Rules for Classification Rule changes published in the January 2005 edition of DNV Rules for Classification will enter into force on 1 July 2005, unless otherwise stated. For more information, please contact Mike Dyer at +47 67 57 86 44 or Mike.Dyer@dnv.com. Alternatively, information can be obtained by sending an email to rules@dnv.com.

The main changes are as follows:

Special Service and Type - Additional Class
CNG CARRIERS SCANTLING AND TESTING OF COMPOSITE TYPE CARGO TANKS
Applicable Rules:
Rules for Classification of Ships
Pt.5 Ch.15

To remain market leaders and in response to customer request for lighter containment systems, the changes in these rules include a set of new requirements which addresses the use of composites as cargo containment systems, onboard CNG carriers. These additional requirements have led to stricter requirements in Fire Protection and Extinction, which has been addressed in a HAZOP programme.
Hull and Equipment, Main Class

Special Service and Type - Additional Class
FOUNDATIONS FOR DECK MACHINERY, TOWING EQUIPMENT AND LIFTING APPLIANCES
Applicable Rules:
Rules for Classification of Ships
Pt3 Ch1 Sec8, Pt3 Ch2 Sec7, Pt3 Ch3 Sec5, Pt5 Ch3 Sec1, Pt5 Ch4 Sec1, Pt5 Ch4 Sec2,
Pt5 Ch5 Sec1, Pt5 Ch5 Sec2.
(IACS UR A2)

A general revision of Pt.3 Ch.3 Sec.5 was undertaken, which includes updating in accordance with IACS UR A2. Additionally, Pt.3 Ch.1 Sec.8 E500 and Pt.3 Ch.2 Sec.7 E400 were deleted, and merged into Pt.3 Ch.3 Sec.5,
The requirements for the arrangement of emergency towing for tankers, which was previously found in Pt.3 Ch.1 Sec.8 E600, has been moved to Pt.5 Ch.3 Sec.2 (Oil Carriers) with appropriate cross references in Pt.3 Ch.3 Sec.5 C, Pt.5 Ch. 4 (Chemical Carriers) and Pt.5 Ch.5 (Gas carriers).

General Regulations
Special Equipment and Systems - Additional Class
Ships in Operation
SAFETY OF NAVIGATION FOR NAVAL VESSELS
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt. 6 Ch. 17 (new), Pt. 1 Ch. 1, Pt. 7 Ch. 1, Pt. 7 Ch. 2
These new rules introduce a set of requirements and guidelines in compliance with the principles and aims of SOLAS Amendments 2000 Ch. V and the 2000 HSC Code Ch. 13 and 15, and which highlight the aims of SOLAS Ch. V Reg. 15.

Materials and Welding
STEEL PIPES
Applicable Rules:
Rules for Classification of Ships
Pt.2 Ch.2 Sec.4
These new rules are risk based, i.e. they have been established on the basis of a simplified formal safety assessment (FSA). The FSA results indicated that design, high pressure and corrosion are the major influencing factors regarding failures and, hence, accident costs.

Special Service and Type - Additional Class
CLASS NOTATION ICEBREAKER AND POLAR -
STABILITY REQUIREMENTS
Applicable Rules:
Rules for Classification of Ships
Pt.5 Ch.1 Sec.4 L
The IMO MSC/Circ 1056 "Guidelines for Ships Operating in Arctic Ice-covered waters", agreed in 2002, includes requirements covering intact and damage stability for ships operating in ice condition.
The intention has been to replace the current intact and damage stability requirements in DNV rules, relevant for the class notations Icebreaker and Polar with those of the IMO guidelines relevant for polar classes 1 to 3.

General Regulations
Special Service and Type - Additional Class
Ships in Operation
CARRIAGE OF REFRIGERATED CONTAINERS
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.1 Ch.1 Sec.2, Pt.5 Ch.2 Sec.10, Pt.7 Ch.1 Sec,. Pt.7 Ch.2 Sec.4
New Reefer container Class Notations have been included in the rules, as follows:
RC-1 vessels for carriage of refrigerated container containing mainly chilled cargo
RC-2 vessels for carriage of refrigerated containers containing both frozen and chilled cargo
RC-3 vessels for carriage of refrigerated containers containing mainly deep frozen cargoes
(X/Y) meaning that the vessel may carry X reefer containers on deck and Y in the holds.

