APPROVAL AND CERTIFICATION OF THE SOFTWARE
Contents
1. On line user s task help is provided Lightship weight and lightship weight distribution and associated centres of gravity are protected i e can not be changed by user The Society s imposed structural limitations are protected i e can not be changed by user If included Geometric hull form data are protected i e can not be changed by user Hydrostatic data are protected i e can not be changed by user If included Cross Curves are protected i e can not be changed by user Compartment definitions including frame spacing and centres of volume together with capacity tables sounding ullage tables if appropriate are protected i e can not be changed by user If included Limit curves KG GM are protected i e can not be changed by user Where relevant default group of damage cases are protected i e can not be changed by user Safeguarding against erroneous input such as overfilling of tanks filling same tanks twice ete The following data are presented for each loading condition Clear deadweight definition Light ship data Displacement and centre of gravity Draughts at the perpendiculars and at midship Forward midship and aft draughts at the actual position of the ship s draught marks DET NORSKE VERITAS 12 Classification Not2. Limits for maximum mass in any two adjacent holds as a function of draft Limits to mass in holds as a function of varying angle of repos e Limits to filling heights in tanks as a function of cargo density Limits to distributed loads on decks Control of container lashing Intact Stability criteria are included and presented If relevant calculation and evaluation of severe wind and rolling all deck cargo are included in the windage area If calculation and evaluation of severe wind and rolling criteria are included both the hull above the water line the structure on deck and If relevant calculation of other external heeling moments is in and presented cluded Stored hydrostatics and cross curves are for even keel Stored hydrostatics and cross curves are for the range of trim Limit curve KG GM are for even keel Limit curves KG GM are for range of trim Graphical presentation of GZ curve is included Grain Stability Effect of vertical shift of grain is included filled holds If untrimmed ends are included this can only be calculated for 100 j Damage Stability Damage stability calculation is based on lost buoyancy method Damage stability calculation is based on added weight inethod Free surface effect a
3. N A Not Applicable No refers to Appendix C Guidance for filling in Approval Request Form for Loading Computer software Ref Page Answer to each question should be commented separately and enclosed alternatively reference could be made to actual pages in User s Manual or Program Description To be filled in Place Date On behalf of software producer Naine Position Signature DET NORSKE VERITAS Classification Notes No 21 1 June 1998 15 Appendix C Guidance for Filling in Approval Request Form for Loading Computer Software It should be noted that not all items in the Form are requirements Some of the items are meant for information which may be used in connection with the software approval or the implementation to a specific ship Sore other items may not be applicable to the software in question Reference is made to the Rules for Classification of Ships Pt 6 Ch 9 Sec 1 A400 General software requirements In the coloumn Ref Page No reference to the description of how the particular item is handled by the software should be given The description may be given on a separate sheet or reference could be made to actual pages in User s Manual or Program Description The following guidance should be used when filling in the Approval Request Form L SOFTWARE DESCRIPTION L General Information LI Initial type approval is applicable
4. as given in Appendix B is to be filled in and submitted to DNV It must be clearly stated for what parts of the software the type approval is requested Upon receipt of the filled in form DNV will indicate the fee for type approval Manufacturer and DNV are to agree on applicable test vessels The test vessels can either be standard test vessels provided by DNV or other vessels preferred by the manufacturer The latter can be ships in operation or newbuildings as suitable The test vessels must be for at least two different ship types For calculation programs based on the input of hull form data test data should be provided for three different ship types Tf the DNV standard test ships are applied the necessary ship data ship lines description of compartments light ship data ete will be supplied by DNV For each of the test vessels documentation as required in above 3 3 is to be submitted I e documentation as for specific approval for each of the test vessels Often it is practical to combine the type approval with specific approval for each of the test vessels If the DNV standard test ships are applied the calculations required will be described in the data supplied by DNV definition of cargo and supplies in the test conditions if relevant damage cases etc When the submitted data has been checked and found in order type approval will be given Type approval certificate will be issued Limitations The type
