1、 Guide for the Classification of Pre-Laid Stationkeeping Systems for Mobile Offshore Units GUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS JUNE 2016 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 2016 American Bu
2、reau of Shipping. All rights reserved. ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword This Guide provides the evaluation procedure and technical requirements to verify the eligibility of a pre-laid stationkeeping system for the optional symbols (P-PL) (Position (pre-laid) m
3、ooring system), (M-PL) (Position (pre-laid) mooring equipment) and optional notations TAM-PL (Automatic position control system) and TAM-PL (Manual) (Manual position control system) for mobile offshore units. Mobile offshore units provided with position (pre-laid) mooring systems, in accordance with
4、 this Guide, will be designated in the Record by the optional classification symbol (P-PL). Only mooring equipment and components which are carried onboard the unit will be part of Class. Pre-laid mooring components and accessories such as anchors, piles, chains and other appurtenances that are alre
5、ady installed at the offshore location will not be part of Class. Mobile offshore units provided with thrust assist system and position (pre-laid) mooring system, in accordance with this Guide, will be designated in the Record by the optional classification notation TAM-PL or TAM-PL (Manual). Only m
6、ooring equipment and components which are carried onboard the unit will be part of Class. Pre-laid mooring components and accessories such as anchors, piles, chains and other appurtenances that are already installed at the offshore location will not be part of Class. This Guide becomes effective on
7、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 suggestions can be sent electronically by email to rsdeagle.org. ii ABSGUIDE FOR TH
8、E CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 Table of Contents GUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS CONTENTS SECTION 1 Introduction 1 1 General . 1 3 Position (Pre-laid) Mooring Systems 1 5 Position (Pre-laid
9、) Mooring Equipment . 1 7 Thruster-Assisted Mooring Systems (Automatic or Manual Position Control System) 1 9 Definitions . 2 11 Plans and Particulars to be Submitted 2 11.1 For (P-PL) Symbol . 2 11.3 For TAM-PL and TAM-PL (Manual) Notations . 3 13 References 3 SECTION 2 Technical Requirements for S
10、ymbol (P-PL) . 4 1 General . 4 3 Anchoring Systems . 4 5 Equipment . 4 7 Anchor Lines . 4 9 Anchors . 4 11 Surveys . 4 13 Control Station 4 SECTION 3 Survey Requirements for Symbols (P-PL) and (M-PL) 5 1 Surveys During Construction 5 1.1 Anchoring/Mooring System Foundations . 5 1.3 Anchor Winch/Wind
11、lass Trials . 5 1.5 Mooring Equipment and Systems 5 3 Surveys After Construction . 5 SECTION 4 Technical Requirements for Notations TAM-PL and TAM-PL (Manual) 6 1 General . 6 3 Thruster-Assisted Mooring (TAM) System 6 5 Anchoring Systems . 6 ABSGUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING
12、 SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 iii 7 Equipment . 6 9 Anchor Lines . 6 11 Anchors . 6 13 Surveys . 6 15 Control Station 6 SECTION 5 Survey Requirements for Notations TAM-PL and TAM-PL (Manual) 7 1 Surveys During Construction 7 1.1 Thrusters and Associated Equipment 7 1.3 Control and Monitor
13、ing System Equipment . 7 1.5 Anchoring/Mooring System Foundations . 7 1.7 Anchor Winch/Windlass Trials . 7 1.9 Mooring Equipment and Systems 7 3 Surveys After Construction . 7 iv ABSGUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 Section 1: Introductio
14、n SECTION 1 Introduction 1 General (1 June 2016) The requirements for conditions of Classification for the entire units and offshore structures are contained in the ABS Rules for Conditions of Classification Offshore Units and Structures (Part 1). Additional requirements specific to pre-laid station
15、keeping systems are contained in this Guide. The provisions of this Guide apply to mobile offshore units operating with pre-laid stationkeeping systems. Section 2 of this Guide provides the technical requirements for the optional symbol: (P-PL) (Position (pre-laid) mooring systems) for mobile offsho
16、re units. Section 3 of this Guide provides the survey requirements for the optional symbols: (P-PL) (Position (pre-laid) mooring systems) and (M-PL) (Position (pre-laid) mooring equipment) for mobile offshore units. Section 4 of this Guide provides the technical requirements for the optional notatio
17、ns: TAM-PL (Automatic position control system) and TAM-PL (Manual) (Manual position control system) for mobile offshore units. Section 5 of this Guide provide the survey requirements for the optional notations: TAM-PL (Automatic position control system) and TAM-PL (Manual) (Manual position control s
