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NEI > Steering > Flashcards

Steering Flashcards

1
Q

Purpose

A

The steering system is an electronically controlled, hydraulically actuated system which quickly and accurately positionins a single spade rudder in response to a helm demand and holds the rudder at that position IOT provide control over the ships heading.

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2
Q

Sump Tank

A

800L sump tank

stores hydraulic oil

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3
Q

Steering Gear Pump

A

Positive displacement, double vane, electric motor driven pump.

Draws oil from its respective sump tank to be delivered to the RVA.

1800 rpm
250 bar
420 L/min

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4
Q

Acoustic Silencer

A

Creates a more laminar flow of oil IOT reduce pulsation, vibration, and noise.

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5
Q

Duplex Filters

A

10 micron mesh filters

Provides filtration of hydraulic oil.

Both banks are used so changing the filter elements requires the entire Duplex filter be offline.

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6
Q

3 Port Pressure Compensator Valve

A

A pressure relief valve,

Relieves pressure between 12-165 bar depending on the severity of the rudder angle movement.

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7
Q

Proportional Control Valve

A

Hydraulic interface between RVA and main power unit.

Recieves a constant flow of hydraulic oil at system pressure and delivers a proportion of that flow on demand.

PCV shuttles left or right by solenoid.

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8
Q

Cooler

A

A shell and tube type heat exchanger,

reduces the temperature of the oil as it returns to the sump

ASWC in tubes at 90 L/min
Oil in shell at 160 L/min

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9
Q

Rotary Vane Actuator (RVA)

A

Consists of a steel casing and a rotor.
Casing has 3 chambers.
Rotor has 3 flanges.
Making 6 hydraulic oil galleries.

Provides torque required to rotate the rudder to the desired angle.

Maximum physical angle: 37 degrees.
Maximum allowable angle: 36.5 degrees.
Maximum working angle: 35 degrees.

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10
Q

Limit Switch

A

Is a physical arm and switch on top of the RVA

Limits the rotor to a maximum angle of 36.5 degrees so that physical contact between the rotor and RVA casing does not occur.

36.5 degrees
140 bar pressure relief valves.

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11
Q

Rudder Centering Unit

A

Consists of:

Positive displacement, single vane pump to provide pressure.

Strainer.

Pressure switches (145 bar to 165 bar).

5x accumulator flasks cointaing nitrogen bladders compressed by hydraulic oil.

Provides a means of centering the rudder in caase of total power loss.

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12
Q

Hand Pump

A

It is a fixed displacement axial piston pump

affects small rudder angle movements in the event that the Rudder Centering Unit does not fully center the rudder.

7 full rotations for 1 degree of rudder angle movement.

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13
Q

Locking Pin

A

A steel locking pin with a magnetic interlock

Physically prevents the rudder from being moved.
Magnetic interlock prevents commands being sent to the steering system.

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14
Q

PSP

A

Cable of Auto, FU, NFU, Center

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15
Q

SSP

A

Capable of FU, NFU, Center

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16
Q

ESP

A

Capable of NFU, Center

17
Q

ESP Selector Switch

A

ESP will have control when in LOCAL.
SSP or PSP will have control when in REMOTE

18
Q

SSP Selector Switch

A

SSP will have control when ESP in REMOTE and SSP in SSP

PSP will have control when the ESP in REMOTE and SSP in BRIDGE

19
Q

Steering Control Unit

A

Interface for electrical commands to hydraulic subsystem.

Uses a closed feedback loop.

Located in ESP.

20
Q

Modes of Operation (List)

A

AFU
HFU
HNFU
Manual
Centering

21
Q

Automatic Follow-Up (AFU)

A

Rudder angle movements are performed automatically according to a pre-set course.

Not used due to excessive rudder movements causing overheating and premature wear of ocmponents.

Only available at the PSP.

22
Q

Hand Follow-Up (HFU)

A

Helmsan manually sets rudder demand. Steering system actuates rudder using feedback control.

Available in PSP and SSP.

23
Q

Hand Non-Follow Up (HNFU)

A

Helmsman manually sets rudder angle using push-buttons. There is no feedback loop.

PCV is either all the way open or all the way closed so changes are abrupt.

Available from PSP, SSP, ESP.

24
Q

Manual NFU

A

Helmsman can use spring manual override buttons on the PCV.

25
Q

Centering

A

If Spring Manual Override buttons do not work, accumulator bottles will center the rudder and a locking pin is insterted.

26
Q

Operational Description

A

Go through the system from order a helm demand in Hand Follow-Up to the rudder moving and turning the ship. Follow the flow of oil.

27
Q

Where are the Rudder Angle Indicators (RAIs)

A

Bridge
Ops ROom
Bridge Wings
Steering Gear Compartment
SSP
PSP

28
Q

System Interfaces

A

EPG&D
MSWC
IPMS

29
Q

Redundancy and Survivability

A

Multiple steering systems.
Multiple steering positions.
Multiple steering modes.
Mutliple steering channels.
UPS.
Steer by main engines.
Geographical dispersion.
Limit Switch

30
Q

What oil?

A

3-GP-36M

NEI (15 decks)

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