1、Designation:F244604(Reapproved 2010)An American National StandardStandard Classification forHierarchy of Equipment Identifiers and Boundaries forReliability,Availability,and Maintainability(RAM)Performance Data Exchange1This standard is issued under the fixed designation F2446;the number immediately
2、 following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This classificatio
3、n is to serve as an international stan-dard for marine equipment nomenclature,taxonomy,hierarchi-cal data structure,unique identifiers,and boundary definitionfor the consistent acquisition and exchange of equipment RAMperformance data.The standard addresses the classification ofmechanical and softwa
4、re products.1.2 RAM in an acronym for Reliability,Availability,&Maintainability where:1.2.1 Reliability is the probability that an item can performa required function under given conditions for a given timeinterval(t1,t2).It is generally assumed that the item is in astate to perform this required fu
5、nction at the beginning of thetime interval.1.2.2 Availability is the probability that an item is in a stateto perform a required function under given conditions at agiven instant of time,assuming that the required externalresources are provided.1.2.3 Maintainability is the probability that a given
6、activemaintenance action,for an item under given conditions of usecan be carried out within a stated time interval,when themaintenance is performed under stated conditions and usingstated procedures and resources.1.3 This standard does not purport to address all of thesafety concerns,if any,associat
7、ed with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ISO Standards:2ISO 3166-1:1997,Codes for the Representation of Namesof Countri
8、es and Their SubdivisionsPart 1:CountryCodes,1997ISO10303,IndustrialAutomationSystemsandIntegrationProduct Data Representation and ExchangeISO13584,IndustrialAutomationSystemsandIntegrationParts LibraryISO/IECTR12182,InformationTechnologyCategorization of Software,Technical Report,1998ISO/TC 67/WG 4
9、,ISO/FDIS 14224:1998(E),Petroleumand Natural Gas IndustriesCollection and Exchange ofReliability and Maintenance Data for Equipment,19982.2 Other Standards:Center for Chemical Process Safety of theAmerican Instituteof Chemical Engineers,Guidelines for Improving PlantReliability through Data Collecti
10、on and Analysis,19983IEC 60050-191,International Electrotechnical Vocabulary,Chapter 191,Dependability and Quality of Service4International Maritime Organization(IMO)Circular letterNo.1886/Rev.2,ImplementationofResolutionA.600(15)IMO Ship Identification Number Scheme,20025Naval Sea Systems Command,E
11、xpanded Ship Work Break-down Structure(ESWBS)for All Ships and Ship/Combat1This classification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.05 onComputer Applications.Current edition approved May 1,2010.Published J
12、une 2010.Originallyapproved in 2004.Last previous edition approved in 2004 as F2446-04.DOI:10.1520/F2446-04R10.2Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.3Available from American Institute o
13、f Chemical Engineers,3 Park Ave,NewYork,N.Y.10016-5991.4Available from International Electrotechnical Commission(IEC),3 rue deVaremb,Case postale 131,CH-1211,Geneva 20,Switzerland,http:/www.iec.ch.5Available from International Maritime Organization(IMO),4 AlbertEmbankment,London,SE1 7SR,U.K.Copyrigh
14、t ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Systems,Volumes 1 and 2,198563.Terminology3.1 Definitions:3.1.1 boundaryitem boundaries define the subordinatecomponents that are to be included in the item.The purpose ofthe boundary definition is
15、to ensure a common understandingof which components are to be included within a specific item.3.1.2 classa concept to group objects with similarcharacteristics,with the purpose of describing common prop-erties.3.1.2.1 DiscussionThe ISO 10303 definition of a class is“a concept to group items with sim
16、ilar characteristics,with thepurpose of describing the common properties of the classmembers.Each item belongs to at least one class.A classusually has a criterion for inclusion or exclusion of items.”Aclass is only an abstraction that helps the categorization ofobjects.3.1.3 instancethe physical representation of the memberof an object class.For example,the main propulsion dieselengine of vessel XYZ is an instance of the diesel_engine objectclass.3.1.4 objectany item that has properties and fun
