubricating oil cooler; Open selected filter inlet valve; Check level in Servo Oil Tank; Select Local or Remote Pitch Control; Start the lubricating oil pump locally or from the PowerChief Pump Control Panel; Put the lubricating oil pumps into AUTO mode on the Panel.

16 Sumário 1 Steering Gear 2 Bow Thrust 3 Propeller Servo