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December 1, 2004Chesapeake Section SNAME1 Passenger Ship Flooding Survivability William S. Peters, Life Member, Naval Architecture Division, U.S. Coast.

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Presentation on theme: "December 1, 2004Chesapeake Section SNAME1 Passenger Ship Flooding Survivability William S. Peters, Life Member, Naval Architecture Division, U.S. Coast."— Presentation transcript:

1 December 1, 2004Chesapeake Section SNAME1 Passenger Ship Flooding Survivability William S. Peters, Life Member, Naval Architecture Division, U.S. Coast Guard Riaan van’t Veer, Visitor, MARIN Andrea Serra, Member, Fincantieri Anna-Lea Rimpela, Visitor, Kvaerner-Masa Yards Yoshiho Ikeda, Visitor, Osaka University

2 December 1, 2004Chesapeake Section SNAME2 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 December 1, 2004Chesapeake Section SNAME3 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 December 1, 2004Chesapeake Section SNAME4 IMO Large Passenger Ship Safety How well does current SOLAS handle safety needs of passenger ships carrying > 2,500 persons? 80+ passenger ships with this capacity today – More Planned (15) Reasons for concern – –4.3 million North American passengers embarked in 1 st half of 2004

5 December 1, 2004Chesapeake Section SNAME5 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 December 1, 2004Chesapeake Section SNAME6 Framework of LPS Investigations (post SLF 46 – ) Practical Assessment (Finland) Model Tests (Italy & Japan) Refine Time-to-Flood study (US) Independent projects to share information

7 December 1, 2004Chesapeake Section SNAME7 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 December 1, 2004Chesapeake Section SNAME8 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 December 1, 2004Chesapeake Section SNAME9 Italy Model Test Results Agreement with static calculations

10 December 1, 2004Chesapeake Section SNAME10 Japan Model Test Results High sensitivity to intermediate conditions – flooding on multiple decks

11 December 1, 2004Chesapeake Section SNAME11 Time-to-Flood Project 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 December 1, 2004Chesapeake Section SNAME12 MARIN Time-to-Flood (TTF): Assumed Damage Extents

13 December 1, 2004Chesapeake Section SNAME13 TTF Results: 2 Comp’t, BHD Deck Breached, Splashtight Doors Closed

14 December 1, 2004Chesapeake Section SNAME14 TTF Results: 3 Comp’t, BHD Deck Breached, Splashtight Doors Closed

15 December 1, 2004Chesapeake Section SNAME15 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 December 1, 2004Chesapeake Section SNAME16 3 Compartment Damage, Righting Arm & s-factor results GM = 2.1m  e= 2,658 deg Range = deg GZmax = m Sfinal= 0.95

17 December 1, 2004Chesapeake Section SNAME17 TTF Results: 3 Comp’t in Waves

18 December 1, 2004Chesapeake Section SNAME18 TTF Results: 3 Comp’t with Different Downflooding Assumptions

19 December 1, 2004Chesapeake Section SNAME19 TTF Results: 3 Comp’t with Different Downflooding Assumptions

20 December 1, 2004Chesapeake Section SNAME20 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 December 1, 2004Chesapeake Section SNAME21 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 December 1, 2004Chesapeake Section SNAME22 Passenger Ship Flooding Survivability Thank you for attending. Please visit the Ad Hoc Panel #8 website to follow ongoing activity: passenger/home.htmlwww.sname.org/committees/tech_ops/O44/ passenger/home.html passenger/activity.htmlwww.sname.org/committees/tech_ops/O44/ passenger/activity.html


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