Section 1 Instructions to Users... Page 1 Section 2 Systematic Index... Page 6 Section 3 Corrections... Page 13 PART 3 STRUCTURES AND EQUIPMENT -

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1 ;-;., RULES FOR CLASSIFICATION OF MOBILE OFFSHORE UNITS JULY 1985 INTRODUCTION Section 1 Instructions to Users... Page 1 Section 2 Systematic Index... Page 6 Section 3 Corrections... Page 13 RULES PART I REGULATIONS Chapter 1 General Regulations Chapter 2 Periodical Survey Regulations PART 2 MATERIALS AND WELDING Chapter 1 Steel and Iron Chapter 2 Aluminium, Copper and other Non-Ferrous Alloys Chapter 3 Welding January 1984 January 1985 January 1985 September 1982 January 1984 PART 3 STRUCTURES AND EQUIPMENT - Chapter I Structural Design, General Chapter 2 Special Designs, Equipment and Stability MAIN CLASS January 1985 January 1985 PART 4 MACHINERY AND SYSTEMS - Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 MAIN CLASS Machinery and Systems Design, General Propulsion and Auxiliary Machinery Boilers, Pressure Vessels, Thermal-Oil Installations and Incinerators Electrical Installations Instrumentation and Automation January 1985 September 1982 September 1982 January 1984 January 1985 PART 5 SPECIAL SERVICE AND TYPE - Chapter I Chapter 2 Chapter 3 ADDITIONAL CLASS Units for Transit and/ or Operation in Ice Accommodation Vessels and other Offshore Support Vessels Drilling Vessels and other Vessels for Offshore Operations July 1985 September 1982 January 1984 PART 6 SPECIAL EQUIPMENT AND SYSTEMS - ADDITIONAL CLASS Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Miscellaneous Notations Position Mooring (POSMOOR) Periodically Unattended Machinery Space (EO) Additional Fire Protection (F-AM) Drilling Plant (DRILL) DETNORSKE September 1982 January 1984 September 1982 January 1985 January 1984 VERITAS VERITASVEIEN I, 1322 H0VIK, NORWAY TELEPHONES: TELEX: 76192

2 "' '~-~~-~- ~......,... "'. Det norske Veritas (The Norwegian Veritas) is an independent Foundation with the object of safeguarding life and property at sea and ashore. The Foundation undertakes Classification and certification and secures the.quahty of ships, facilities and systems, and carries out research in connection with these functions. Moreover, the Foundation, provided its integrity is not imp.aired, may perform. assignments which utilize its knowledge or which contribute to develop knowledge that will be required for the performance of these assignments. The Foundation was established in 1978 as a direct continuation of the association Det norske Veritas which was established in Det norske Veritas has no liability for loss or damage caused by its officers, employees or others who act under assignment by the Foundation, whether or not such person has acted intentionally or negligently and whe_ther or not the loss or damage has affected the owner of a ship, facility or system, or a shipyard or others who have requested the Foundation's assistance, or any third party who without having any contractual relations with the Foundation has acted or made arrangements in reliance on decisions made or information given by or on behalf of the Foundation. Nor, in cases as mentioned in the preceding paragraph, can the individual or individuals who have personally caused the loss or damage be held liable. CHANGES IN THE RULES The following new Rule Chapter has been issued as of!st of July 1985: Pt. 5 Ch. I Units for Transit and/or Operation in Ice. The list of Corrections has been updated. ( ( Det norske Veritas 1985 Printed in Norway by Det norske Veritas

3 SECTION 1 INSTRUCTIONS TO USERS Mobile Offshore Units, Introduction A. Introduction. A I 00 General. Contents. B. The Rules. B I 00 B 200 Format. Numbering and cross references. B 300 Definitions. B 400 B 500 Units. Indexes and tables of contents. B 600 B 700 Amendments. Reprints from the Rules. B 800 Binders. C. Guidelines and Notes. c 100 General.. C 200 c 300 c 400 c 500 Guidelines. Classification Notes. Certi.fication Notes. Lists of Approved Manufacturers proved Products. D. Computer Programs. D I 00 D 200 General. HULDA. D 300 D 400 PILOT. SESAM-69. D 500 SESAM-80. A. Introduction. and Type Ap- A 100 General. 101 This booklet gives brief instructions to the users and include master indexes as well as a list of corrections to the Rules. 102 Format and editorial details of the Rules are described in the following to facilitate easy use of the present edition of the Rules. 103 Guidelines and notes as defined and listed in C have been worked out to aid the users of the Rules. Guidelines and Classification Notes are published as a companion volume to the Rules, while Certification Notes and Lists of Approved Manufacturers as well as Lists of Type Approved Products are obtained separately upon request. 104 Computers play an ever increasing part in the evaluation of technical feasibility, determination of scantlings and plan approval. A summary of the HULDA, PI LOT, SESAM-69 and SESAM-80 computer systems has been included to inform users looking for computer power. B. The Rules. B 100 Format. 101 The Rules for Classification of Mobile Offshore Units are published as a ring binder with six parts (Pt.), each consisting of chapters (Ch.) or booklets. The six parts are: Pt. I Regulations Pt. 2 Materials Pt. 3 Structures and Equipment - Main Class Pt. 4 Machinery and Systems - Main Class Pt. 5 Special Service and Type - Additional Class Pt. 6 Special Equipment and Systems - Additional Class. A list of updated Rule Chapters is printed on the front of the introduction booklet. 102 Relevant requirements in Pt. 1 to 4 are to be satisfied for the assignment of main class. The requirements stated in Pt. 5 to 6 are applicable to additional class and are in general complete for the relevant notation. This implies that requirements regarding e.g. electrical installations may be found in Pt. 4, 5 or 6 depending on the class notation in question. 103 The introduction booklet giving current status of the Rules in the form of dates relevant to each chapter will be issued with each set of amendments. It is important that the users check that the date on the front page of the relevant Rule Chapter corresponds with that given in the list printed on the front page of the latest introduction booklet. Amendments to the Rules will normally be published twice yearly, in January and in July. 104 The front page of each chapter or booklet has a standard format which should be self explanatory. 105 the changes introduced in the latest edition of each Chapter will be stat~d on the page immediately after the front page. 106 The first secti"on in each chapter will normally be termed General Requirements and will contain subsections covering such aspects as application of the Rules, definitions of symbols and terms, list of documentation etc. 107 Each subsequent section in the chapter will begin at the top of the page and will commence with a table of contents for the section. B 200 Numbering and cross references. 201 A combination of digits and letters is used for easy reference. It is felt that this combination provides better visibility with regard to levels, and is easier to handle than a five digit string, e.g. Pt. 3 Ch. I Sec. 1 A 100. Level Ref. example Principle Part Chapter Pt. 3 Ch. I Section Sec. I always a number Subsection A always a letter Item 100 always a number 202 Figures are numbered in increasing order within each section, e.g. Fig. 1, Fig. 2 etc. The figure number and title are centered immediately under the figure. 203 Tables are numbered in increasing order within each sub-section, e.g. Table A I, Table A2 etc. The table number and title are placed above the top left hand corner of the table. 204 Each chapter is written as self contained as possible. Cross references are generally given at the highest level consistent with feasibility to find the subject matter: (a) (b) (c) from part to part, e.g. see Pt. 2 Ch. I (i.e. down to chapter). from chapter to chapter within the same part, e.g. see Ch. l Sec. 3 (i.e. down to section). Reference to sub-section, e.g. Ch. I Sec. 3 A may be used where necessary for clarity. within a chapter, e.g. section to section, see Sec. 4 A I 00 (i.e. down to item) e.g. within a section, see A 103 e.g. within a sub-section, see 103.