5. If changes affecting the results are made to the software description of the changes is to be submitted and the type approval might have to be renewed To be filled in Place Date On behalf of Software Producer Name EE er Position n Signature DET NORSKE VERITAS 10 Classification Notes No 21 1 June 1998 Appendix B Approval Request Form for Loading Computer Software This approval request form is to be used for specific ships when the software is not type approved It can also be used for application for type approval Reference is made to the Rules for Classification of Ships Pt 6 Ch 9 Sec 1 A400 General software requirements To be filled in Ship Name Name of Ship Yard Ship Yard No Software Producer Name and Address Sofiware Name Software Version no Software Version date Data Operating System Requirements for hardware To be filled in when the approval is for a specific ship usually not relevant to be filled in if the approval request is in connection with general request for type approval It should be noted that not all items in the form are requirements Some of the items are meant for information while some other items may not be applicable to the software or the ship in question Reference is made to the Rules for Classification of Ships Pt 6 Ch 9 Sec 1 A400 General software r
6. defined in the software Approval with respect to intact stability calculations indicates the software can perform intact stability calculations in terms of a GZ curve evaluate and judge the results with respect to the applicable intact stability criteria The intact stability rules regulations which the software can evaluate and judge with respect to should be listed for example IMO Resolution A 749 ES IV Chapter 3 1 Approval with respect to damage stability calculations indicates that the software can perform damage stability calculations evaluate and judge the results with respect to the applicable damage stability criteria The damage stability rules regulations which the software can evaluate and judge with respect to should be listed for example MARPOL 73 78 Regulation 25 Approval with respect to grain stability calculations indicates the software can perform grain stability calculations to be compared with the applicable grain stability criteria The software can take into account grain heeling moments from untrimmed ends DNV towing criteria or others please specify This is in cases where on line remote reading of tank soundings or drafts can be entered automatically into the program It should be stated which quality assurance system has been used for development and testing of the software for example ISO 9000 3 It is important that the software producer has implemented a quality assurance system
7. in connection with the first time DNV type approval of the software is applied for The type approval is valid for four years from the type approval date or to a new version of the software is produced A new version of the software should be given when significant software alterations affecting the results are carried out Type approval of stability and longitudinal strength software is rendered on a voluntary basis Such type approval wifl make the approval process for a specific ship easier and reduces cost Less documentation will be required and less fee will be charged 12 Software is to be approved for each ship where it is installed 1 3 The approval of the software is valid for mono hull ships only 1 4 If the approval is requested for arbitrary floating structures a special agreement on testing will have to be made The software must have possibility to calculate stability about any arbitrary axis 1 5 Approval with respect to longitudinal strength means that the software calculates the longitudinal strength of given loading conditions in terms of shear forces and bending moments and checks these against approved limit curves defined in the software 1 6 17 1 8 1 1 9 1 1 10 1 12 1 13 Approval with respect to stability limit curves means the software calculates the stability of given loading conditions in terms of KG or GM and checks these against approved limit curves
8. should be given if limits are exceeded 5 3 The software should be capable of incInding and storing approved limits to maximum filling height in any tank as function of cargo density and show ntilisation of limit values A warning should be given if limits are exceeded 5 4 The software should be capable of including and storing approved limits to distributed loads on decks and show utilisation of limit values A warning should be given if limits are exceeded 55 57 The software should be capable of controlling container and container lashing strength related to stack height weight and the ship s GM and selected lashing arrangement Intact Stability The method by which initial GM is corrected for free surface effect of slack tanks should be described The lower and upper limits of tank level for calculating the free surface effect are to be given A correction based on a virtual increase of KG based on maximum moment of inertia of slack tanks may be accepted The method by which initial GM is corrected for free surface effect of 98 full tanks should be described correction based on a virtual increase of KG based on moment of inertia at 98 tank level may be accepted or by applying the vertical centre gravity of full tank The latter method is not recommended for very wide tanks as the free surface effect can be under estimated The method for which GZ values in intact condition are corrected for free
