DNVGL-RP-D101 Structural Analysis Of Piping Systems

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RECOMMENDED PRACTICEDNVGL-RP-D101Edition July 2017Structural analysis of piping systemsThe electronic pdf version of this document, available free of chargefrom http://www.dnvgl.com, is the officially binding version.DNV GL AS

FOREWORDDNV GL recommended practices contain sound engineering practice and guidance. DNV GL AS July 2017Any comments may be sent by e-mail to rules@dnvgl.comThis service document has been prepared based on available knowledge, technology and/or information at the time of issuance of thisdocument. The use of this document by others than DNV GL is at the user's sole risk. DNV GL does not accept any liability or responsibilityfor loss or damages resulting from any use of this document.

GeneralThis document supersedes the October 2008 edition of DNV-RP-D101.The purpose of the revision of this service document is to comply with the new DNV GL document referencecode system and profile requirements following the merger between DNV and GL in 2013. Changes mainlyconsist of updated company name and references to other documents within the DNV GL portfolio.Some references in this service document may refer to documents in the DNV GL portfolio not yet published(planned published within 2017). In such cases please see the relevant legacy DNV or GL document.References to external documents (non-DNV GL) have not been updated.Changes Sec.3 Topside processing piping— [3.11.2.1]: The approach for estimating the blast drag pressure has been changed.Reference to DNVGL-OS-A101 Table-1 and DNVGL-OS-A101 Figure-1 have been added. Appendix J— Appendix J has been removed.Editorial correctionsIn addition to the above stated changes, editorial corrections may have been made.Recommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 3Changes - currentCHANGES – CURRENT

Changes – current. 3Section 1 General. 71.1 Introduction.71.2 Objective.71.3 Relationship to other codes. 71.4 References. 71.5 Definitions.101.6 Abbreviations and symbols. 11Section 2 Structural Analysis of Piping Systems. 142.1 Introduction. 142.2 Pipe stress and flexibility analysis.142.3 Analysis tools.172.4 Piping design codes. 18Section 3 Topside process piping. 213.1 General. 213.2 Commonly used design codes. 213.3 Type of calculations. 213.4 Loads to be considered in piping design. 213.5 Wall thickness calculations. 233.6 Flexibility calculations. 243.7 Equipment nozzle load calculations. 243.8 Flange calculations. 263.9 Pressure relief- and discharge force calculations.273.10 Expansion and slip-joint thrust load calculations. 283.11 Blast load calculations. 293.12 Fatigue calculations. 323.13 Non-standard component calculations. 343.14 Load case description- and combinations. 343.15 Pipe stress priority piping. 343.16 Design of pipe supports.363.17 Documentation of stress analysis. 383.18 Verification.40Section 4 Subsea piping. 414.1 General. 41Recommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 4ContentsCONTENTS

4.3 DNVGL-ST-F101 Submarine pipeline systems. 424.4 Recommended design cases. 424.5 Hydrogen induced stress cracking (HISC). 434.6 Documentation of pipe stress analysis. 444.7 Verification. 44Section 5 Non standard piping components. 455.1 General. 455.2 Requirements in piping codes.455.3 FEA design and qualification of non-standard pipingcomponents. 46Section 6 Verification. 516.1 General. 516.2 Self check. 516.3 Internal verification. 516.4 Verification carried out by a 3rd part. 51Appendix A Vortex induced vibrations. 54A.1 General. 54A.2 Relevance to piping. 54A.3 Scope. 54A.4 Important parameters. 54A.5 Vortex shedding frequency. 55A.6 Lock-in. 56A.7 In-line VIV.56A.8 Cross-flow VIV.56A.9 Reduced velocity, VR. 56A.10 Stability parameter, Ks. 56A.11 Effective mass, me. 57A.12 Added mass, ma. 57A.13 Limitation to added-mass equation. 57A.14 Common error in pipe stress software. 58A.15 Wind induced vortex shedding. 58A.16 Sea current induced vortex shedding. 58A.17 Recommended VIV check-out procedure. 59A.18 Methods used to reduce VIV. 60A.19 Physical properties of air and seawater.61Recommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 5Contents4.2 Commonly used design codes. 41

Appendix C Third party check list, global Analysis. 64Appendix D Check list, local FE-analysis. 66Appendix E Restraint symbols.68Appendix F Pipe stress isometric. 69Appendix G Load case combinations. 70Appendix H Subsea load case matrix. 71Appendix I Subsea pipe stress model. 73Changes – historic. 74Recommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 6ContentsAppendix B Analyst check list, global analysis.62

