DNV DNVGL-RU-SHIPS PART 6 CHAPTER 4 [ Revised ]

• The scope for additional class notations Bow loading and STL (submerged turret loading system) shall add a level of safety to the arrangements utilised for the transfer of crude oil from offshore loading terminals to the ship. Ship manoeuvrability and positioning, special piping arrangements, strong points for mooring and consideration of hazardous areas are included in the design for this notation.

• The scope for additional class notation CCO adds a level of safety related to centralised operation and surveillance of cargo and ballast systems. The arrangement and design include piping requirements, much in line with DNV GL piping rules, monitoring and remote control systems, and an information system that will enable the operation to easily retrieve and display all data needed for observing limitations and operational requirements.

• The scope for additional class notation EL defines the requirements for loading sequences; this includes: minimum rule-defined loading and de-ballasting rates, piping systems and strength requirements. Loading and unloading sequences shall be synchronized with the de-ballasting operation, and for water ballast and fuel oil storage, a remote sounding system is required interfaced into the on-board loading computer.

• The scope for additional class notation ETC defines requirements for arrangements for efficient cleaning of tanks when changing from dirty to clean oil cargoes.

• The scope for additional class notation MCDK sets requirements for ships arranged with movable car decks or deck pontoons. Design loads include load and strength requirements for supports and suspensions, wheel loading, strength of moveable and pontoon car decks. Additionally, stowing arrangements for all moveable deck pontoons and drainage have been included.

• The scope for additional class notation LCS concerns an on-board computer system running a combination of software modules for stability and strength verification. The term loading computer systems applied in these rules also covers the terms loading instruments and on-board stability computers. These rules do not cover basic (system) software such as device drivers necessary for the hardware to support the application software. The qualifier DC added to the notation (i.e. LCS(DC)) concerns damage control software developed to assist the master as a decision aid, receiving input from flooding and filling detectors installed in the vessel's compartments.

• The scope of this section covers requirements for the design, construction and testing of regasification plants.

• The scope for additional class notation RCP concerns the carriage of a designated number of refrigerated containers related to refrigerated 40' containers (R-FEU's). Any special conditions or operational restrictions related to container size, stowage positions, access or availability of electric power will be stipulated in the appendix to the classification certificate. The rules in this section do not cover any installations fitted in individual containers. The builders and possible subcontractors' specifications of the ships operational performances and abilities are additional requirements beyond the scope of class. Design arrangement and control of container ventilation and hold temperature are considered critical to the carriage of these types of container, and as such electrical installations with sufficient capacity for ventilation and cooling arrangements shall be in accordance with Pt.4 Ch.8 and be classed as important services.

• The scope for additional class notation RM concerns ships that are especially designed, arranged and equipped for the carriage of dry cargo, and with an additional capacity for carrying refrigerated cargoes. Fishing vessels with a refrigerating plant are also included in this notation. Design operating conditions and specifications will be stipulated in the appendix to the classification certificate. The builders' and possible subcontractors' specifications of the ship's operational performances and abilities shall, together with the specific requirements of this section, be used as basis for assignment of class.

• The scope for additional class notation RSCS+ provides requirements for load assumptions for lashing calculations, applicable to ships with route specific reductions in transverse design. The applicable predefined or individual routes, as well as route tolerances are described in this section. A customer may specify individual routes based on a sequence of port calls or waypoints applied in the respective RSCS+ application available on. Containers are stowed on-board the ship in accordance with an approved route specific addendum to the container securing arrangement plan. The route description shall not hazard safe navigation, which means that adverse weather conditions should be avoided as far as possible.

• The scope for additional class notation VCS provides requirements for the control of vapour emissions from liquid cargoes. The components that make up the scope for this notation include: vapour collection piping systems; each chemical-, product- or crude carrier shall have vapour collection piping system that is permanently installed, closed gauging arrangement, tank level and vapour pressure alarms, and verification of the capacity of the vapour collection system, including pressure drop calculations.

• The scope for additional notation CA concerns ships that are specially designed, arranged, and equipped for operation with controlled atmosphere.

The scope for additional notation CA(port.) concerns ships for which the use of a portable nitrogen generating and possibly instrumentation unit has been foreseen for operation with controlled atmosphere.

• The additional class notation ITC set requirements for arrangements and systems for improved tank cleaning of large oil tankers when changing from dirty to clean oil cargoes.

• These rules give requirements for systems and equipment related to the storage and regasification of liquefied gases.