1、 Guide for LNG Fuel Ready Vessels GUIDE FOR LNG FUEL READY VESSELS JANUARY 2017 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 2016 American Bureau of Shipping. All rights reserved. ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword
2、 (2017) Due to increasingly stricter environmental regulations controlling air pollution from ships, together with the potential for favorable price conditions, the use of LNG as a fuel, instead of conventional residual or distillate marine fuels, is expected to become more widely adopted in the fut
3、ure. In anticipation of this trend, the marine industry is looking for ways to provide flexibility and capability in vessel designs to enable a future conversion to an alternative fuel, such as LNG. This will provide the flexibility to limit the initial investment while maintaining the option to sel
4、ect LNG, or another low flashpoint fuel, as a fuel in the future. This arrangement may be called “LNG Fuel Ready”. The scope of such modifications can significantly differ from ship to ship and needs to be agreed between the shipowner and the shipbuilder. It is important to note that the internation
5、al regulations to be followed for gas fueled ships, other than those covered by the IGC Code, are those included in the IMO International Code of Safety for Ships Using Gases or Other Low Flashpoint Fuels (IGF Code), which entered into force on January 2017. Users of this Guide should be aware that
6、due to changing regulations, and depending on specific geographical uses, compliance with this Guide may not necessarily reflect all requirements in all regions at the time of construction or future conversion. The actual ABS requirements to be applied to gas fueled ships are detailed in the ABS Gui
7、de for Propulsion and Auxiliary Systems for Gas Fueled Ships (herein after referred to as the Gas Fueled Ships Guide). The purpose of this Guide is to indicate the extent to which a vessel has been prepared or “ready” for compliance with the Gas Fueled Ships Guide. It is to be noted that compliance
8、with the applicable edition of the Gas Fueled Ships Guide in force at the time the “LNG fuel ready” service is provided does not guarantee compliance with the edition of the Gas Fueled Ships Guide as may be applicable at the time the future conversion to a gas fueled ship is actually undertaken. Fur
9、thermore, compliance with the Gas Fueled Ships Guide requirements does not necessarily indicate compliance with the statutory requirements that may be in place at the time of vessel conversion. Where the requirements of the Gas Fueled Ships Guide are proposed to be used to comply with the IMO IGF Co
10、de, such application is subject to approval by the flag Administration prior to issuance of the Safety Certificates on behalf of the flag Administration by ABS. The applicable edition of the ABS Rules for Building and Classing Steel Vessels is to be used in association with this Guide. Despite the f
11、oreseen trend of using LNG as a fuel, the decision of building a new ship or converting an existing one to LNG fueled is not simple, due to the current limited bunkering infrastructure, the uncertainty of LNG price advantage worldwide, and the many technical challenges that need to be faced during t
12、he design of all the associated systems, especially in the absence of finalized International Codes and Standards. However, considering the promise of the advantages that may be gained from use of LNG as marine fuel at the time of the issuance of this Guide, the shipbuyers concerned with such diffic
13、ulties may decide to place ship orders with conventional oil fuel burning arrangement with additional provision for using LNG as a fuel with the intention to complete installation in the future. This arrangement may be called “LNG Fuel Ready”. In order to facilitate future modifications, the shipbuy
14、ers and shipbuilders must make a significant effort to figure out what features should be incorporated on a vessel and incorporate these in the shipbuilding contract. ABS recognizes the need for defining the “LNG Fuel Ready” scheme in the marine industry, which identifies all technical issues that m
15、ust be considered and thereby assist owners, designers, and builders in taking this route. ii ABSGUIDE FOR LNG FUEL READY VESSELS .2017 This Guide has been developed considering that the following elements may be desired by owners opting for features of LNG readiness in the Classification of their v
16、essels. i) The first is an independent and public recognition that a vessel has been designed intentionally with feasible LNG fuel conversion in mind and that it has physical features that make it suitable for such conversion. ii) The second addresses the need for owners to specify instructions to t
17、he builder in terms of Class guidance and requirements. iii) The third provides confirmation to the owner and the shipbuilder that any vessel features agreed between the two parties have been approved by the Classification society based on their Rules that would be applied if the vessel had been bui
