Pt.1 Ch.1 General Regulations
Main changes coming into force January 2006

Sec.2 Scope of Rules and Classification Notations

• Table B2 has been modified to cover the new class notations WINTERIZED (design temp °C) and WINTERIZED ARCTIC (design temp °C).

• Table B14 has been modified to include the supplementary class notation (navdist) and the class notation F-NAVAL has been substituted by FIRENAV.

• A new Table B18 has been inserted to cover the class notations EP-1(a%)(+), EP-2(a%)(+) and EP-3(a%)(+) introduced by the new rule chapter Pt.6 Ch.19 “Emergency Propulsion”. The subsequent tables have been re-numbered accordingly.

Main changes coming into force 1 April 2006
Sec.2 Scope of Rules and Classification Notations

• Table B3 has been modified to cover the common structural rules for bulk carriers with L ≥ 90 m (IACS) and the introduction of the related class notation CSR.

• Table B4 has been modified to cover the common structural rules for double hull oil tankers with L ≥ 150 m (IACS) and the introduction of the related class notation CSR.

Pt.3 Ch.1 Hull Structural Design, Ships with Length100 metres and above
Main changes coming into force January 2006

Sec.2 Materials and Material Protection

• Item B402 has been changed reflect that the selection of materials shall be based on Pt.5 Ch.1 Sec.4 B.

Sec.16 Fatigue Control

• Item A502 has been changed so that the January 2005 version of Pt.3 Ch.1 Sec.16 A502 has been retained.

Main changes coming into force 1 April 2006
Sec.1 General Requirements

• Sub-section element A100 “Application” has been modified to exclude tankers with class notation CSR. CSR is an additional class notation applicable to ships designed and built according to common structural rules for double hull oil tankers, covered by Pt.5 Ch.3.

Main changes coming into force July 2006
Sec.1 General Requirements

• The BIS notation has been extended to include requirements for survey arrangements for thrusters.

Pt.4 Ch.2 Rotating Machinery, General
Main changes coming into force July 2006
Sec.1 Introduction

• Table A1 has been updated.

Sec.2 Certification Principles

• In item A102, text concerning the 200 kW and 500 kW auxiliary machinery limitations has been made into a new Guidance note.

• In item C104, new text has been added to clarify that the MSA shall contain reference to Sec.3 A102.

Sec.3 Design and Documentation

• In item A205, new text has been added to clarify that blanks for gears may be considered as equivalent to separate forgings, provided that a special forging process has been approved by DNV.

• A new sub-section element, A300 "Welding specification" has been added and the new item A301 details the welding specification.

• Item B102 has been rewritten to clarify the requirements for a NV certificate.

• In item B202, text concerning cleanliness specifications has been made into a Guidance note.

Sec.4 Electrical Power Generation

• To meet the requirements in SOLAS Ch.II-1/Reg.41.5 and Ch.II-1/Reg.41.2 and IACS UI SC157, text has been added in item A104 and text has been removed in item A105.

Pt.4 Ch.3 Rotating Machinery, Drivers
Main changes coming into force July 2006

General

• Welded cylinder frames designs have been covered.
• New IACS safety valves and crankcase ventilation requirements have been adopted.
• Turbocharger monitoring: requirements in conflict with current practice have been removed, and requirements have been clarified.
• Starting air system: clarification of requirements.
• Workshop testing: to allow for current practice for smaller engines, minimum time limit for the load steps has been removed.
• Crankcase protection device: differentiation in requirements between crosshead and trunk engines has been made.
• Assembly and installation practice for crosshead engines has been accounted for.
• Torsional vibrations: clarification of requirements.
• Steam turbines: corrected IACS requirements have been adopted.

Pt.4 Ch.4 Rotating Machinery, Power Transmission
Main changes coming into force July 2006

General

• New IACS requirements for shafts have been adopted.
• Redefinition of “load cycles” for Baltic ice classes has been made. ICE -05 to -15 have to be applied in gear rating calculations and the requirements have been aligned with Pt.5 Ch.1.
• The ice criteria for elastic couplings have been updated.
• Monitoring requirements have been changed.

Sec.1 Shafting

• B200: "simplified method" for calculating shaft dimensions, has been fully revised.
• B300: modified requirements for flanged connection in consequence of and reflecting the changed shaft dimension calculation above, have been introduced.
• B400: requirements relating to all shrink fit connections (incl. propeller) have been totally revised, with new formulae introduced for "pull up lengths" and diametrical expansions.
• New friction capacity criteria for keyless propeller fitting have been introduced.
• E300: the requirement for alarm for thrust bearing temperature has been modified (lowered to 5 000 kW from 10 000 kW), as well as for oil lubricated fluid film bearings.
• H200: requirements related to installation inspections for propellers have been modified, reflecting the above design requirement for shafting and shrink fitting.