Machinery and Systems - Main Class
STEERING GEAR
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.4 Ch.14 (New)

The machinery component of the steering gear rules have been amended and moved; from the Rules for Classification of Ships Pt.3 Ch.3, and the Rules for High Speed Light Craft and Naval Surface Craft Pt.3 Ch.5; to a new Ch.14 in Pt.4.

Hull and Equipment - Main Class
STERNFRAMES, RUDDERS AND STEERING GEARS
Applicable Rules: Enters into force 1st January 2005
Rules for Classification of Ships
Pt.3 Ch.3 Sec.2

The rules for steering gear have been moved from Pt.3 Ch.3 Sec.2 to Pt.4 Ch.14. Changes to Pt.3 Ch.3 Sec.2 E303 (Solepiece). The reason for changing the requirement from Z/3 to Z/2 in the 1991 edition of the rules is not clear.. The minimum requirement in the Rules today is assumed to be too conservative, and the Rules have been changed back to the requirement of the 1989 edition of the rules.

Structures, Equipment
EQUIPMENT, STEERING AND APPENDAGES
Applicable Rules:
Rules for Classification High Speed Light Craft and Naval Surface Craft
Pt.3 Ch.5

The changes to the Rules for Classification of High Speed Light Craft and Naval Surface Craft Pt.3 Ch.5, amend the machinery component of the steering gear rules. These amendments have been included in a new, common rule booklet, Chapter 14, called "Steering Gear", in Part 4 of the Machinery and Systems, Main Class rules.

Special Equipment and Systems - Additional Class
GAS FUELLED ENGINE INSTALLATIONS
Applicable Rules:
Rules for Classification of Ships
Pt.6 Ch.13
(IACS UR M59)

Pt.6 Ch.13 has been amended in order to implement the following IACS requirements:

• strength analysis shall be carried out, to confirm sufficient constructive strength of high pressure gas piping systems
• all valves and expansion joints used in high pressure gas systems shall be of an approved type
• If a duct contains high pressure gas pipes, the ventilation inlet shall be provided with a non-return device. However, if a gas detector is fitted at the air intake, this requirement can be dispensed with.
• Automatic purging of the pipe between the master gas valve and the engine, when the inner pipe contains high pressure gas.
• The class notation GAS FUELLED is made mandatory for ships with installations of gas fuelled engines.

Special Service and Type - Additional Class
APPLICATION OF BULK CARRIER NOTATION
Applicable Rules:
Rules for Classification of Ships
Pt.5 Ch.2 Sec.5
SOLAS (Ch. XII)

In the January 2003 rules there was an opening for giving the Bulk Carrier notation to vessels with structural arrangement other than the typical bulk carrier cross section (i.e. without hopper tanks and top-wing tanks). In 2002 this possibility was removed. In 2005 the rules concerning vessel primarily intended for the carriage of solid bulk cargoes, have been introduced so as to be in line with SOLAS (Ch. XII).

Machinery and Systems - Main Class
STEAM TURBINES
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.4 Ch.3 Sec.3
Pt.4 Ch.3 Sec.3 has been updated, the main changes cover; documentation requirements, hydraulic testing, single turbine operation, starting interlocks and general editorial changes.

Special Service and Type - Additional Class
NAVAL AND NAVAL SUPPORT VESSELS
MACHINERY, PROPULSION AND POSITIONING
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.5 Ch.14 Sec.7

The main changes to these rules are as follow:

• The text has been simplified and requirements that are already listed in Pt.4 have been deleted.
• Requirements for specific components such as diesel engines, gas turbines and water jet units have been removed, as they are already listed in Part 4.
• Requirements for "shock loads" have been clarified, and extended.
• The requirements for propulsion system arrangement and redundancy have been revised, and the requirements for different systems have been made more consistent.
• The revised text opens up for alternative machinery space arrangements.
• A number of requirements that are considered "owner's requirements" have been removed.