4 Mobile Offshore Units, Introduction 2 B 300 Definitions. 30I Symbols and terms are in general defined at one of three levels in the Rules. A definition given at higher level is normally not repeated at a lower level, and references are not made to the definitions at higher level. When a symbol or term is defined elsewhere than in either of the three general levels, proper reference is made. 302 The first (higher) level of definitions is given in a separate subsection in Sec. l of the chapter in which the symbol or term is used. This level defines symbols and terms which are generally applied in the chapter or booklet. 303 The second (intermediate) level of definitions is given in subsection A of the section in which the symbol or term is used. This level normally defines symbols and terms occurring in various connections within the section. 304 The third (lower) level of definitions is given in connection with the formula or expression in which the symbol or term is used. The definition is normally given immediately following the formula and in any case within the same item as the formula. B 400 Units. 401 The units generally used in the Rules are the SI-units (International System of Units). Commonly used base and multiple units. are given in Table Al. Some derived units and their conversion relation to the TS-units (Technical Metric System of Units) are given in Tables AZ and A3, respectively. When other units are used these are particularly stated. Table Al Base or multiple SI-units. Quantity Symbol Name Length m metre cm centimetre mm millimetre Mass kg kilogram t tonne Time s second Electric current A ampere Table A2 Derived SI-units. Quantity Symbol Name/definition Frequency Hz hertz ~ lls Force N newton= kg m/s 2 kn kilo newton Pressure kn/m 2 ~ kpa, kilopascal bar ~ 10' Pa Stress N/mm 2 ~MPa, mega pascal Bending moment N m =J,joule Torsional moment kn m Work, energy J joule~ N m Heat kj kilojoule Power kw kilowatt Heat flow rate w watt Temperature "C centigrade B 500 Indexes and tables of contents. 501 Master indexes have been prepared for the complete Rules in the form of a syste_matic index and an alphabetical index. These indexes are presented in Sec. 2 and 3 respectively. The systematic index gives reference to se.ctions and subsections within each part/chapter whereas the alphabeti- Table A3 SI-unit IN I kn/m' I N/mm 2 I N m I J I kj I kw IW SI/TS Convertion relation. TS-convection relation 0,1020 kp 0,0102 kp/cm' I 0,20 kp/ cm' 0,1020 kp m 0,!020 kp m 0,2388 kcal 1,36 Hp 0,860 kcal/h cal index gives reference to the page number within appropriate part/chapter, e.g. Pt. 3 Ch. 1 Page 14. Note that each chapter is page numbered from I. The master indexes will be updated as required when chapters are amended. 502 Two levels of table of contents are given at the beginning of each chapter. A table of sections only is given on the front page of the chapter, providing the starting page number for each section within the chapter. A complete table of sections, subsections and main items is also included giving page number references at subsection level. 503 A table of subsections and main items is also included at the beginning of each section. In these tables page numbering is not given. B 600 Amendments. 601 Technical amendments to the Rules are the results of formal proposals from the technical staff at the Society and are based on practical experience from ships in service as well as comprehensive theoretical studies, research and development. These proposals are always discussed with regional technical committees consisting of representatives of platformbuilders, marine engine builders, steel manufacturers, owners, maritime governmental bodies, insurance con:i.pany associations and technical universities before being submitted to the Board for a decision. 602 Amendments to the Rules may be undertaken at any time, but will normally be published twice a year, in /, January and July, and will be forwarded to subscribers of the Rules as revised chapters together with an updated \ index card. 603 The superseded index card and chapters may be filed in a separate binder for future reference. B 700 Reprints from the Rules. 701 Reprints from the Rules are available from the Society on request. There is currently no subscription scheme for reprints. While the Society will publish details of amendments to the Rules in the press and in its own magazines, no special notification of amendments to buyers of reprints will be undertaken. B 800 Binders. 801 The mechanism in the binder provides for two stages of opening. The half open position is recommended for general reading and use of the Rules. The full open position should only be u~ed for insertion of new chapters or removal of old chapters. Every effort has been made to deliver a high quality binder. Defective binders may be returned to the Society for a free replacement. Additional binders for working files, historical files, etc., may be supplied at a nominal charge.

