1、 GUIDE FOR THE CLASSIFICATION NOTATION THRUSTER-ASSISTED MOORING (TAM, TAM-R, TAM (Manual) FOR MOBILE MOORING SYSTEMS JANUARY 2013 NOTICE NO. 1 December 2015 The following Changes were approved by the ABS Rules Committee on 17 November 2015 and become EFFECTIVE AS OF 1 DECEMBER 2015. (See http:/www.
2、eagle.org for the consolidated version of the Guide for the Classification Notation Thruster-Assisted Mooroing, 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 constr
3、uction, unless otherwise noted. (See 1-1-4/3.3 of the ABS Rules for Conditions of Classification (Part 1).) SECTION 1 INTRODUCTION 3 Application (Revise first paragarph of Subsection 1/3, as follows:) (1 December 2015) The provisions of this Guide apply to mobile offshore units operating with TAM sy
4、stems. Sections 2 and 3 of the Guide provide the technical requirements and survey requirements for the optional notations: TAM (Automatic position control system), TAM-R (Automatic position control system with redundancy), and TAM (Manual) (Manual position control system) for mobile offshore units.
5、 At the request of the Owners, the TAM system may be verified for compliance with the provisions of Sections 2 and 3, with the appropriate class notation assigned. This Guide may be used in tandem with Appendix 3-4-A1, “Guide for Position Mooring Systems” of the ABS Rules for Building and Classing M
6、obile Offshore Drilling Units (MODU Rules). ABSGUIDE FOR THE CLASSIFICATION NOTATION THRUSTER-ASSISTED MOORING FOR MOBILE MOORING SYSTEMS .2013 1 Notice No. 1 December 2015 (Revise Paragraph 1/3.1, as follows:) 3.1 Class Notations (1 December 2015) The requirements for conditions of Classification f
7、or the entire drilling units and offshore structures are contained in the ABS Rules for Conditions of Classification Offshore Units and Structures (Part 1). Additional requirements specific to thruster-assisted mooring systems are contained in this Guide. For TAM systems, which are fitted with a TA
8、system that is capable of automatically maintaining the position and heading of the unit under specified maximum environmental conditions having an independent centralized manual position control with automatic heading control that have been built, installed and commissioned to the satisfaction of t
9、he ABS Surveyors to the full requirements of this Guide, where approved by the Committee for service for the specified design environmental conditions, will be classed and distinguished in the ABS Record by the notation null TAM. For TAM systems, which are fitted with a TA system that is capable of
10、automatically maintaining the position and heading of the unit under specified maximum environmental conditions with redundancy as determined by failure mode and effects analysis (FMEA) having an independent centralized manual position control with automatic heading control that have been built, ins
11、talled and commissioned to the satisfaction of the ABS Surveyors to the full requirements of this Guide, where approved by the Committee for service for the specified design environmental conditions, will be classed and distinguished in the ABS Record by the notation null TAM-R. For TAM systems, whi
12、ch are fitted with a TA system with centralized manual position control and automatic heading control to maintain the position and heading under specified maximum environmental conditions that have been built, installed and commissioned to the satisfaction of the ABS Surveyors to the full requiremen
13、ts of this Guide, where approved by the Committee for service for the specified design environmental conditions, will be classed and distinguished in the ABS Record by the notation null TAM (Manual). This notation assumes continuous attention of a TA operator. The symbol “null” (Maltese-Cross) signi
14、fies that the system was built, installed and commissioned to the satisfaction of the ABS Surveyors. TAM systems that have not been built under survey to ABS, but which are submitted for Classification, will be subjected to special consideration. Where found satisfactory and thereafter approved by t
15、he Committee, it will be classed and distinguished in the Record by the notation described above, but the symbol “null” signifying survey during construction will be omitted. SECTION 2 GENERAL REQUIREMENTS (Revise Subsection 2/1, as follows:) 1 General (1 December 2015) In evaluating the capability
16、of the TAM system for mobile offshore units with the intent of assigning the optional notation TAM, TAM-R, or TAM (Manual), the provisions in this Section are to be complied with as applicable. (Revise Subsection 2/3, as follows:) 3 Analysis Conditions for Thruster-Assisted Mooring (TAM, TAM-R) Syst
17、em (1 December 2015) The TAM or TAM-R system shall be designed for the intact and damaged conditions as defined in Section 2, Tables 1A and 1B. 2 ABSGUIDE FOR THE CLASSIFICATION NOTATION THRUSTER-ASSISTED MOORING FOR MOBILE MOORING SYSTEMS .2013 Notice No. 1 December 2015 (Renumber Section 2, Table
18、1 as Section 2, Table 1A, as follows:) TABLE 1A Intact and Damaged TAM Definitions (Add new Section 2, Table 1B, as follows:) TABLE 1B Intact and Damaged TAM-R Definitions (1 December 2015) TAM-R Definition and Mooring Line Factor of Safety Mooring System Condition Thrust Assist (TA) System Conditio
19、n Intact Intact Intact Damaged Intact Damaged with redundancy as determined by failure mode and effects analysis (FMEA). Damaged Damaged Intact (Revise Section 2, Table 3, as follows:) TABLE 3 Allowable Thrust for Manual and Automatic Thrust Assist (TA) Systems (1 December 2015) Analysis Condition C
20、lass Notation Intact Damaged Allowable Thrust Automatic Thrust Assist Systems Equal to the available thrust or effective bollard pull when the thruster system is operating normally Equal to the available thrust TAM The available thrust shall account for the worst failure as determined by failure mod
21、e and effects analyses (FMEA). TAM-R Manual Thrust Assist Systems Equal to the available thrust or effective bollard pull when the thruster system is operating normally multiplied by Reduction Factor of 0.7 Equal to the available thrust multiplied by Reduction Factor of 0.7 TAM (Manual) ABSGUIDE FOR THE CLASSIFICATION NOTATION THRUSTER-ASSISTED MOORING FOR MOBILE MOORING SYSTEMS .2013 3