9. 2 4 Minimum GM Maximum KG due to stability 2 12 5 Maximum trim due to range of trim covered by stored hydrostatic data cross curves limit curves or others 2 12 6 Cargo tanks and ballast filling strength stability e g when ballast tanks surrounding empty cargo compartments are to be kept full etc 2 12 7 Cargo tank filling height as a function of cargo density strength 2 12 8 Cargo compatibility with respect to type of cargo in adjacent compartments 2 12 9 Limits to distribute loads on deck the weights on a given deck shall de limited by strength for which the deck is approved 2 12 10 Clear warning is given if the loading limitations are not fulfilled 2 13 Calculation of tank capacities and centre of gravity is included with trim correction 2 14 Graphical presentation of loading conditions is ineluded 2 15 Integration and interpolation method and limitations 2 16 Tteration limits 2 17 If on line interface possibility is provided for manual input DET NORSKE VERITAS Classification Notes No 21 1 June 1998 13 Longitudinal Strength Control of stillwater shear force against limit values Correction of shear forces for bulk carriers Correction of shear forces for tankers Control of stillwater bending moment against limit values Control of stillwater stresses including torsion Local Strength Limits for maximum mass in any hold as a function of draft
10. approval is valid only for the calculation results Le the type approval is a confirmation that the software is able to give correct results provided that the stored characteristic data of the vessel and the user s input is correct Renewal The type approval is valid only for an identified specific version of the software Whenever the software is revised the type approval is no longer valid In order to get a renewal of the type approval the manufacturer has to submit the details of the revision and DNV will decide the extent of testing required The Type Approval Certificate will remain valid for a period of four years The Certificate will be renewed upon confirmation from the manufacturers of the calculation program that the calculation algorithms remain unchanged Documentation according to the Rules for Classification of Ships Classification Notes No 21 1 Pt 4 to be submitted to DNV for approval l DNV check the documentation and return the type approval certificate Figure 2 Flow chart summarising procedure for type approval DET NORSKE VERITAS Classification Notes No 21 1 7 June 1998 Appendix A Approval Request Form for Type Approved Loading Computer Software To be filled i Ship Name Name of Ship Yard Ship Yard Building No Software Producer Name and Address Software Name Software Version No Software Version Date Type Approval Certi
11. aq VEO CLASSIFICATION NOTES No 21 1 e APPROVAL AND CERTIFICATION OF THE SOFTWARE OF LOADING COMPUTER SYSTEMS JUNE 1998 DET NORSKE VERITAS Veritasveien 1 N 1322 H vik Norway Tel 47 67 57 99 00 Fax 47 67 57 99 11 FOREWORD DET NORSKE VERITAS DNV is an autonomous and independent Foundation with the object of safeguarding life property and the environment at sea and ashore DET NORSKE VERITAS AS DNV AS a fully owned subsidiary Society of the Foundation undertakes classification and certification and ensures the quality of ships mobile offshore units fixed offshore structures facilities and systems and carries out research in connection with these functions The Society operates a world wide network of survey stations and is authorised by more than 120 national administrations to carry out surveys and in most cases issue certificates on their behalf Classification Notes Classification Notes are publications which give practical information on classification of ships and other objects Examples of design solutions calculation methods specifications of test procedures as well as acceptable repair methods for some components are given as interpretations of the more general rule requirements An updated list of Classification Notes is available on request The list is also given in the latest edition of the Introduction booklets to the Rules for Classification of Ships the Rules for Classificat
12. comparing 5 calculated stillwater bending moments with limit values for seagoing and harbour conditions as 5 1 3 5 4 1 42 4 3 44 45 46 relevant and show the utilisation of the limit values Reduced limits for bulk carriers in alternate loading conditions should be available The control may be performed continuously along the ship s length or alternatively related to specified check points see 2 4 1 If specified check points are used the software should also control the bending moment maxima between the check points A warning should be given if the limit values are exceeded The software should have the possibility of controlling longitudinal stresses including torsion and show the utilisation of the allowable values A warning should be given if the limits are exceeded Local Strength 52 Where applicable the software should be capable of including and storing approved limits for maximum mass in any hold as a function of draught and show utilisation of limit values A warning should be given if limits are exceeded The software should be capable of including and storing approved limits for maximum mass in any two adjacent holds as a function of draught and show ntilisation of limit values A warning should be given if limits are exceeded The software should be capable of including and storing approved limits for mass m holds for varying angle of repose and show utilisation of limit values A warning