5 3 Mobile Offshore Units, Introduction C 100 General. C. Guidelines and Notes. 101 In an effort to aid the. various parties involved in the classification of ships, VERITAS has issued Guidelines and Classification _Notes giving practical information regarding classific_ation and other relevant regulations as well as guidance in new fields of technology. These publications are available as a complementary volume to the Rules, on a purchase or subscription basis, and contains Guidelines and Classification Notes as specified in 200 and 300. Each of the Guidelines and Classification Notes may also be purchased individually. 102 Products which are to be approved for installation onboard a vessel classed with the Society may be granted type approval. VERITAS has issued Lists of Approved Manufacturers and Type Approved Products containing the names of manufacturers and types of products which have been granted approval. The approval is time limited and updated lists are normally published anually. C 200 Guidelines. 201 Guidelines are publications which give information and advice on technical and formal matters related to the design, building, operating, maintenance and repair of vessels and other objects, as well as the services rendered by the Society in this connection. Aspects concerning classification may be included in the publication. 202 The following Guidelines have been prepared: C 300 Design and Classification of Roll on/roll off Ships, May Prevention of Harmful Vibration in Ships, July Internal Control, Mobile Offshore Units (Owners' Control System), September Classification Notes. 301 Classification Notes are publications which give practical information on classification of ships and other objects. Examples of design solutions, calculation methods, specifications of test procedures, as well as acceptable repair methods for some componerits _are given as interpretations of the more general rule requirements. 302 The following Classification Notes have been prepared: No. 4.1 Guidance Manual for Inspection and Repair of Bronze Propellers, May (Reprint of 1974). No. 4.2 Guidance Manual for Inspection and Repair of Steel Propellers, May (Reprint of August 1977). No. 5. Plastic Pipes for Use on Board Ships, May (Reprint of December 1977). No. 6. Fire Test of Components Intended for Use in Piping Systems on Board Ships, May (Reprint of 1975). No. 7. Ultrasonic Inspection of Weld Connections, May (Reprint of November 1978). No. IO.I Ships and Mobile Offshore Units, Planned Maintenance Systems as Basis for Survey for Retention of Class, May No. 13. No. 14. Erosion and Corrosion in Piping Systems for Sea Water, May (Reprint of January 1979). Instrumentation and Automation, Computer Based Systems, July No Buckling Strength Analysis of Mobile Offshore Units, June 1984, No Fatigue Strength,,nalysis for Mobile Offshore Units, August No. 3 I. I Strength Analysis of Hull Structures in Bulk Carriers and Container Ships, May No Strength Analysis of Hull Structures in Roll on/ Roll off Ships, May No Strength Analysis of Hull Structures in Tankers, May No Strength Analysis of Main Structures of Self. Elevating Units, May No Strength Analysis of Rudder Arrangements; Ja. nuary No Strength Analysis of Container Securing Arrangements, July No. 41.l Reduction Gears in Lifting Machinery for Self-Elevating Units, September C 400 Certification Notes. 401 Certification Notes are publications which contain principles, accept criteria and practical information related to the Society's consideration of objects, personnel, organizations, services and operations, in connection with issuance of certificates or declarations, which are not necessarily related to classification. 402 The.following Certification Notes have been prepared or are under preparation: Series No. 1 Quality System Certification. No. I.I Basic Service Description (June 1985). No. 1.3 Quality Assurance Requirements for the Manufacturing Phase (June 1985). Series No. 2 Approval Schemes. No. 2.2 Certification Scheme Based on Type Approval (January 1982). No. 2.4 Type Approval of Instrumentation and Automation Equipment (January 1982). No. 2.5 Type Approval of Loading Instrument for Ships (June 1985). No. 2.6 Certification of Offshore Mooring Chain (July 1985). Series No. 3 Marine Operations. No. 3.1 Towing Declarations (January 1982). No. 3.2 Declarations on Transit. Location and Lay-up of Mobile Offshore Units (June 1982). No. 3.3 Declarations on Lay-up of Ships (August 1983). No. 3.4 Declarations on Preservation of Laid-up Ships (August 1976). C 500 Lists of Approved Manufacturers and Type Appcoved Products. 501 Lists of approved Manufacturers. The following list has been issued: No. I Metallic and Fibre Materials. No. 2 Welding Consumables and Shop Primers, Welded Boilers, Pressure Vessels and Welding Procedures. 502 List of Type Approved Products. The following lists have been issued: No. 3 No. 4 No. 5 No. 6 No. 7 No. 8 Structures and Related Equipment. Machinery. Mechanical Equipment and Piping. Electrical Equipment. Instrumentation and Automation. Fire Restricting Materials and Fire Technical Equipm~nt. 503 The lists are normally updated annually. D 100 General. D. Computer Programs. 101 Computers play an increasingly important role in both evaluation of technical feasibility, determination of scantlings by direct calculation and as a means of speeding up the approval process. D 200 HULDA. 201 Plan approval has traditionally been supported by the HULDA hull analysis and design package. The system is designed for the UNIVAC 1100 series computers and comprises a suite of independent programs which