SECTION 1 GENERAL1.1 IntroductionThis recommended practice is based on, and intends to, show the best from European industrial practicefor structural analysis of piping systems intended for the offshore sector. Typical applications are oil andgas platforms, FPSOs, drilling units and subsea installations. Subsea installations are installations such astemplates, manifolds, riser-bases and subsea separation-and pump modules.There is no piping design code that fully covers these topics, and hence engineering companies havedeveloped a variety of internal design philosophies and procedures in order to meet the requirements tostructural integrity, safety, economical and functional design of piping systems.A number of references are given to below listed codes and standards from which equations for a largenumber of pipe-stress relevant calculations can be found.1.2 ObjectiveThe objective of this recommended practice is to describe a best practice for how structural analysis ofpiping systems can be performed in order to safeguard life, property and the environment. It should berduseful for piping structural engineers organising and carrying out the piping design, and any 3 partyinvolved in the design verification, such as classification societies, notified bodies etc. The proposedproject documentation should provide the operator with essential design information and be useful duringcommissioning, maintenance, future modifications, and useful in order to solve operational problems, if andwhen they occur.1.3 Relationship to other codesThis recommended practice is strongly related to the use of a large number of international design codes,standards, directives and regulations in order to succeed with a professional design.1.4 ReferencesThe below listed codes, standards, recommended practices, specifications and software are considered to bethe most important ones for analysis of piping systems and piping components to be installed in an offshoreenvironment.1.4.1 ASME codes and standardDocument codeTitleASME B16.5Pipe Flanges and Flange FittingsASME B16.9Factory Made Wrought Steel Butt welding FittingsASME B16.20Metallic Gaskets for Pipe Flanges-Ring Joint, Spiral Wound, and JacketedASME B16.28Non-metallic Flat Gaskets for Pipe FlangesASME B16.47Large Diameter Steel FlangesASME B16.49Factory Made Wrought Steel Butt welding Induction Bends for Transportation and DistributionSystemsASME B31.1Power PipingASME B31.3Process PipingRecommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 7

Document codeTitleASME B31.4Pipeline Transportation Systems for Liquid Hydrocarbons and Other LiquidsASME B31.8Gas Transmission and Distribution Piping SystemsASME B36.10MWelded and Seamless Wrought Steel PipeASME B36.19MStainless Steel PipeASME BPVC Sect. IIPart D Material PropertiesASME BPVC Sect. IIIRules for Nuclear Facility Components, Division 1ASME BPVC Sect. VIIIRules for Construction of Pressure Vessels, Division 1 & 21.4.2 API codes and standardsDocument codeTitleAPI 6ASpecification for Wellhead and Christmas tree EquipmentAPI 6AFCapabilities of API Flanges under Combination of LoadAPI RP 2A-WSDRecommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms Working Stress DesignAPI RP 2FBRecommended Practice for the Design of Offshore Facilities against Fire and Blast LoadingAPI RP 14ERecommended Practice for Design and Installation of Offshore Production Platform PipingSystemsAPI RP 17ADesign and Operation of Subsea Production Systems (API equivalent to ISO 13628)API RP 520Sizing, Selection and Installation of Pressure-relieving Devices in RefineriesAPI Std. 610Centrifugal Pumps for Petrochemical and Natural Gas IndustriesAPI Std. 611General-Purpose Steam Turbines for Petroleum, Chemical and Gas Industry ServicesAPI Std. 616Gas Turbines for Petroleum, Chemical, and Gas Industry ServicesAPI Std. 6171Axial and Centrifugal Compressors and Expander-compressors for Petroleum, Chemical andGas Industry Services1.4.3 Other standards and bulletinsDocument codeTitleAISC ASDAmerican Institute of Steel Construction, Allowable Stress DesignAISC LRFDAmerican Institute of Steel Construction, Load and Resistance Factor DesignEJMAThe EJMA Standards for design, installation and use of expansion bellowsNEMA SM23Steam Turbines for Mechanical Drive ServiceWRC 107WRC Bulletin No. 107. Local Stresses in Spherical & Cylindrical Shells due to ExternalLoadingsRecommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 8

Document codeTitleWRC 297WRC Bulletin No.297. Local Stresses in Cylindrical Shells Due to External Loadings onNozzles. Supplement to WRC Bulletin No. 107WRC 449Guidelines for the Design and Installation of Pump Piping Systems1.4.4 DNV GL offshore standardsDocument codeTitleDNVGL-ST-F101Submarine pipeline systems1.4.5 DNV GL recommended practicesDocument codeTitleDNVGL-RP-C203Fatigue strength analysis of offshore steel structuresDNVGL-RP-C205Environmental conditions and environmental loadsDNVGL-RP-F112Design of duplex stainless steel subsea equipment exposed to cathodic protection1.4.6 European codes and standardsDocument codeTitleBSI BS 7159Code of Practice for Design and Construction of Glass Reinforced Plastics (GRP) pipingsystems for Individual Plants or SitesEN-1591.1Flanges and their joints. Design rules for gasketed circular flange connections. CalculationmethodEN 1993Euro code 3, Design of Steel StructuresEN 13480Industrial Metallic PipingEN 13445Unfired Pressure VesselsEN-ISO-13628Design and operation of Subsea Production SystemsEN-ISO 13703Petroleum and Natural Gas Industries-Design and installation of Piping Systems on Offshoreproduction PlatformsEN-ISO- 14692Petroleum and Natural Gas Industries-Glass Reinforced Plastic Piping (GRP)PD 55001Specification for Unfired Fusion Welded Pressure VesselsPEDPressure Equipment Directive (97/23/EC)1.4.7 NORSOK standardsDocument codeTitleNORSOK L-001Piping and ValvesRecommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 9

