ABS-5-NOTICE-4-2007.pdf

ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH . 2006 1 RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH 2006 NOTICE NO. 4 July 2007 The following Rule Changes were approved by the ABS Rules Committee on 7 June 2007 and become EFFECTIVE AS OF 1 JULY 2007*. (See http:/www.eagle.org/rules/downloads.html for the consolidated version of the Rules for Building and Classing Steel Vessels Under 90 meters (295 feet) in Length 2006, with all Notices and Corrigenda incorporated.) Notes * Except the change to 3-6-1/1.1.1, which is effective as of 1 July 2006 (based on the “keel laying” date or similar stage of construction) in line with the 2003 Amendments to SOLAS 1974, Chapter V, Reg. 2.4 Resolution MSC 142(77). - The date in the parentheses means the date that the Rule becomes effective for new construction based on the contract date for construction, unless otherwise noted. (See 1-1-4/3.3.) - The date in the parentheses with underline means that the Rule becomes effective based on the “keel laying” date or similar stage of construction. PART 3 HULL CONSTRUCTION AND EQUIPMENT CHAPTER 3 SUBDIVISION AND STABILITY SECTION 1 GENERAL REQUIREMENTS (Delete last sentence and Note in Subsection 3-3-1/9, to read as follows.) 9 Onboard Computers for Stability Calculations (1 July 2007) The use of onboard computers for stability calculations is not a requirement of class. However, if stability software is installed onboard vessels contracted on or after 1 July 2005, it should cover all stability requirements applicable to the vessel and is to be approved by the Bureau for compliance with the requirements of Appendix 3-3-A2, “Onboard Computers for Stability Calculations”. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:28:03 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 4 July 2007 2 ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH . 2006 PART 3 HULL CONSTRUCTION AND EQUIPMENT CHAPTER 3 SUBDIVISION AND STABILITY APPENDIX 2 ONBOARD COMPUTERS FOR STABILITY CALCULATIONS (1 July 2007) (Revise Appendix 3-3-A2, specifically 3-3-A2/Table 1 and 3-3-A2/11.1, as follows.) 1 General 1.1 Scope The scope of stability calculation software is to be in accordance with the stability information as approved by the flag Administration or the Bureau on behalf of the flag Administration. The software is at least to include all information and perform all calculations or checks as necessary to ensure compliance with the applicable stability requirements. Approved stability software is not a substitute for the approved stability information, and is used as a supplement to the approved stability information to facilitate stability calculations. 1.3 Design The input/output information is to be easily comparable with approved stability information so as to avoid confusion and possible misinterpretation by the operator relative to the approved stability information. An operation manual is to be provided for the onboard computer stability software. The language in which the stability information is displayed and printed out as well as the operation manual is written is to be the same as used in the vessels approved stability information. The primary language is to be English. The onboard computer for stability calculations is vessel specific equipment and the results of the calculations are only applicable to the vessel for which it has been approved. In case of modifications implying changes in the main data or internal arrangement of the vessel, the specific approval of any original stability calculation software is no longer valid. The software is to be modified accordingly and reapproved. 3 Calculation Systems This Appendix covers either system, a passive system that requires manual data entry or an active system, which replaces the manual with the automatic entry with sensors reading and entering the contents of tanks, etc., provided the active system is in the off-line operation mode. However, an integrated system, which controls or initiates actions based on the sensor-supplied inputs is not within the scope of this Appendix. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:28:03 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 4 July 2007 ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH . 2006 3 5 Types of Stability Software Three types of calculations performed by stability software are acceptable depending upon a vessels stability requirements: Type 1 Software calculating intact stability only (for vessels not required to meet a damage stability criterion) Type 2 Software calculating intact stability and checking damage stability on basis of a limit curve (for vessels applicable to SOLAS Part B-1 damage stability calculations, etc.) or previously approved loading conditions Type 3 Software calculating intact stability and damage stability by direct application of preprogrammed damage cases for each loading condition (for some tankers etc.) 7 Functional Requirements 7.1 Calculation Program The calculation program is to present relevant parameters of each loading condition in order to assist the Master in his judgment on whether the vessel is loaded within the approval limits. The following parameters are to be presented for a given loading condition: Deadweight data Lightship data Trim Draft at the draft marks and perpendiculars Summary of loading condition displacement, VCG, LCG and, if applicable, TCG Downflooding angle and corresponding downflooding opening Compliance with stability criteria: Listing of all calculated stability criteria, the limit values, the obtained values and the conclusions (criteria fulfilled or not fulfilled) 7.3 Direct Damage Stability Calculations If direct damage stability calculations are performed, the relevant damage cases according to the applicable rules are to be pre-defined for automatic check of a given loading condition. 7.5 Warning A clear warning is to be given on screen and in hard copy printout if any of the loading limitations are not complied with. 7.7 Data Printout The data are to be presented on screen and in hard copy printout in a clear unambiguous manner. 7.9 Date and Time The date and time of a saved calculation are to be part of the screen display and hard copy printout. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:28:03 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 4 July 2007 4 ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH . 2006 7.11 Information of Program Each hard copy printout is to include identification of the calculation program with version number. 7.13 Units Units of measurement are to be clearly identified and used consistently within a loading calculation. 