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Ship > Aft Steering > Flashcards

Aft Steering Flashcards

1
Q

What is the max Rudder travel rate?

A

5.5 degrees per second

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2
Q

What is the normal Rudder travel?

A

35 degrees

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3
Q

At what Rudder angle is the Copper Stop used?

A

37 Degrees

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4
Q

At what Rudder Angle is the Steel Stop used?

A

38 Degrees

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5
Q

Where are the Copper and Steel Collars mounted?

A

At each end of the Tie Rod

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6
Q

What happens if the Ram over travels to 37 degrees Rudder Angle?

A

The Ram Stop Block will hit the Copper Stop

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7
Q

What happens when the Copper Stop is crushed?

A

The Steel Stop will engage the Ram Stop Block

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8
Q

What are the two subsystems of the Steering Gear Machinery?

A

The Steering Gear Hydraulic Oil System and the Fill and Drain Pump Unit

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9
Q

What does the Steering Gear Machinery System do?

A

Provides mechanical advantage through the use of hydraulics to position the rudder

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10
Q

How many Hydraulic Power Units(HPU) are there?

A

2 per Rudder

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11
Q

What do the Hydraulic Power Units (HPU) do?

A

They provide hydraulic pressure to move their associated Rudders

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12
Q

How are the Hydraulic Power Units(HPU) numbered?

A

1A, 1B for Starboard and 2A, 2B for Port

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13
Q

What does the Main Pump do?

A

Supplies the high pressure oil to move the Ram Assembly

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14
Q

What kind of pump is the Main Pump?

A

Variable displacement axial piston pump

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15
Q

What is the discharge pressure for the Main Pump?

A

250-300 psig at zero Main Pump stroke and 2000-2400 psig when on stroke

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16
Q

What does the Auxiliary Servo and Replenishment pump do?

A

Supplies control oil to the main pump Control Servo Assembly and the HPU Transfer Valve

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17
Q

What kind of pump is the Auxiliary Servo and Replenishment pump?

A

Sliding vane type positive displacement pump

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18
Q

The Auxiliary Servo Replenishment pump is driven by what shaft?

A

Same shaft as the Main Pump

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19
Q

What is the normal discharge pressure for the Auxiliary Servo Replenishment Pump?

A

650-700 psig

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20
Q

What does the Auxiliary Pump provide?

A
  1. Controls the stroke of the HP pump
  2. Controls the position of the HPU Transfer Valve.
  3. Provides make-up oil to the HP oil system.
  4. Cools the Main Pump Casing.
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21
Q

What is the purpose of the HPU supply tank?

A

Provides a continuous hydraulic fluid source to the auxiliary pump inlet

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22
Q

The HPU supply tank receives temperature regulated, filtered fluid from what?

A

The main pump housing

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23
Q

Oil temperature is monitored for the following conditions:

A
  1. Oil temp fails to reach 100°F after running for an hour

2. Oil temp rises above 140°F at any time.

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24
Q

If oil temperature fails to reach 100°F after running continuously for one hour what kind of fault is it?

A

Minor Fault

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25
Q

If oil temp rises above 140°F at any time what kind of fault is it?

A

Major Fault

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26
Q

How many Hydraulic Fluid Filters per HPU Filter oil entering the HPU?

A

2

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27
Q

Filter DP High is what psid?

A

35

28
Q

Hydraulic Fluid Filters bypasses at what psid?

A

50

29
Q

Hydraulic Fluid Filters high DP causes what kind of fault?

A

Minor Fault

30
Q

What is the purpose of the Servo Pressure Switch?

A

Provides a HPU RUN signal when servo pressure exceeds 200 +/- 20 psig and a Servo oil low pressure at 200 +/- 20 psig

31
Q

What kind of fault does the Servo Pressure switch give?

A

Major Fault

32
Q

What is the Hydraulic Fluid Cooler?

A

A single-pass tube cooler which utilizes firemain as a cooling medium.