6 Mobile Offshore Units, Introduction 4 inay be run separately, or as part of an integrated system. The basis modules are: Hull definition forms Wave load and ship motion Longitudinal strength Hull section programs Frame and grillage analysis programs. 202 The longitudinal strength and hull section programs in HULDA can be replaced by corresponding programs in the PILOT system described below. D 300 PILOT. 301 As an alternative for users who do not have access to a la.rge computer, or who might wish to implement decentralized computation, VERITAS offers a desk top computer system based on the Hewlett Packard 9845 and Series 200 desk top computers. The system is named PI LOT and contains interactive programs covering: Preliminary ship design, Le.: generation of lines, hydrostatics ahd propulsion data from model series and steel weights related to bulk carriers and tankers. Hull geometry calculations a nd statutory requirements, i.e.: hull definition, hydrostatics, stability and plot of hydrostatic and cross curves. General strength, i.e.: longitudinal hull strength, area properties of arbitrary sections at structural members, buckling of plates and profiles. VERIT AS rule requirements related to hull section scantling analysis, deckhouses, decks for wheel loading, propeller blade thicknesses, gears, etc. 302 In most countries this system may be offered as a turn-key system including the computer, or may be obtained from our program library on a lease basis. This system is an important tool at selected VERIT AS locations in keeping with our policy of providing a consistently high level of technical expertise and capability throughout the world. D 400 SESAM SESAM-80 is a general purpose finite element progn1m system developed by VERITAS. The system incorporates advances made during the last decade in structural and solid mechanics, numerical analysis and computer technology. SESAM-80 is designed to handle static and dynamic analysis of: 2- and 3-dimensional truss/frame structu.res. 2- and 3-dimensional inelnbrane structures thin and thick shell strliciures axi-symmetric solids 3-dimensional solids Geometrical as well as material non-linerarities ma)' be taken into account. Particular emphasis is placed upon the development of efficient pre- and post-processors. 402 SESAM-80 includes integrated program packages for extensive analysis of: ships mobile offshore units (column stabilized and self-elevating) tension leg platforms fixed steel platforms For these structu_res. the analysis may include calculation of loads, response, capacity and checking against codes etc. 403 Several alternative methods are available. The multilevel. superelement technique may be used for static as well as for dynamic analysis. A number of programs for calculation of different types of loading, e.g. wave loads and temperature distributions, are integrated in the SESAM-80 system. Fluid-structure and soil-structure may also be taken into account. 404 The developm.ent of non-linear programs is concentrated into the FENRIS system. The theoretical basis for this system is broad, allowing for very large displacements and rotations, finite strains, almost any type of material non-linearity, static and dynamic behaviour etc. It is expected that the system will be well suited for solving a great variety of problems involving structural instabilities, collapse, residual strength, fatigue etc. 405 The SESAM-80 system is available from VERl TEC A/S, a subsidiary of Det norske Veritas. (

7 5 Mobile Offshore Units, Introduction SECTION 2 SYSTEMATIC INDEX PART 1 CHAPTER 1 GENERAL REGULATIONS Sec. 1 Rules of the Society. A. Definitions. B. Scope. C. Rules to be Applied. Sec. 2 Classification Principles. A. Classification Concept. B. Class and Register Notations. Sec. 3- Classification Procedure. A. Assignment of Class. B. Retention of Class. C. Withdrawal of Class. PART 1 CHAPTER 2 PERIODICAL SURVEY REGULATIONS A. Survey Intervals and Conditions. B. Postponement of Periodical Surveys. C. Alternative Survey Arrangements. Sec. 2 Survey Extent - Main Class. A. Annual General Survey. B. Intermediate General Survey. C. Special Periodical Survey. Sec. 3 Survey Extent - Additional Class. A. Periodically Unattended Machinery Space. Class Notation EO. B. Dynamic Positioning System. Class Notation DYNPOS. C. Additional Fire Protection. Class Notation F-AM. D. Fire Fighters. Class Notation Fire Fighter I or II or Ill. E. Position Mooring Equipment. Class Notation POSMOOR. F. Crane. Class Notation CRANE. G. Helicopter Deck. Class Notation HELDK. H. Drilling Derrick. Class Notation DRL. I. Drilling Plant. Class Notation DRILL. J. Diving Systems. Class notation DSV-1 or II or Ill. PART 2 CHAPTER I STEEEL AND IRON C. Testing. D. Documentation and Branding. Sec. 2 Rolled Steel for Structural Application. B. Normal Strength Steel. C. High Strength Steel. D. Extra High Strength Steel. E. Testing. F. Repair of Defects. Sec. 3 Rolled Steel for Boilers, Pressure Vessels and Special Applications. B. Carbon and Carbon Manganese Steel. C. Alloy Steel. D. Testing. E. Identification of Materials. Sec. 4 Clad Steel Plates. B. Base Material. C. Cladding Metal. D. Testing. E. Repair and Rejection. Sec. 5 Steel Tubes and Pipes. B. Testing. Sec. 6 Forgings. B.Testing. C. Welding and Weld Repairs. Sec. 7 Bars for Chain Cables. B. Testing. C. Identification of Materials Sec. 8 Steel Castings. B. Castings for General Application. C. Castings for BOilers and Pressure VesSel. D. Propeller Steel Castings. E. Chain Cable Castings., F. Castings for Structural Members with Higher Toughness Requirements. G. Steel Castings for Design Temperatures below -10 C and for Liquified Gas Systems. H. Heat Treatment. I. Testing. J. Rectification of Defective Castings. K. Welding of Structural Members Sec. 9 Iron Castings. B. Nodular Cast Iron. C. Greay Cast Iron. D. Testing. E. Repair of Defects. PART 2 CHAPTER 2 ALUMINIUM, COPPER AND OTHER NON-FERROUS ALLOYS C. Testing. D. Documentation and Branding. Sec. 2 Wrought Aluminium Alloys. B. Testing. C. Repair of Defects. D. Identification of Materials. Sec. 3 Copper Alloys. B. Castings for Valves and Fittings. C. Propeller Castings. D. Tubes.

