FEBRUARY 2021 CLASSIFICATION OF DRILLING SYSTEMS
GUIDE FOR THECLASSIFICATION OF DRILLING SYSTEMSFEBRUARY 2021American Bureau of ShippingIncorporated by Act of Legislature ofthe State of New York 1862 2021 American Bureau of Shipping. All rights reserved.1701 City Plaza DriveSpring, TX 77389 USA
Foreword (1 February 2021)This Guide describes criteria to be used for drilling systems, which are approved by the American Bureauof Shipping (ABS) and built to requirements of recognized codes and standards.This Guide is to be used in conjunction with other applicable ABS Rules and Guides, codes and standardsas referenced therein, and applicable national regulations.ABS Classification continues to provide the offshore industry with a pathway toward agreement withRegulatory Authorities. Any Owner/Operator’s specific request for compliance with applicablerequirements of flag or Coastal State Authorities affecting the drilling systems is to be filed as anaddendum to the Request for Classification.The first edition of the CDS Guide was published in 1986 to support the drilling regulations developed forrigs operating in the UK sector of the North Sea. As part of ABS’s commitment to promoting the securityof life and property and preserving the natural environment, ABS has endeavored to continuously updatethe Guide by applying the latest industry standards and trends in risk abatement.The July 2020 edition of the Guide provides clarification on stock/spare equipment and components whennot installed on a drilling unit and gives a process to incorporating them into the drilling unit. This updatealso provides clarification on maintenance and overhaul of equipment and components.The February 2021 edition of the Guide adds a requirement for technical review of the Riser Operations,Maintenance, and Inspection Manual. It also modifies 3-2/Table 3 to change Tier level from 5 to 4/5 for theAuxiliary Well Control Equipment [IBOP, Drill Pipe Safety Valves, Drill String Float Valves, Non-return(NR), Valves in Drill String (IBO)], thus allowing the product quality assurance (PQA) program.This Guide becomes effective on 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 ofthis Guide is the most current.We welcome your feedback. Comments or suggestions can be sent electronically by email torsd@eagle.org.ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 2021ii
GUIDE FOR THECLASSIFICATION OF DRILLING SYSTEMSCONTENTSCHAPTER 1Scope and Conditions of Classification. 1Section 1Classification.2Section 2Classification Symbols and Notations.3Section 3Rules for Classification. 5Section 4Plans and Design Data to be Submitted for Review.6Section 5Alternatives. 7Section 6Recognition of Risk Based Techniques to JustifyAlternatives and Novel Features .8Section 7Definitions. 11Section 8Acronyms and Abbreviations. 26CHAPTER 2Drilling Systems.29Section 1General. 33Section 2Design Specifications. 36Section 3Well Control Systems (WCS).40Section 4Derrick Systems (DSD).57Section 5Drilling Fluid Conditioning Systems (DSC). 66Section 6Handling Systems (DSP) . 70Section 7Common Requirements for WCS, DSD, DSC, andDSP Notations. 77CHAPTER 3Scope of Drilling System and Equipment Approval. 85Section 1General. 86Section 2Approval Process.87CHAPTER 4Drilling System Piping.123Section 1General. 124Section 2Design Criteria. 125CHAPTER 5Materials for Drilling Systems and Equipment. 131Section 1General. 133Section 2Materials for Structural and Mechanical LoadBearing Components. 136Section 3Materials for Pressure-Retaining/Containing/Controlling Equipment and Piping Components. 139ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 2021iii
CHAPTER 6Section 4Section 5Material Manufacturing Considerations. 141Material Fabrication Considerations. 143Section 6Section 7Section 8Sealing (Metallic and Non-metallic) Materials.145Documentation and Traceability. 146Nondestructive Testing (NDE). 147Welding and Nondestructive Examination. 148General. 150Welding.151Post Weld Heat Treatment (PWHT) .153Nondestructive Examination (NDE). 154Extent of Nondestructive Examination on Welds.155Inspection for Delayed (Hydrogen-Induced) Cracking.157NDT Methods and Acceptance Criteria. 158Record Retention.160Section 1Section 2Section 3Section 4Section 5Section 6Section 7Section 8CHAPTER 7CHAPTER 8Surveys at Vendor's Plant During Installation andCommissioning. 161Section 1General. 162Section 2Surveys at Manufacture and During Assembly.163Section 3Onboard Surveys During Installation. 169Section 4Commissioning Surveys of the Drilling Systems. 172Surveys After Construction and Maintenance of Class. 174General. 175Surveys Onshore and Issuance of MaintenanceRelease Notes. 178Section 3Survey of Drilling Systems.180Section 4Alternatives to Periodical Survey. 184Section 5Modifications, Damage and Repairs.185Section 1Section 2APPENDIX 1Typical Codes and Standards Related to ABS Classificationof Drilling Systems. 186Section 1Typical Codes and Standards Related to ABSClassification of Drilling Systems.187APPENDIX 2Typical Example of Manufacturer's Affidavit of Compliance(MAC). 192Section 1Typical Example of Manufacturer’s Affidavit ofCompliance (MAC). 193APPENDIX 3Typical Example of Independent Review Certificate (IRC).195Section 1Typical Example of Independent Review Certificate(IRC) . 196ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 2021iv
