Anchoring (Bridge management) Flashcards
State 4 possible reasons for anchoring
- Sheltering due to stress of weather
- No berth available
- Insufficient water to proceed
- Mechanical failure
What is the length of a shackle?
27.432m (27.5m)
What should be the length of chain in calm conditions for temporary anchoring?
3 times the distance from bow roller to seabed
What should the length of cable be in normal conditions?
3 times of the normal water depth plus 90 metres
How many shackles should there be for a depth of 25 metres (normal conditions)?
6
What should the cable length be in rough weather conditions?
4 times the water depth plus 150 metres
What is the brake anchor designed to do? (2)
- Control the cable when in motion
- Take a static load on the cable
What is the anchor brake NOT designed to do? (2)
- Arrest the motion of the vessel
- Hold the mass of the vessel
In what position is the motor designed to lift the anchor and four shackles?
Vertical lift
What is the anchor motor not designed to do?
Haul the vessel forward
What is the maximum permitted anchoring depth?
82 1/2 metres
At what rate must the windlass be cable of recovering the cable at?
9 metres per minute
List the ten steps required in clearing anchors.
- 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”
List the ten steps required when preparing to anchor.
- 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
List the eight steps required for anchoring.
- 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
Should the vessel be stopped over the ground before or after letting go?
Before
At the point of letting go, the vessel should be travelling slightly in one direction. Which direction and at what speed?
Sternway, no more than half a knot
List the seven steps required for securing anchors.
- 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”
Range cable
Lay cable out on deck
Render cable
Apply brake lightly to permit cable to pay out under load
Snub cable
Stop cable running out by use of brake
Surge cable
Allow cable to run freely
Veer cable
Pay out under power
Growing
How the cable is leading