Sec.2 Gear Transmissions

• B200: the number for load cycles has been modified (down from 3 . 106 to 106) for gear calculations.

Sec.5 Torsionally Elastic Couplings

• B200: the dimension criteria for calculating elastic coupling connections have been totally revised.

Pt.4 Ch.5 Rotating Machinery, Driven Units
Main changes coming into force July 2006

Sec.1 Propellers

• Table B1: the material constant for martensitic stainless steel has been modified.

• Table E1: various modifications have been introduced, including deleting the requirement for monitoring high temperature of servo oil.

Sec.2 Water Jets

• Table E1: various editorial modifications have been introduced.

• Item G103, requirement for simulating load shedding through calculating torque variations, has been deleted.

Sec.3 Podded and Geared Thrusters

• Mostly editorial clarifications.

Sec.4 Compressors

• Table A1: mostly editorial clarifications.

• Item B403 has been added concerning containment for blade and or disc failure, respectively, at 110% of rated speed.

• Table E1: various editorial modifications.

• G: various modifications in torsional vibration determination have been introduced.

Pt.4 Ch.8 Electrical Installations
Main changes coming into force January 2006

• In Sec.1, Table B3 the documentation requirement for failure mode behaviour of automatic voltage regulator (AVR) has been deleted.

• In Sec.2 A204 b), the requirement for maximum transient voltage under fault conditions has been deleted.

• In Sec.5 B102, the requirement for testing of failure mode of AVR has been deleted. In Table C1, item 12 has been updated accordingly.

Pt.5 Ch.1 Ships for Navigation in Ice
Main changes coming into force January 2006

Sec.6 Winterization
This is a new section intended to meet the increasing interest in ships suitable for cold climate trading and the demand for class standards covering an overall fitness for such trading. In this connection, the existing class notations ICE-xx, DEICE and DAT(–x°C) do not cover all relevant aspects.

Comprising the requirements for the above notations and the necessary additional requirements, the following two new class notations have been introduced:

• WINTERIZED (design temp. °C)
  Rules for ships operating in cold climate

• WINTERIZED ARCTIC (design temp. °C)
  Rules for ships operating in cold climate, with additional requirements for pollution prevention in vulnerable arctic areas.

Main changes coming into force July 2006

Sec.2 Basic Ice Strengthening

• In Item C102 the CPP output has been amended from 10% to read 25%.

• Item C103 has been deleted concerning astern power and ships with steam turbines.

• Item C201 has been amended to include criteria for propeller blades, blade bolts and propeller shafts.

• In item C201 criteria concerning skewed propellers has been included.

Sec.3 Ice Strengthening for the Northern Baltic

• In item A102 a Guidance note gives reference to DNV ice classes, as being accepted as equivalent to the Finnish-Swedish ice Classes.
• In Table J2 the misprinted class notation for ICE-B and ICE-C has been corrected to read ICE-1B and ICE-1C.
• In Item J104 the formula for C µ has been designated as a minimum value.
• In item J105 a new Guidance note has been added concerning necessary further tests by FMA or SMA.
• In item J301 a designator “e” has been added concerning the distance between skew line and the generatix.
• Item J302 has been completely rewritten regarding materials for propellers and propeller parts.
• Item J303 has been completely rewritten regarding blade bending of skewed propellers.
• In item J304 the formula for “t” and fsk has been amended.
• In item J304 an new Guidance note has been added concerning the value for K1.
• Item J305 has been amended concerning the outer sections of the propeller blade-
• Item J308 has been completely rewritten to include reference to items listed in Pt.4 Ch.4 Sec.1.
• Sub-Section J400 has been renamed from “Shafting” to read “Propulsion shaft line reinforcement”. The new subsection replaces most of the original text and includes the old J500 “Thrust bearing and reduction gear”.

Sec.4 Vessels for Arctic and Ice Breaking Service

• The requirement of Charpy V notch impact testing of propellers and propeller parts at -10°C is stated in the material rules and only a reference has been left in the machinery rules. Also more specific requirements for propeller parts have been included.

• For propeller shafts, the requirement of Charpy V notch impact testing at minus 10°C is kept in the ice rules, to ensure this requirement is applied also to propeller shafts made of materials following other international standards than the DNV standard.

