Questions about Design loads in DNV Standard for Certification of Craft 2.21

Discussion in 'Class Societies' started by Aryo Baskoro, Nov 29, 2017.

  1. Aryo Baskoro
    Joined: Nov 2017
    Posts: 1
    Likes: 0, Points: 1
    Location: Indonesia

    Aryo Baskoro New Member

    Hello, my name is Aryo

    I would like to ask you some questions about calculating the sea pressure based on DNV Standard for Certification of Craft. To calculate sea pressure there is longitudinal distribution of sea pressure (klb) there is x Lh to be known (Ch. 4 Sec. 2) . Does anybody know what x and Lh definitions?
    upload_2017-11-29_18-45-15.png
    Thank you
     
    Last edited: Nov 29, 2017
  2. daiquiri
    Joined: May 2004
    Posts: 5,371
    Likes: 258, Points: 93, Legacy Rep: 3380
    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Are you sure that you are using the updated version of DNV-GL rules?
     
  3. RAraujo
    Joined: Apr 2010
    Posts: 145
    Likes: 37, Points: 28, Legacy Rep: 114
    Location: Singapore

    RAraujo Senior Member - Naval Architect

    Hi Aryo,
    Without having checked the standard I would say that Lh is the hull length (as defined in the standard) and x Lh (I think it shall be x/Lh) is the non-dimensional longitudinal location (0 for the extreme aft and 1 for the extreme forward ends of Lh)
     
  4. Ad Hoc
    Joined: Oct 2008
    Posts: 7,771
    Likes: 1,673, Points: 113, Legacy Rep: 2488
    Location: Japan

    Ad Hoc Naval Architect

    Welcome Aryo.
    If you don't know the answer to this, then perhaps you should let someone else do your design for you. It should be self explanatory.

    x = part - length of hull
    Lh = hull length.

    So for example, if your hull is 30m in length, and you wish to check the value of K at a speed-length ratio of 4, at amidships, then the value is simply 15/30 = 0.5. Thus 0.5 gives you a value of K of roughly 0.75
     

  5. Alik
    Joined: Jul 2003
    Posts: 3,074
    Likes: 357, Points: 93, Legacy Rep: 1306
    Location: Thailand

    Alik Senior Member

    1. This standard has been replaced in 2016 by DNV-GL ST 0342.
    2. For design loads, both 0342 and 2.21 use older version of ISO12215-5.
     
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.