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A complete guide of bringing a ship to dry dock

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dry-docking-a-ship If you have the experience of dry-docking of a ship, you would agree that dry docking is a great experience. I personally love to be on a ship due for dry dock. After all, you get to see things that you don't see during the routine operation of the ship. I was lucky enough to get a chance to be in dry dock in each rank I have served on. I was even lucky to experience the double-hull conversion of a tanker during dry dock. But if you have not been to a dry dock, there would be one thing that might come to your mind on hearing the word Dry Dock. And that is dry dock calculation that we read in ship stability, probably during our Mate's exams. That's purely the theory part. And I believe theory without practical experience is just a theory. So here I am going to write about the practical aspect of taking a ship to dry dock. But before I proceed, in layman's terms I will summarize what we had read about dry docking in ship stability. We read and understood these things The time from "when Stern touches the blocks" to when "full ship is on the blocks" is the critical period. During the critical period, the vessel's GM reduces. This is because the vessel's 'Gravitational center G moves upwards when Stern touches the blocks. It is required and a good practice to have the least trim while docking so that the...

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Comments (124)

  • Jayraj April 11, 2016
    A wonderful explanation Sir , though I haven't got a chance to be at drydock , but I could Imagine the process .. Thanks.
    5
    Rajeev Jassal April 22, 2016
    Glad that you liked it Jayraj
    Anooj pradhan September 11, 2016
    Excellent explanation sir
  • rag May 10, 2016
    Loved your web blog and its excellent.
    1
    Rajeev Jassal May 10, 2016
    Glad that you liked it Rag..
  • Lokesh July 5, 2016
    Very informative and useful.
    1
    Rajeev Jassal July 5, 2016
    Glad you found it useful Lokesh..
  • John July 15, 2016
    Although the principal of testing a bottom plug is the same, the video above is actually a vacuum test to ensure that a transducer head (most likely an Echo Sounder) is properly sealed.
    1
    Rajeev Jassal July 16, 2016
    You are absolutely right John.
  • Sanjay Waghmode July 17, 2016
    Awesome sir, i found it very much useful during drydock of NCC ABHA. It was my first drydock.
    1
    Rajeev Jassal July 18, 2016
    Glad you found it useful Sanjay. I hope the dry dock of ABHA went all well...
  • Amin September 5, 2016
    Excellent explanation sir.
    1
    Rajeev Jassal September 7, 2016
    Glad you liked it Amin..
  • ankit vyas September 6, 2016
    sir pl post article about legal requirement during dry dock for chief mate candidates this blog is really helpful for orals
    1
    Rajeev Jassal September 7, 2016
    I will include that in one of the future blogs Ankit..
  • VS Ramamurthy September 11, 2016
    Dear Rajeev Sir: I was surfing through for Keel Blocks and types of keel blocks for dry docking, and stepped over your blog. Its amazing to know the facts, and its the same even with us in dockyard. I have been lucky to see a ship docking and undocking. Can you share some of details on keel blocks, it would be a great help to me. Regards, Ramamurthy, Visakhapatnam, India
    1
    Rajeev Jassal October 16, 2016
    Glad you found it useful Ramamurthy. I have one post on ship structures. Hope that could be of some help.
  • abhimanyu September 11, 2016
    very informative and great article for orals prep !
    1
    Rajeev Jassal September 15, 2016
    Glad you liked it Abhimanyu..
  • muangmon.j September 15, 2016
    that is good share for one
    1
    Rajeev Jassal September 15, 2016
    Thanks..
  • jaison September 19, 2016
    very informative article sir..helped a lot
    1
    Rajeev Jassal October 9, 2016
    Glad you liked it Jaison,,
  • Mohammed Alhassan October 2, 2016
    A very good and concise explanation especially for crew going to dock for the first time.
    1
    Rajeev Jassal October 9, 2016
    Thanks Mohammed..
  • Swapnil Ogale October 13, 2016
    Thank You very much sir for this wonderful article. Immensely helped me while answering my mates orals. Had never been to a drydock but could visualize perfectly.
