ABS 160 NOTICE 4-2012 GUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS.pdf

1、 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 1 GUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS JULY 2008 NOTICE NO. 4 August 2012 The following Rule Changes become EFFECTIVE AS OF 1 AUGUST 2012. (See http:/www.eagle.org for the consolidated version of the Guide for Building

2、and Classing 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 Classificatio

3、n Offshore Units and Structures (Part 1).) CHAPTER 1 SCOPE AND CONDITIONS OF CLASSIFICATION SECTION 2 CLASSIFICATION SYMBOLS AND NOTATIONS (Revise Subsection 1-2/7, as follows.) 7 Temporary Mooring Equipment and Systems (1 August 2012) Temporary mooring is intended for release at anchor or in an eme

4、rgency while the unit is in the transit mode. The symbol will be placed after the symbols of classification to signify that the equipment for anchoring (temporary mooring) of the unit is in compliance with 3-4-1/3 of the ABS Rules for Building and Classing Mobile Offshore Drilling Units (MODU Rules)

5、. For self-propelled units, symbol is mandatory and all anchoring (temporary mooring) equipment is to be fabricated and tested in presence of and to the satisfaction of the attending Surveyor, and certified in accordance with 6-1-10/Table 1 of the MODU Rules. For non-propelled units fitted with an a

6、nchoring (temporary mooring) equipment, if the optional symbol is requested, equipment is to be fabricated and tested in presence of and to the satisfaction of the attending Surveyor, and certified in accordance with 6-1-10/Table 1 of the MODU Rules. (Revise Subsection 1-2/9, as follows.) 9 Position

7、 Mooring Equipment and Systems (1 August 2012) Position mooring is intended for maintaining position during the operation of the unit. 9.1 Symbol for Position Mooring Equipment The symbol will be placed after the symbols of classification, provided the position mooring equipment, certified by ABS in

8、 accordance with the optional class service requested by the Owner, at least complies with 3-4-1/5 of the MODU Rules and with requirements of the Owners specification. Notice No. 4 August 2012 2 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 9.3 Symbol for Position Mooring System The

9、 symbol will be placed after the symbols of classification to signify that the position mooring systems, certified by ABS in accordance with the optional class service requested by the Owner, are in compliance with Appendix 3-4-A1 of the MODU Rules and 3-4-1/7 of the MODU Rules and with requirements

10、 of the Owners specification. CHAPTER 1 SCOPE AND CONDITIONS OF CLASSIFICATION SECTION 4 PLANS AND DESIGN DATA TO BE SUBMITTED (Revise Subsection 1-4/7, as follows.) 7 Additional Plans (1 August 2012) Where additional class notations or certification under the other Rules, Guides or regulations as d

11、escribed in Section 1-1-5 of the ABS Rules for Conditions of Classification Offshore Units and Structures (Part 1) are requested, submission of additional plans and calculations may be required. CHAPTER 1 SCOPE AND CONDITIONS OF CLASSIFICATION SECTION 5 OPERATING MANUAL 1 (Revise first paragraph of

12、Subsection 1-5/1, as follows.) (1 August 2012) An operating manual which is consistent with the information and criteria upon which classification is based is to be placed aboard the unit for the guidance of the operating personnel. The primary language of the Operating Manual is to be English. Unit

13、s not meeting the criteria of 3-1-3/1.3 and 4-1-1/7.7 of the MODU Rules for unrestricted service are to have the notation Restricted Service placed in the Operating Manual. In cases where units are designed to the criteria for unrestricted service, but where certain additional conditions specified b

14、y the Owner are presented which do not meet the criteria for unrestricted service, the Operating Booklet is to contain a notation Limited Service Condition for such additional condition. Insofar as classification is concerned, the operating manual is to include, as appropriate, the following informa

15、tion: 1.3 (Revise Item 1-5/1.1i), as follows.) i) (1 August 2012) Limiting environmental conditions, including wave height and period, wind velocity, current velocity, service temperature of the unit (see 3-1-1/25 of the MODU Rules), minimum expected sea temperature, sea bed penetration, spud can-so

16、il stiffness, air gap, and water depth; Notice No. 4 August 2012 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 3 CHAPTER 1 SCOPE AND CONDITIONS OF CLASSIFICATION SECTION 6 CONSTRUCTION BOOKLET (Relocate Chapter 1, Section 6 to 7-1/Table 2.) CHAPTER 2 GENERAL SECTION 1 DEFINITIONS 5

17、Types of Unit (Revise Paragraph 2-1/5.1, as follows.) 5.1 Self-Elevating Unit (1 August 2012) A unit with movable legs capable of raising its hull above the surface of the sea and lowering it back into the sea. The hull has sufficient buoyancy to transport the unit to the desired location. Once on l