8 Mobile Offshore Units, Introduction 6 Sec. 4 Heat Resisting Non-Ferrous Alloys. B. Testing. PART 2 CHAPTER 3 WELDING C. Testing. Sec. 2 Welding Procedures and Approval of Welders. B. Welding Procedures. C. Approval of Welders. Sec. 3 Welding Consumables. B. Electrodes for Manual, Metal-Arc Welding. C. Wire Flux Combinations for Submerged Arc Welding. D. Combinations for Use in One-side Automatic Welding Processes. E. Wire-Gas Combinations and Wires for Automatic and Semi-Automatic Welding. F. Combinations for Use in Electro-Slag and Electro-Gas Welding Processes. G. Welding Consumables for Welding of Steel Grades NV 2-4 and NV 4-4 for Low-temperature Applications. H. Welding Consumables for Low-Alloy, Heat Resisting Steels (NV 7-1,7-2 and 7-3). I. Welding Consumables for Welding of Steel Grades NV 20-00, NV 20-0, NV 20-1 and NV J. Welding Consumables for Welding of Normalized or Quenched and Tempered Structural Steels with Specified Yield Stress 420 N/mm 2 and Higher. Sec. 4 Welding of Clad Steel Plates. B. Welding. PART 3 CHAPTER l STRUCTURAL DESIGN GENERAL D. Appendix to the Classification Certificate. Sec. 2 Materials. B. Structural Steel. C. Alternative Structural Materials. Sec. 3 Design Principles. B. Environmental Conditions. C. Strength Analysis. D. Deflections and Vibrations. Sec. 4 Design Loads. B. Environmental Data. C. Flow Induced Forces. D. Local Pressures and Forces. E. Accidental Impact Energy. Sec. 5 Overall Strength. A. General B. Design Load Conditions. C. Calculation Methods. D. Usage Factors and Permissible Stresses. E. Structures Other than Steel. Sec. 6 Plating and Stiffeners. B. Bending. C. Buckling. Sec. 7 Girders and Girder Systems. B. Bending and Shear. C. Buckling. D. Complex Girder Systems. E. Girder Brackets. Sec. 8 Weld Connections. B. Types of Welded Steel Joints. C. Size of Connections. D. Welding of Aluminium Structures. Sec. 9 Corrosion Protection. B. Acceptable Corrosion Protection. C. Cathodic Protection. Sec. 10 Manufacture, Workmanship and Testing. A. Manufacturing Conditions and Workmanship. B. Testing during Construction. PART 3 CH-1.PTER 2 SPECIAL DESIGNS, EQUIPMENT AND STABILITY A. Classificaiton. Sec. 2 Column Stabilized Units. B. Air Gap. C. Design Load. D. Overall Strength. E. Local Strength. F. Resistance Against Collosion and Dropped Objects. Sec. 3 Self-elevating Units. B. Air Gap. C. Design Load. D. Overall Strength. E. Local Strength. F. Overturning Stability on the Sea Bed. G. Resistance Against Collision and Dropped Objects. Sec. 4 Steering Arrangements. ( A. General B. Materials. C. Arrangement and Details. D. Design Loads and Stress Analysis. E. Sternframes. F. Rudders. G. Rudder Stocks and Pintles. H. Steering Gears. I. Testing. Sec. 5 Mooring and Towing Equipment. B. Structural Arrangement for Mooring Equipment. C. Equipment Specification. D. Anchors. E. Anchor Chain Cables. F. Steel Wire Ropes. G. Windlass and Chain Stopper. H. Fairleads. I. Wire End Attachments. J. Arrangement and Devices for Towing. (

9 7 Mobile Offshore Units, Introduction Sec.. 6 Stability. 8. Inclining Test. C. Loading Conditions. D. Stability Calculations. E. Intact Stability. F. Damage Stability. Sec. 7 Watertight Integrity, Freeboard and Watertight Closing Appliances. A. Watertight Integrity. B. Freeboard. C. Weathertight Closing Appliances. PART 4 CHAPTER I MACHINERY AND SYSTEMS DESIGN, GENERAL D. Signboards. Sec. 2 Materials. B. Machinery Parts. C. Piping Systems. Sec. 3 Design Principles. A. Arrangement. B. Construction and Function. C. Reliability and Availability. D. Instrumentation and Automation. Sec. 4 Platform Piping Systems. B. Ballast, Bilge and Drainage Systems General. C. Ballast and Bilge Systems for Column Stabilized Units. D. Ballast and Bilge System for Self elevating Units. E. Air, Overflow and Sounding Pipes. F. Storage and Transfer Systems for Liquids with Flashpoint below 60 C (e.g. Helicopter Fuel). Sec. 5 Machinery Piping Systems. B. Cooling Systems. C. Lubricating Oil Systems. D. Fuel Oil Systems. E. Feed Water and Condensate Systems. F. Steam Systems. G. Hydraulic' Power Supply. H. Pneumatic Power Supply. I. Pneumatic Starting-Arrangements. Sec. 6 Pipes, Pumps, Valves, Flexible Hoses and Detachable Pipe Connections etc. A. Pipes. 8. Pumps. C. Valves. D. Flexible Hoses. E. Detachable Pipe Connections. F. Seawater Strainers. G. Socket Welded Joints. Sec. 7 Fire Safety. B. Fire Integrity and Fire Protection. C. Fire Extinguishing Systems. D. Fire Detection System. E. Firemen's Outfits and Breathing Apparatus. F. Arrangements in Machinery and Working Spaces. G. Provisions for Helicopter Facilities. H. Storage of Gas Cylinders. I. Miscellaneous. Sec. 8 Manufacture, Workmanship and Testing. A. Welding. B. Brazing of Copper and Copper Alloys. C. Pipe Bending. D. Hydrostatic Tests of Piping. E. Functional Testing. Sec. 9 Spare Parts. PART 4 CHAPTER 2 PROPULSION AND AUXILIARY MACHINERY Sec. 1 General Requirements B. Definitions and Design Criteria. D. Signboards. Sec. 2 Diesel Engines B. Materials. C. Arrangement. D. Design and Construction. E. Governing and Monitoring. F. Testing. Sec. 3 Reduction Gears B. Materials. C. Arrangement. D. Design and Construction. E. Monitoring. F. Testing. Appendix: Gear Calculation Factors B. Geometrical definitions. C. Load-increasing factors. D. Factors for actual tooth root stresses. E. Material fatigue values. F. Safety factors. G. Relative stress correction factor. H. Relative influence of the notch sensitivity on the fatigue strength.. I. Zone factor. J. Lubrication factor. K. Influence of the depth of the surface hardened layer on the fatigue strength.. Sec. 4 Shafting A. General B. Materials. C. Arrangement and Dynamics. D. Design and Scantlings. E. Testing. Sec. 5 Propellers B. Materials. C. Arrangement. D. Design and Scantlings. E. Governing and Monitoring. F. Testing. Sec. 6 Thrusters B. Materials. C. Arrangement. D. Design and Construction. E. Control and Monitoring. F. Testing. Sec. 7 Jacking Machinery B. Materials. C. Arrangement and General Design.