    1
    Rajeev Jassal October 16, 2016
    Glad that it could be some help to you Swapnil..
  • Abhishek Kumar October 18, 2016
    Thanks a ton for the article sir.Can you tell me the name of the instrument which does vacuum test of bottom plug?
    1
    Rajeev Jassal October 28, 2016
    There is no special name for this. It is simply called "Leak Test Vacuum box".
  • Prashant kr. Rai October 20, 2016
    Sir can u pls tell me how come dock master will know that ship bottom had touched the blocks,What are the methods?
    1
    Rajeev Jassal October 28, 2016
    He knows the height of the blocks and when the draft of the ship is equal to this height, he would know that ship has touched the blocks. In case of floating dock, he will notice the additional weight on the online loadicator of the dock.
  • Satish October 28, 2016
    Sir, The way you explained is very simple and one can parallely imagine....just got the feeling that I was physically witnessing the whole scenario.....felt good reading....Thank u
    1
    Rajeev Jassal October 28, 2016
    Thanks Satish. Glad you found it interesting..
  • Soumen Guha Roy November 1, 2016
    Sir,this an awesome post as the others from you,very helpful for orals.Can you post something simple regarding stability,it would be quite helpful.Thanks.
    1
    Rajeev Jassal November 2, 2016
    Glad you liked it Soumen. I will write on stability soon..
  • mohsen salmanpour November 4, 2016
    Hi. excellent explanation. i have a question about dock master responsibility for any accident happened for the ship , dock crew and dry dock itself during docking & un-docking the vessels specially if during this procedure fatal accident causing human life to be lost. thanks a lot
    1
    Rajeev November 11, 2016
    It is not the dock master alone that would be responsible but the dry dock company. In case of fatal accidents, the ship owner might appoint a maritime lawyer and make monetary claims for the family of the seafarer.
  • Neeraj November 26, 2016
    Excellent blog sir, very informative, very practical , beautifully explained. I had few doubts about it, got cleared. Thanks a lot sir
    1
    Rajeev Jassal November 26, 2016
    Glad you liked it Neeraj..
  • jourlan eballar December 19, 2016
    Sir when to do the de-ballasting once the Ships is already inside
    1
    Rajeev Jassal December 29, 2016
    Dock master will advise when to start the deballasting. It is started when ship is aligned to the blocks. Dock master will advise to keep the minimum draft to keep the A/E running. When the shore supply is connected he will advise to keep on deballasting.
  • dani January 4, 2017
    Good day sir. Maybe i'm off the point a bit but what usually happens with staff members during a dry dock period of 2 to 3 weeks? For example on a cruse ship with hundreds of employees from all over the world.
    1
    Rajeev Jassal June 23, 2017
    The required staff stays onboard. I do not know about cruise ships but I guess the catering staff and all other staffs required for passengers are sent on leave and staff responsible for the operations of the ship remains on board.
  • Dhiren Chhaya February 11, 2017
    Excellent blog....Sir. Accidentally stumbled upon this blog and though not connected with Marine Engg. ; enjoyed reading.. Am basically a Mech. Engr.... enhanced knowledge.
    1
    Rajeev Jassal June 23, 2017
    Thanks, Dhiren...
  • Adriana Angulo June 21, 2017
    I'm glad to find this blog, I loved your complete explanation, it made it all clear for me . Thank you.
    1
    Rajeev Jassal June 23, 2017
    Glad you liked it, Adriana...
  • SHIVEN July 16, 2017
    m making presentation on dry dock u made my job a piece of cake with this data .
    1
    Rajeev Jassal July 29, 2017
    Glad you found it useful Shiven...
  • Moses July 27, 2017
    well explained and you made others realize that its not just sailing a ship into the sea.
    1
    Rajeev Jassal July 29, 2017
    Glad you liked it, Moses...
  • arvind kumar soorada September 29, 2017
    Thank you very much for such a detailed explanation.