9 Acceptable Tolerances Depending on the type and scope of programs, the acceptable tolerances are to be determined differently, according to 3-3-A2/9.1 or 3-3-A2/9.3. In general, deviation from these tolerances is not to be accepted unless a satisfactory explanation for the difference is submitted for review and the same is satisfactorily confirmed by the Bureau that there would be no adverse effect on the safety of the vessel. Examples of pre-programmed input data include the following: Hydrostatic data: Displacement, LCB, LCF, VCB, KMt and MCT vs. draft Stability data: KN or MS values at appropriate heel/trim angles vs. displacement, stability limits. Compartment data: Volume, LCG, VCG, TCG and FSM/Grain heeling moments vs. level of the compartments contents. Examples of output data include the following: Hydrostatic data: Displacement, LCB, LCF, VCB, KMt and MCT versus draft, as well as actual drafts, trim. Stability data: FSC (free surface correction), GZ-values, KG, GM, KG/GM limits, allowable grain heeling moments, derived stability criteria (e.g., areas under the GZ curve), weather criteria. Compartment data: Calculated Volume, LCG, VCG, TCG and FSM/Grain heeling moments vs. level of the compartments contents The computational accuracy of the calculation program results is to be within the acceptable tolerances specified in 3-3-A2/9.1 or 3-3-A2/9.3, of the results using an independent program or the approved stability information with identical input. 9.1 Calculation Program of the Approved Stability Information Programs which use only pre-programmed data from the approved stability information as the basis for stability calculations are to have zero tolerances for the printouts of input data. Output data tolerances are to be close to zero. However, small differences associated with calculation rounding or abridged input data are acceptable. Additionally differences associated with the use of hydrostatic and stability data for trims that differ from those in the approved stability information are acceptable subject to review by the Bureau. 9.3 Independent Program for Assessment of Stability Programs which use hull form models as their basis for stability calculations are to have tolerances for the printouts of basic calculated data established against either data from the approved stability information or data obtained using the approval authoritys model. Acceptable tolerances shall be in accordance with 3-3-A2/Table 1. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:28:03 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 4 July 2007 ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH . 2006 5 TABLE 1 Acceptable Tolerances Hull Form Dependent Acceptable Tolerance (1) Displacement 2% Longitudinal center of buoyancy, from AP 1%/50 cm max Vertical center of buoyancy 1%/5 cm max Transverse center of buoyancy 0.5% of B/5 cm max Longitudinal center of flotation, from AP 1%/50 cm max Moment to trim 1 cm 2% Transverse metacentric height 1%/5 cm max Longitudinal metacentric height 1%/50cm max Cross curves of stability 5 cm Compartment Dependent Acceptable Tolerance (1) Volume or deadweight 2% Longitudinal center of gravity, from AP 1%/50 cm max Vertical centre of gravity 1%/5 cm max Transverse center of gravity 0.5% of B/5 cm max Free surface moment 2% Shifting moment 5% Level of contents 2% Trim and Stability Acceptable Tolerance (1) Drafts (forward, aft, mean) 1%/5 cm max GMt 1%/5 cm max GZ values 1%/5 cm max FS correction 2% Downflooding angle 2° Equilibrium angles 1° Distance to unprotected openings or margin line from WL, if applicable ±5%/5 cm Areas under righting arm curve 5% or 0.0012 mrad Notes: 1 Deviation in % = (base value applicants value)/base value × 100. 2 Where the “base value” may be from the approved stability information or the results of master computer using an independent program. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:28:03 MDTNo reproduction or networking permitted without license from IHS -,-,- Notice No. 4 July 2007 6 ABS RULES FOR BUILDING AND CLASSING STEEL VESSELS UNDER 90 METERS (295 FEET) IN LENGTH . 2006 11 Approval Procedure 11.1 Conditions of Approval of the Onboard Software for Stability Calculations The onboard software used for stability calculations is subject to approval, which is to include: Verification of type approval, if any, Verification that the data used is consistent with the current condition of the vessel (see 3-3-A2/11.5), Verification and approval of the test conditions, and Verification that the software is appropriate for the type of vessel and stability calculations required. The satisfactory operation of the software with the onboard computer(s) for stability calculations is to be verified by testing upon installation (see 3-3-A2/15). A copy of the approved test conditions and the operation manual for the computer/software are to be available onboard. 11.3 General Approval (optional) Upon receipt of application for general approval of the calculation program, the Bureau may provide the applicant with test data consisting of two or more design data sets, each of which is to include a vessels hull form data, compartmentation data, lightship characteristics and deadweight data, in sufficient detail to accurately define the vessel and its loading condition. Acceptable hull form and compartmentation data may be in the form of surface coordinates for modeling the hull form and compartment boundaries (e.g., a table of offsets) or in the form of pre- calculated tabular data (e.g., hydrostatic tables, capacity tables) depending upon the form of data used by the software being submitted for approval. Alternatively, the general approval may be given based on at least two test vessels agreed upon between the applicant and the Bureau. In general, the software is to be tested for two types of vessels for which approval is requested, with at least one design data set for each of the two types. Where approval is requested for only one type of vessel, a minimum of two data sets for different hull forms of that type of vessel are required to be tested. For calculation software which is based on the input of hull form data, design data sets are to be provided for three types of vessels for which the software is to be approved, or a minimum of three data sets for different hull forms if approval is requested for only one type of vessel. Representative vessel types which require different design data sets due to their hull forms, typical arrangements, and nature of cargo include: tanker, bulk carrier, container carrier, and other dry cargo and passenger vessels. The test data sets are to be used by the applicant to run the calculation program for the test vessels. The results obtained, together with the hydrostatic data and cross-curve data developed by the program, if appropriate are to be submitted to the Bureau for the assessment of the programs computational accuracy. The Bureau is to perform parallel calculations using the same data sets and a comparison of these results will be made against the applicants submitted programs results. 11.5 Specific Approval The Bureau is to verify the accuracy of the computational results and actual vessel data used by the calculation program for the pa