18、ystem) for mobile offshore units. At the request of the Owners, the pre-laid stationkeeping systems may be verified for compliance with the provisions of Sections 2 through 5 as applicable, with the appropriate class symbol or notation assigned. 3 Position (Pre-laid) Mooring Systems When requested b
19、y the Owner, ABS will certify the position (pre-laid) mooring capability of the unit in accordance with the requirements outlined in Section 2 of this Guide. A unit so certified for position mooring may be designated in the Record by the symbol (P-PL) placed after the symbols of classification in th
20、e Record, thus: null A1 (P-PL). 5 Position (Pre-laid) Mooring Equipment When requested by the Owner, the symbol (M-PL) may be placed after the symbols of classification in the Record, thus: null A1 (M-PL), which will signify that the mooring equipment, chain or wire rope (carried onboard the unit) w
21、hich have been specified by the Owner for position (pre-laid) mooring have been tested in accordance with the specifications of the Owner and in the presence of a Surveyor. 7 Thruster-Assisted Mooring Systems (Automatic or Manual Position Control System) (1 June 2016) When requested by the Owner, AB
22、S will certify the TAM (pre-laid) capability of the unit in accordance with the requirements outlined in this Guide. TAM (pre-laid) systems, which are fitted with a TA system that is capable of automatically maintaining the position and heading of the unit under specified maximum environmental condi
23、tions having an independent centralized manual position control with automatic heading control that have been built, installed and commissioned to the satisfaction of the Surveyors to the full requirements of this Guide, where approved by the Committee for service for the specified design environmen
24、tal conditions, will be classed and distinguished in the ABS Record by the notation null A1 (TAM-PL). ABSGUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 1 Section 1 Introduction TAM (pre-laid) systems, which are fitted with a TA system with centralized
25、 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 Surveyors to the full requirements of this Guide, where approved by the Committee f
26、or service for the specified design environmental conditions, will be classed and distinguished in the ABS Record by the notation null A1 (TAM-PL) (Manual). This notation assumes continuous attention of a TA operator. The symbol “null” (Maltese-Cross) signifies that the system was built, installed a
27、nd commissioned to the satisfaction of the Bureau Surveyors. TAM systems (with pre-laid mooring components and accessories) that have not been built under ABS survey, but which are submitted for Classification, will be subjected to special consideration. Where found satisfactory and thereafter appro
28、ved by the 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. 9 Definitions (1 June 2016) Position (pre-laid) mooring system. Position (pre-laid) mooring system is defined as a po
29、sition mooring system without the complete set of mooring equipment, anchors, chains or wire rope being carried onboard the unit. Typically mooring equipment and components carried onboard a unit designed for position (pre-laid) mooring will be the winches/windlasses and top chain or wire rope. Pre-
30、laid mooring. Pre-laid mooring is defined as mooring components and accessories other than those carried onboard the unit. It typically consists of anchors, piles, chain, cable, buoys and other appurtenances that are installed at the offshore location in advance of the arrival of the unit to assist
31、in its stationkeeping. Thrusters. Thrusters are devices capable of delivering side thrust or thrusts through 360 to improve the vessels maneuverability, particularly in confined waters. For more details, refer to 4-3-5/1.5 of the ABS Rules for Building and Classing Steel Vessels (Steel Vessel Rules)
32、. Thrust Assist (TA) System. Thrust assist system is a hydro-dynamic system which utilizes thrusters and dynamic positioning capability to assist the mooring system in controlling or maintaining the position and heading of the vessel by centralized manual control or by automatic response to the vari
33、ations of the environmental conditions within the specified limits. TAM (pre-laid) System. Position (pre-laid) mooring system integrated with TA system. Specified Maximum Environmental Conditions. The specified maximum environmental conditions are the specified wind speed, current and wave height un
34、der which the unit is designed to carry out intended operations. 11 Plans and Particulars to be Submitted (1 June 2016) 11.1 For (P-PL) Symbol For the (P-PL) symbol, the following plans are to be submitted to ABS: Arrangement and complete details of the mooring components and equipment that are carr