Document codeTitleNORSOK L-002Piping Design, Layout and Stress AnalysisNORSOK L-005Compact Flanged ConnectionsNORSOK M-001Material SelectionNORSOK M-630Material Data Sheets for PipingNORSOK N-001Structural DesignNORSOK R-001Mechanical Equipment1.4.8 Other historical important piping publicationsPublisherTitleM.W. KelloggDesign of Piping SystemsRoark‘sFormulas for Stress and StrainCASTIPractical Guide to ASME B31.3MDTGuidelines for the Avoidance of Pipework FatigueCMRExplosion Handbook1.4.9 Pipe stress softwareSoftwareLicenceeAuto PipeBentley Systems, Exton, Pennsylvania, USACAE PipeSST Systems Inc. San Jose, California, USACaesar IIIntergraph CADWorx & Analysis Solutions, Inc, Houston, Texas, USAROHR2SIGMA Ingenieurgesellschaft mbH, Unna, GermanyTriflexPiping Solutions Inc. Houston, Texas, USA1.5 Definitions1.5.1 Definitions of verbal formsTermDefinitionshallindicated requirements strictly to be followed in order to conform to this RP and from whichno deviation is permittedshouldindicates that among several possibilities, one is recommended as particularly suitable,without mentioning or excluding others, or that a certain course of action is preferred but notnecessarily required. Other possibilities may be applied subject to agreementmayverbal form used to indicate a course of action permissible within the limits of the RPRecommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 10

TermDefinitionrecommendindicates the preferred method. Other suitable alternatives may be permitted subject toagreement1.6 Abbreviations and symbols1.6.1 AbbreviationsAbbreviationDescriptionAISCAmerican Institute of Steel ConstructionALSaccidental limit stateASDallowable stress designASMEAmerican Society of Mechanical EngineersASTMAmerican Society for Testing and MaterialsAPIAmerican Petroleum InstituteBPVCboiler and pressure vessel code (ASME code)CPcathodic protectionCTODcrack tip opening displacementDAFdynamic amplification factor (in the context of this RP the same as DLF)DFFdesign factor fatigueDLFdynamic load factorDFOdocumentation for operationsDNdiametre nominale (nominal outer diameter of a pipe [mm])DNV OSDNV offshore standardDNV OSSDNV offshore standard specificationDRWGdrawingEJMAExpansion Joint Manufacturers AssociationESDemergency shut downESDVemergency shut down valveFABIGFire and Blast Information GroupFEfinite elementFEAfinite element analysisFEMfinite element methodFLACSflame acceleration simulator (3D software used to simulate explosions)FLSfatigue limit stateRecommended practice — DNVGL-RP-D101. Edition July 2017Structural analysis of piping systemsDNV GL ASPage 11

AbbreviationDescriptionFPSOfloating production storage and offloading vesselGRPglass reinforced plasticsHAZheat affected zoneHDhold down (vertical restraint, resists pipe lift-off)HEhydrogen embrittlementHISChydrogen induced stress crackingHSEhealth safety and environment (discipline)HSEHealth & Safety Executive (body located in United Kingdom)ISOInternational Standards Organisation (also used for a piping standardised drawing)LRFDload and resistance factor designLGline guide (one or two directional restraint, perpendicular to pipe axis)LSline stop (restraint used to resist the axial movement of a pipe)MOUmobile offshore unitNEMANational Electrical Manufacturers Association (US)NDTnon-destructive testingNORSOKNorwegian Sector Offshore Standards (Norwegian abbreviation)NPSnominal pipe sizePEDPressure Equipment Directive (97/23/EC)PFPpassive fire protectionPNpressure nominale (pressure rating class for flanges and valves. [bar])PSpipe supportPWHTpost weld heat treatmentROVremotely operated vehicle (a subsea robot operated from a surface vessel, etc.)RPrecommended practiceRSrest support (vertical restraint that resist vertical movements caused by gravity)SCFstress concentration factorSDOFsingle degree of freedomSIFstress intensification factor (in ASM

ASME B31.8 Gas Transmission and Distribution Piping Systems ASME B36.10M Welded and Seamless Wrought Steel Pipe ASME B36.19M Stainless Steel Pipe ASME BPVC Sect. II Part D Material Properties ASME BPVC Sect. III Rules for Nuclear Facility Components, Division 1 ASME BPVC Sect. VIII Rules

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