    1
    Rajeev Jassal November 17, 2017
    Glad you liked it Arvind...
  • Abhishek Singh October 23, 2017
    Sir, It is possible to Dry dock a ship with trim by head??
    0
  • JohnA November 17, 2017
    Nice article. During dry docking what is the normal procedure for the electronics. Will the AIS, radar, etc be turned off? Thanks again!
    1
    Rajeev Jassal November 17, 2017
    There is no such requirement but if any yard specific requirement, then yard safety officer will let the vessel know in advance..
  • Rajeev Jassal November 17, 2017
    Thanks ...
    0
  • Tahir November 18, 2017
    Thank u a lot for information and we need more data about tugs maintenance and tug docking if u don't mind
    0
  • Supratip November 25, 2017
    Thnks for the vast imformation,So every time the new ship come,we can arrange the block according to that ship??
    0
  • Raushan Raj November 27, 2017
    Perfect explanation sir i will be glad if you also explain about bilge blocks and shores and how they are placed
    0
  • Tops Kumar December 17, 2017
    Excellent sir. This is the best article written in excellent and simple way. I just very happy.
    0
  • Satyajit Dilip December 26, 2017
    Excellent article, there is a repeated question asked in Master exams, How will you drydock a vessel with forepeak in damaged condition??
    0
  • Raj December 31, 2017
    Sir kindly advice why they need midship section plan and how it is useful in drydocking
    0
  • Deep January 9, 2018
    Why ship is trim by astern while dry docking and why it can't trim by forward
    0
  • DINESH February 14, 2018
    Thanks for the step by step procedures regarding chiefmate's responsibility for preparation dry dock. It has been a great help and got the idea on how it goes. A great preparations for my orals class 2 as well. Thank you so much Sir
    0
  • Bobby Saint March 9, 2018
    I appreciate you sharing a complete guide on how to bring a ship to dry dock. I've always wanted to learn how to do this because it has always been my dream to have my own boat or yacht. The tips or steps you've provided would surely help as a reference if I ever get to have my own boat in the future. Thanks. http://www.customdocksllc.com/
    0
  • SUNIL P GEORGE March 13, 2018
    Stern trim to be 0.9% of LBP as required by dock master My quiery is where is this info given?. MMD SURVEYOR question
    0
  • Jimmy Macwan March 24, 2018
    Hello, Good day Sir, My question is wrt stability prospects, where will be P when the vessel is sitting all over the blocks. This is a question frequently asked in MMD orals for Master candidates. Thank you in advance.
    0
  • Priyank Guhagarkar May 23, 2018
    Good day Sir, I have question regarding Crude Oil Washing for Crude OIl Tankers entering DD. Is there any specific requirement for Amount of Water used and No of minimum cycles to be carried out before entering DD.?
    0
  • Bipinjot singh July 24, 2018
    Very informative and detailed explanation sir. We can find the theory part on other parts but all the topics disccused bu you are added with practical knowledge and its implementation.
    0
  • Bipinjot singh July 24, 2018
    Very informative and detailed explanation sir. We can find the theory part on other sites but all the topics disccused bu you are added with practical knowledge and its implementation.
    0
  • Sohel Ahamed July 31, 2018
    Awesome sir. I can't explained you. Just one word- mind blowing. Sir i have one question to you. What is the name of Special keel block use in dry dock with loaded cargo??
    0
  • Frederick August 2, 2018
    Comment* Thanks for your effort, very useful informations. God blessed you Sir.
    0
  • Vijay singh August 13, 2018
    Sir , last month during my chiefmate oral surveyor asked , use of shores in drydock. I didn't know the answer, please sir can u answer this question, thanks in advance
    0
  • Prithvi Singh September 14, 2018
    Very well explained about Docking and Undocking of a vessel. But if possible, can you pass information regarding vacuum test of drain plugs before undocking.
    0
  • paresh devalia October 20, 2018
    PLEASE ADVICE ON BELOW QUESTION FOR WHICH IS FREQUENTLY ASKED IN ORAL FOR MATES & MASTER. MAINTENANCE ON ANCHOR & CHAIN LOCKER IN DRY DOCK?