35、ied onboard the unit including their foundations and attachments to the unit A sample mooring analysis describing method of load calculations and analysis of dynamic system to determine the mooring line design loads, assumed mooring system configuration including arrangement of pre-laid mooring comp
36、onents and accessories Specifications and calculations for the mooring components and equipment that are carried onboard the unit Operations Manual which should clearly distinguish the mooring components and equipment that are classed under ABS from pre-laid mooring components that are assumed at th
37、e offshore location. 2 ABSGUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 Section 1 Introduction 11.3 For TAM-PL and TAM-PL (Manual) Notations For the TAM-PL and TAM-PL (Manual) notations, the following plans are to be submitted to ABS: General arrange
38、ments of the thruster(s) installation, its location of installation, together with its supporting auxiliary machinery systems, fuel oil tanks, foundations, watertight boundary fittings, etc. The rated power/rpm and the rated thrust are to be indicated. For azimuthal thrusters, the mechanical and con
39、trol systems for rotating the thruster assembly or for positioning the direction of thrust are to be submitted. Thruster specifications and calculations for thruster forces and power to counteract environmental forces are to be submitted. In addition, plans of each component and of the systems assoc
40、iated with the thruster are to be submitted. Arrangement and complete details of the mooring components and equipment that are carried onboard the unit including their foundations and attachments to the unit A sample mooring analysis describing method of load calculations and analysis of dynamic sys
41、tem to determine the mooring line design loads, assumed mooring system configuration including arrangement of pre-laid mooring components and accessories Specifications and calculations for the mooring components and equipment that are carried onboard the unit Operations Manual which should clearly
42、distinguish the mooring components and equipment that are classed under ABS from pre-laid mooring components that are assumed at the offshore location. 13 References (1 June 2016) The following Rules, Guides, Codes and Standards are referenced in this Guide: ABS Rules for Building and Classing Mobil
43、e Offshore Drilling Units (MODU Rules) ABS Guide for the Certification of Offshore Mooring Chain ABS Guidance Notes on the Application of Fiber Ropes for Offshore Mooring ABS Guide for the Classification Notation Thruster-Assisted Mooring (TAM, TAM-R, TAM (Manual) for Mobile Mooring Systems API RP 2
44、SK Design and Analysis of Stationkeeping Systems for Floating Structures API Spec 9A Specification for Wire Rope ABSGUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 3 Section 2: Technical Requirements for Symbol (P- PL) SECTION 2 Technical Requirements
45、for Symbol (P-PL) 1 General Units provided with position (pre-laid) mooring systems, in accordance with this Section, will be designated in the Record by the optional classification symbol (P-PL). 3 Anchoring Systems In general, the design of the anchoring system is to comply with the requirements o
46、f 3-4-A1/3 of the MODU Rules. 5 Equipment The winches and windlasses are to comply with the requirements of 3-4-A1/5.1 of the MODU Rules. Fairleads and sheaves are to be designed to prevent excessive bending and wear of the anchor lines. The attachments to the hull or structure are to be capable of
47、withstanding the stresses imposed when an anchor line is loaded to its rated breaking strength. 7 Anchor Lines In general, the anchor lines are to comply with the requirements of 3-4-A1/7 of the MODU Rules. 9 Anchors (1 June 2016) The design holding power of the anchors and pre-laid chains are to be
48、 submitted. 11 Surveys See Section 3 of this Guide for survey requirements. 13 Control Station The control station is to comply with the requirements of 3-4-A1/13 of the MODU Rules. 4 ABSGUIDE FOR THE CLASSIFICATION OF PRE-LAID STATIONKEEPING SYSTEMS FOR MOBILE OFFSHORE UNITS .2016 Section 3: Survey
49、 Requirements for Symbols (P- PL) and (M- PL) SECTION 3 Survey Requirements for Symbols (P-PL) and (M-PL) 1 Surveys During Construction Where optional ABS symbols (P-PL) or (M-PL) are requested, the position (pre-laid) mooring systems and equipment that is being carried onboard the unit is to undergo trials to demonstrate its capability, as applicable. 1.1 Anchoring/Mooring System Foundations Although the mooring system is an optional scope of classification, a units hull back-up structure/foundations are required to be surveyed in compliance wit
