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  • Whats up everyone Today lets do anchoring

  • Drop port anchor!

  • HWAT?!

  • So theres alot types of anchor out there, the most common type now days on merchant

  • navy ships, especially large ships, are the stockless type.

  • And that's mainly because the design is flat and can be stored away easily.

  • Usually you'll see it tucked away just beneath the bow.

  • This one here is our spare anchor.

  • A typical stockless type will have its crown, the arms and the flukes in one piece, its

  • design to pivot on the shank. The shank is the term for the center piece.

  • Contraty to many believe... the anchor actually dont hold the ship, the anchor only digs into

  • the sea bed and holds the chain.

  • Its the length and weight of the chains that holds the ship.

  • Its all about horizontal force , later I will show you guys how it works.

  • Now At the forward station we've got two anchors , one on each side which can be lowered or

  • heave up control by the windlass.

  • The anchor chain leads up to the hawse pipe through the windlass, down the spurling pipe

  • into the chain locker where its stored.

  • Here is the chain locker, normally its kept closed but today I was following chief mate

  • for an visual inspection.

  • The big drum is called the Gypsy.

  • Some item of interest here are the guillotine bar, also known as bow stopper or pawl bar.

  • which traps and holds the chain in place, incase the brake fails.

  • The metal wire attached are the lashing holding it in place when not in use.

  • By putting the dog clutch into gear, we can either heave up or lower the anchor.

  • Windlass is the term for this whole system used to heave up or lower anchor and mooring

  • lines.

  • The anchor alone is about 9000kgs or 20,000 lbs, plus the chains thats quite heavy, which

  • is why using the windlass its still a slow process.

  • Heaving up is always going to be slow, But for lowering the anchor there is actaully

  • another way , a faster way which is to let the anchor fly out.

  • What that means is having the anchor chain disengaged from dog clutch and brakes, and

  • lowered by gravity.

  • The only way to stop it though is by engaging the brakes.

  • Here is what it looks like.

  • As you can see it is quite violent, lots of vibration, debris flying everywhere, and a

  • lot more risky then by motors.

  • If you aren't careful this might happen.

  • If we still have the anchor, well brakes on tight, bar down and pin in, securing the anchor

  • So how do the anchor, anchor chains hold the ship in place?

  • Well remember the keyword is horizontal forces.

  • Casey Nesitat time Let me show you from the begining

  • The ship should always be down wind or down current whichever is stronger, slightly drifting

  • backwards . so that when a anchor is lowered into the water, the crown catches and set

  • onto the sea bed. with the engine and or the current, walking the ship back to pay out

  • the chains.

  • A useful trick to figure out the current or tidal direction is simply just look at the

  • nearby anchored ships, all anchored ship will follow the heading of current.

  • A horizontal pull gives the anchor its holding power digging into the sea bed.

  • The weight of the chain, this curve section also known as the catenary, holds the ship.

  • So the more chain laid, the greater the holding power

  • A general rule of thumb is 1:5 ratio for good weather, 1:7 or more for bad weather.

  • It varies between ship size and type.

  • For deck officers, An anchor circle should be drawn with the radius being the length

  • of cables laid plus from bow to radar antenna so that you can monitor the ship on radar

  • and ecidis.

  • So we drop our anchor plus how many cables we laid out plus the ship's length

  • see this is the anchor circle on the outside, and this our track, past position swings back and forth because

  • the tidal wave is semi-durinal

  • Dont forget to show the anchor ball & signal ! Anchor light

  • During anchor watches, the crew have to check the weather and sea conditions

  • as well as status of the chain.

  • We want avoid dragging the anchor and drift somewhere or drift into another ship, that

  • would be bad...

  • The crew will look at the chain phsyically and report back.

  • The terms we use are.

  • up'n'down, short stay, medium stay or long stay. Long stay means there is a high chance

  • of dragging anchor because the chain is being pulled like this.

  • To heave up, just walk the ship over the anchor and pull up with the windlass because remember

  • it's not designed to hold vertical forces.

  • How do you count anchor chain?

  • Well, in the old days, every length of cable is marked between the shackles, one shackle

  • is about 27.5 meters.

  • Nowdays modern ships we have gauges that show how many chains are laid.

  • If you got any questions about anchoring, make sure to comment down below and join the

  • discussions.

  • Smash that subscribe button and hit me up on instagram, see you next time

Whats up everyone Today lets do anchoring

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如何在大型船舶上起錨|起錨和設備說明! | 海上生活 (How To Anchor a Mega-Ship | Anchoring & Equipment Explained! | Life at Sea)

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    吳易晉 發佈於 2021 年 01 月 14 日
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