1、 Guide for LNG Fuel Ready Vessels GUIDE FOR LNG FUEL READY VESSELS DECEMBER 2014 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2014 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA ii ABSGUIDE FOR LNG FUEL REA
2、DY VESSELS .2014 Foreword Foreword 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 mor
3、e widely adopted in the future. 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 ma
4、intaining the option to select 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 t
5、o note that the only international regulations currently in place for gas fueled ships, other than those covered by the IGC Code, are those included in the IMO Resolution MSC.285(86) Interim Guidelines on Safety for Natural Gas-Fuelled Engine Installations in Ships, which was adopted 1 June 2009. Th
6、ese guidelines will be replaced by the IMO International Code of Safety for Ships Using Gases or Other Low Flashpoint Fuels (IGF Code), which at the time of issuance of this Guide is expected to be in early 2017. Users of this Guide should be aware that due to changing regulations, and depending on
7、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 intent of this Guide is to provide guidance to shipowners and shipbuilders indicating the extent to which a ship design has been pr
8、epared or “ready” for using LNG as a fuel. The actual ABS requirements to be applied to gas fueled ships are detailed in the ABS Guide 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 exte
9、nt to which a vessel has been prepared or “ready” for compliance with the Gas Fueled Ships Guide. It is to be noted that compliance 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 o
10、f the Gas Fueled Ships Guide as may be applicable at the time the future conversion to a gas fueled ship is actually undertaken. Furthermore, compliance with the Gas Fueled Ships Guide requirements does not necessarily indicate compliance with the statutory requirements that may be in place at the t
11、ime of vessel conversion. Where the requirements of the Gas Fueled Ships Guide are proposed to be used to comply with IMO Resolution MSC.285(86), or the IMO IGF Code, such application is subject to approval by the flag Administration prior to issuance of the Safety Certificates on behalf of the flag
12、 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 foreseen 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
13、to the current limited bunkering infrastructure, the uncertainty of LNG price advantage worldwide, and the many technical challenges that need to be faced during the design of all the associated systems, especially in the absence of finalized International Codes and Standards. However, considering t
14、he 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 difficulties may decide to place ship orders with conventional oil fuel burning arrangement with additional provision for using LNG as a fuel w
15、ith the intention to complete installation in the future. This arrangement may be called “LNG Fuel Ready”. In order to facilitate future modifications, the shipbuyers and shipbuilders must make a significant effort to figure out what features should be incorporated on a vessel and incorporate these
16、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 must be considered and thereby assist owners, designers, and builders in taking this route. ABSGUIDE FOR LNG FUEL READY VESSELS .2014 iii
17、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 vessels. i) The first is an independent and public recognition that a vessel has been designed intentionally with feasible LNG fuel conve
18、rsion 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 the builder in terms of Class guidance and requirements. iii) The third provides confirmation to the owner and the shipbuilder that any v
19、essel 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 built as a gas fueled ship to the concept proposed. This Guide becomes effective on the first day of the month of publication. Users are ad
20、vised 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 suggestions can be sent electronically by email to rsdeagle.org. iv ABSGUIDE FOR LNG FUEL READY VESSELS .2014 Table of Contents GUIDE FOR
21、LNG FUEL READY VESSELS CONTENTS SECTION 1 General 5 1 Scope and Application 5 3 Objectives . 5 5 Recognition . 6 SECTION 2 LNG Fuel Ready Levels 7 1 Level 1 Concept 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 Plan
22、s and Data to be Submitted 8 5 Level 3 Detail Design Approval and Installation 9 5.1 Description . 9 5.3 Plans and Data to be Submitted 10 5.5 Survey . 11 ABSGUIDE FOR LNG FUEL READY VESSELS .2014 5 Section 1: General SECTION 1 General 1 Scope and Application This Guide is for optional application t
23、o ship types other than those falling under the scope of the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (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
24、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 particular gas burning concept based on existing Class requirements for gas fueled ships. The requirements for the design and construction of all fe
25、atures of systems proposed are established in the ABS Guide for Propulsion and Auxiliary Systems for Gas Fueled Ships (Gas Fueled Ships Guide). It is of course recognized that after the conversion of a vessel to LNG fueled, the arrangements and installations will still be subject to approval by the
26、flag Administrations and the flag Administration will implement the IMO requirements in effect at the time of conversion. The Interim Guidelines on Safety for Natural Gas-Fuelled Engine Installations in Ships were adopted by International Maritime Organization (IMO) Resolution MSC.285(86) on 1 June
