Rules for Classification of Ships

Rule changes published in the July 2005 edition of DNV Rules for Classification will enter into force on the dates shown in the text hereunder. The main changes are as follows.

Part 3 – Hull and Equipment,
Main Class

Pt.3 Ch.1 Hull Structural Design, Ships with Length 100 metres and above
Main changes entered into force 1 July 2005

• In Sec.4 C304, the minimum sloshing pressure for double side and double bottom ballast tanks has been reduced to 12 kN/m2.

Pt.3 Ch.2 Hull Structural Design, Ships with Length less than 100 metres
Main changes entered into force 1 July 2005

• Sec.5, 6, 7 and 8 item B101 has been amended where another value for p0, in the definition list for Table B1, has been added.

Pt.3 Ch.3 Hull Equipment and Safety
Main changes entered into force 1 July 2005

• Under Sec.5, at the end of sub-section C, a new Guidance note has been added concerning the application of IACS UR A2. The UR is currently under review by IACS Hull Panel and in the meantime IMO MSC/Circ. 1175 shall be used.
• Sec.6 B400, H400 and I400 has in accordance with IACS UR S26 and S27 been amended to account for the fact that these requirements are only applicable for vessels of length greater than 80m.
• Sec.6 I402–I407 has been aligned with revision 4 of IACS UR S27 where the requirements for cargo tank venting systems and the inert gas systems are not applicable for tankers.

The following rule booklets concerning Pt.4 are common for Ships and High Speed, Light Craft and Naval Surface Craft

Part 4 – Machinery and Systems –
Main Class

Pt.4 Ch.3 Rotating Machinery, Drivers
Main changes entered into force 1 July 2005

• Sec.3 Item F206 and the related Guidance Note have been replaced to align the requirements with IACS UR M16 Rev.1 Jan 05.

Pt.4 Ch.4 Rotating Machinery, Power Transmission
Main changes entered into force 1 July 2005

• Sec.5 Item B205 has been amended providing less strict design requirements for elastic couplings for vessels with ice class notations.

Pt.4 Ch.5 Rotating Machinery, Driven Units
Main changes entering into force 1 January 2006

General

• As a consequence of the extended use of podded propulsors, the existing requirements for podded and geared thrusters have been evaluated and updated. The extended use of electro mechanical steering gear both for podded and geared azimuth thrusters has justified an update of the requirements for steering of thrusters generally and for electro mechanical steering especially. The requirements that have been added are based on equivalence to the electro hydraulic steering of conventional rudders.

Sec.3 Podded and Geared Thrusters

• A101: Scope of rules has been changed such that requirements for control system and electric system apply also to auxiliary thrusters of less than 300 kW.
• A200: More detailed requirements for documentation for steering gear and for documentation of electrical motor control system for thrusters driven by electric motor.
  Added requirements for documentation of connection stator-top housing and rotor-to-shaft for podded thrusters and for documentation of capacity of support bearing.

Requirements have been added for:

• B103: shielding of POD internals
• B104: hydraulic components (and for piping arrangement)
• B105: cooling of podded thrusters
• B202: duplication of shaft seals for single unit installations
• B203: rope guard
• B400: azimuth steering based on revised rules for conventional rudders
• B416: control system for electro mechanical steering gear with respect to acceleration and shock load
• B417: rating for electro motor driving the steering gear
• B505: bilge system for podded thrusters
• B802: separate lubrication systems for installations with a limited volume of oil sump
• E105: duplication of sensors not easily replaceable
• F104: boundary to sea
• F203: steering gear emergency power supply
• H103 and H200: survey of assembly and installation of thrusters at yard

Requirements have been updated for:

• Table E1: monitoring of thrusters
• F202: thrusters compartment
• I101–I110: sea trial testing.

Guidance note has been added covering:

• B803: lubrication oil cleanliness.

Rules for Classification of Ships (continued)

Part 5 – Special Service and Type – Additional Class

Pt.5 Ch.2 Passenger and Dry Cargo Ships

• Under Sec.8 B305, a significant misprint in the formula for bf (flange breadth) has been corrected.

Main changes entering into force 1 July 2006

• Under Sec.5, a new item E402 has been inserted concerning drainage of forward spaces to align with IACS UR M65. Existing item E402 has been re-numbered E403.

Main changes entering into force 1 January 2006

• Under Sec.6, sub-section element G300 has been amended to be in line with current practice with respect to container securing arrangements.

Pt.5 Ch.5 Liquefied Gas Carriers
Main changes entering into force 1 January 2006

Sec.3 Damage Stability and Ship Arrangements

• In C201, concerning gas dangerous spaces and cargo tanks, a Guidance note on corner radii of access through openings or manholes has been inserted to avoid high stress concentrations.
• C404, prohibiting connections between a pipe tunnel and the engine room by manholes, has been withdrawn. Item C405 has been re-numbered C404.

