1、 Specification for Rotary Drill Stem Elements API SPECIFICATION 7FORTIETH EDITION,NOVEMBER 2001EFFECTIVE DATE:MARCH 2002COPYRIGHT 2003;American Petroleum Institute COPYRIGHT 2003;American Petroleum Institute Specification for Rotary Drill Stem Elements Upstream Segment API SPECIFICATION 7FORTIETH ED
2、ITION,NOVEMBER 2001EFFECTIVE DATE:MARCH 2002COPYRIGHT 2003;American Petroleum Institute SPECIAL NOTES API publications necessarily address problems of a general nature.With respect to partic-ular circumstances,local,state,and federal laws and regulations should be reviewed.API is not undertaking to
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6、east everyve years.Sometimes a one-time extension of up to two years will be added to this reviewcycle.This publication will no longer be in effect ve years after its publication date as anoperative API standard or,where an extension has been granted,upon republication.Statusof the publication can b
7、e ascertained from the API Upstream Segment telephone(202)682-8000.A catalog of API publications and materials is published annually and updated quar-terly by API,1220 L Street,N.W.,Washington,D.C.20005.This document was produced under API standardization procedures that ensure appropri-ate noticati
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13、ct the Publisher,API Publishing Services,1220 L Street,N.W.,Washington,D.C.20005.Copyright 2001 American Petroleum InstituteCOPYRIGHT 2003;American Petroleum Institute iii FOREWORD This specication is under the jurisdiction of the API Subcommittee on Drill Stem Ele-ments and Compounds.American Petro
14、leum Institute(API)specications are published as aids to the procure-ment of standardized equipment and materials,as well as instructions to manufacturers ofequipment or materials covered by an API specication.These specications are notintended to obviate the need for sound engineering,nor to inhibi
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