BV NR 517: 2007压缩天然气运输船分类规则

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"这篇文档是关于船级社BV NR 517的规则说明，主要涉及压缩天然气（CNG）运输船的分类标准，发布于2007年4月。文档由 Bureau Veritas（ Bureau Veritas 船级社）提供，详细规定了各类船舶，包括但不限于海上或内陆水域的船只、结构、系统或其部分，如潜艇、气垫船、钻井平台、海底安装设施等的分类标准。此外，还提到了相关辅助设备如井口、管道和系泊设施等的分类规定。Bureau Veritas 船级社负责制定分类规则、指导性注解和其他文件，并根据其介入情况出具证书、证明和报告。" 正文： Bureau Veritas（BV）是一家致力于船舶分类的社会组织，其海洋部门（"Society"）的工作重点是对各种类型的船舶、结构或其中的系统及其部分进行分类，这些统称为"单元"，无论它们是否与陆地、河床或海床相连，不论是在海上还是内陆水域，包括但不限于潜艇、气垫船、钻井平台、各种用途的海上设施，以及与其相关的附属设备，如海底设施、井口和管道等。文档"BV NR 517"是关于压缩天然气运输船分类的一个规则注解，发布于2007年4月。该规则详细阐述了CNG运输船的设计、建造和运营必须遵循的标准，以确保安全性和合规性。这些标准不仅涵盖了船舶的基本构造，还涉及了与运输压缩天然气相关的特殊安全措施，因为CNG是一种高压力、易燃的气体，对运输和储存条件有严格要求。 Bureau Veritas 船级社的责任包括制定分类规则、指导性注解以及其他相关文件。这些规则旨在提供一套清晰的指导方针，帮助船舶设计师、制造商、运营商和监管机构理解并遵循。在完成相应的评估和检查后，船级社还会出具证书、证明和报告，这些文件对于船舶的保险、注册和国际航行都是至关重要的。 CNG运输船的分类考虑因素可能包括但不限于船体结构强度、气体处理和储存系统的安全性、操作流程、紧急响应计划以及人员培训。这些标准通常会随着技术进步和行业最佳实践的发展而更新，以确保行业的持续安全和效率。通过遵循 BV NR 517 规则，CNG 运输船可以确保符合国际海事组织（IMO）和其他相关国际法规的要求，同时也有助于提高船舶的可靠性和市场接受度。对于船东和运营商而言，了解并遵守这些规则是确保业务顺利运行的关键，对于船级社而言，制定和执行这些规则则是保障海上安全和环境的重要职责。

April 2007 Bureau Veritas

NR 517

1.7.1. Accommodation spaces are those spaces used for public spaces, corridors,

lavatories, cabins, offices, hospitals, cinemas, games and hobbies rooms, barber shops,

pantries containing no cooking appliances and similar spaces. Public spaces are those

portions of the accommodation which are used for halls, dining rooms, lounges and similar

permanently enclosed spaces.

1.7.2. `A’ class divisions means divisions as defined in SOLAS regulation II-2/3.2.

1.7.3.1. Administration means the Government of the State whose flag the ship is entitled to

fly.

1.7.3.2. Port Administration means the appropriate authority of the country in the port of

which the ship is loading or unloading.

1.7.3.3. N/A

1.7.4. Boiling point is the temperature at which a product exhibits a vapour pressure equal to

the atmospheric pressure.

1.7.5. Breadth (B) means the maximum breadth of the ship, measured amidships to the

moulded line of the frame in a ship with a metal shell and to the outer surface of the hull in a

ship with a shell of any other material. The breadth (B) is to be measured in metres.

1.7.6. Cargo area is that part of the ship which contains the cargo containment system and

cargo pump and compressor rooms and includes deck areas over the full length and breadth

of the part of the ship over the above-mentioned spaces. Where fitted, the cofferdams,

ballast or void spaces at the after end of the aftermost hold space or at the forward end of

the forwardmost hold space are excluded from the cargo area.

1.7.7. Cargo containment system is the arrangement for containment of cargo including,

where fitted, associated insulation and any intervening spaces, and adjacent structure if

necessary for the support of these elements.

1.7.8. Cargo control room is a space used in the control of cargo handling operations and

complying with the requirements of 3.4.

1.7.9. Cargoes are products carried in bulk by ships subject to this Rule Note.

1.7.10. Cargo service spaces are spaces within the cargo area used for workshops, lockers

and store-rooms of more than 2 m

in area, used for cargo handling equipment.