27、2009, which invites governments to apply the Interim Guidelines to gas fueled ships other than those covered by the IGC Code. However, they will be replaced once The International Code for Safety for Ships Using Gases or Other Low Flashpoint Fuels (IGF Code) becomes effective. The IGF Code is schedu
28、led to become effective in 2017, and while it is still not finalized at IMO, it will contain a number of changes to the present requirements specified in the Interim Guidelines. This Guide is to be applied to both new construction and existing vessel conversions, regardless of size, utilizing natura
29、l 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 recognition that ABS will offer subject to compliance of the requirements at each Level. There
30、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 subsequent application of Level 2 or Level 3. These are briefly described below: Level 1 Concept D
31、esign 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 to Level 1, and it is categorized in separate groups identifying the different parts of t
32、he 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 of parts of the system and specified equipment onboard the vessel including Survey in acco
33、rdance with the related requirements of the Gas Fueled Ships Guide. Section 1 General 6 ABSGUIDE FOR LNG FUEL READY VESSELS .2014 5 Recognition Upon satisfactory completion of each review level, ABS shall provide the following recognition of the extent to which compliance with the Gas Fueled Ships G
34、uide has been established: Level 1 An Approval in Principle (AIP) for the concept design and a Record Statement will be created. Level 2 A suitably worded Statement of Compliance with the applicable Rules at the time of review with conditional information required for actual conversion. A Record Sta
35、tement will be created. Level 3 A Class Notation LNG Ready with a description note 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
36、 vessel has undergone a complete conversion to a gas fueled system that 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
37、 associated with a Gas Fueled Ship will be assigned. ABSGUIDE FOR LNG FUEL READY VESSELS .2014 7 Section 2: LNG Fuel Ready Levels SECTION 2 LNG Fuel Ready Levels 1 Level 1 Concept Design Review 1.1 Description This is a high level evaluation of the basic suitability of a particular vessel design to
38、be able to fit a particular LNG fueled ship concept design. Basic 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
39、 in compliance with the Gas Fueled Ships Guide at the time of the review. Upon satisfactory completion of this review level, ABS may provide an Approval in Principle (AIP) for this concept design and a Record Statement will be created. 1.3 Plans and Data to be Submitted The following plans and docum
40、entation shall be submitted for review: Concept Design Safety Assessment including propulsion and auxiliary arrangement requirements detailed under 2/5.1 of the Gas Fueled Ships Guide. Ship general arrangement LNG fuel storage tank type, capacity, location, and arrangement LNG fuel storage natural b
41、oil-off rate Fuel gas management plan LNG fuel bunkering station location and arrangement Fuel gas supply system arrangement Arrangement of machinery space including Gas Valve Unit Fuel Gas Handling equipment location and arrangement Preliminary hazardous areas classification plan Vent mast and vent
42、ing location and arrangement Fuel gas piping arrangement Preliminary trim and stability, longitudinal strength, and visibility study in respect to the effect of the storage tank 3 Level 2 General Design Review 3.1 Description This Level is additional to Level 1 and it is categorized in separate grou
43、ps identifying the different parts of the complete design. The level of the design details to be reviewed for each system would be general. Detailed information such as particular equipment manufacturers and installations are not required except for the gas consumers. For new construction vessels, t
44、he drawings and supporting documentation shall be reviewed for compliance with the ABS Rules for gas fueled ships having the same applicability date as the Rules applied for Classification of the vessel. Upon satisfactory completion of this review, ABS may issue a suitably-worded Statement of compli
45、ance with the applicable Rules at the time of the review with conditional information required for actual conversion. A Record Statement will be created. The reviewed drawings could then be used as part of the future conversion project pending flag State approval. Section 2 LNG Fuel Ready Levels 8 A
46、BSGUIDE FOR LNG FUEL READY VESSELS .2014 The subgroups of Level 2 are: i) Hull structural reinforcement for LNG storage tank ii) LNG fuel storage tank arrangements iii) Fuel gas bunkering system and arrangement iv) Fuel gas supply system v) Gas vapor handling system vi) Gas consumers (engines, gas t
47、urbines and auxiliaries) 3.3 Plans and Data to be Submitted The plans and documents to be submitted for each group of Level 2 are listed below. 3.3.1 Hull Structural Reinforcement for LNG Storage Tank LNG storage tank type, dimensions, and volume Tank supports, collision chocks, and anti-floatation
48、arrangements Material specifications for tank supports and steel grade selection for the hull in way of the tank Fuel gas storage tank thermal insulation 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 i
49、n way of the tank Specifications of design loads and structural analyses for the gas storage tank supports and hull reinforcement for accommodating 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
