RIB buoyancy calculation according ISO-6185/3

Discussion in 'Class Societies' started by GREEKFLEET, Jan 17, 2008.

  1. GREEKFLEET
    Joined: May 2007
    Posts: 13
    Likes: 1, Points: 3, Legacy Rep: 12
    Location: ATHENS

    GREEKFLEET Junior Member

    hello designers and "wanbe" designers!
    I would like to ask a question in those who have used this standard.

    The "buoyancy of the rib" witch is involved in some basic equations according to the standard is (paragraph 3-3.4) :the inflated buoyancy and the permanent inherent buoyancy or at least two compartements of permanent sealed buoyancy ,fixed to the rigid hull, not exceeding 20% of the total buoyancy.

    can you please explain that to me.

    for example:
    if we say a=inflated volume
    b=the perm.inherent buoyancy or
    the perm.sealed buoyancy
    then a+b=T(total volume)
    but b<=0.2T
    so a+0.2T=T
    a=T*0.8
    T=a/0.8 which means the volume is 10/8 *a=1.25a

    Am i wright?

    thank you very much and sorry for stealing you time!
     
  2. Dutch Peter
    Joined: Aug 2004
    Posts: 645
    Likes: 7, Points: 28, Legacy Rep: 66
    Location: The Netherlands

    Dutch Peter Senior Member

    I think you should read it this way:

    buoyancy of a rib is: inflated + inherent OR perm. sealed + inherent

    and the condition on the permanently sealed buoyancy is that is should not be more then 20% of the total
     
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.