Ad Hoc Panel #8 - Safety of Passenger Ships: Flooding Survivability

1. Ad Hoc Panel #8 -Safety of Passenger Ships: Flooding Survivability RADM Gordon Piché, USCG (Ret.) • Chair, Ad Hoc Panel #8 William Peters. • Naval Architecture Division,U.S. Coast Guard (G-MSE-2). SMTC, Washington DC

2. Safety of Passenger Ships: Flooding Survivability • Background • IMO Large Passenger Ship Safety • LPS at SLF 47 (Sept. 2004) • Framework for LPS Investigations • Time-to-Flood Study SMTC, Washington DC

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 • Mar 2004 – Panel re-established • Activity: Letter to RINA before MSC 78 • MSC 78 agreed on upward trend SMTC, Washington DC

4. LPS at SLF 47 (September 2004) • Completed: Subdivision and damage stability criteria (presented under “IMO Harmonization”) • Work in Progress: • measures to limit progressive flooding • characterization of designed survivability • structural integrity after damage SMTC, Washington DC

5. Framework of LPS Investigations(post SLF 46 – 2003-2004) • Practical Assessment (Finland) • Refine Time-to-Flood study (US) • Model Tests (Italy & Japan) • Independent projects to share information SMTC, Washington DC

6. Large Passenger Ship Safety: 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 SMTC, Washington DC

7. Large Passenger Ship Safety: 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: SMTC, Washington DC

8. Large Passenger Ship Safety: Time-to-Flood Project • U.S. sponsors additional time-to-flood analysis using FREDYN computer program at MARIN • FREDYN used to determine survival time after damage • Not built sample ship used for analysis • Time-based process accounts for intermediate stages of flooding • Internal “semi-watertight” spaces modeled to determine their effect using Practical Assessment recommendations SMTC, Washington DC

9. MARIN Time-to-Flood (TTF): Assumed Damage Extents SMTC, Washington DC

10. TTF Results: 2 Comp’t, BHD Deck Breached, Splashtight Doors Closed SMTC, Washington DC

11. TTF Results: 3 Comp’t, BHD Deck Breached, Splashtight Doors Closed SMTC, Washington DC

12. TTF Results: 3 Comp’t in Waves SMTC, Washington DC

13. TTF Results: 3 Comp’t with Different Downflooding Assumptions SMTC, Washington DC

14. 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 SMTC, Washington DC

15. LPS at SLF 47 (September 2004) • 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 SMTC, Washington DC

16. Safety of Passenger Ships: 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/home.html • www.sname.org/committees/tech_ops/O44/passenger/activity.html SMTC, Washington DC