Fabrication standard for penetration

Discussion in 'Metal Boat Building' started by adam_designer, May 5, 2015.

  1. adam_designer
    Joined: Jul 2010
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    Location: Banyuwangi, Indonesia

    adam_designer Junior Member

    Dear Members

    after years working and designing composites boats. recently I am working for aluminium boat yard , have been digging and eating rules of several class BV and DNV but so far i cant find standard scantling of penetration for hull, bulkheads and decks. only normative quotes like " shall be strengthened" or something like " having adequate support". What i looking for is some detailed drawing and scantling like this:

    [​IMG]

    is there any source for this matter, i tried to find on IACS but there is too many files to explore and hopefully someone could bring some light. Thank you.
     
  2. adam_designer
    Joined: Jul 2010
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    Location: Banyuwangi, Indonesia

    adam_designer Junior Member

  3. WindRaf
    Joined: Oct 2014
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    Location: Italy

    WindRaf Senior Member

    normally those who built and sold the plates must know the data Brinell of their material
     
  4. Ad Hoc
    Joined: Oct 2008
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    Ad Hoc Naval Architect

    Basically the penetration of the shell plate must have a localised increase of 1.5 times the surrounding plate thickness. In addition the foundations/seating must be stiff in a minimum of 2 axis to prevent movement and vibration issues.

    That's it.
     
  5. Oleboynow

    Oleboynow Previous Member

    What exactly do you mean by penetration?
    Term normally applies weld penetration
     
  6. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    Tubes, for example, penetrating the hull (see figure in post # 1)
     
  7. adam_designer
    Joined: Jul 2010
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    Location: Banyuwangi, Indonesia

    adam_designer Junior Member

    gents, Thank you so much for reply. Ad Hoc, thanks for valuable rule of thumb figures. hope this post will be usable for others.
     
  8. Oleboynow

    Oleboynow Previous Member

    OKEY DOKEY
     
  9. Oleboynow

    Oleboynow Previous Member

    normally on alluminium boat I turn a ring, seal weld outside to shell and light bead all around inside
    then screw a ss valve on, throwing away the flange of the 3 piece valve so the teflon seal sits on the ring, making the seal
    then I isolate screws with shrink tube and poly something or other washers keeping the inboard flange
    thickness of ring, is usually 2 to 2.5 dia of screw, so 10mm hex head need 25 plate for Lloyds if I remember correctly
    in reality 20 pl is ok
    sorry abt vague comment re penetrations, was half asleep and last build was 16 yrs back
    sorry too abt the very rough scetchup
     

    Attached Files:

  10. adam_designer
    Joined: Jul 2010
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    Location: Banyuwangi, Indonesia

    adam_designer Junior Member

    Thanks Oleboi... very inforamative input.
     

  11. Oleboynow

    Oleboynow Previous Member

    prob worth noting, that you cannot use the thread of the bolts that hold these 3 piece valves to tap the pad flange, cos they are not a recognised thread, but some random thread used by the valve maker
    I prefer UNC
    But the valves are trouble free and so far 30 years service on some of my builds
     
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