10 Mobile Offshore Units, Introduction 8 D. Scantlings. E. Control and Monitoring. F. Testing. PART 4 CHAPTER 3 BOILERS, PRESSURE VESSELS, THERMAL-OIL INSTALLATIONS AND INCINERATORS C. Docume ntation. D. CO, Bottles. E. Signboards. Sec. 2 Materials. B. Boilers and Pressure Vessels. C. Thermal-Oil Installations. Sec. 3 Arrangement. A. Boilers and Pressure Vessels. B. Thermal-Oil Installations. C. Incinerators. Sec. 4 Basic Design Requirements. B. Design Criteria. C. Scantlings of Shells and Flat and Dished Ends. D. Openings and Compensations. E. Covers for Inspection Openings and Manholes. Sec. 5 Particular Design Requirements for Boilers. A. Shells and Headers of Cylindrical Sections. B. Headers of Rectangular or Irregular Sections. C. Flat Plates Supported by Stays, Combustion Chambers Excepted. D. Furnaces, Uptakes and Cross Tubes Subjected to External Pressure. E. Combustion Chambers in Horizontal Cylindrical Boilers. F. Tube Plates in Vertical Boilers. G. Stay Bolts, Longitudinal Stays and Stay Tubes. H. Tubes. Sec. 6 Mountings and Fittings. B. Safety Valves. C. Stop Valves and Check Valves. D. Blow Down Valves and Test Valves for Boiler Water. E. Gauges. Sec. 7 Instrumentation and Automation.. B. Boilers. C. Water Heaters. D. Thermal-oil Heaters. E. Incinerators. Sec. 8 Manufacture, Workmanship and Testing. A. Manufacture. B. Workmanship. C. Heat treatment. D. Testing. Sec. 2 Design Principles. A. Environmental Conditions. B. Explosion-Protected Equipment. C. Enclosures. D. Earthing of Non-Current-<;arrying Parts. E. Electromagnetic Noise and Interference. F. Insulating Materials. G. Marking. Sec. 3 System Design. A. Supply Systems. Maximum Voltages. Voltage and Frequency Variations. B. Capacity and Arrangement of Generators and Power Convertors. C. Emergency Source of Power and Emergency Installation. D. Stationary Accumulator Batteries. Electric Starting Arrangements for Main and Auxiliary Engines. Charging stations for Battery Trucks. E. Distribution. F. Circuit Protection. G. Control Gear for Motors and other Consumers. H. Choice of Cable Types. Sec. 4 Switchgear and Control Gear Assemblies. A. Main and Emergency Switchboards. B. Distribution Switchboards. C. Enclosures for Motor Control Gear. D. Testing and Certification. Sec. 5 Rotating Machines. A. Requirements Common to Genera.tors and Motors. B. Additional Requirements to Generators. Sec. 6 Static Convertors. A. Transformers. B. Static Convertors with Semiconductors. Sec. 7 Cables. A. Construction. B. Testing. Sec. 8 Miscellaneous Equipment. A. Switchgear. Control gear. B. Fuse-gear. C. Socket-outlets. D. Lampholders. E. Lighting Fittings. F. Heating Equipment. G. Marking. Sec. 9 Installation and Testing. B. Essential or Important Equipment. C. Cables. D. Testing. Sec. 10 A.C. Supply Systems above I kv to and including 11 kv. A. General Requirements. B. Design Principles. C. System Design.. D. Switchgear and Controlgear Assemblies. E. Rotating Machines. F. Static Convertors. G. Cables, Construction and Testing. H. Miscellaneous Equipment. I. Installation and Testing. : ' ( PART 4 CHAPTER 4 ELECTRICAL INSTALLATIONS SEC. 1 GENERAL REQUIREMEN:TS. D. Signboards. PART 4 CHAPTER 5 INSTRUMENTATION AND. AUTOMATION Sec. 1 General Requirements C. Testing of Plant on Board.

