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Uni > Anchoring (Bridge management) > Flashcards

Anchoring (Bridge management) Flashcards

1
Q

State 4 possible reasons for anchoring

A
  • Sheltering due to stress of weather
  • No berth available
  • Insufficient water to proceed
  • Mechanical failure
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2
Q

What is the length of a shackle?

A

27.432m (27.5m)

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3
Q

What should be the length of chain in calm conditions for temporary anchoring?

A

3 times the distance from bow roller to seabed

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4
Q

What should the length of cable be in normal conditions?

A

3 times of the normal water depth plus 90 metres

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5
Q

How many shackles should there be for a depth of 25 metres (normal conditions)?

A

6

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6
Q

What should the cable length be in rough weather conditions?

A

4 times the water depth plus 150 metres

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7
Q

What is the brake anchor designed to do? (2)

A
  • Control the cable when in motion
  • Take a static load on the cable
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8
Q

What is the anchor brake NOT designed to do? (2)

A
  • Arrest the motion of the vessel
  • Hold the mass of the vessel
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9
Q

In what position is the motor designed to lift the anchor and four shackles?

A

Vertical lift

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10
Q

What is the anchor motor not designed to do?

A

Haul the vessel forward

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11
Q

What is the maximum permitted anchoring depth?

A

82 1/2 metres

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12
Q

At what rate must the windlass be cable of recovering the cable at?

A

9 metres per minute

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13
Q

List the ten steps required in clearing anchors.

A
  • Request power/steam on deck
  • Remove any lashings from the locker
  • Check brakes on and out of gear
  • Test run windlass in heave and veer
  • Remove Spurling pipe and hawse pipe covers, and check for debris in the pipes
  • Working one anchor at a time, engage gear, ease brake and take weight of cable
  • Remove devils’ claw, cross lashings etc, but NOT
    compressors or guillotines
  • Screw up tightly on brake and disengage gear
  • Re-check that the windlass turns freely
  • Inform bridge “Anchors cleared”
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14
Q

List the ten steps required when preparing to anchor.

A
  • Check communications
  • Check cable locker (s)
  • Check over side and confirm which anchor is to be used
  • Engage gear and release brake to take the weight
  • Remove compressor
  • Veer cable until anchor clear of hawse
  • Brake on
  • Disengage gear
  • Report to bridge “Port/Starboard anchor outside the pipe ready for letting go”
  • At the order “Let go”, double check over the side before easing the brake
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15
Q

List the eight steps required for anchoring.

A
  • Surge cable until about twice the depth has run through the hawse
  • When the anchor touches the bottom, raise the anchor ball/light
  • Apply the brake lightly to render the remaining scope
  • Ship speed is critical at this stage
  • Ring the bell to denote the number of shackles out
  • Communicate/indicate direction of lead and stay
  • Snub cable when desired number of shackles have been paid out
  • Wait for the vessel to take her cable
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16
Q

Should the vessel be stopped over the ground before or after letting go?

A

Before

17
Q

At the point of letting go, the vessel should be travelling slightly in one direction. Which direction and at what speed?

A

Sternway, no more than half a knot

18
Q

List the seven steps required for securing anchors.

A
  • Check brakes on and windlass out of gear
  • Check compressors on
  • Put on devils’ claw and/or other devices
  • Place lashings on cables if required
  • Put on any hawse pipe covers
  • Secure the Spurling pipes
  • Report to bridge “Anchors secure for sea”
19
Q

Range cable

A

Lay cable out on deck

20
Q

Render cable

A

Apply brake lightly to permit cable to pay out under load

21
Q

Snub cable

A

Stop cable running out by use of brake

22
Q

Surge cable

A

Allow cable to run freely

23
Q

Veer cable

A

Pay out under power

24
Q

Growing

A

How the cable is leading

25
Q

Short stay

A

Little weight, almost vertical

26
Q

Long stay

A

Taut and almost horizontal

27
Q

Brought up

A

Anchor holding and cable has good catenary

28
Q

Catenary

A

A curve of hyperbolic function

29
Q

Shorten in

A

Reduce the amount of scope

30
Q

Scope

A

Amount of cable used

31
Q

Term when vessel twists 180 degrees around its own cables.

A

Cross

32
Q

Term when vessel twists 360 degrees around its own cables.

A

Elbow

33
Q

Term when vessel twists 540 degrees around its own cables.

A

Cross and elbow

34
Q

Term when vessel twists 720 degrees around its own cables.

A

Round turn

Uni (8 decks)

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