The following rule booklets have been amended in January 2007:
Part 1 General Regulations
Chapter 1 General Regulations
Part 3 Hull and Equipment –
Main Class
Chapter 1 Hull Structural Design, Ships with Length 100 metres and above
Chapter 2 Hull Structural Design, Ships with Length less than 100 metres
Chapter 3 Hull Equipment and Safety
Part 4 Machinery and Systems – Main Class
Chapter 2 Rotating Machinery, General
Chapter 3 Rotating Machinery, Drivers
Chapter 4 Rotating Machinery, Power Transmission
Chapter 5 Rotating Machinery, Driven Units
Chapter 7 Boilers, Pressure Vessels, Thermal-Oil Installations and Incinerators
Chapter 8 Electrical Installations
Chapter 14 Steering Gear
Part 5 Special Service and Type – Additional Class
Chapter 1 Ships for Navigation in Ice
Chapter 2 Passenger and Dry Cargo Ships
Chapter 4 Chemical Carriers
Chapter 5 Liquefied Gas Carriers
Chapter 6 Fishing Vessels
Chapter 7 Tugs, Supply Vessels and Other Offshore/Harbour Vessels
Chapter 10 Ships for Carriage of Refrigerated Cargoes
Chapter 14 Naval and Naval Support Vessels
Part 6 Special Equipment and Systems – Additional Class
Chapter 1 Miscellaneous Notations
Chapter 3 Periodically Unattended Machinery Space
Chapter 4 Additional Fire Protection
(F-AMC)
Chapter 9 Loading Computer Systems (LCS) for Stability and Longitudinal Strength
Chapter 10 Vapour Control Systems
Chapter 12 Environmental Class
Chapter 13 Gas Fuelled Engine Installations
Chapter 16 NAV-O Class Notation
Part 7 Ships in Operation
Chapter 1 Survey Requirements
Part 8 IACS Common Structural Rules
Chapter 1 Common Structural Rules for Double Hull Oil Tankers with Length 150 metres and above
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Rule changes.
The following changes may be of special interest:
Class notation NAV-O
Restriction in use of Class notation NAV-O has been removed.
There are a number of vessels being transferred to DNV class that have an additional class notation for nautical safety from the loosing society. As the additional class notations for nautical safety developed by DNV is different due to the basic concept applied it is in many cases not possible to assign the requested additional class notation. In order to cope with this NAV-O was developed and came into force on 1 July 2004, however with the limitation that such ships shall have been constructed before 1 July 2002.
The possibility of offering the NAV-O notation to class entry vessels built after
1 July 2002 is equally important as for older vessels; hence the restriction has been removed.
Class notations PIMS(HULL)
Class notations PIMS(HULL) for inspection and maintenance of hull has been introduced. PIMS-HULL will encourage introduction of owner’s hull inspection schemes for primarily tankers and container ships. By implementing the PIMS-HULL the owner will get better control of the structural condition on board their ships and the performance of the system is monitored by class. This is a mean for quality owner to market towards oil majors, cargo owners, liner operators and other stake holders that they are in control of ships hull condition. By introduction of PIMS-HULL DNV will also have access to records from owners/managers hull inspections. This may be used in connection with preparation of periodical hull surveys by DNV.
Rotating Machinery – General
Alignment with IACS UR M3 for speed governing for emergency generator sets including diesel engines has been performed.
Rotating Machinery – Diesel Engines
The design of diesel engine foundations, including such details as thermal expansion and where to fit stoppers, is considered to be the task the diesel engine manufacturer rather than the yard. This also corresponds to actual practice where the yard consults the engine manufacturers. Yards may influence the chocking thickness; however this is of minor significance as long as it is not extreme in any direction compared to bolt pre-stress.
The yard has been responsible for torsional vibration calculations (tvc). Normally the engine manufacturers carry out these calculations on behalf of the yards, but sometimes these tasks are outsourced to other sub-suppliers. Such sub-suppliers often use disclaimers that make the analysis invalid, i.e. only accepting responsibility for their own delivery. This is not acceptable to DNV because a tvc shall deal with both calculated vibration levels and the permissible levels for all components in the system. Text corresponding to this issue has been introduced.
Shipboard testing of propulsion engines has been aligned with IACS M51, as appropriate, and to be more in line with reported practice.