18、ocation, the hull is raised to a predetermined elevation above the sea surface on its legs, which are supported by the sea bed. The legs of such units may be designed to penetrate the sea bed, may be fitted with enlarged sections or footings, or may be attached to a bottom mat. CHAPTER 2 GENERAL SEC

19、TION 2 ENVIRONMENTAL LOADINGS 1 Loading Criteria (1 August 2012) (Revise first paragraph of Subsection 2-2/1, as follows.) A units modes of operation should be investigated using anticipated loads, including gravity and functional loads together with relevant environmental loads due to the effects o

20、f wind, waves, currents, and where deemed necessary by the Owner or designer, the effects of earthquake, sea bed supporting capabilities, ambient temperature, fouling, ice, etc. Where applicable, the loads indicated herein are to be adhered to for all types of mobile offshore units. The Owner is to

21、specify the environmental conditions for which the plans for the unit are to be approved. These design environmental conditions are to be recorded in the Operating Manual see 1-1-5/1.3i) of the MODU Rules Supplement to the ABS Rules for Conditions of Classification Offshore Units and Structures (Par

22、t 1). Notice No. 4 August 2012 4 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 (Revise 2-2/Table 1, as follows.) TABLE 1 Material Selection (1 August 2012) Section of MODU Rules Material Characteristics 3-1-4/1.3 Toughness 3-1-4/1.5 Materials Other than Steel 3-1-4/1.7 Service Tempe

23、rature 3-1-4/1.9 Hull Steel Grades 3-1-4/3 Selection of Grades 3-1-4/5 Note: Any reference to “drilling” in the MODU Rules is to be interpreted as referring to the type of operation for which the mobile offshore unit is designed and/or intended. CHAPTER 3 HULL CONSTRUCTION AND EQUIPMENT SECTION 1 PL

24、ANS AND DESIGN DATA TO BE SUBMITTED 1 Hull and Design Data (Add new last bullet and revise second-to-last bullet of Subsection 2-3/1, as follows.) (1 August 2012) A description of environmental conditions including the service temperature of the unit (see 3-1-1/25 of the MODU Rules) and minimum expe

25、cted sea temperatures for each mode of operation (1 August 2012) Critical structural areas identified in structural analyses (see 3-1-1/29 of the MODU Rules) CHAPTER 3 HULL CONSTRUCTION AND EQUIPMENT SECTION 2 HULL STRUCTURES AND ARRANGEMENTS 3 Common Structures (Revise Paragraph 3-2/3.5 and add new

26、 Subparagraph 3-2/3.5.1, as follows.) 3.5 Protection of Steel Work (1 August 2012) Unless otherwise approved, all steel work is to be suitably coated. Tanks or preload spaces intended for seawater ballast are to have a corrosion-resistant hard coating on all internal surfaces. Other effective method

27、s of corrosion protection will be specially considered. In cases where scantlings are based on 3-2/1.1 and 3-2/1.3, and corrosion control methods are not provided, the scantlings are to be suitably increased. 3.5.1 Performance Standards for Protective Coating (PSPC) Where requested by the Owner, a u

28、nit with protective coatings which are found to comply with the requirements in the ABS Guide for the Class Notation Coating Performance Standard (CPS) will be assigned and distinguished in the Record with the class notation CPS. Notice No. 4 August 2012 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFF

29、SHORE UNITS .2008 5 5 Self-Elevating Units (Revise Paragraph 3-2/5.3, as follows.) 5.3 General Requirements for Materials and Scantlings (1 August 2012) 5.3.1 Material Selection Grouping of structural elements of self-elevating units into material application categories (special, primary, secondary)

30、 is to be in accordance with 3-2-3/3.1 of the MODU Rules. 5.3.2 Scantlings Scantlings of the major structural elements of the unit are to be determined in accordance with the requirements of Sections 3-2/1 and 3-2/3. Where applicable, and except as outlined below, scantlings are also to meet the req

31、uirements of the Steel Vessel Rules or the Barge Rules. The section modulus requirement for framing members, in general, may be determined from the equations in 3-2-4/3 of the MODU Rules, where the values of c, h, s and are as indicated in 3-2/Figure 1. 7 Column-Stabilized Units (Add new Paragraph 3

32、-2/7.7, as follows.) 7.7 Material Selection (1 August 2012) Grouping of structural elements of column-stabilized units into material application categories (special, primary, secondary) is to be in accordance with 3-2-4/1.7 of the MODU Rules. (Renumber existing Paragraph 3-2/7.7 as 3-2/7.9.) 9 Weldi

33、ng, Forming and Weld Design (1 August 2012) (Delete Paragraph 3-2/9.3 and 3-2/Table 7 and revise 3-2/Table 6, as follows.) 9.1 Weld Design Weld design is to be in compliance with Section 3-2-6 of the MODU Rules, as shown in 3-2/Table 6. TABLE 6 Weld Design (1 August 2012) Section of MODU Rules Fille

