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2004 harm present

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Published on November 5, 2007

Author: Mee12

Source: authorstream.com

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Harmonization of Subdivision & Damage Stability Regulations in SOLAS Chapter II-1:  Harmonization of Subdivision & Damage Stability Regulations in SOLAS Chapter II-1 James Person U.S. Coast Guard (G-MSE-2) Robert Tagg Herbert Software Solutions, Inc. Harmonization of Subdivision & Damage Stability Regulations :  Harmonization of Subdivision & Damage Stability Regulations Historical Background SLF 46 SDS Correspondence Group MSC 78 Decisions SLF 47 Outcome The Way Ahead Historical Background:  Historical Background 1973 – A.265 Passenger Ship 1992 – SOLAS B-1 Cargo Ship 1993 – SLF begins Damage Stability Harmonization effort 2000-2003 – EU HARDER Project 2003 – SLF 46 2004 – SLF 47 SLF 46:  SLF 46 Considered HARDER Project results & proposals Majority accepted subject to some further validation Single “R” for all dry cargo ship types Downward trend of survivability for larger passenger ships was unacceptable; the trend should be upwards for larger ships and for ships with greater numbers of passengers Requested guidance from MSC on the “equivalent level of safety” conflict Established the SDS Correspondence Group Survivability of Passenger Ships – Downward Trend:  Survivability of Passenger Ships – Downward Trend SDS Correspondence Group – Terms of Reference:  SDS Correspondence Group – Terms of Reference Coordinate validation of sample ship calculations regarding: p-factor; SEM method & possible introduction of an Hmin factor; transient & intermediate stages of flooding/equalization; minimum values of the index A at specific draughts; required index R; passenger heel and wind moments; and investigate the impact of the proposal on the design of ships, in particular large passenger ships Finalize the draft revised SOLAS Chapter II-1 SDS Correspondence Group – Actions:  SDS Correspondence Group – Actions Initial task – validate and finalize the calculation methodology various studies, analyses, proposals, etc. an intersessional meeting in Malmö, Sweden Questionnaire voting Summary of results in SLF 47/3/2 SDS Correspondence Group – Actions:  SDS Correspondence Group – Actions Re-calculation of sample ships using agreed formulas from Questionnaire results Major formula changes for passenger ships – necessary to recalculate all passenger ships Minor formula change for cargo ships – not necessary to recalculate all cargo ships 52 sample ship calculations conducted 32 passenger ships and 20 cargo ships Analyses for “R” conducted by NTUA Summary of results in SLF 47/3/3 SDS Correspondence Group – Actions:  SDS Correspondence Group – Actions Revised SOLAS Chapter II-1 Parts A, B and B-1 reviewed and updated draft text submitted version in SLF 47/3/1 Proposals for “R” and minimum values of “A” no exact consensus for “R”, but general support for “R” proposals no exact consensus on minimum values of “A” but general support for min “A” proposals summary of results in SLF 47/3/8 MSC 78 Decisions – Confirmed SLF 46 opinions:  MSC 78 Decisions – Confirmed SLF 46 opinions Same survivability standard “R” for all dry cargo ship types even if ro-ros must meet a higher standard Survivability standard “R” for passenger ships should increase with ship size and number of persons onboard even if this means exceeding current SOLAS Complete harmonization task – finalize revised SOLAS Chapter II-1 for approval at MSC 79 SLF 47 Outcome – Initial decisions in plenary:  SLF 47 Outcome – Initial decisions in plenary majority opinion that the proposed harmonized subdivision and damage stability regulations were a technically sound standard and that they should be finalized at SLF 47 Italy strongly opposed – they want to delay to allow further validation work (specifically the “p” and “s” factors for large passenger ships) agreed to delete inclusion of SEM method in “s” factor because effects of water on deck already adequately accounted for SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions Reg 7-1 “p” factor Due to alternate proposal by Italy, damage distributions and statistical analyses for “p” factor were reviewed General majority view that “p” factor in draft reg 7-1 was as accurate and correct as could be expected from the available collision damage statistics SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions Reg 7-2 “s” factor based on residual GZ, range, and heel angle intermediate stage flooding criteria only for passenger ships (similar to current SOLAS) additional heeling moments applied only to passenger ships (similar to current SOLAS) SEM method dropped SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions Reg 6 Required Subdivision Index “R” Passenger ships considered sample ship calculation results and methodology used to develop “R” considered alternate proposal by ICCL (with standard deviation) agreed to Correspondence Group proposal for “R” Added new minimum partial “A” requirement (0.9R) at each partial draft SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions Reg 6 Required Subdivision Index “R” Cargo ships considered sample ship calculation results agreed to Correspondence Group proposal for “R”, except for small ships less than 100m for ships less than 100m, knuckle point and lower “R” line similar to current Part B-1 Added new minimum partial “A” requirement (0.5R) at each partial draft SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions SLF 47 Outcome – SDS Working Group actions :  SLF 47 Outcome – SDS Working Group actions Reg 9 Double Bottoms Harmonized for passenger & cargo ships DB height = B/20 (min 0.76m & max 2.0m) If full DB not fitted, then must comply with bottom damage survivability standard Current passenger ship DB length applicability limits deleted SLF 47 Outcome – Final action:  SLF 47 Outcome – Final action SLF agreed to the draft revised SOLAS Chapter II-1 Parts A, B and B-1 for submission to MSC 79 for approval with a view to adoption Italy reserved its position (with several others) & intends to submit a proposal to modify the Chapter II-1 draft text directly to MSC 79 for consideration The Way Ahead:  The Way Ahead MSC 79 – December 2004 considered for approval IMO procedural issue: 6 month interval required between approval and adoption MSC 80 – May 2005 considered for adoption Into force date?

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