Sec.6 Piping Systems in Cargo Area

• The additional requirement in B205 for independent cargo tanks to be fitted with bilge drainage system from hold spaces with a capacity of at least 50% of the capacity required for cargo holds in dry cargo vessels has been deleted, in alignment with the IGC Code.

Sec.13 Instrumentation and Automation

• B312 regarding vapour contents indication and alarm has been updated to be in closer line with IACS UR F43. However, some expressions or terms from UR F43 that are not compatible with the DNV rules for gas carriers have been specified in accordance with DNV adaptation.

The main changes involve:

1. Location of sampling lines.
2. Requirements for flame arresters.
3. Requirements for bulkhead penetrations.
4. Requirements for gas detection equipment to be located in a gas tight enclosure, and alarm at gas concentrations above 30% of lower flammable limit.
5. Requirements for the enclosure above, in relation to its position.

Sec.16 Gas Operated Propulsion Machinery

• In B300, regarding arrangement of engine and boiler rooms, etc., the requirement for at least 30 air changes per hour has been withdrawn and the wording in this item has been replaced with the text from the IGC Code.

Sec.19 Personnel Protection

• In C103, a Guidance note covering locations of decontamination showers and eye wash units has been inserted.

Pt.5 Ch.7 Tugs, Supply Vessels and Other Offshore/Harbour Vessels
Main changes entered into force 1 July 2005

General
Since the class notations applicable to drilling vessels are now covered by DNV Offshore Service Specification DNV-OSS-101, Sec.6 “Drilling Vessels” of the previous issue of this chapter has been removed. The revised chapter, including other amendments previously listed in Pt.0 Ch.1 Sec.3, has therefore been reprinted, and the July 2005 issue supersedes the January 2004 issue.

Part 6 – Special Equipment and Systems – Additional Class

Pt.6 Ch.1 Miscellaneous Notations
Main changes entering into force 1 January 2006

Sec.5 Deicing and Anti-Icing Systems

• In the January 2004 rules weight distribution due to ice was changed from 300 kg/m2 to 150 kg/m2. With this change shorter vessels with lower freeboard, having more ice accumulation than larger vessels with higher freeboard, will have weight distribution due to ice determined by a new formula (B200). With this new formula, the smallest vessels with small freeboard (typically fishing vessels) will have an ice load of 300 kg/m2, while the largest vessels with large freeboard (typically LNG tankers) will have an ice load of 130 kg/m2 forward and 100 kg/m2 aft.
• Ice accrual rate is made ship-type dependent, to between 3 cm to 6 cm per day (A201).
• New sub-section elements C300 and C500 have been introduced, giving additional measures applicable to tankers for class notations DEICE and DEICE-C, respectively.

Pt.6 Ch.8 Nautical Safety
Main changes entered into force 1 July 2005

• Under Sec.4, sub-section element B1400 on installation of voyage data recorder has been deleted.

Pt.6 Ch.12 Environmental Class
Main changes entering into force 1 January 2006

Sec.1 General Requirements

• Table A1 has been amended to include propulsion machinery systems such as: gas turbines, steam turbines and combined systems.
• Table A2 has been amended to include the class notation NAUT-OSV.
• Table A3 has been replaced in its entirety.
• A new item B106 has been added concerning SOx controlled areas.
• Item B210 has been rewritten for better understanding.
• New items B213 and B214 have been added concerning NOx and SOx abatement technology, respectively.
• In item B403 the references to MARPOL have been updated.
• Item B405 has been amended to include reference to the International Convention for the Control and management of ship’s ballast water.
• Item B407 has been amended to update the IMO references concerning NOx Code.
• Item B408 has been amended to include reference to MARPOL.
• New item B409 has been added to include approval of sulphur abatement technologies.
• New item B412 has been added to include reference to IMO resolution MEPC.107(49), concerning bilge water separators.
• Table B1 has been completely revised.
• A number of changes have been made to Tables C1, C2 and C3, concerning compliance with certificates and documentation, operational procedures and plans and particulars, respectively.

Sec.2 Class Notation Clean

• Additional text has been added to item B102 concerning the fuel oil management plan.
• Concerning marine diesel engines: Items B201, B202, B203, Table B1, B204, B205, B206 have been deleted and new items B205 and B206 have been included. The rest of the sub-section element B200 has been renumbered.
• Item B401 has been completely rewritten concerning the emission criteria for refrigerants.
• Additional text has been added to item B406 concerning refrigerant leakage.
• Item B408 has been amended to include refrigerant volumes.
• Item B409 has been completely revised concerning refrigerant management processes.
• Item B502 has been amended concerning valid class notation VCS-2.
• The Guidance note in item C501 has been rewritten concerning ballast water management.
• New item C502 includes conformity with the International Convention for the Control and management of ship’s ballast water.
• Items C502 through C506 have been deleted and the remainder of the sub-section element has been renumbered.
• New item C504 introduces the additional class notations for ballast water management.
• Items C801 and C802, concerning sewage and MARPOL, have been deleted and replaced with new text.
• A new sub-section element C1000 (C1001 and C1002) has been added concerning oil and water interfaces.
• A new sub-section D, called “Other Aspects” has been added, containing:
• D100, Ship recycling
• D200, Environmental responsibilities.