• A more specified evaluation of high skewed propeller blades has been included in item J403.

• Reference to 1A1 rules for flange, shrink fit and keyed connection has been introduced in item J504.

• The evaluation if intermediate shaft has been updated to correspond to changes made in the 1A1 rules for shafting (J507).

Pt.5 Ch.2 Passenger and Dry Cargo Ships
Main changes coming into force 1 April 2006

Sec.1 General Requirements

• Item A201 has been modified to cover the new class notation CSR. See Sec.5 below.

Sec.5 Dry Bulk Cargo Carriers

• This section has been modified to align with the common structural rules for bulk carriers with L ≥ 90 metres (IACS) and to cover the introduction of the related class notation CSR.

Main changes coming into force July 2006:

General
Sec.4 “General Cargo Carrier” and Sec.7 “Car Carriers” have been completely revised to align the rules with current knowledge, experience and practices.

The main changes are:

• Requirements for fatigue have been introduced.
• Text has been re-arranged for a clearer understanding.
• The relationship with Classification Note 31.2 has been established and clarified so that requirements are found in the rules, while procedures and methods on how to satisfy the rules are found in the classification note.
• Documentation requirements (for approval submittal) have been made clearer.

Pt.5 Ch.3 Oil Carriers
Main changes coming into force 1 April 2006

Main changes
Sec.2 Materials and Hull Strength

• This section has been modified to align with the common structural rules for double hull oil tankers with L ≥ 150 m (IACS) and to cover the introduction of the related class notation CSR.
  As a consequence, tankers for oil and chemicals shall comply with the Common Rules, and combination carriers shall comply with both the existing rules for dry cargo ships and the Common Rules.

Pt.5 Ch.5 Liquefied Gas Carriers
Main changes coming into force January 2006

• Sec.2 B301 has been modified. The following paragraph has been removed:
  “In case the ship is specified to comply with the special features notation, DAT, according to Pt.3 Ch.1 Sec.2 this lower temperature shall be used in the calculation.”
  This has been done since the DAT notation is applicable only to the external and exposed parts of the hull and the above requirement is additional to the DAT requirements.

• For the same reason, Sec.2 B302 has been modified. The following paragraph has been removed:
  “If, however, the builder requests the special features notation, DAT, according to Pt.3 Ch.1 Sec.2 this lower ambient air temperature will be used for the selection of outer hull materials.”

• Sec.2 C203 has been removed since the DAT requirements are covered by separate sections of the rules.

Pt.5 Ch.14 Naval and Naval Support Vessels
Main changes coming into force January 2006

• Sec.1 E102 has been modified so that the class notations indicating naval distinction have been combined and named (navdist).

• In Sec.11 I101, the class notation F-NAVAL has been re-named FIRENAV.

Main changes coming into force July 2006

• Sec.5 “Stability, Watertight and Weathertight Integrity” has been modified. The intention is to give the designer more flexibility as to the filling conditions of bilge, trim and ballast tanks in the intact stability calculations, thereby reducing the possibility of an excessively “stiff” ship design. However, more restrictive operational loading conditions may have to be observed as a consequence.

• Also, an option has been included to use reduced wind drag for stealth type vessels.

Pt.5 Ch.15 Compressed Natural Gas Carrier
Main changes coming into force July 2006

General

• The requirement that the cargo tanks shall be located in an enclosed hold space filled with nitrogen or other suitable inert gas has been removed. Instead, the cargo tanks may be located in open air. Open hold spaces will have the advantage of increased ventilation. Further, for open hold spaces special attention shall be given to corrosion protection and fire protection of the cargo tanks and the possibility for detecting a leak within the cargo area.

• The requirement for process prototype testing has been clarified.

• Minor editorial modifications have been made.

Pt.6 Ch.1 Miscellaneous Notations
Main changes coming into force July 2006

Sec.4 Diving Systems

• DSV class notation nomenclature has been changed.

• Reference has been made throughout to the new certification rules DNV-OSS-305 “Rules for Certification and Verification of Diving Systems“ with accompanying standards DNV-OS-E402 “Offshore Standard for Diving Systems“. Also, reference to other DNV Offshore codes has been included, where relevant.

• Requirements for hyperbaric evacuation systems have been deleted since they are included in DNV-OS-E402.

• Requirements for periodic surveys have also been made applicable to transferable diving systems.

• Requirements for a survey planning document have been added.

• Testing of pressure vessels has been specified in greater detail.