Special Equipment and Systems - Additional Class
LOADING COMPUTER SYSTEMS (LCS)
FOR STABILITY AND LONGITUDINAL STRENGTH
Applicable Rules:
Rules for Classification of Ships
Pt.6 Ch.9, Pt.7 Ch.2

IACS UR L5
The new IACS UR L5 enters into force as from July 2005. The main change compared with the existing rules is that when a loading computer software is installed it must cover all stability requirements relevant to that ship, i.e. if installed on a "Tanker for Oil" the software must be able to check both intact stability and damage stability according to MARPOL.

General Regulations
Special Equipment and Systems - Additional Class
Ships in Operation
HULL MONITORING SYSTEM
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.1 Ch.1, Pt.6 Ch.11, Pt.7 Ch.2

The scope of these new rules is to make the hull monitoring system more useful as an operational tool and as a data base for maintenance planning. Additional requirements with respect to onboard data analyses and displaying the data have been introduced. New requirements with respect to storing and exporting of data have been added.

Machinery and Systems - Main Class
ELECTRICAL INSTALLATIONS
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.4 Ch.8 Sec.1 to Sec.13
Offshore Codes
OS-D201

IACS UR E15, EC directive 1997/70/EC, IEC 60092-353, IEC 60092-354, IEC 60092-376, IEC 60332-3.

The scope of these rule changes has been to update a number of paragraphs in accordance with most recent IEC and IACS requirements, add some new requirements based on experience feedback, and to update references as well as to correct some misprints.

Materials and Welding
Hull and Equipment - Main Class
Special Service and Type - Additional Class
FABRICATION AND TESTING OF SHIP STRUCTURES
Applicable Rules:Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.2 Ch.3, Pt.3 Ch.1, Pt.3 Ch.2, Pt.3 Ch.3, Pt.5 Ch.4, Pt.5 Ch.5
This new rule booklet is an upgrading of the present rules for fabrication. The following main goals are focused:
Collect all DNV requirements to fabrication in one Section (Pt.2 Ch.3) of the rules;
Update the present requirements so as to harmonise them with other international standards for welding, assembly and testing of steel structures;
Provide a rule structure suited for optimising quantitative requirements based on FSA.

Hull and Equipment - Main Class
Special Service and Type - Additional Class
BOW DOORS, SIDE SHELL DOORS AND STERN DOORS
Applicable Rules:
Rules for Classification of Ships
Pt.3 Ch.3 Sec.6, Pt.5 Ch.2 Sec.3

IACS UR S8 and IACS UR S9
The main changes are related to:

• the operating and maintenance manual (scope of approval and list of required content),
• the bow door areas for calculation of design forces (updated definitions), and
• the system for operation, indication and monitoring of bow-, side shell- and stern doors.

Ships in Operation
HULL SURVEYS OF BULK CARRIERS
Applicable Rules: Enters into force 1st January 2005
Rules for Classification of Ships
Pt.7 Ch.2 Sec.3

(IACS UR S10.5)
The main changes:

• In F500, additional requirements for single side skin bulk carriers - transverse bulkheads, some minor corrections have been proposed in order to align present proposal with IACS UR Z10.2.
• In F600, additional survey requirements for the foremost cargo hold of bulk carriers subject to SOLAS XII/9.1, some minor changes for clarification purposes have been proposed.

Ships in Operation
THRUSTERS FOR PROPULSION AND DYNAMIC POSITIONING
Applicable Rules:
Rules for Classification of Ships
Pt.7 Ch.1 and Ch.2

The classification systematics related to surveys of thrusters for propulsion and dynamic positioning has not been consistent with other periodical surveys. The forthcoming new release of Nauticus Production System (NPS) has accentuated the need for revision. This rule update shows that the survey may be carried out with a reduced scope at alternate surveys, or if the total number of running hours is less than 15000 since the last survey with full scope.

