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15、C 20001.Requests for permission to reproduce ortranslate all or any part of the material published herein should also be addressed to the director.Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every five years.A one-timeextension of up to two years may be added to
16、 this review cycle.Status of the publication can be ascertained from theAPI Standards Department,telephone(202)682-8000.A catalog of API publications and materials is publishedannually by API,200 Massachusetts Avenue,Suite 1100,Washington,DC 20001.Suggested revisions are invited and should be submitted to the Standards Department,API,200 MassachusettsAvenue,Suite 1100,Washington,DC 20001,standardsapi.org.iiiContentsPage1Scope.12Normative References .43Definitions and Abbreviations.43.1Terms and