• Inclusion of reference to a new standard, ASME PVHO-2, gives guidance on inspection of windows.

• Survey of diving systems that are "out of commission" has now been included.

• Renewal surveys must now be carried out before the due date.
  The interval is thereby reduced in line with the interval requirements for renewal of main class and for the IMO “Diving System Safety Certificate”.

Sec.6 Additional Oil Pollution Prevention Measures – Fuel Oil Systems

• The rules for the class notation OPP-F have been updated to reflect the recent IMO proposal requiring double hull in way of oil fuel tanks.

Pt.6 Ch.19 Emergency Propulsion
The Board approved this new chapter in December 2005.

The rules come into force on January 2006.

Pt.7 Ch.1 General Requirements
Main changes coming into force January 2006

Sec.2 Classification Certificate, Periodical Surveys and Intervals

• Requirements related to annual bottom survey of passengers ships have been removed (being a statutory matter).
• Revised requirements for postponement of surveys and the term "exceptional circumstances" have been included.
• When surveys are postponed, it is no longer require to issue a CC.
• The text related to bottom survey afloat has been modified.
• Table B4 has been modified by inserting a new row covering the class notations EP-1(a%)(+), EP-2(a%)(+) and EP-3(a%)(+) introduced by the new rule chapter Pt.6 Ch.19 “Emergency propulsion”.

Main changes coming into force July 2006

Sec.2 Classification Certificate, Periodical Surveys and Intervals

• In Table B4, the text in rows covering the DSV class notation have been modified. The class notations now includes: DSV DSV-SURFACE or -BOUNCE or -SAT.

Pt.7 Ch.2 Periodical Survey requirements
Main changes coming into force January 2006

Sec.2 Survey Extent - Main Class,

• In item E101, “dedicated cement carriers” has been added to the list of ships being exempted from enhanced requirements for general dry cargo ships. This is done to align with IACS Unified Requirements 27.1.

• In item F302, a new second paragraph has been introduced covering ships that have not been assigned the class notation BIS.

Sec.3 Survey Extent - Additional Class. Special Service and Type Notations

• Sub-section element A300 “Bottom survey” has been deleted. As a consequence, annual bottom survey of passenger ships is now purely a statutory matter and the DNV rules have been harmonised with the rules of other IACS societies.

Sec.4 Survey Extent - Additional Class. Special Equipment and Systems Notations

• A new sub-section N has been inserted to cover the class notations EP-1(a%)(+), EP-2(a%)(+) and EP-3(a%)(+) introduced by the new rule chapter Pt.6 Ch.19 “Emergency Propulsion”.
  The subsequent sub-sections have been re-numbered accordingly.

Main changes coming into force July 2006

Sec.4 Survey Extent - Additional Class. Special Equipment and Systems Notations
Subsection C “Diving Systems” has been completely revised to cover class notation changes and related text changes, as well as to align with IACS Recommended Practice and Guidelines. The main changes are:

• DSV class notation nomenclature has been changed
• reference to t he new certification rules DNV-OSS-305 with accompanying standards DNV-OS-E402 has been made throughout
• reference to other DNV offshore codes are included, where relevant
• requirements for hyperbaric evacuation systems have been deleted as these requirements are included in DNV-OSE402
• requirements for periodic surveys are also made applicable to transferable diving systems
• requirements for a survey planning document have been added
• testing of pressure vessels has been specified in greater detail
• reference has been made to a new standard, ASME PVHO-2, on guidance on inspection of windows
• survey of diving systems that are "out of commission" has now been included
• renewal surveys must now be carried out before the due date. The interval has thereby been reduced in line with the interval requirements for renewal of main class and for the IMO “Diving System Safety Certificate”.

Pt.8 Ch.1 Common Structural Rules for Double Hull Oil Tankers with Length 150 metres and above
The Board approved this new chapter in December 2005.

The rules come into force on 1 April 2006.

The Rules contain two parts, one part that is for information and does not constitute specific requirements and one part giving structural rules for double hull oil tankers of 150 m or greater.

Subjects for information are given in Section 1 - Introduction and Section 2 - Rule Principles.

Specific rule requirements are given in Sections 3 to 12 and the Appendices.

Pt.8 Ch.2 Common Structural Rules for Bulk Carriers with Length 90 metres and above
The Board approved this new chapter in December 2005.

The rules come into force on 1 April 2006.

The Rules contain structural requirements for the Classification of Bulk Carriers of 90 m in length or greater

The Rules contain thirteen chapters.