Normatives for construction of a bottom glass boat

Discussion in 'Boat Design' started by sn1987, Jul 11, 2016.

  1. sn1987
    Joined: Mar 2016
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    Location: italy

    sn1987 Junior Member

    Hello to everybody,
    I have to design a new glass bottom boat. This boat has to navigate within 1 mile of the coast, has to transport up to 30 passengers and has got a lenght of about 15m. I was wondering what kinds of normatives I have to use. I suppose directive 2009/45/CE for the navigation in the european union (class D boat). Is it correct?
    Is it possible to use the directive 2013/53/ue?
    Thanks to all.
     
  2. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    Typically, the administration of your country has a clearly specify which standards or rules must apply to this type of ship. Keep in mind that it is a work boat, not recreation, less than 24 meters in length and therefore there are no rules clearly to him. In my opinion, it is essential to consult with the marítma Administration.
    As for the standard to be met by crystals underwater windows, the same applies, administrations usually suggest rules and procedures that must be followed. In any case, the crystals must be calculated by direct calculation.
     
  3. sn1987
    Joined: Mar 2016
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    Location: italy

    sn1987 Junior Member

    Tank you TANSL.
    The structure is to be built in mahogany plywood with epoxy. Do you have any suggestion about how watertight the structure in proximity of the crystals has to be realised? I think to reinforce the opening with some steel bars on the water side and fix here the glass with crossing bolts.
    is it correct to use tempered glass?
     
  4. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    I enclose the calculations for a catamaran and solution for fixing the frame and the glass. It's all in Spanish but I think you can understand it.
    Project pressures for calculating glasses corresponds to the Spanish legislation.
    The hull was GFRP, I hope you can adapt for your boat.
     

    Attached Files:

  5. sn1987
    Joined: Mar 2016
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    Location: italy

    sn1987 Junior Member

    It's perfect. Thanks a lot for your precious advice. I will read with attention. One last question. Did you study the possible problems to the glass due to the vibration of main engine?
     

  6. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    No, I did not study it as, in my opinon, is not necessary. Engines vibration affects glasses a much lesser extent than the hull bottom near engines, also not studied from this standpoint. Glasses, themselves, are more resistant than the hull and what the aim is to avoid breakage due to maximum pressure or an impact of an submerged object. Therefore it is advisable to put some external, additional protection. Furthermore, as a hole in the hull is made, it must be conveniently reinforce the opening. That is the reason for placing additional intermediate frames and longitudinals. The thickness of the shell must be double in the frame area and the frame, which must be metal, screwed with through bolt.
     
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