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.

Anchor ship

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

equipment number

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.

Anchor length

 

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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Capt Rajeev Jassal

About Capt Rajeev Jassal

Capt. Rajeev Jassal has sailed for over 19 years mainly on crude oil, product and chemical tankers. He holds MBA in shipping & Logistics degree from London. He has done extensive research on quantitatively measuring Safety culture onboard and safety climate ashore which he believes is the most important element for safer shipping.

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19 Comments

mohamed sharif saleh
mohamed sharif saleh
Sep 25, 2016

Good Day you always bright star Capt Rajeev Jassal

Rajeev Jassal
Rajeev Jassal
Sep 26, 2016

Thanks for the good words Mohamed..

VIKAS V MISHRA
VIKAS V MISHRA
Sep 27, 2016

but sir where do we find the length of the chain is mentioned...? i mean there must be a certificate for this ?????

Rajeev Jassal
Rajeev Jassal
Sep 29, 2016

There is no certificate required for this. The number of shackles onboard is mentioned in the manoeuvring booklet and wheelhouse poster.

Drake
Drake
May 9, 2017

One more reason of y d anchor chain is different on port at starboard is because of open sea mooring

Amin
Amin
Oct 18, 2016

Hi dear sir would you please explain the ( B ) in the formula?

NAVNEET KUMAR
NAVNEET KUMAR
May 11, 2019

It is Breadth Moulded.

pritam
pritam
May 14, 2017

Apart from the usefull information u had provided above i have two querry sir. 1 ) why port anchor have 10 shackle and stbd 9 shackle 2) why stbd anchor is called weather anchor.

Neeraj giri
Neeraj giri
Nov 19, 2017

Good sir kya aap hme bhi le skte h apne ship pe

Mohan Padmanabhan Anantharaman
Mohan Padmanabhan Anantharaman
Mar 1, 2018

I learnt something new today,

Capt Jitender Sanyal
Capt Jitender Sanyal
Jun 15, 2018

You are absolutely right about equipment number. for example if the number is 13.5 then both the chains will be approx. 14 shackle in length. It is class requirement that every vessel must be given one spare shackle besides as per equipment number requirement. Since it is difficult to stow the chain in forecastle store it is connected to any one of the Anchor chain whether Port or Stbd. That is the main reason why we have different lengths of Anchor chain on all ships. Thank you and Best regards.

Le Dinh Tuan
Le Dinh Tuan
Nov 5, 2018

Its a great thing has discovered for me for long period of time. Thank you so much.

Indika Jayawickrama
Indika Jayawickrama
Feb 18, 2019

Very useful information.Thanks a lot Sir

Manish Indraksh
Manish Indraksh
Feb 4, 2020

Sir, I want to know about MBA in shipping and logistics. Can you please guide me about the institute and career prospects in this field. Right now am appearing for my 2nd mate exams but have my interest in MBA

Amar anand
Amar anand
Apr 1, 2020

Great article sir....is it necessary that always port side cable length is more ? if so what is the reason for that?

Anuradha Peiris
Anuradha Peiris
Feb 3, 2021

Thank you very much. i Really like this site. i gain lot of knowledge. Thanks again

il
il
Apr 11, 2021

thank you very useful.

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KETINA BARLEY
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