AnalysisofSpreadMooringSystemsforFloatingDrillingUnitsAPIRECOMMENDEDPRACTICE2P(RP2P)SECONDEDITION,MAY1,1987AmericanPetroleumInstitute1220LStreet,Northwest'I)Washington,DC20005�IssuedbyAMERICANPETROLEUMINSTITUTEProductionDepartmentFORINFORMATIONCONCERNINGTECHNICALCONTENTSOFTHISPUBLICATIONCONTACTTHEAPIPRODUCTIONDEPARTMENT,211N.ERVAY,SUITE1700,DALLAS,TX75201(214}220-9111.SEEBACKSIDEFORINFORMATIONCONCERNINGHOWTOOBTAINADDITIONALCOPIESOFTHISPUBLICATION.UsersofthispublicationshouldbecomefamiliarwithItsscopeandcontent.Thispublicationisintendedtosupplementratherthanreplaceindividualengineeringjudgment.OFFICIALPUBLICATIONl]?REG.U.S.PATENTOFFICECopyright©1987AmericanPetroleumInstituteRP2P:AnalysisofSpreadMooringSystemsforFloatingDrillingUnits3ForewordThepurposeofthisdocumentistopresentarationalmethodforanalyzing,designingorevaluatingspreadmooringsystemsusedwithfloatingdrillingunits.Thismethodprovidesauniformanalysistoolwhich,whencombinedwithanunderstandingoftheenvironmentataparticularlocation,theseasonoftheyear,thecharacteristicsoftheunitbeingmoored,thetypeofholebeingdrilled,andotherfactors,canbeusedtodeterminetheadequacyandsafetyofthemooringsystem.Althoughportionsofthemethodmaybeusefulinanalyzingothertypesofmooringsystems,itsapplicationtothedesignofmooringsystemsforlaybarges,tankers,derrickbarges,dredges,etc.,islefttothediscretionoftheuser.Thetechnologyofmooringfloatingdrillingunitsiscontinuallyevolving.Thisprocedureisacompilationofthosefactorswhicharebestunderstoodandcanbequantifiedatthistime.Itisfeltthatthemethodencompassesmostofthemajorconsiderationsknownatthistime.Conversely,designersoranalystsshouldnotconstruethattheomissionofanyparticularphenomenon,calculationorotherconsiderationfromthisdocumentimpliesthatitmaynotbesignificantforaparticularsituation.Itisrecognizedthatdatacanbe,andis,appropriatelydevelopedfrommodeltests.Wind,wave,andcurrenttankdataareroutinelyusedindesignandanalysis.Theutilizationofdatafrommodeltestsisencouragedwhenitclearlyrepresentsaccurateinforma...