Rotating Machinery – Shafting
In 2001 the rules for shafting was thoroughly revised and in 2005 the IACS UR M68 for shafting was implemented in the Rules. Technical corrections and improvements have been implemented in this revision of the rules.
Rotating Machinery – Propellers and Thrusters
Through consultancy services related to damage investigations of propellers, DNV have gained significant knowledge related to the loads and corresponding responses in the pitch mechanism. Further, recent DNV research and development work has resulted in novel calculation technology for analytical strength calculations – both for propeller blades and pitch mechanism. Combined with experiences from existing calculation practice, improved calculation methods are proposed – additionally presented in detail in a separate proposal to update the CN.41.5.
The limit for not requiring torsional vibration calculations for auxiliary thrusters has been set to 500 kW, as for other auxiliary installations.
Azimuth speed, design criteria has been aligned with actual test criteria.
Boilers, Pressure Vessels, Thermal oil installations and Incinerators
Paragraph regarding ultrasonic testing in lieu of radiographic testing has been added to be in line with practice.
Electrical installations
The rules have been updated to be in line with amended IEC and IACS requirements. Section 7 has in addition been rearranged. Miscellaneous references have been updated and some requirements re-arranged for readability. A number of paragraphs have been deleted, as the requirements are covered in other parts of the rules.
New concept of Hazardous Area Zones has been implemented for selection of EX protected electrical equipment.
Ships for navigation in Ice
The rules have been updated by implementation of IACS UR I1, and the Finnish Maritime Authority’s (FMA) new definition of the maximum and minimum ice class draughts and marking of ice draught when limited below the maximum ‘Summer Fresh water’ line.
Liquefied Gas, Oil and Chemical Carriers and Gas Fuelled Engine Installations
The rules have been changed mainly due to adoption of Hazardous Area Zones
0, 1 and 2 instead of Concept of Gas Safe/ Dangerous Zones and Spaces.
55th session of Marine Environment Protection Committee (MEPC), 9–13 October 2006
The International Maritime Organisation’s (IMO) MEPC Committee discussed and adopted relevant issues related to protection of the environment. A summary is given below.
The phasing in of ballast water treatment technologies to prevent spread of harmful aquatic organisms remains as is. This means that some vessel shall have in place a type approved ballast water treatment system upon delivery.
The work on the proposed new convention on recycling continues, to meet the schedule of adopting the convention by 2008/2009.
Amendments made to mandatory instruments:
The Southern South African Waters was adopted as a MARPOL Annex I (on Oil) Special Area
Amendments to Condition Assessment Scheme (CAS) was adopted
Revised MARPOL Annex III (on Harmful Substances in Packaged Form) was adopted and will enter into force on 1 January 2010
Amendments to the Guidelines for the transport and handling of hazardous and noxious liquid substances in bulk on offshore support vessels
Amendments to chapters 17, 18 and 19 of the revised IBC Code
Interpretation of MARPOL Annex I requirement for prompt access to computerised shore-based damage stability and residual structural strength calculation programs
Interpretation of MARPOL Annex IV (on Sewage) for shore discharge pipeline and the relevant shore connection flange
The Committee is also working on:
regulations and guidelines related to bilge systems and bilge discharge criteria.
Review of MARPOL Annex V (on Garbage)
For additional information, see http://exchange.dnv.com > Rules and Regulations
DNV contacts: Eivind.Haugen@dnv.com and Karl.Rygh@dnv.com
New IACS Unified Requirement (UR) for Hull Surveys of New Constructions
The document was published by the International Association of Classification Societies (IACS) and will be implemented by IACS Societies on ships contracted after 1 January 2008. It includes the following main activities:
Examination of the parts of the ship covered by classification rules and by applicable statutory regulations for hull construction, taking account of the relevant approved drawings.
Appraisal of the manufacturing, construction, control and qualification procedures, including welding and assemblies, with indication of relevant inspections and approval tests and specifying the items to be examined and or tested and how and by whom.
Appraisal of material and equipment used and their inspection at works is not included in this UR. These requirements are covered by other URs. These items are surveyed at the manufacturer’s works and appropriate certificates are issued.
For additional information, see IACS website
Date: 2007-10-09