11 9 Mobile Offshore Units;" Introduction Sec. 2 System Design. B. Automatic Control Systems. C. Alarm Systems. D. Safety Systems. E. Indicating and Recording Systems. F. Remote Control Systems. G. Sequence Control Systems. H. Indication and Transfer of Responsibility. I. Computer Based Systems. J. Monitoring for Electric Propulsion Machinery. Sec. 3 Component Design and Installation. B. Environmental Conditions. C. Electrical and Electronic Equipment. D. Pneumatic and Hydraulic Equipment. PART 5 CHAPTER 1 UNITS FOR TRANSFER AND/OR OPERATION IN ICE Sec. 1 Units for Occasional Transit and/or Operation in First Year Ice Conditions. D. Ice Strengthening. PART 5 CHAPTER 2 ACCOMMODATION VESSELS AND OTHER OFFSHORE SUPPORT VESSELS Sec. 2 Accommodation Vessels. B. Structural Arrangement and Strength. C. Mooring Equipment. D. Machinery and Systems. E. Stability and Floatability. Sec. 3 Fire Fighters. B. Basic Requirements. C. Self-Protection of the Vessel. (Class Notation I). D. Water Monitor System. E. Foam Monitor System. (.Class Notation Ill). F. Pumps and Piping. G. Mobile Fire Fighting Equipment. H. Fireman's Outfit. Sec. 4 Crane Vessels. B. Structural Arrangement and Strength. C. Stability and Floatability. D. Testing. PART 5 CHAPTER 3 DRILLING VESSELS AND OTHER VESSELS FOR OFFSHORE OPERATIONS Sec. 2 Drilling Vessels. B. Structural Arrangement and Strength. C. Stability and Floatability. D. Mooring and Towing Equipment. E. Drilling Related Equipment and Systems. F. Pumping and Piping Arrangement. G. Protection against Fire and Explosion. H. Electrical Installations in Hazardous Areas. I. Machinery Installations in Hazardous Areas. J. Safety Features. Sec. 3 Pipe Laying Vessels. B. Structural Arrangement and Strength. C. Mooring Equipment. D. Pipe Laying Equipment and Installation. E. Stability and Floatability. Sec. 4 Dredgers. B. Structural Arrangement and Strength. C. Stability and Floatability. PART 6 CHAPTER 1 MISCELLANEOUS NOTATIONS Sec. 2 Helicopter Decks. B. Design Loads. C. Strength Requirements. Sec. 3 Cranes. B. Design Loads. C. Overturning and Sliding. D. Testing. PART 6 CHAPTER 2 POSITION MOORING (POSMOOR) B. Documentation. C. Structural Arrangement for Mooring Equipment. Sec. 2 Environmental Conditions and Loads. A. Environmental Conditions. B. Environmental Loads. Sec. 3 Mooring System Analysis. A. Method. B. Design Conditions. C. Permissible Usage Factors. D. Use of Thrusters. Sec. 4 Mooring Equipment. A. Anchors. B. Anchor Lines of Chain Cables/Steel Wire Ropes. C. Fairleads. D. Windlasses, Winches and Stoppers. Sec. 5 Tests. A. Test of Windlass/Winch. PART 6 CHAPTER 3 PERIODICALLY UNATTENDED MACHINERY SPACE (EO) D. Signboards.

12 Mobile Offshore Units, Introduction 10 Sec. 2 System Arrangement. B. Automatic Control System. C. Alarm System. D. Safety System. E. Bridge Control of Propulsion Machinery. F. Communication System. G. Computer Based Systems. Sec. 3 Extent of Monitoring and General Requirements. A. Monitoring. B. Arrangement on the Bridge. C. Arrangement in the Engine Room. D. Electric Power Supply. Sec. 4 Precautions Against Fire. A. Shielding. B. Fire Detection. C. Fire Alarm System. D. Remote Control. Sec. 5 Testing. B. Testing of Remote Control System. C. Blackout Test. D. Testing of Boiler Plant. PART 6 CHAPTER 4 ADDITIONAL FIRE PROTECTION {F-AM) D. Signboards. Sec. 2 Accommodation. B. Fire Protection. C. Fire Extinguishing Systems. D. Fire Instruction. Sec. 3 Machinery Spaces. B. Oil Systems. C. Ventilation. D. Fire Pumps. E. Main Extinguishing System. F. Halon Total Flooding Extinguishing System. G. High-Expansion Foam Extinguishing System. H. Local Extinguishing Systems. I. Hose Stations. J. Dry Powder Extinguishers. K. Fireman's Outfit. PART 6 CHAPTER 5 DRILLING PLANT {DRILL) Sec. 1 General. A. Application. C. I?rincipal Requirements. Sec. 2 Systems. B. Main Hoisting System. C. Mud System. D. Kill and Choke System. E. Blowout Prevention System. F. Auxiliary Hoisting Equipment. G. Well Test Equipment. H. Bulk Mud and Cement Systems. Sec. 3 Equipment. B. Recognized Codes and Standards. C. Design Requirements. D. Materials. E. Manufacture, Workmanship and Testing. F. Documentation. Sec. 4 Piping. B. Design Documentation. C. Piping Design. D. Piping Materials. E. Manufacture and Workmanship. F. Inspection and Testing. G. Fabrication Documentation. Sec. 5 Structures. B. Drilling Derrick. C. Flare Boom. Sec. 6 Materials. B. Specific Requirements. C. Corrosion. D. Documentation and Identification. Sec. 7 Electrical Equipment. Sec. 8 Instrumentation and Automation. Sec. 9 Fire Safety. B. Documentation. C. Fire Fighting. D. Gas Detection/Protection. Sec. 10 Manufacture, Workmanship and Te.sting. B. Manufacture. C. Examination and Testing. D. Documentation. Sec. 11 In-Service Inspection. B. Derrick Pipe Racking System and Flare Booms. C. Overhead Drilling Equipment. E. Pressure Vessels. F. Piping Systems (incl. Related Equipment). G. Flexible Pipes. H. Mud and Cement Pumps Fluid Ends. I. Marine Riser. J. Blowout Preventers. K. Lifting Appliances and Hoisting Equipment. ( (

