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Passenger Ship Flooding Survivability

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Passenger Ship Flooding Survivability William S. Peters, Life Member, Naval Architecture Division, U.S. Coast Guard Riaan van t Veer, Visitor, MARIN – PowerPoint PPT presentation

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Title: Passenger Ship Flooding Survivability


1
Passenger Ship Flooding Survivability
  • William S. Peters, Life Member, Naval
    Architecture Division, U.S. Coast Guard
  • Riaan vant Veer, Visitor, MARIN
  • Andrea Serra, Member, Fincantieri
  • Anna-Lea Rimpela, Visitor, Kvaerner-Masa Yards
  • Yoshiho Ikeda, Visitor, Osaka University

2
Passenger Ship Flooding Survivability
  • Background Old and Recent
  • IMO Large Passenger Ship Safety
  • LPS at SLF 47 (Sept. 2004)
  • Framework for LPS Investigations
  • Practical Assessment
  • Model Tests
  • Time-to-Flood Study
  • LPS Tasks

3
Recent Background
  • 1999 Ad Hoc 8 established
  • 2000 IMO LPS Initiative
  • Does SOLAS handle LPS the right way?
  • 2001 2003 SLF involved HARDER
  • LPS conclusion downward trend
  • May 2004 MSC 78 agreed on upward trend
  • Establish Casualty Thresholds
  • Sep 2004 SLF 47 LPS

4
IMO Large Passenger Ship Safety
  • How well does current SOLAS handle safety needs
    of passenger ships carrying gt 2,500 persons?
  • 80 passenger ships with this capacity today
    More Planned (15)
  • Reasons for concern
  • 4.3 million North American passengers embarked in
    1st half of 2004

5
LPS at SLF 47 (September 2004)
  • Completed Subdivision and damage stability
    criteria (presented under Harmonization)
  • Work in Progress
  • measures to limit progressive flooding
  • usefulness of time-to-flood studies
  • characterization of designed survivability
    floatability assessment
  • structural integrity after damage
  • threshold criteria -

6
Framework of LPS Investigations (post SLF 46
2003-2004)
  • Practical Assessment (Finland)
  • Model Tests (Italy Japan)
  • Refine Time-to-Flood study (US)
  • Independent projects to share information

7
Practical Assessment
  • Weather-tight doors which start to leak, but with
    a high collapse pressure
  • Fire door with no leakage threshold but with
    moderate to high collapse pressure
  • Joiner door with no leakage threshold and with
    low to moderate collapse pressure.
  • Provided suggested parameters to MARIN study

8
Model Test Projects Italy Japan
  • Common unbuilt design used for model tests.
  • Similar sized model scale 1/40 1/50
  • Two compartment cases investigated.
  • Model included only steel boundaries.

9
Italy Model Test Results
  • Agreement with static calculations

10
Japan Model Test Results
  • High sensitivity to intermediate conditions
    flooding on multiple decks

11
Time-to-Flood Project
  • 2003 - Initial study completed and submitted to
    SLF 46 (Sept. 2003)
  • Sponsored by US performed at MARIN
  • 2004 Follow-on study incorporated refinements
    suggested at SLF 46 and results from Practical
    Assessment

12
MARIN Time-to-Flood (TTF) Assumed Damage Extents
13
TTF Results 2 Compt, BHD Deck Breached,
Splashtight Doors Closed
14
TTF Results 3 Compt, BHD Deck Breached,
Splashtight Doors Closed
15
3 Compartment Damage, Righting Arm s-factor
results
  • GM 1.6m
  • ?e 15,915 deg
  • Range 0 deg
  • GZmax 0.0 m
  • K 0
  • Sfinal 0.0

16
3 Compartment Damage, Righting Arm s-factor
results
  • GM 2.1m
  • ?e 2,658 deg
  • Range 13.031 deg
  • GZmax 0.134 m
  • Sfinal 0.95

17
TTF Results 3 Compt in Waves
18
TTF Results 3 Compt with Different Downflooding
Assumptions
19
TTF Results 3 Compt with Different Downflooding
Assumptions
20
Time-to-Flood Conclusions from Final Study
  • Refined modeling provides improved simulation
    results
  • reduced heel in intermediate stages
  • Results are sensitive to modeling of downflooding
    points
  • Protection by doors
  • How doors leak and collapse critical
  • Initial GM important to survivability

21
LPS Tasks Underway
  • SDS Correspondence Group work
  • consideration of the usefulness of time-domain
    flooding studies
  • investigation of raking damage issues
  • determine if a floatability assessment criteria
    can be established (when s-factor 0)
  • develop threshold criteria for survivability to
    satisfy either of two scenarios
  • 1) return to port or
  • 2) remain habitable for at least 3 hours for
    evacuation

22
Passenger Ship Flooding Survivability
  • Thank you for attending.
  • Please visit the Ad Hoc Panel 8 website to
    follow ongoing activity
  • www.sname.org/committees/tech_ops/O44/passenger/ho
    me.html
  • www.sname.org/committees/tech_ops/O44/passenger/ac
    tivity.html
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