In an emergency, which can directly control the electro-hydraulic steering units on the vessel?
• Electro-hydraulic steering system layout – which component is actually connected to the hydraulic rams/valves in an emergency • Difference between automatic/follow-up control and local/emergency manual control • What equipment is normally located in the steering gear room for emergency use
• First, picture the steering system from wheel on the bridge to the rudder stock. Which device is normally bypassed when you lose normal bridge control? • Ask yourself: in an emergency, where must the helmsman (or engineer) go to operate the steering locally, and what is that device called? • Which option sounds like a local manual control of the hydraulic gear, and which sound like parts of the normal automatic/follow-up system?
• Verify which device is physically in the steering gear room and can move the rudder if the bridge system fails • Check which items are part of the remote follow-up control circuit (those are not the direct emergency control) • Be sure the option you pick would allow control of the hydraulic telemotor or servo valves even if the bridge steering wheel and control circuits are dead
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