13 Pt. 3 Ch. 1 Sec. 6 Page 20 In item B JOI, the definition of the factor k, should read: 11 Mobile Offshore Units, Introduction SECTION 3 CORRECTIONS - the motor and transformer have heatirig element for still-stand heating - the room is not used as pump room for ballast fuel oil etc. ' kp kp kp is dependent on support condition. ~ 1,0 for clamped edges. ~ 0,5 for simply supported edges. Pt.3 Ch.2 Sec. 5 Page 16 In item A 304, the requirements for material certificates should read: Material certificates: Anchor Anchor chain cable and accessories (shackles, swivels etc.). Steel wire rope (WC) Windlass cable lifter Winch drum and drum flanges Shafts for cable lifter and/ or drum Pawl wheel, stopper and couplings Gear shafts and gear wheels (WC) Windlass/winch framework (WC) Brake components Chain stopper Fairlead (cable lifter/sheave, shafts, housing and supports). Wire end attachment (WC) Shackles, flounder plate and chain 0200 E 200, 300 F G 200 G G 200 H200 I 200 J 200 For items referred with (WC) works' certificate from approved manufacturer will normally be accepted. Page 25 Item H 105 should read: 105 For a steel cable fairlead the ratio between pitch diameter of fairlead wheel and nominal wire rope diameter is not to be less than 16. This applies to all sheaves including combined wire rope/ chain arrangement of a mooring system. The groove in fairlead wheel is normally to satisfy the relations as indicated in Fig ~ y ~ 150 1,35 dw,,; h 9,,; 1,75 dw r ~ 9 0,525 dw y hg J w p Fig. 4 arc of support. depth of fairlead groove. radius of fairlead grove. nominal wire diameter. pitch diameter. p d,. 16 w Wire f airlead diameter I groove. Pt. 4 Ch. 2 Sec. 6 Page 39 Item C 300 should read: C 300 Electric motors and start transformers, protection by enclosures. 301 Electric motors and start transformers for thruster drive may have enclosure IP 22 provided that: dw Pt. 4 Ch. 3 Sec. 4 Page 8 In item C 404 re. conical shells. the last passages should read as follows: The thickness of the junction or knuckle and the adjacent parts shall not be less than that for the cone determined by the formula in 401. The thickness of the knuckle of junction shall be at least 0, (This requirements does not apply to large diameter tanks with moderate design pressures, e.g. cement/ mud tanks). If the difference in angle of slope exceeds 30, welded junctions are not permitted. In these cases knuckle connections with a minimum inside radius ri of 0,06 D 0 are to be applied. Pt. 6 Ch. 2 Sec. 1 Page I Item B should read as follows: B 100 B. Documentation. Plans, particulars and certificates. 101 Plans, particulars and certificates for the mooring equipment as specified in Pt.3 Ch.2 Sec.5 A 300 and where applicable, are to be submitted for approval/ documentation. 102 In addition to l 0 I the following is to be submitted for approval: Windlass/winch and stopper design. Anchor design including anchor weight and anchor size. Material specification. Anchor line type including total line length and dimension. Material specification. 103 In addition to I 0 I the following is to be submitted for documentation:, Windlass/winch lifting capacity and static and dynamic braking capacity. Strength calculation of main components of windlass/winch, i.e. cable lifter/ drum, couplings, shafts, brakes, gear and frame base. - Strength calculation of full scale anchor unless type approval of the anchor has been given. - Environmental loads and wave induced motions of the vessel in all design conditions. - Horizontal restoring forces and maximum line tension as function of displacements in all design conditions. Motion of the vessel (including transient motion) and new equilibrium position for design condition DO, see Sec. 3 B. Anchor pattern used in mooring system analysis Maximum and minimum design water depth. The characteristics of the thrust control system, see Sec. 3 D For the following items Det norske Veritas' material certificate will be required: Steel wire rope. - Wire end attachment.

14 Mobile Offshore Units, Introduction 12 Pt. 6 Ch. 5 Sec. 4 Page 11 Item C 103 should read: 103 For piping not covered by the applied recognized codes or standards a combined stress calculation may be used. Thus the equivalent combined stress according to van Mises' Theory is in no point of the piping wall to exceed 60% of the minimum specified yield strength of the piping material. Applicable allowances are to be added to the strength thickness to compensate for thickness reductions. Page 12 Item D 102 should read as follows: 102 If necessiated by the relation between reference thickness and minimum design temperature, impact testing should be carried out for piping of the following types of steels: 3,5% Ni-steels or 5% Ni-steels, C, C-Mn fine grain, C-Mo and C-Mn-Mo steels. Guidance: Impact testing is recommended for reference thickness above 6 mm if the MDT is below minus l0 C. Impact testing will normally be required for reference thickness above 26 mm (approx. one inch) if the MDT is below 10 C. ' Pt. 6 Ch. 5 Sec. 9 Page 21 Subsection C should read as follows: C. Fire Fighting. e 100 General. 101 In addition to the fire pump capacity required according to Pt. 4 Ch. 1 Sec. 8 there shall be sufficient fire pump capacity to supply water for the following. 102 A water protection system is to be installed to cover the following areas and equipment at a minimum rate of 12,21/min m" - Drill floor/workover areas. - Areas containing equipment (including piping) through which petroleum is followed during well test operations. - Wellhead areas (for production installation) - Processing areas (for production installations) 103 (N) The following requirement in 104 (N) to 105 (N) do only apply to production installations. 104 (N) The water protection system mentioned below and in 102 above shall be automatically operated. For wellhead areas the capacity is to be at least 20 I/min m'. In addition to the areas mentioned in 102, the following areas shall be covered, with minimum capacity of 1 O I/min m 2 : - Areas for circulation and treatment of drilling fluid. - Surface of pressure vessels and tanks containing combustables. I 105 (N) At least two water monitors are to be installed \. to cover the drilling and processing areas. These monitors shall each have a minimum capacity of 100 m 3 /hr at a discharge pressure of 3,5 bar. They shall have a fixed arrangement making it possible, by a simple hand-grip, to disperse the water jet. The location of the water monitors is to be in easily accessible places and not on the sa- ( me side of the area they shall cover. The monitors shall be made for easy and quick operation. 106 (N)At least four 12 kg dry powder extinguishers shall be distributed in the drill tloor/workover areas. 107 If the water protection system, which is to be designed, manufactured, installed and tested to the satisfaction of the Society, may be automatically operated, the system shall be provided with a manual override function. 108 All fire fighting equipment must be protected against freezing to the extent necessary.

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