Machinery and Systems - Main Class
ROTATING MACHINERY, POWER TRANSMISSION
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.4 Ch.4
The main changes are:
Sec.1:

• Minimum KA factor to be used in shaft calculations introduced in order to cover normal load fluctuations.
• 2KAT0 is replaced with 2Tpeak
• Coefficient of friction for the most relevant combinations of materials for frictional connections are collected and presented in table B6.
• Requirement for surface crack detection of shaft coupling shrinkage surfaces is waived.
• Electrical grounding is mandatory for all propeller shafts, not only for TMON.
  

Sec.2:

• Lower minimum safety for NAVAL class vessel is limited to small navy vessels, i.e. NAVAL+ LC
• Requirement for material certification of cast gear casings is deleted and new footnote regarding product certification requirements for in-house production of parts (pinion and wheels and clutches).
• Clarification of monitoring requirements

Machinery and Systems - Main Class
CONTROL AND MONITORING SYSTEMS
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.4 Ch.9
SOLAS II-1/31.2.10 and SOLAS II-1/37
The main changes are

• Requirements for work stations clarified.
• Definition of essential and important systems aligned with Pt.4 Ch.8.
• Minor changes in documentation requirements.

Hull and Equipment - Main Class
INTERNAL COMMUNICATION
Applicable Rules:
Rules for Classification of Ships
Pt.3 Ch.3 Sec 12
The Internal Communication rules for cargo and passenger ships, have been amended as follows:

• Updating the existing text giving clearer requirements.
• Include references to international standards regarding functionality of GA and PA.
• Updating the electrical requirements for Internal Communication systems as per Pt.4 Ch.8.
• Introducing design requirement for PA and GA.
• Update the requirements for additional class.
• Generally, include the SOLAS Intercom requirements.

Special Service and Type - Additional Class
ELECTRIC POWER GENERATION AND TRANSFER
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.5 Ch.14
The main changes in the text are:

• Requirements already covered by Pt.4 Ch.8 have been removed.
• Requirements for emergency power revised and clarified.
• Stricter requirements for separation of the main sources of power introduced.
• Requirements for casualty power distribution system introduced.

Hull and Equipment - Main Class
MINIMUM BOW HEIGHT AND RESERVE BUOYANCY
Applicable Rules:
Rules for Classification of Ships
Pt.3 Ch.1 Sec.3 A900
Pt.3 Ch.2 Sec.3 A900

Regulation 39 of the International Convention on Load Lines.
In the amendments to annex B to the protocol of 1988 relating to the International Convention on Load Lines (1966), valid for vessels with keel laid 2005-01-01 or later, the content of Reg.39 has been altered, and a revision of DNV Ship Rules Pt.3 Ch.1 Sec.3 A900 and Pt.3 Ch.2 Sec.3 A900 has been affected.

The alterations of Reg. 39 consist of:
1 a new formula for calculating the minimum required freeboard
2 the content of IACS UI LL38 and LL43 has been integrated into Reg.39
3 a new requirement for minimum reserve buoyancy in the foreship included in Reg.39 (5).

Special Service and Type - Additional Class
FIRE SAFETY (Naval Craft)
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.5 Ch.14 Sec.10
The main changes introduced are:

• updating of references to SOLAS Reg. II
• including text that has been taken out of SOLAS Reg. II.
• some changes and clarification based on our experience from the use of the rules on Naval Craft projects.

Special Service and Type - Additional Class
NAVAL AND NAVAL SUPPORT VESSELS - PIPING SYSTEMS
Applicable Rules:
Rules for Classification of Ships and High Speed Light Craft and Naval Surface Craft
Pt.5 Ch.14 Sec.10
The main changes to the text are:

• Clarifications of requirements
• Deleting requirements that are considered to be "Owners requirements"
• Requirements to small naval vessels have been added as reviewed and approved by the Design Review Board. Ref. RP-06-03 Small Naval Vessels that was withdrawn and decided merged with Pt.5 Ch.14

Offshore Codes
DNV-OSS-309 (New)
Enters into force April 2005
VERIFICATION, CERTIFICATION AND CLASSIFICATION
OF GAS EXPORT AND RECEIVING TERMINALS