33
Q

What does the Temperature Regulating Valve do?

A

Senses Cooler inlet temp and bypasses the hydraulic oil around the Cooler when temp is below 120°F

34
Q

The Valve Block contains what?

A
  1. Servo Relief Valve
  2. Replenishment Relief Valve
  3. Two Replacement Check Valves
  4. Two Main System Relief Valves
35
Q

The Servo Relief Valve is set at what psig?

A

700

36
Q

The Replenishment Relief Valve is set at what psig?

A

200

37
Q

The Two Main System Relief valves are set at what psig?

A

2640

38
Q

What kind of Accumulator is used on the HPU?

A

A nitrogen-charged bladder-type Accumulator

39
Q

What is the purpose of the Accumulator?

A

Provides replenishment fluid during transient conditions ( large rudder movements ).

40
Q

What is the capacity of the Accumulator?

A

2.5 gallons

41
Q

What is normal capacity for the Accumulator

A

1.25 gallons

42
Q

What psig is the Accumulator charged to?

A

100

43
Q

What kind of valve is the Servo Valve?

A

Electronically operated solenoid valve

44
Q

Where is the Servo Valve located?

A

On top of the Valve Block

45
Q

What does the Servo Valve do?

A

Receives an electrical signal from the LCU and sends servo oil to the Pump Control Servo Assembly

46
Q

What does the Transfer Valve do?

A

Shifts control or the Rudder between the two HPU’s

47
Q

What is the purpose of the Head Tank Assembly?

A

Provides a positive head pressure to the Auxiliary Pump

48
Q

What is the FADPU?

A

Fill and Drain Pump Unit

49
Q

What is the Fill and Drain Pump Unit?

A

It is the fill, flushing, and transfer station for the Steering Gear Machinery and the Emergency Manual Steering Operating Station

50
Q

What are the major components of the FADPU?

A
  1. FADPU Electric Motor Driven Pump
  2. Suction Strainer (238 micron)
  3. Discharge Filter (6 micron)
  4. Discharge Selector Valve
  5. Port and STBD Steering Control Valves
51
Q

What is the Discharge Selector Valve on the FADPU?

A

A manual, three position valve used to select one of the two Ram Units

52
Q

How many Ram Units can the FADPU operate?

A

Only one Ram Unit and attached Rudder can be operated at one time

53
Q

What kind of fault does the Servo Pressure switch give?

A

Major Fault

54
Q

What is the Hydraulic Fluid Cooler?

A

A single-pass tube cooler which utilizes firemain as a cooling medium.

55
Q

What does the Temperature Regulating Valve do?

A

Senses Cooler inlet temp and bypasses the hydraulic oil around the Cooler when temp is below 120°F

56
Q

The Valve Block contains what?

A
  1. Servo Relief Valve
  2. Replenishment Relief Valve
  3. Two Replacement Check Valves
  4. Two Main System Relief Valves
57
Q

The Servo Relief Valve is set at what psig?

A

700

58
Q

The Replenishment Relief Valve is set at what psig?

A

200

59
Q

The Two Main System Relief valves are set at what psig?

A

2640

60
Q

What kind of Accumulator is used on the HPU?

A

A nitrogen-charged bladder-type Accumulator

61
Q

What is the purpose of the Accumulator?

A

Provides replenishment fluid during transient conditions ( large rudder movements ).

62
Q

What is the capacity of the Accumulator?

A

2.5 gallons

63
Q

What is normal capacity for the Accumulator

A

1.25 gallons

64
Q

What psig is the Accumulator charged to?

A

100

65
Q

What are Port and STBD Steering Control Valves?

A

Manual, three position valves used to direct oil flow to either side of the selected Ram Unit

66
Q

What is the only common connection point for the Steering Gear Machinery?

A

Storage Tank Assembly

67
Q

What does the Storage Tank Assembly do?

A

Receives oil from the FADPU Steering Control, Fill Relief, or Emergency Steering Relief Valves

Ship (1 decks)

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