13. eans that DNV approves the software for a specific installation onboard a specific vessel The approval is based on a review and acceptance of design calculation method verification of stored data and test calculations for the specific vessel Approval of the software is to be carried out for each specific vessel where the software is to be installed Approval of the software results in approved test conditions If the software is type approved the review and acceptance of design is not necessary for each specific vessel Only verification of user s manual stored data and test calcu lations for the specific vessel will then be carried out Certification installation testing is carried out to ensure that the loading computer system works properly onboard the specific vessel and to ensure that the correct approved version of the software has been installed Certification is to be carried out for each vessel where a loading computer system has been installed Loading Computer Certificate DNV Form no 60 00a is issued 2 3 Type approval Type approval means that DNV has approved the design methods and specifications of the software in general The type approval is given based on a review and acceptance of design calculation methods and documented test results for at least two test vessels Type approval certificate is issued In the type approval certificate it will be stated what kind of calculations the type approval cove
14. equirements To be ticked off x No e Software Description s No NA Ref Page Approval is requested in connection with initial type approval Approval is requested in connection with approval for a specific ship Approval is requested for calculations for mono hull ships only Approval is requested for calculations for arbitrary floating structures The approval is with respect to strength Approval is with respect to stability limit curves The limit curves cover the following stability regulations esaii a de sle Approval is with respect to intact stability calculation including evaluation of criteria against GZ curve DET NORSKE VERITAS Classification Notes No 21 1 June 1998 11 Intact stability regulations Approval is with respect to damage stability calculation including evaluation of criteria against GZ curve Damage stability regulations Approval is with respect to grain stability Grain stability for untrimmed ends Approval is with respect to other applications and regulations Approval includes on line interface Readings used as on line input Quality assurance system applied for development and Approval given by other authorities or classification societies General Software Specifications
15. es No 21 1 June 1998 2 11 6 Provision made available for the introduction of a longitudinal deflection 2 11 7 Trim clearly referring to a reference length 2 11 8 Transversal metacentric height KM 2 11 9 Initial metacentric height GM 2 11 10 Free surface moment from slack tanks 2 11 11 Free surface correction on the initial metacentric height k 2 11 12 Free surface correction on the GZ curve 2 11 13 Flooding angle presented and included in the stability criteria control 2 11 14 Listing of all relevant stability criteria description of the criteria the limit values and the obtained values 2 11 15 Where applicable effect of external heeling inoments 2 11 16 Shear forces bending moments torque and local strength as well as the limiting values for those parameters 2 11 17 Loading condition results of strength and stability calculation are included 2 11 18 Judgement of each loading condition with respect to all actual strength and stability criteria is clearly shown pr 2 11 19 Clear warning is given if any of the actual strength and or stability criteria are not fulfilled ceeeee eee Sela RLD Loading limitations are included values to be included in stored characteristic data 2 12 1 Minimum draft due to slamming 2 12 2 Maximum draft load line draft 2 123 Maximum GM to limit sloshing in slack tanks 2 1
16. ficate No Type Approval Expiring Date It should be noted that not all items in the form are requirements Some of the items are meant for information while some other items may not be applicable to the software or the ship in question Reference is made to the Rules for Classification of Ships Pt 6 Ch 9 Sec 1 A400 General software requirements To be ticked off X Software Description General Information The type approval covers all the strength and stability applications as calculated for this actual vessel The approval is with respect to strength Approval is with respect to stability limit curves The limit curves cover the following stability a n A AT A A siiin Approval is with respect to intact stability calculation including evaluation of criteria against GZ curve Intact stability regulatio Approval is with respect to damage stability calculation including evaloation of criteria against GZ curve Damage stability regulations Approval is with respect to grain stability Grain stability for untrimmed ends Approval is with respect to other applications and regulations DET NORSKE VERITAS 8 Classification Notes No 21 1 June 1998 General Software Specifications Loading limitations are included and the values are included in the stored characteristic data Minimum draft due to slamming Maxim
17. imits to filling heights in tanks as a function of cargo density Limits to distributed loads on decks Control of container lashing DET NORSKE VERITAS Classification Notes No 21 1 9 June 1998 Stability If relevant calculation and evaluation of severe wind and rolling criteria are included and presented If calculation and evaluation of severe wind and rolling criteria are included both the hull above the water line the structure on deck and all deck cargo are included in the windage area If relevant calculation of other external heeling moments is included and Limit curve KG GM is for even keel Limit curves KG GM are for range of trim mmnserernorvorvarnerenennananenrer Documentation to submit Filled in approval request form this form User s Manual Test Conditions Stored Characteristic data The documentation is in accordance with the approved onboard Loading and Stability documentation The documentation is as listed in DNV Rules For Ships Pt 6 Ch 9 Sec 2 Alterations to the Software Are alterations affecting the results carried out N A Not Applicable No refers to Appendix C Guidance for filling in Approval Request Form for Loading Computer software A new version of the software should be given when significant software alterations affecting the results are carried out