APPENDIX 4Example of Certificate of Conformity (CoC).199Example of Certificate of Conformity (CoC).200Section 1APPENDIX 5Example of Survey Report (SR).202Section 1Example of Survey Report (SR) . 203APPENDIX 6Example Maintenance Release Note (MRN). 205Section 1Example Maintenance Release Note (MRN).206APPENDIX 7Design Plans and Data - Submittal Requirements.207Section 1Design Plans and Data. 208Section 2Manufacturing Specifications.225APPENDIX 8Certification of Existing Drill-Through Equipment. 226Certification of Existing Drill-Through Equipment. 227Section 1ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 2021v
CHAPTER1Scope and Conditions of ION2Classification Symbols and Notations.31ABS Class Notation. 33Sub Class Notations. 35Systems Not Built Under Survey . 47Managed Pressure Drilling (MPD) Systems . 4FIGURE 1Notations Application. 4SECTION3Rules for Classification. 51General. 53Application . 5SECTION4Plans and Design Data to be Submitted for Review.61Submission of Plans. 6SECTION5Alternatives. 71General. 73National Standards. 75New Technologies and Novel Concepts. 7SECTION6Recognition of Risk Based Techniques to Justify Alternativesand Novel Features .81General. 83Application. 85Other Requirements. 10SECTION7Definitions.11SECTION8Acronyms and Abbreviations. 26ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20211
CHAPTER1Scope and Conditions of ClassificationSECTION1ClassificationThe requirements for conditions of classification are contained in the separate, generic ABS Rules forConditions of Classification – Offshore Units and Structures (Part 1). Additional requirements specific todrilling systems are contained in this Chapter.ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20212
CHAPTER1Scope and Conditions of ClassificationSECTION2Classification Symbols and Notations1ABS Class NotationDrilling systems, related subsystems, equipment, and/or components that have been built, installed andcommissioned to the satisfaction of the Surveyors to the full requirements of this Guide, where approvedby the Committee for service for the specified design environmental conditions, may be classed anddistinguished in the ABS Record by the notation CDS. For new construction or for existing systemsbeing brought in CDS class, the full requirements of this Guide apply.3Sub Class Notations (1 October 2019)Upon completion of 1-2/1 above and at the Owner’s request, CDS can be limited in scope. Followingcompletion of the requirements to change the class scope, the existing CDS may be exchanged for oneor more of the following sub-class designations (See also 1-2/Figure 1): CDS(WCS) applies to the classification of the well control system including well controlequipment and associated control systems CDS(DSD) applies to the classification of the derrick systems including drawworks, hoisting anddrilling and motion compensating systems and associated control systems CDS(DSC) applies to the classification of the drilling fluid circulating system and associatedcontrol systems CDS(DSP) applies to the classification of the specialized pipe and tubular handling systems andassociated control systemsNote: CDS(WCS DSD) class designation would apply where the Well Control and Derrick systems were classed and CDS(DSC) and CDS(DSP) were not selected.ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20213
ChapterSection12Scope and Conditions of ClassificationClassification Symbols and Notations1-2FIGURE 1Notations Application5Systems Not Built Under SurveyThe symbol " " (Maltese-Cross) signifies that the drilling system, subsystems, equipment, and/orcomponents were built, installed and commissioned to the satisfaction of the Surveyors. Drilling systems,subsystems, equipment, and/or components that have not been built under ABS survey, but which aresubmitted for Classification, will be subjected to special consideration. Where found satisfactory andthereafter approved by the Committee, they may be classed and distinguished in the Record by the notationdescribed above, but the symbol " " signifying survey during construction will be omitted.A listing of Classification Symbols and Notations available to the Owners of vessels, offshore drilling andproduction units and other marine structures and systems, "List of ABS Notations and Symbols" isavailable from the ABS website "http://www.eagle.org".7Managed Pressure Drilling (MPD) SystemsFor managed pressure drilling (MPD) systems and associated optional notations refer to the ABS Guide forClassification and Certification of Managed Pressure Drilling Systems.ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20214
