1、 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 1 GUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS JULY 2008 NOTICE NO. 1 May 2010 The following Changes become EFFECTIVE AS OF 1 MAY 2010. (See http:/www.eagle.org for the consolidated version of the Guide for Building and Classin
2、g Mobile Offshore Units 2008, with all Notices and Corrigenda incorporated.) Notes - The date in the parentheses means the date that the Rule becomes effective for new construction based on the contract date for construction. (See 1-1-4/3.3 of the ABS Rules for Conditions of Classification Offshore
3、Units and Structures (Part 1).) FOREWORD (Revise Foreword, as follows.) Foreword (1 May 2010) This Guide specifies the ABS requirements for building and classing Mobile Offshore Units of self-elevating or column-stabilized type, not fitted with drilling equipment, production facilities, hydrocarbon
4、storage, or any other system onboard handling hydrocarbons. Examples of Mobile Offshore Units covered by this Guide are: Accommodation Units Crane Units Construction and Maintenance Units Drilling Tenders Pipe and Cable Laying Units Wind Turbine Installation, Maintenance and Repair Units and similar
5、 units used by the offshore industry. The requirements contained in this Guide are for design, construction, and survey after construction of the Mobile Offshore Unit (including hull structure, equipment and marine machinery) and are based on the ABS Rules for Building and Classing Mobile Offshore D
6、rilling Units (MODU Rules). Reference tables are provided to identify the requirements in the MODU Rules applicable to the Mobile Offshore Units. Notice No. 1 May 2010 2 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 CHAPTER 1 SCOPE AND CONDITIONS OF CLASSIFICATION SECTION 2 CLASSIFI
7、CATION SYMBOLS AND NOTATIONS 1 Units Built Under Survey (Add new Paragraph 1-2/1.5, as follows.) 1.5 Specific Unit Types (1 May 2010) Notations for specific types of units are given in the relevant Sections of Chapter 7. (Add new Section 7-6, as follows.) CHAPTER 7 SPECIFIC UNIT TYPES SECTION 6 WIND
8、 TURBINE INSTALLATION, MAINTENANCE, AND REPAIR UNITS (1 May 2010) 1 General Wind Turbine Installation, Maintenance and Repair units, as defined in 7-6/3.1, built to the requirements of this Section and other relevant sections of this Guide may be assigned the notation of Wind IMR after the classific
9、ation notations described in 1-2/1. 3 Definitions For the purpose of these requirements, the terms have the following meaning unless stated otherwise. 3.1 Wind Turbine IMR Unit Within the application of this Guide, a Wind Turbine IMR Unit is a mobile offshore unit primarily intended for the installa
10、tion, maintenance, and repair of wind turbines, including pile driving, tower installation, and nacelle and blade installation. 3.3 Deck Cargo Deck Cargo includes wind turbine nacelles, towers, blades, and any other items which are installed in association with a wind power generation structure. It
11、also includes any temporary structures such as racks, stands, or cradles which are not permanently attached to the unit. 5 Certification of Cranes Any crane permanently installed on board the Wind Turbine IMR unit and intended for operations other than supply of provisions and maintenance of the uni
12、t is to be certified by ABS in accordance with Chapter 2 of the ABS Guide for Certification of Lifting Appliances or API Specification 2C. Notice No. 1 May 2010 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 3 Mobile cranes not permanently attached to the unit structure, such as craw
13、ler cranes, are not required to be certified. Lifting appliances of types not considered in the above referenced standards will be subject to special consideration. 7 Crane Pedestal and Supporting Structure The crane pedestal, when not covered by the crane certification, is to be designed in accorda
14、nce with the recognized standard to which the crane is certified. Details and calculations are to be submitted for review. In addition, crane pedestals are to be designed to resist motion-induced loads in severe storm, normal operating and transit conditions using the allowable stresses defined in 3
15、-2-1/3 of the MODU Rules, considering the operating limits of the crane. Detail drawings of the foundation and supporting structure on which the crane and boom rest or other stowage arrangements are installed are to be submitted for review. The hull supporting structure is also to be designed to res
16、ist the design static and dynamic loading conditions of the crane, using the allowable stresses defined in 3-2-1/3 of the MODU Rules. The boom rest or other stowage arrangements and their foundation and supporting structure are to be designed for the out-of-service loads as defined in 2-2/5.1.2 of t
17、he ABS Guide for Certification of Lifting Appliances or the recognized standard to which the crane is certified. 9 Supporting Structure for Pile Driving Equipment Detail drawings of the foundation and supporting structure on which the pile driving rig and supporting equipment are installed are to be
18、 submitted for review. The hull supporting structure is also to be designed to resist the design static and dynamic loading conditions of the pile driving equipment using the allowable stresses defined in 3-2-1/3 of the MODU Rules. In addition, the foundation and supporting structure are to be desig
19、ned to resist motion-induced loads in severe storm, normal operating and transit conditions using the allowable stresses defined in 3-2-1/3 of the MODU Rules. 11 Supporting Structure for Deck Cargo Foundations and supporting structure in way of deck cargo and permanently attached cargo-carrying stru
20、ctures such as blade racks are to be designed to adequately resist the load effects of the cargo in severe storm, normal operating and transit conditions using the allowable stresses defined in 3-2-1/3 of the MODU Rules. Consideration is also to be given to the Wind Turbine IMR unit in damaged condi
21、tions, where the structures above are to withstand the load effects of the cargo caused by the trim and heel of the unit in these damaged conditions, using the allowable stresses defined in 3-2-1/3 of the MODU Rules in association with a factor of safety of 1.0. Tie-down or other securing arrangemen
22、ts are not included in the scope of the Wind Turbine IMR Classification. 13 Stability In addition to complying with the requirements of Chapter 3, Section 3 of this Guide, the following requirements apply to Wind Turbine IMR units. Notice No. 1 May 2010 4 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OF
23、FSHORE UNITS .2008 13.1 Overturning Moment In calculating overturning moments for Wind Turbine IMR units, the effect of the operational loads acting simultaneously with the maximum design environmental force is to be determined. The full range of crane positions, elevations and weights is to be cons
24、idered in order to investigate the most critical scenarios. The wind area of the deck cargo is to be considered in the calculation of the overturning moment. When the Wind Turbine IMR unit is equipped to counter-ballast while lifting, the unit is to be able to withstand the sudden loss of the hook l
25、oad in each condition of loading and operation. The free surface effects are to be considered for those tanks which are ballasted. Specific reference may be made to Appendix 7-A1, “Stability Criteria for Counter-Ballasted Crane Units”. 13.3 Deck Cargo Loading conditions in the operations manual are
26、to include the effect of the deck cargo for each operating condition, using the estimated weight and the height of the center of gravity of the cargo based on the most severe loading assumptions. The loading conditions are to cover the full range of operating configurations, from no deck cargo on bo
27、ard to the maximum design deck load. If the unit is intended to carry deck cargoes that may accumulate water, such as open cargo bins or open pipes, a free surface correction is to be applied to afloat conditions. 15 Surveys For survey requirements, refer to applicable sections of Chapter 6 of this Guide. In addition, surveys of cranes after construction are to be carried out in accordance with Chapter 2, Section 7 of the ABS Guide for Certification of Lifting Appliances. (Renumber existing Section 7-6 as Section 7-7.)