18. in connection with the development and testing of the software Reference to approval given by authorities and other classification societies should be given DET NORSKE VERITAS 16 Classification Notes No 21 1 June 1998 TI 21 22 2 3 2 8 2 9 2 11 2 12 SOFTWARE SPECIFICATIONS General Software Specifications On line user s task help means that the software system provides on line help for input output printing etc to perform these functions and evaluate the results Stored lightweight data must be reasonably protected from accidental alterations A special procedure should be established if alterations of these data are necessary Stored geometry characteristic data i e hull definition compartment definition openings and hydrostatic tables stability curves etc must be reasonably protected from accidental alterations A special procedure should be established if alterations of these data are necessary A group of damage cases corresponding to the damage cases in the approved stability documentation Not to be changed after approval The software design should be such that it limits possible input errors by the user For example it should not be possible to input a volume in a tank that exceeds the tank s total volume or it should not be possible to change the position of the compartments when positioning solid weights related to a given compartments such as stores or swimuning poo
19. ion of Mobile Offshore Units and the Rules for Classification of High Speed and Light Craft In Rules for Classification of Fixed Offshore Installations only those Classification Notes which are relevant for this type of structure have been listed Comments may be sent by e mail to dip203 dnv com For subscription orders or information about subscription terms please use distribution dnv com Comprehensive information about DNV and the Society s services is found at the Web sile http www dnv com Det Norske Veritas AS 1998 Data processed and typeset by Division Technology and Products Det Norske Veritas AS Printed in Norway by Det Norske Veritas AS 98 06 05 11 57 CN21 1 doc 6 98 2000 Zy peso sles lase ar dage which is prove I ve bee casal by negligent actor arission of Det Nereke Veritas then Del Norske Veritas shall pay corrpensation Ip such persan for Adeo the Corparsaten sel nat 8600 an aroun equ 10 ten res De fee cevged kr re sevice n geston Fodder ta he redam oorpensaien stall never exceed USD 2 millon In this provision Det Nerse Veritas shall mean the Foundation Det Norske Veritas as weil as al its subsidaries drectors officers employees agents and ary other acting an behalf of Del Norske CONTENTS 1 Introduction 4 2 Definitions 4 21 Loading Computer System 4 2 2 Approval and certification for a specific vessel 4 23 Type approval 4 3 How to Obtain Approval and Certifica
20. ls Relevant data to be presented for each loading condition K should be described whether the software takes into account applicable loading limitations such as maximum draft not to exceed freeboard marks minimum draft due to strength considerations slamming e maximum trim in cases where limit curves are approved for specified limited trim gt minimum GM to satisfy the applicable stability requirements e maximum GM to limit sloshing in slack tanks e limits on cargo tanks or ballast tanks filling due to strength or stability considerations for example when ballast tanks surrounding empty cargo compartments are to be kept full etc e maximum tank filling as a function of liquid cargo density as approved with respect to strength and stability e cargo compatibility with respect to types of cargo in adjacent compartments limits to distributed loads on deck the weights on a given deck shall be limited by 2 13 2 14 2 15 2 17 3 2 the strength for which the deck is approved warning should be given if any loading limitation is exceeded Tt should be stated whether the software calculates liquid contents taking trim into account If not a note should be made in the user s manual to draw the attention to possible correction for loading conditions with significant trim The software should provide the possibility of graphical presentation of the loading condition in order
21. ng trim The software should provide for graphical presentation of GZ curve in intact condition Grain Stability To be same as in approved Grain Loading Manual Damage Stability need only to answered if the software checks against damage stability limit curves only It should be stated whether the damage stability calculations are based on lost buoyancy method This method is preferable It should be stated whether the damage stability calculations are based on added weight method The method by which GZ values in damaged condition are corrected for free surface effect of slack tanks should be described Normally GZ is corrected based on the actual heeling moment due to shifting of liquid or GZ is corrected based on an assumed heeling moment due to shifting of liquid at 5 degrees MARPOL or a virtual increase of initial KG is assumed based on maximum moment of inertia of slack tanks If damaged tanks contain liquida before the assumed damage the software should take this into account by assuming such initial liquid contents flow out before filling the damaged compartment with sea water For checking damage stability of a planned loading condition a default list of damage cases should be stored so the user run damage stability calculations applying these pre defined damage cases For checking damage stability of a current or planned loading condition the user may defme other certain damage cases t