Sec.3 Class Notation Clean Design

• Item B202 has been amended concerning NOx emissions and US standards. Table B1 has also been amended, accordingly.
• New item C403 includes reference to waivers applicable to supply vessels, only.
• Item C601 has been deleted and new text added concerning discharge criteria for bilge water.
• New item C603 has been added concerning the holding of a valid IOPP certificate or compliance with MARPOL.
• Item C702 has been deleted and new text added concerning the discharge of waste.
• Item D201 has been amended to include propulsion system arrangement.

Pt.6 Ch.15 Vibration Class
Main changes entered into force 1 July 2005

• Sec.2 C200 tables C3 and C4 has been amended providing somewhat less stringent requirements.

Pt.6 Ch.18 Ballast Water Management
These new rules entered into force on 1 July 2005

Introduction
The International Convention for the Control and Management of Ship’s Ballast Water and Sediments, (known as the ‘Convention’) provides regulations for Ballast Water Management, and was adopted by IMO on 13 February 2004.

The Convention will apply to ships registered in countries which have ratified the Convention, and to foreign flag ships when trading in waters coming under the jurisdiction of the countries that are party to the Convention.

It is expected that DNV will be requested to act on behalf of several flag states with respect to the Convention, and will thus prepare the rules and the supporting tools (i.e. certificates, Instructions to Surveyors and check lists) to be available as a part of a DNV service. It should be noted that if the Convention enters into force after 1 January 2009, the Convention will have retroactive effect with respect to ballast water treatment. Even though the Convention has not been ratified by a sufficient number of flag states and has not yet entered into force, there is already an increasing demand for demonstrating compliance with the Convention, since many states and ports request evidence that the ballast water has been exchanged.

Through the product introduced with this proposal; i.e. a set of class notations covering the Convention, it is believed that the customer’s expectations can be met.

Additional class notations related to the Convention
There follows a brief description of the relevant additional class notations, as related to the convention.

Vessels complying with the requirements in the Convention may be given one of the following additional class notations:

BWM-E ( ) Ballast water exchange, where a predefined letter in the bracket denotes the method for exchange that has been applied.

BWM-T Ballast water treatment. Applicable to vessels complying with the Convention by means of system(s) for treatment of ballast water complying with the Guidelines for Approval of Ballast Water Management Systems.

BWM-TP Ballast water treatment (prototype). Applicable to vessels complying with the Convention by means of system(s) for treatment of ballast water complying with the Guidelines for Approval of Prototype Ballast Water Treatment Technologies.

Part 7 – Ships in Operation

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

• Sec.6 F has been replaced to account for present changes in the Finnish and Swedish Maritime Administrations practice of approval of minimum required propulsion power based on model tests, or other means of determination of propeller net thrust.

Rules for Classification of High Speed, Light Craft and Naval Surface Craft

Part 3 – Structures, Equipment

Pt.3 Ch.7 Accommodation and Escape Measures
Main changes entering into force 1 January 2006

General
This booklet has been changed to align the rules with existing DNV policy on the inclusion of statutory regulations. In particular, the scope of work for the following cases has been more clearly defined:

• DNV being authorised by the flag state
• DNV not being authorised by the flag state
• Craft being built to national regulations.

The documentation requirements have been changed to tabular form. IMO HSC Code text has been deleted and replaced by a general reference. Appendix A has been reserved for DNV and IACS Interpretations and clarifications.

Pt.3 Ch.8 Life Saving Appliances and Arrangements
Main changes entering into force 1 January 2006

General
This booklet has been changed to align the rules with the HSC 2000 Code and to clarify DNV’s involvement and requirements concerning statutory aspects. In particular, the scope of work for the following cases has been more clearly defined:

• DNV being authorised by the flag state
• DNV not being authorised by the flag state
• Craft being built to national regulations.

The documentation requirements have been changed to tabular form. IMO HSC Code text has been deleted and replaced by a general reference. DNV and IACS Interpretations and clarifications have not yet been included, but a void Appendix A has been reserved for this purpose.

Part 5 – Special Service and Type – Additional Class

Pt.5 Ch.5 Yachts
Main changes entering into force 1 January 2006

General
Large slow going motor yachts often have displacements exceeding the basic class requirement given in Pt.1 Ch.1 Sec.2 A103, and the previous practice has been to apply the rules for ships. Due to the increasing number of enquiries for classification of large yachts, this chapter has been changed to cover these types of vessel. Also, in response to yacht owners’ requests for ice class notations (e.g. for exploration type yachts), this chapter has been amended to include ice class rules for yachts.

DNV Offshore Codes
The following Offshore Codes are new or have been amended since January 2005:

Date: 2005-10-12