ASTM_F_1332_-_99_2011.pdf

Designation:F133299(Reapproved 2011)An American National StandardStandard Practice forUse of SI(Metric)Units in Maritime Applications(CommitteeF25 Supplement to IEEE/ASTM SI 10)1This standard is issued under the fixed designation F1332;the number immediately 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.This standard has been approved for use by agencies of the Department of Defense.INTRODUCTIONThe International System of Units(SI)was developed by the General Conference on Weights andMeasures(CGPM),which is an international treaty organization.The abbreviation SI,derived fromthe French“Le Systme International dUnits,”is used in all languages.On Dec.23,1975,Public Law 94-168,“The Metric Conversion Act of 1975,”was signed byPresident Ford,committing the United States to a coordinated voluntary conversion to the metricsystem of measurement.The Act specifically defines the“metric system of measurement”as“theInternational System of Units as established by the General Conference on Weights and Measures in1960,and as interpreted or modified for the United States by the Secretary of Commerce.”On Aug.23,1988,President Reagan signed into law P.L.100-576,the Omnibus Trade andCompetitiveness Act of 1988.The Act specifies that“metric”means the modernized metric system(SI).The Act then amended the Metric Conversion Act of 1975 to designate the metric system ofmeasurement as the preferred system of weights and measures for United States trade and commerce.This practice will help obtain uniform SI practice in the marine industry by providing a technicalreference for the International System of Units(SI).The practice is not intended to cover all aspectsof SI usage,but to serve as a ready reference especially tailored to the operating needs of the industry.For further information on SI usage and conversion factors for units not found herein,refer toIEEE/ASTM SI-10,upon which this practice is based.In the event of a conflict,IEEE/ASTM SI-10shall take precedence.(See also NIST Special Publication 811.)Hardware and other standards in SIare currently being developed.1.Scope1.1 This practice covers the use of SI,which is comprised ofbase and derived SI units.Also discussed are non-SI units thathave been accepted and recognized by the CGPM as appropri-ate for limited use or time.Basic rules for style and usage of SIare set forth,as well as methods for conversion from non-SIunits to SI units.Tables of quantities used by the marineindustry are included,with present units and conversion factorsgiven.2.Referenced Documents2.1 ASTM Standards:2IEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units(SI):The Modernized Metric System2.2 NIST Publications:NIST Special Publication 811 Guide for the Use of theInternational System of Units(SI)3NIST Special Publication 330 The International System ofUnits(SI)31This practice is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.07 onGeneral Requirements.Current edition approved May 1,2011.Published May 2011.Originallyapproved in 1991.Last previous edition approved in 2005 as F1332 99(2005).DOI:10.1520/F1332-99R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 Definitions:3.1.1 quantity,nmeasurable attribute of a physical phe-nomenon.3.1.2 SI,nThe universally accepted abbreviation for theInternational System of Units as defined in the document LeSystme International dUnits,6th Edition,published by theInternational Bureau of Weights and Measures(BIPM),Sevres,France,1991,and as interpreted and modified for the UnitedStates by the U.S.Department of Commerce.The U.S.versionof the defining document is published by the National Instituteof Standards and Technology as NIST Special Publication330.43.1.3 unit,nreference value of a given quantity as definedby CGPM Resolution or ISO standards.There is only one unitfor each quantity in SI.3.2 Definitions of Terms Specific to This Standard:3.2.1 coherent system of unitsa system of units of mea-surement in which a small number of base units,defined asdimensionally independent,are used to derive all other units inthe system by rules of multiplication and division with nonumerical factors other than unity.4.The Concept of SI4.1 The International System of Units(SI)was developed toprovide a universal,coherent,a