18、lt as a gas fueled ship to the concept proposed. This Guide becomes effective on the first day of the month of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of this Guide is the most current. We welcome your feedback. Comments or su
19、ggestions can be sent electronically by email to rsdeagle.org. ABSGUIDE FOR LNG FUEL READY VESSELS .2017 iii Table of Contents GUIDE FOR LNG FUEL READY VESSELS CONTENTS SECTION 1 General 5 1 Scope and Application 5 3 Objectives . 5 5 Recognition . 5 SECTION 2 LNG Fuel Ready Levels 7 1 Level 1 Concep
20、t Design Review 7 1.1 Description . 7 1.3 Plans and Data to be Submitted 7 3 Level 2 General Design Review 7 3.1 Description . 7 3.3 Plans and Data to be Submitted 8 5 Level 3 Detail Design Approval and Installation 10 5.1 Description . 10 5.3 Plans and Data to be Submitted 10 5.5 Survey . 12 iv ABS
21、GUIDE FOR LNG FUEL READY VESSELS .2017 Section 1: General SECTION 1 General 1 Scope and Application (2017) This Guide is for optional application to ship types other than those falling under the scope of the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in B
22、ulk (IGC Code) and the ABS requirements under Part 5C, Chapter 8 of the ABS Rules for Building and Classing Steel Vessels (Steel Vessel Rules) and burning their cargo. It is applied to vessels burning conventional fuels but having design features suitable to permit conversion at a future date to a p
23、articular gas burning concept based on existing Class requirements for gas fueled ships. The requirements for the design and construction of all features of systems proposed are established in the ABS Guide for Propulsion and Auxiliary Systems for Gas Fueled Ships (Gas Fueled Ships Guide). It is rec
24、ognized that at the time of the conversion of a vessel to LNG fueled, the arrangements and installations will still be subject to approval by the flag Administrations and the flag Administration may implement the IMO requirements in effect at the time of conversion. This Guide is to be applied to bo
25、th new construction and existing vessel conversions, regardless of size, utilizing natural gas as fuel. 3 Objectives The objective of this Guide is to define a three (3) leveled “LNG Fuel Ready” scheme, to provide the details and preparations needed for each Level, and to describe the type of recogn
26、ition that ABS will offer subject to compliance of the requirements at each Level. There are three Levels considered as fundamental for defining the readiness of a vessel that is requested to be listed under the “LNG Fuel Ready” scheme. A Level 1 Concept Design Review is conducted prior to subsequen
27、t application of Level 2 or Level 3. These are briefly described below: Level 1 Concept Design Review This is a high level evaluation of the basic suitability of a particular vessel design to be able to fit a particular LNG fueled ship concept. Level 2 General Design Review This Level is additional
28、to Level 1, and it is categorized in separate groups identifying the different parts of the complete design. Level 3 Detail Design Approval and Installation This is the final Level of the “LNG Fuel Ready” scheme and incorporates both the Class Approval of the detailed drawings and the installation o
29、f parts of the system and specified equipment onboard the vessel including Survey in accordance with the related requirements of the Gas Fueled Ships Guide. 5 Recognition (2017) Upon satisfactory completion of each review level, ABS shall provide the following recognition of the extent to which comp
30、liance with the Gas Fueled Ships Guide has been established: Level 1 An Approval in Principle (AIP) for the concept design and a Record Comment of “LNG Ready Level 1” will be issued to indicate the Concept Design Review. Level 2 A Statement of Compliance with the applicable Rules at the time of revi
31、ew with conditional information required for actual conversion. A Record Comment of “LNG Ready Level 2” will be issued indicating the components or systems for which the design was reviewed. ABSGUIDE FOR LNG FUEL READY VESSELS .2017 5 Section 1 General Level 3 A Class Notation LNG Ready with descrip
32、tive letters introduced in the Record listing the parts of the system that have been installed in accordance with approved plans and to the satisfaction of the Surveyor prior to delivery of the vessel. Note: In the future once the vessel has undergone a complete conversion to a gas fueled system tha
33、t is shown to be in compliance with the Gas Fueled Ships Guide, in accordance with approved plans and to the satisfaction of the Surveyor, the above “LNG Fuel Ready” recognitions will be dropped and the appropriate Class Notations associated with a Gas Fueled Ship will be assigned. 6 ABSGUIDE FOR LN
