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Why Do We Sometimes Have Two Anchors of Different Cable Lengths Onboard Ships ?

Ships sometimes have anchors of different lengths to meet equipment number requirements for anchor chain length. The equipment number is calculated based on factors like a ship's size and determines the minimum required length of anchor chain. To meet this requirement, one anchor may be attached to 10 shackles of chain while the other is attached to 11 shackles, allowing the total chain length to satisfy the equipment number standard.

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Panagiotis Mouzenidis
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400 views3 pages

Why Do We Sometimes Have Two Anchors of Different Cable Lengths Onboard Ships ?

Ships sometimes have anchors of different lengths to meet equipment number requirements for anchor chain length. The equipment number is calculated based on factors like a ship's size and determines the minimum required length of anchor chain. To meet this requirement, one anchor may be attached to 10 shackles of chain while the other is attached to 11 shackles, allowing the total chain length to satisfy the equipment number standard.

Uploaded by

Panagiotis Mouzenidis
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Why do we sometimes have two anchors of different cable lengths

onboard ships ?
Written by Capt Rajeev Jassal on March 6, 2015

Ever wondered why do we sometimes have both the anchors of different lengths. It is not very uncommon to notice 10 shackles on one anchor while
11 shackles on other one. All the requirements concerning anchor onboard are formulated in the guidelines issued by International association of
international classification (IACS). These requirements include requirements for anchor weight, diameter and steel grade for the stud link of the
chain cable and the length of the anchor chain etc.

All these requirements are governed by something called “Equipment number”. If you would have seen the anchor certificate generally issued during
yard delivery of the vessel, you would find the equipment number on that certificate.

Equipment number is calculated by formula


As per the equipment number, the total length of the anchor chain is given. So if say, for a particular equipment number, the minimum length of the
cable required is 21 shackles, one side of the anchor is given 10 shackles and the other one 11 shackles. Below is the table that shows how
equipment number corresponds to the particulars of the anchors onboard.
 

Did you find this information useful ? Let your views flow in the comments below. Meanwhile wishing you all fair winds and following seas.

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