CHAPTER1Scope and Conditions of ClassificationSECTION3Rules for Classification1GeneralThis Guide is applicable to optional classification of drilling systems and associated equipment used toconstruct wells or support such activities on mobile offshore drilling units, offshore installations, tenderingvessels and other units that are classed with ABS. This Guide is intended for use in conjunction with the ABS Rules for Building and Classing Mobile Offshore Units (MOU Rules) ABS Rules for Building and Classing Offshore Installations (Offshore Installations/FOI Rules) ABS Rules for Building and Classing Floating Production Installations (FPI Rules) ABS Rules for Building and Classing Marine Vessel (Marine Vessel Rules) ABS Rules for Building and Classing Facilities on Offshore Installations (Facilities Rules) or other applicable ABS Rules and Guides.If requested by the Owner, this Guide can also be used as a basis for acceptance or certification under therequirements of other Administrations. An Owner who requires a drilling system to be evaluated forcompliance with other national regulations should contact ABS.If requested by the manufacturers, Owner, or designers, ABS can provide approval of individual equipmentor component associated with drilling systems or subsystems in accordance with the requirements of thisGuide where the installation unit may not be classed with ABS.3ApplicationApplication of the Rules and Guides is, in general, based on the contract date for construction between theshipbuilder and the prospective owner. (e.g., Rules which became effective on 1 January 2017 are notapplicable to a drilling unit for which the contract for construction was signed on 30 June 2016.) See also1-1-4/3 of the ABS Rules for Conditions of Classification – Offshore Units and Structures (Part 1). Forapplication of codes and standards, see 2-2/1.1 of this Guide.ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20215
CHAPTER1Scope and Conditions of ClassificationSECTION4Plans and Design Data to be Submitted forReview1Submission of PlansTypical documentation that is required to be submitted for review for drilling systems, subsystems,equipment, and/or components for the ABS Classification process is provided in Appendix 7 of this Guide.The ABS approval process for drilling systems, subsystems, equipment, and/or components is provided inChapter 3, Section 2. Subsequently, 3-2/Tables 1 through 10 identify the typical drilling systems,subsystems, equipment, and/or components that are part of the ABS Classification process.Drilling systems, subsystems, equipment and/or component-related drawings, calculations anddocumentation are required to be submitted to ABS for review by the contracting party or the partyassigned by the contracting party to substantiate that the design of the systems, subsystems, equipmentand/or components are in compliance with this Guide and applicable codes or standards as listed in thisGuide.Upon satisfactory completion of ABS review of the submitted design plans and data, ABS will issue anapproval letter and/or an Independent Review Certificate (IRC), as specified in 3-2/7.1. This letter orcertificate, in conjunction with ABS-approved documentation, will be used and referenced during surveys.Subsequently, the Surveyor will issue appropriate survey reports and Certificate of Conformity (COC) asspecified in 3-2/7.1.Upon satisfactory completion of all of the required engineering design review and survey processes(inspection, testing, installation and commissioning), ABS may issue the Classification Certificate to theoperating unit, including the Class notation CDS (abbreviation for Classed Drilling System).ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20216
CHAPTER1Scope and Conditions of ClassificationSECTION5Alternatives1GeneralThe Committee is willing to consider alternative arrangements and designs which can be shown, througheither satisfactory service experience or a systematic analysis based on sound engineering principles, tomeet the overall safety, serviceability and design standards of the applicable Rules and Guides.3National StandardsThe Committee will consider special arrangements or design of drilling systems and their equipment whichcan be shown to comply with standards recognized in the country provided that the proposed standards arenot less effective.When alternate standards are proposed, comparative analyses are to be provided to demonstrate equivalentlevel of safety to the recognized standards as listed in this Guide and to be performed in accordance withthis Chapter.5New Technologies and Novel ConceptsDrilling systems which involve new technologies or contain novel design features to which the provisionsof this Guide are not directly applicable may be classed, when approved by the Committee, on the basisthat this Guide, insofar as applicable, has been complied with and that special consideration has been givento these aspects, based on the best information available at that time. The ABS Guidance Notes onQualifying New Technologies and the ABS Guidance Notes on Review and Approval of Novel Conceptsprovide a methodology for approval of such designs and their incorporation on an asset.ABS GUIDE FOR THE CLASSIFICATION OF DRILLING SYSTEMS 20217
CHAPTER1Scope and Conditions of Classificat
1 Scope and Conditions of Classification. S E C T I O N. 1 Classification. The requirements for conditions of classification are contained in the separate, generic ABS Rules for Conditions of Classification – Offshore Units and Structures (Part
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