22. o run damage stability calculations for those defined damage cases 7 7 7 8 712 7 16 8 8 1 8 7 Calculation of equilibrium position after damage should include e draft forward and aft and mean draft trim e heel angle distance between equilibrium water line and down flooding openings e residual GM The software should calculate the righting lever GZ curve in damaged condition including correction for the free surface effect at intervals of heeling angles not exceeding 5 degrees up to at least 50 degrees The software should calculate damage stability results based on the righting lever GZ curve including correction for the free surface effect such as equilibrium position and value of residual GM as well as the area under GZ curve between equilibrium and 20 degrees value of maximum GZ between equilibrium and 20 degrees or down flooding angle if this is less When applicable the software should calculate damage stability taking into account a defined external heeling moment such as passenger heeling moment wind heeling moment or launching of life boats It should be stated whether the software can calculate intermediate stages of flooding and how such calculations are performed The software should provide for graphical Presentation of the equilibrium position after damage and GZ curve in damaged condition Documentation to be submitted To be in accordance with the Rules for Classificati
23. on of Ships Pt 6 Ch 9 Sec 2 Det NORSKE VERITAS
24. otes No 21 1 5 June 1998 Approval Documentation according to the Rules for Classification of Ships Pt 6 Ch 9 Sec 2 to be submitted to DNV for approval DNV check the documentation and return approved test conditions Test for certification installation testing is to be carried out either onboard or at the manufacturer Certification Fn _ Either or Test for certification at the manufacturer Test for certification onboard The test is to be witnessed by a DNV Surveyor I The test is to be witnessed by the DNV Surveyor The DNV Surveyor witnessing the test issues the Loading Computer Certificate The DNV Surveyor witnessing the test issues the Loading Computer Certificate Master is to Verify that approved loading computer software is installed on hardware as listed in the loading computer certificate Verify that the system works properly onboard Sign and submitted to DNV the test conditions as calculated and printed onboard Figure 1 Flow chart summarising procedure for approval and certification of Loading Computer System for a specific ship see the Rules for Classification of Ships Pt 6 Ch 9 DET NORSKE VERITAS Classification Notes No 21 1 June 1998 4 How to Obtain Type Approval The following stepwise procedure applies D 2 3 4 5 The form Approval Request Form for Loading Computer Software
25. rs The type approval will be included in the DNV register of Type Approved Products file no 780 90 In connection with approval for a specific ship with type approved software less documentation will be required and less fee will be charged 3 How to Obtain Approval and Certification for a Specific Vessel The following stepwise procedure applies 1 The Approval request Form is to be submitted For type approved software use the form Approval Request Form for Type Approved Loading Computer Software as given in Appendix A For not type approved software use the form Approval Request Form for Loading Computer Software as given in Appendix B It must be clearly stated for what parts of the software the approval is requested 2 Upon receipt of the filled in form DNV will indicate the fee for the approval and certification Fees of approval are dependent on the applications to be approved These fees are reduced for type approved software and they are reduced for sister vessels 3 Documentation as listed in the Rules for Classification of Ships Pt 6 Ch 9 Sec 2 is to be submitted for approval 4 When the submitted data has been checked and found m order the approved test conditions will be returned 5 When the software has been approved for the specific vessel certification is to be carried out as described in the Rules for Classification of Ships Pt 6 Ch 9 Sec 3 DET NORSKE VERITAS Classification N
26. s a correction to GZ values is included Correction for initial contents of damaged tanks is included A default list of damage cases is included Possibility of defining damage cases is included DET NORSKE VERITAS Classification Notes No 21 1 June 1998 7 7 Calculation of equilibrium position after damage is included draft trim and heel hs 78 Calculation of GZ curve is included 79 Unprotected openings are included and taken into account in the program 7 10 Weathertight openings are included and taken into account in the ji program 4 7 11 Tf relevant internal openings openings between sections or compartmenis inside the ship are included and taken into account in the program 7 12 Evaluation with respect to all actval damage stability criteria is included 7 13 Where relevant calculation of external heeling moments is included 7 14 Calculation of intermediate stages of flooding EAS Graphical presentation of equilibrium position and GZ residual curve 8 Documentation to Submit 8 1 Filled in approval request form this form ppr eq 82 User s Manual 8 3 Program Description 8 4 Test Conditions 8 5 Stored Characteristic data 8 6 The documentation is as listed in DNV Rules for Classification of Ships Pt 6 Ch 9 Sec 2 87 The documentation is in accordance with the approved onboard Loading and Stability documentation