34、G FUEL READY VESSELS .2017 Section 2: LNG Fuel Ready Levels SECTION 2 LNG Fuel Ready Levels 1 Level 1 Concept Design Review (2017) 1.1 Description This is a high level evaluation of the basic suitability of a particular vessel design to be able to fit a particular LNG fueled ship concept design. Bas
35、ic suitability would mean that the geometry and structural arrangements of the vessel can physically encompass the necessary equipment and the safety elements associated with tank location and that the hazardous areas can be accommodated in compliance with the Gas Fueled Ships Guide at the time of t
36、he review. Upon satisfactory completion of this review level, ABS may provide an Approval in Principle (AIP) for this concept design and a Record Comment of “LNG Ready Level 1” will be issued to indicate the Concept Design Review. 1.3 Plans and Data to be Submitted The following plans and documentat
37、ion shall be submitted for review: Outline Design Specification of the system and a Ship Safety Concept as referenced by 2/1.3 of the Gas Fueled Ships Guide, as deemed necessary. Ship general arrangement LNG fuel storage tank type, capacity, location, and arrangement Preliminary temperature calculat
38、ion around the LNG storage tank, as deemed necessary depending on LNG tank type and location. LNG fuel storage natural boil-off rate Fuel gas and gas vapor management plan Fuel gas supply and vapor gas handling systems location and arrangement LNG fuel bunkering station location and arrangement Conc
39、eptual arrangement of the fuel gas piping Arrangement of machinery space including Gas Valve Unit Preliminary hazardous areas classification plan Vent mast and venting location and arrangement Preliminary trim and stability, longitudinal strength, and visibility study in respect to the effect of the
40、 storage tank 3 Level 2 General Design Review 3.1 Description (2017) This Level is additional to Level 1 and it is categorized in separate groups identifying the different parts of the complete design. The level of the design details to be reviewed for each system would be general. Detailed informat
41、ion such as particular equipment manufacturers and installations are not required except for the gas consumers. For new construction vessels, the drawings and supporting documentation shall be reviewed for compliance with the ABS Rules for gas fueled ships having the same applicability date as the R
42、ules applied for Classification of the vessel. ABSGUIDE FOR LNG FUEL READY VESSELS .2017 7 Section 2 LNG Fuel Ready Levels Upon satisfactory completion of this review, ABS may issue a suitably-worded Statement of compliance with the applicable Rules at the time of the review with conditional informa
43、tion required for actual conversion. A Record Comment of “LNG Ready Level 2” including descriptive letters will be issued for the components or systems for which the design was reviewed. The reviewed drawings could then be used as part of the future conversion project pending flag State approval. Th
44、is level is not necessary for achieving LNG Ready Level 3, but it is an intermediate option for guiding the preparation of documents for the final installation of the relevant part of the system. The subgroups of Level 2 are: System/Component Descriptive Letter(s) Hull structural reinforcement for L
45、NG storage tank S LNG fuel storage tank structure TS LNG fuel storage tank arrangements TA Fuel gas bunkering system and arrangement BK Fuel gas supply system GS Gas vapor handling system BH Gas Consumers Main engines ME Auxiliary engines AE Gas turbines GT Main or Auxiliary boilers B The above desc
46、riptive letters are to supplement the “LNG Ready Level 2” Record Comment when the component or system indicated has been design reviewed (e.g., “LNG Ready Level 2 (S, TS, TA)”) 3.3 Plans and Data to be Submitted The plans and documents to be submitted for each group of Level 2 are listed below. 3.3.
47、1 Hull Structural Reinforcement for LNG Storage Tank LNG storage tank type, dimensions, and volume Tank supports, collision chocks, and anti-floatation arrangements Material specifications for tank supports and steel grade selection for the hull in way of the tank Fuel gas storage tank thermal insul
48、ation with heat transfer calculation, as referenced by 2/2.2.2iv) of the Gas Fueled Ships Guide, for confirming the steel grade selection for the hull in way of the tank Specifications of design loads and structural analyses for the gas storage tank supports and hull reinforcement for accommodating
49、the LNG storage tank together with complete stress analysis, as applicable 3.3.3 LNG Fuel Storage Tank Arrangements General arrangement of the gas storage tank(s), and as applicable, hold space/gas fuel storage room LNG storage tank supports, collision and anti-floatation arrangements Tank pressure accumulation calculation, as referenced by 2/6.1vii) of the Gas Fueled Ships Guide Tank relief valves capacity and discharge piping arrangements Ventilation and inert gas arrangement for tanks located insi