    0
  • s k jha October 25, 2018
    beautifully explained,vodeo is real spice to the contents.
    0
  • aleixo mabiala November 2, 2018
    Thank You for a great information
    0
  • Chinthapalli Prasanth December 8, 2018
    very good explanation especially for crew going to dock for the first time.
    0
  • SHAIKH ARSHAAN January 13, 2019
    capt.rajeev, thank you for such beautiful explanation. can you please explain procedures for dry docking with forepeak tank ruptured.
    0
  • S.Thirumalar kannan February 8, 2019
    Excellent blog sir
    0
  • Win Kyaw Swar May 7, 2019
    Good day Sir, I have much knowledge and experience from your article. One of the condition is confusing me, that de-ballast operation during pumping out of dock water when the ship overall sits on all blocks. Why do we need to de-ballast after approved the ship's stability and condition by the dockmaster? Purpose? Is this operation optional requirement from the dockyard or essential to do? Appreciate your reply. with best regards, Win KS
    0
  • Sunil May 22, 2019
    What will happen to ECDIS or How does ECDIS afftected when the ship is already on the blocks at Dry Dock. This question was asked many time by MCA Surveyors in UK.Cany anyone share the answer to this ??
    3
    Ganesh Viswanath February 17, 2021
    Did you find the answer? if you found pls share.
    RAMIZ November 28, 2021
    THE SPEED LOG SENSOR IS IN-OPERATIVE WHEN THE VESEEL IN ON THE BLOCK. REST THE ECDIS WORKS FINE!!!! YOU CAN DO THE PASSAGE PLANNING AS YOU CARRY OUT AS NORMAL IN SEA GOING CONDITION.
  • M.s.sundaram June 3, 2019
    Excellent work vauable information thank you captain
    0
  • RAM July 24, 2019
    Sir kindly add the clearance check near shaft I once witnessed this but have no clue about do & don’t.Kind of blade type material used to demonstrate. I haven’t raised question to my C/Eng so kindly explain
    0
  • Vincenzo Viator August 22, 2019
    I enjoy what you guys are usually up too. This sort of clever work and coverage! Keep up the wonderful works guys I’ve added you guys to my blogroll.
    0
  • Terrence Towell August 22, 2019
    I’d love to be a part of group where I can get advice from other experienced people that share the same interest. If you have any recommendations, please let me know. Thank you.
    0
  • Surjeet October 19, 2019
    Your article provide such a great information with good knowledge. Sir please if u could explain what all checks to be carried out after vessel is out of drydock and at sea... Thank you very much for sharing such knowledge.
    0
  • CHRISTOPER November 20, 2019
    This helped me understand some good ways to get started. Thank you.
    0
  • Suhag mistri April 9, 2020
    Dear Rajiv, we are looking for documenting process for dry docking and PMS for Barges. Please contact me on suhag@mastermindindia.in or +918460358894 if you can help
    0
  • AMAR ANAND April 22, 2020
    Great article sir... as usual ....very informative ..
    0
  • S.banavali July 4, 2020
    Good day sir I have a question regarding the critical period during undocking does the vessel experience this during undocking also as I have not found any literature on it anywhere
    0
  • KARAN SHARMA July 14, 2020
    It was a very useful blog sir Can u please also explain why we keep trim by head when we make departure from drydock?
    0
  • Luis July 15, 2020
    A great tool for cleaning ship areas which you can't reach is the telescoping wand from https://bestcargurus.com/. You might want to check it out.
    0
  • Rajesh Mayaperumal August 7, 2020
    Dear sir. Your article is very useful for me.i have some doubts regard drydock. Please clarify my doubts. 1) why ship enters in dock with trim by stern. 2). How to paint the area between keel blocks and keel.
