Gap Between Containers In Length Direction

Discussion in 'Class Societies' started by naserrishehri, Jun 29, 2015.

  1. naserrishehri
    Joined: Jun 2006
    Posts: 163
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: iran bushehr

    naserrishehri Senior Member

    DEAR FRIENDS
    i do not have enough space in the cargo hold to keep 76mm gap between the containers.
    can i consider 3mm gap between them?
    is it against any rule?
    please see the attachment for more clarifications.
     

    Attached Files:

  2. TANSL
    Joined: Sep 2011
    Posts: 6,163
    Likes: 287, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

    3 mm in ships is nothing. Consider, for example, variations in length due to temperature, with objects having very different coefficients of expansion. 40ºC for containers of upper rows and 28°C in lower rows, what will happen?
     
  3. rwatson
    Joined: Aug 2007
    Posts: 5,852
    Likes: 290, Points: 83, Legacy Rep: 1749
    Location: Tasmania,Australia

    rwatson Senior Member

    Attached Files:

  4. Ad Hoc
    Joined: Oct 2008
    Posts: 6,577
    Likes: 598, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    See ISO 3874.
     
  5. TANSL
    Joined: Sep 2011
    Posts: 6,163
    Likes: 287, Points: 93, Legacy Rep: 300
    Location: Spain

    TANSL Senior Member

  6. rxcomposite
    Joined: Jan 2005
    Posts: 2,098
    Likes: 226, Points: 63, Legacy Rep: 1110
    Location: Philippines

    rxcomposite Senior Member

    They do. Part of their routine job. They move around in spaces where the stays are attached and tap on the cables/rods like a tuning fork to test if it is tight or loose and adjust accordingly. I saw it in one of the videos in YouTube.
     
  7. naserrishehri
    Joined: Jun 2006
    Posts: 163
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: iran bushehr

    naserrishehri Senior Member

    it is not necessary to survey all of the twist locks during the voyage.
    the mentioned vessel carry 18 containers in it's hold and rod lashing will not be used.just twist locks will be used.
     
  8. rwatson
    Joined: Aug 2007
    Posts: 5,852
    Likes: 290, Points: 83, Legacy Rep: 1749
    Location: Tasmania,Australia

    rwatson Senior Member

    So, how will the guys undo the twist locks before the crane swings them out ? The aren't going to fit into a few millimeters.

    PS - more importantly - how are they going to fasten them during loading ?
     
    Last edited: Jul 1, 2015
  9. naserrishehri
    Joined: Jun 2006
    Posts: 163
    Likes: 0, Points: 16, Legacy Rep: 10
    Location: iran bushehr

    naserrishehri Senior Member

    min. gap as per rule can be 76mm or 51mm.i do not know how the guys undo the twist locks.
     

    Attached Files:

  10. rwatson
    Joined: Aug 2007
    Posts: 5,852
    Likes: 290, Points: 83, Legacy Rep: 1749
    Location: Tasmania,Australia

    rwatson Senior Member

    I guess they can get to them from the sides, but 103 mm wont be enough
     
  11. murdomack
    Joined: Jun 2007
    Posts: 309
    Likes: 23, Points: 18, Legacy Rep: 282
    Location: Glasgow

    murdomack New Member

    The 76mm spacing comes from 3". The original container o/a lengths were 40ft, then a 20ft half length was 19' 10-1/2" o/a. There were 3" blocks that could join two 20ft's for lifting as one 40ft. I think you can still get them.
    You need to maintain the 76mm so that you can carry 20's and 40's on the same twist-lock deck foundations, if the need arises. If you are certain that you will only carry 20's then you could reduce the gap to where you can still access and operate your twist-locks.. There is not going to be much gained.

    Regarding the width, I am not certain if there is a set gap stipulated, but I know that the Seacell container that was developed to carry two or three Euro pallets, i.e. 2,400mm clear width inside, relied on this gap to get the side wall corrugations to "knit" together. I'm sure the gap was only 25mm, or 1" probably. The corrugations on the Seacell travel 29/32" into this space.
    The twist-locks can normally be unlocked from the top or from the side of the container using long poles like boat hooks.
    http://www.seacoglobal.com/equipment/specialised-containers/40ft-highcube-seacell/
     

  12. murdomack
    Joined: Jun 2007
    Posts: 309
    Likes: 23, Points: 18, Legacy Rep: 282
    Location: Glasgow

    murdomack New Member

    To allow 5 TEU in line the hatch/hold will need to be >100ft 4-1/2".
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.