27. surface effect of slack tanks is to be described Normally a virtual increase of KG is assumed based on maximum moment of inertia of slack tanks or GZ is corrected based on the actual heeling moment due to shifting of liquid or GZ is corrected based on a hecling moment due to shifting of liquid calculated according to Appendix I of IMO Resolution A 167 ES IV The software should calculate the righting lever GZ curve in intact condition including correction for the free surface effect at intervals of heeling angles not exceeding 5 degrees up to at least 40 degrees The software should calculate intact stability based on the righting lever GZ curve including correction for the free surface effect such as area under GZ curve between 0 30 degrees 0 40 degrees 30 40 degrees angle of maximun GZ value of maximum GZ between 30 40 degrees or down flooding angle if this is less than 40 degrees as well as value of initial GM Extemal heeling moments shonld be calculated as in onboard stability booklet or according to applicable rules External moments may be moments due to wind passenger heeling towing or others DET NORSKE VERITAS 18 Classification N tes No 21 1 June 1998 5 8 5 11 6 1 6 2 7 1 72 7 3 74 7 5 7 6 Stored data should be for the range for trim desired to calculate If based on even keel data only the accuracy of the stability calculations will decrease with increasi
28. tion for a Specific Vessel 4 How to Obtain Type Approval Appendix A Approval Request Form for Type Approved Loading Computer Software Appendix B Approval Request Form for Loading Computer Software Appendix C Guidance for Filling in Approval Request Form for Loading Computer Software AS DET NORSKE VERITAS Classification Notes No 21 1 June 1998 1 Introduction This Classification Note is a guidance for those who are involved in the approval and certification of a Loading Computer System for a specific ship T e the software manufacturer who wish to have his software approved for a specific ship or the yard which needs an approval and certification of the Loading Computer System installed on board a vessel they are about to deliver Requirements for Loading Computer Systems for specific ships are given in the Rules for Classification of Ships Pt 6 Ch9 This Classification Note is also guidance for those manufacturers who wish to have their software type approved 2 Definitions 2 1 Loading Computer System A loading computer system is a computer based system for calculation and control of loading conditions for compliance with the applicable stability longitudinal and local strength requirements The loading computer system consists of software calculation program and the computer hardware on which it runs 2 2 Approval and certification for a specific vessel Approval of software m
29. to verify input of loads The integration and interpolation method and limitations should be described The number of intervals should be sufficient to provide accurate integration and interpolation The iteration out off limits should not exceed 1 of the reverting value for on board software These limits can be obtained by comparing results from the latest two iterations The number af iterations should be limited to avoid infinite loops If the obtained results are not within the above limits a warning should be given For systems with on line interface it should also be possible to enter data manually for planning of load conditions In case of failure of an on line interface an error message should be given Longitudinal Strength The software shall be capable of comparing calculated corrected stillwater shear forces with limit values for seagoing and harbour conditions as relevant and show the utilisation of the limit values This control may be performed continuously along the ship s length or alternatively related to specified check point A warning should be given if the limit values are exceeded For correction of shear forces for bulk carriers reference is made to the Rules Pt 3 Ch 1 Sec 5 D200 For correction of shear forces for tankers reference is made to the Rules Pt 3 Ch 1 Sec 5 D300 amp D400 DET NORSKE VERITAS Classification Notes No 21 1 17 June 1998 3 4 The software shall be capable of
30. um draft load line draft Maximum GM to limit sloshing in slack tanks Miniinuin GM Maximum KG due to stability Maximum trim due to range of trim covered by stored hydrostatic data cross curves limit curves or others Cargo tanks and ballast filling strength stability for example when ballast tanks surrounding empty cargo compartments are to be kept full etc Cargo tank filling height as a function of cargo density strength Cargo compatibility with respect to type of cargo in adjacent compartments Limits to distribute Joads on deck the weights on a given deck shall be limited by strength for which the deck is approved Clear warning is given if the loading limitations 1 6 1 7 1 8 1 9 and 2 12 are not fulfilled Calculation of tank capacities and centre of gravity is included with trim correction Longitudinal strength Control of stillwater shear forces against limit values Correction of shear forces for bulk carriers Correction of shear forces for tankers Control of stillwater bending moment against limit values Control of stillwater stresses including torsion Local Strength Limits for maximum mass in any hold as a function of draft Limits for maximum mass in any two adjacent holds as a function of draft Limits to mass in holds as a function of varying angle of repose L
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