    0
  • Cyrus Blake Crewford September 8, 2020
    The main objective in carrying out dry docking is to ensure ships are operational and to maintain their class license. Structural machinery and various components are subjected to inspection and maintenance to ensure sea worthiness. Dry docking is also required if a ship has sustained damage to the under water structure due to grounding, collision or any other damage which will affect the water integrity of the ship’s hull.
    0
  • Panagiotis October 25, 2020
    Captain you love what you are doing and this is obvious...thank you for sharing your knowledge.
    0
  • P.Mariappasamy January 9, 2021
    Even though I had 2 DD experience, i see a new things in your article sir. Loved it very much. As an engineer, Hardly have a chance to see all these maintenance outside hull.
    0
  • Paul January 13, 2021
    When ever you are at the dry Dock. You add some knowledge to your job. Great experience though.
    0
  • Design Dock January 19, 2021
    Thank you for posting your blog, in your blog, there is a lot of useful information about Dock. Keep sharing such a nice knowledge with all of us. https://designdockcompany.com/
    0
  • Himanshu Soni January 20, 2021
    hie sir you pls share, how to DD a ship in emergency if a ship is loaded , what precautions to take ?
    0
  • Ahad Jibon February 27, 2021
    Thank you for this unknown to me yet interesting & easy explanation sir. I didn't get any chance of docking yet but these words made me feel like I was there already.
    0
  • Yash jaiswal April 7, 2021
    Before going for Drydock what things will be prepared in relation to LSA and FFA... Question was asked during the Orals
    0
  • GAMMA Marine April 9, 2021
    Thank you for providing such great information. Please find the details below for chief mate oral prep
    0
  • Jim Federer June 3, 2021
    The content of the post is really helpful. Do you have any procedure for keel block removal under load? Thanks
    0
  • Jim Federer June 3, 2021
    The content of the post is really helpful. Do you have any procedure for keel block removal under load? Thanks
    0
  • Tasif June 30, 2021
    Great post. I was once checking constantly this weblog and I'm impressed! Extremely useful information specially the closing part. I maintain such information much. I was once seeking this specific information for a very long time. Many thanks and best of luck.Infographic Submission
    0
  • clamotine August 14, 2021
    very informative and your explanation is wonderful
    0
  • clamotine August 14, 2021
    lovely information as we have been looking for.
    0
  • Mark Louie Mantua September 22, 2021
    Hello sir..do we need to shut down gyro as well when vessel is docking?
    0
  • Economy Dock Seawall April 7, 2022
    Thank you for this informative piece of writing. I like the way you have explained even the minor details, which will let anyone to understand the whole procedure very well. Keep sharing such good work. Regards, Economy Dock Seawall And Dredge Company
    0
  • Ayinde T A May 9, 2022
    It is a good write up this as added to my experience being in dock with vessels. Please sir, explain the precautions to be take to ensure successful docking of a vessel.
    0
  • Anir Aubath Beharilal July 2, 2022
    Thanks Captain, I am preparing for my chief mates orals. This is the best explanation I have ever came across, Normally don't leaves comments haha, But just wanted to say a big thank you. I have been to dry dock only once on my first ship as a cadet and can now relate to much more after reading this. Anir from South Africa
    0
  • Gourav September 1, 2022
    Excellent explanation sir, could you please elaborate a little about dry and wet sounding of tank and why do we take them ?
    0
  • Joswin Aranha September 1, 2022
    I felt like I was actually in the drydock while reading the post. Great explanation Sir.
    0
  • Prabodh KUmar Kharwar May 6, 2023
    Excellent blog sir, very informative, very practical , beautifully explained. one Doubt why not vessel enter dock in Even Keel condition instead of 0.5 trim by stern.
    0
  • Davies samuel adrwale July 3, 2023
    Am looking for someone to take me to dry docking with all these tips have read to see for my self practically because I really enjoy reading it
    0
  • Gurpreet Singh May 29, 2024
    Sir when ship is fully sitted on blocks where is the posn of G
    0
Capt Rajeev Jassal

About Capt Rajeev Jassal

Capt. Rajeev Jassal has sailed for over 24 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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