1.7.11. Cargo tank is the Gas-tight shell or shells connected together in assemblies

designed to be the primary container of the cargo and includes all such containers whether

or not associated with insulation or secondary barriers or both up to the first stop valve.

1.7.12. Cofferdam is the isolating space between two adjacent steel bulkheads or decks.

This space may be a void space or a ballast space.

April 2007 Bureau Veritas

NR 517

1.7.13. Control stations are those spaces in which ships’ radio or main navigating equipment

or the emergency source of power is located or where the fire-recording or fire-control

equipment is centralized. This does not include special fire-control equipment which can be

most practically located in the cargo area.

1.7.14. Flammable products are the various types of natural gases.

1.7.15. Flammability limits are the conditions defining the state of fuel-oxidant mixture at

which application of an adequately strong external ignition source is only just capable of

producing flammability in a given test apparatus.

1.7.16. CNG carrier is a cargo ship constructed or adapted and used for the carriage in bulk

of compressed natural gas.

1.7.17. Gas-dangerous space or zone is:

.1. a space in the cargo area which is not arranged or equipped in an approved

manner to ensure that its atmosphere is at all times maintained in a gas-safe condition;

.2. an enclosed space outside the cargo area through which any piping containing

condensate or gaseous products passes, or within which such piping terminates,

unless approved arrangements are installed to prevent any escape of product vapour

into the atmosphere of that space;

.3. a cargo containment system and cargo piping;

.4. a hold space where cargo is carried

.5. a space separated from a hold space described in 4 by a single gastight steel

boundary;

.6. a cargo handling equipment room;

.7. a zone on the open deck, or semi-enclosed space on the open deck, within 3 m of

any cargo tank outlet, gas or vapour outlet, cargo pipe flange or cargo valve or of

entrances and ventilation openings to cargo handling equipment rooms;

.8. the open deck over the cargo area and 3 m forward and aft of the cargo area on the

open deck up to a height of 2.4 m above the weather deck;

.9. a zone within 2.4 m of the outer surface of a cargo containment system where such

surface is exposed to the weather;

.10. an enclosed or semi-enclosed space in which pipes containing products are

located. A space which contains gas detection equipment complying with 13.6.5 and a

space utilizing cargo gas as fuel and complying with chapter 16 are not considered

gas-dangerous spaces in this context;

.11. a compartment for cargo hoses; or

April 2007 Bureau Veritas

NR 517

.12. an enclosed or semi-enclosed space having a direct opening into any gas-

dangerous space or zone.

1.7.18. Gas-safe space is a space other than a gas-dangerous space.

1.7.19. Hold space is the space enclosed by the ship’s structure in which a cargo

containment system is situated.

1.7.20. Independent means that a piping or venting system, for example, is in no way

connected to another system and there are no provisions available for the potential

connection to other systems.

1.7.21. Insulation space is the space occupied wholly or in part by insulation.

1.7 22. N/A

1.7.23. Length (L) means 96% of the total length on a waterline at 85% of the least moulded

depth measured from the top of the keel, or the length from the foreside of the stem to the

axis of the rudder stock on that waterline, if that be greater. In ships designed with a rake of

keel, the waterline on which this length is measured are to be parallel to the designed

waterline. The length (L) are to be measured in metres.

1.7.24. Machinery spaces of category A are those spaces and trunks to such spaces which

contain:

.1. internal combustion machinery used for main propulsion; or

.2. internal combustion machinery used for purposes other than main propulsion where

such machinery has in the aggregate a total power output of not less than 375 kW; or

.3. any oil-fired boiler or oil fuel unit.

1.7.25. Machinery spaces are all machinery spaces of category A and all other spaces

containing propelling machinery, boilers, oil fuel units, steam and internal combustion

engines, generators and major electrical machinery, oil filling stations, refrigerating,

stabilizing, ventilation and air-conditioning machinery, and similar spaces; and trunks to such

spaces.

1.7.26. MARVS is the maximum allowable relief valve setting of a cargo tank.

1.7.27. Oil fuel unit is the equipment used for the preparation of oil fuel for delivery to an oil-

fired boiler, or equipment used for the preparation for delivery of heated oil to an internal

combustion engine, and includes any oil pressure pumps, filters and heaters dealing with oil

at a pressure of more than 1.8 bar gauge.

1.7.28. Organization is the International Maritime Organization (IMO).

1.7.29. Permeability of a space means the ratio of the volume within that space which is

assumed to be occupied by water to the total volume of that space.

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