Sunday, April 10, 2011

Ground Tackle Details for PCTC


About 10 shots of anchor chain from a PCTC

A few details about the ground tackle of a 6500 unit PCTC (Pure Car Truck Carrier or informally a car carrier) - a 200 meter ship

On all ships the term ground tackle refers to a vessel's anchors, chain and windlass.

The anchor:  The anchor type is AC-14    The weight is about 8 tons

AC-14 Anchor
The chain: The chain consist of links, the type of link is called stud link, the size, which is the diameter of the wire used to form the links is 81mm.   The length of an anchor chain is measured in shots. One shot is 15 fathoms or 90 feet (27.4 meters).

Ship's anchor chain ranged out onto the drydock

The port anchor chain is 11 shots - 990 feet or about 300 meters  - total weight is 44 tons.
The starboard anchor is 10 shots - 900 feet or about 274 meters - total weight is 40 tons.

The weight of a 81mm diameter chain is 0.144 tons/meter - the weight of each shot therefore is 4 tons.

Each shot is connected by a connecting link.
Connecting Link
The connection between the chain and the anchor includes a swivel, an end link and a bending shackle
The Anchor shackle and bending shackle
Global Security has a web page with good details here.

The Swivel

The windlass: There are two separate,   hydraulically powered  windlass, one  for each side, the windlass is capable of recovering the chain at a rate of about 1 shot (90 feet)  in three minutes.

Scope refers to the amount of chain used at anchor - that will be the next post: Scope - Amount recommended for anchoring.



CAPT. D. Peter Boucher, Dip. LA., MN (Ret.) said...

Excellent description and explanation in non-US vessels the term 'shackle' is more used than 'shots' other than that all is the same.

Good Watch.

Ken E. Beck said...

Capt Boucher - Thank you for your kind comments, it is appreciated. You're right of course about the terminology, I hadn't thought of it.

Anonymous said...

Note that the anchor-shackle type-D is the wrong way. The bolt should go through the crownshackle installed on anchors shank.

But its a common mistake :)

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Superb explanation as well as description within non-US yachts the word 'shackle' is actually much more utilized compared to 'shots' apart from that just about all may be the exact same.

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