34、t Welds 3-2-6/1 Full or Partial Penetration Corner or Tee Joints 3-2-6/3 Alternatives 3-2-6/5 Notice No. 4 August 2012 6 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 CHAPTER 3 HULL CONSTRUCTION AND EQUIPMENT SECTION 3 STABILITY AND WATERTIGHT/WEATHERTIGHT INTEGRITY 1 Stability (1 A

35、ugust 2012) (Revise Subsection 3-3/1, as follows.) All units are to have positive metacentric height in calm water equilibrium position for all afloat conditions, including temporary positions when raising or lowering. For the purpose of determining compliance with the stability requirements contain

36、ed herein, it is to be assumed that the unit is floating free of mooring restraints. However, detrimental effects of catenary mooring systems or of the thrusters for dynamically positioned units are to be considered. The metacentric height is to be specified for each mode of operation and guidance i

37、s to be included in the Operating Manual on the procedure to determine and satisfy the expected metacentric height. This may be accomplished by including the minimum metacentric height in the calculation of the allowable KG. The wind speeds referenced in this section are to be used to calculate over

38、turning moments for intact and damage stability calculations. These wind speeds are not intended to represent actual environmental limits. Stability requirements in accordance with 3-3-2/1 and 3-3-1/3 of the MODU Rules are to be complied with, as shown in 3-3/Table 1. (Revise 3-3/Table 1, as follows

39、.) TABLE 1 Stability (1 August 2012) Section of MODU Rules Stability Afloat 3-3-2/1.3 Intact Stability 3-3-2/1.3.1 Damage Stability 3-3-2/1.3.2, 1.3.3 Alternatives for Treatment of Void Spaces 3-3-2/1.3.4 Inclining Experiment 3-3-1/3 Note: Any reference to “drilling” in the MODU Rules is to be inter

40、preted as referring to the type of operation for which the mobile offshore unit is designed and/or intended. (Revise 3-3/Table 2, as follows.) TABLE 2 Stability Criteria (1 August 2012) Section of MODU Rules Righting Moment 3-3-2/3.3 Overturning Moment 3-3-2/3.7 Wind Tunnel Tests 3-3-2/3.9 Alternati

41、ve Stability Criteria 3-3-2/3.11 Note: Any reference to “drilling” in the MODU Rules is to be interpreted as referring to the type of operation for which the mobile offshore unit is designed and/or intended. Notice No. 4 August 2012 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 7 CH

42、APTER 3 HULL CONSTRUCTION AND EQUIPMENT SECTION 4 POSITION MOORING SYSTEMS (Revise Subsection 3-4/1 and add new 3-4/Table 1, as follows.) 1 Position Mooring Systems and Equipment (1 August 2012) The symbols , and are not required as a condition of classification, except as indicated hereunder and in

43、 8-5/9 of this Guide. All self-propelled units are to have temporary mooring equipment for anchoring while the unit is in the transit mode. The symbol is a condition of classification for self-propelled units. For non-self-propelled units, when requested by the Owner, the symbol may be placed after

44、the symbols of classification in the Record. 1.1 Temporary Mooring Equipment The symbol placed after the symbols of classification in the Record, thus: A1 , which will signify that the equipment for temporary mooring, for anchoring while the unit is in the transit mode, is in compliance with the app

45、licable requirements of Section 3-4-1 of the MODU Rules as shown in 3-4/Table 1 or with requirements corresponding to the service limitation noted in the units classification, which have been specially approved for the particular service. For drilling units with symbol , this requirement may be met

46、if position mooring equipment can be released in an emergency while the unit is in the transit mode. TABLE 1 Mooring Systems (1 August 2012) Section of MODU Rules Anchoring and Mooring Equipment 3-4-1/9 Equipment Mass and Size 3-4-1/11 Tests 3-4-1/13 Anchor Types 3-4-1/15 Windlass Support Structure

47、and Cable Stopper 3-4-1/17 Hawse Pipes 3-4-1/19 Note: Any reference to “drilling” in the MODU Rules is to be interpreted as referring to the type of operation for which the mobile offshore unit is designed and/or intended. 1.3 Position Mooring Equipment When requested by the Owner, the symbol may be

48、 placed after the symbols of classification in the Record, thus: A1 , which will signify that the mooring equipment, anchors, chain or wire rope which have been specified by the Owner for position mooring have been tested in accordance with the specifications of the Owner and in the presence of a Su

49、rveyor. See 7-1-A1/1.3 of the MODU Rules. 1.5 Position Mooring Systems When requested by the Owner, ABS is prepared to certify the position mooring capability of the unit in accordance with the requirements outlined in Appendix 3-4-A1 of the MODU Rules. A unit so certified for position mooring will be designated in the Record by the symbol placed after the symbols of classification in the Record, thus: A1 . Notice No. 4 August 2012 8 ABSGUIDE FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS .2008 CHAPTER 4 MACHINERY AND