1、Specification for Drill String Non-return ValvesAPI SPECIFICATION 7NRV FIRST EDITION,JULY 10,2006 ADDENDUM 1,DECEMBER 2019REAFFIRMED,JULY 2020SPECIAL NOTESAPI publications necessarily address problems of a general nature.With respect to particular circumstances,local,state,and federal laws and regul
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9、100,Washington,DC 20001.Copyright 2006 American Petroleum InstituteFOREWORDNothing contained in any API publication is to be construed as granting any right,by impli-cation or otherwise,for the manufacture,sale,or use of any method,apparatus,or product covered by letters patent.Neither should anythi
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13、ay be added to this review cycle.Status of the publication can be ascertained from the API Standards Department,telephone(202)682-8000.A catalog of API publications and materials is published annually and updated quarterly by API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Suggested r
14、evisions are invited and should be submitted to the Standards and Publications Department,API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001,standardsapi.org.iiiCONTENTSPage1SCOPE.12NORMATIVE REFERENCES.23TERMS AND DEFINITIONS.24REQUIREMENTS.34.1 General.34.2 Design requirements.44.3 Fun
15、ctional considerations.44.4 Design considerations.44.5 Verification test.55MATERIALS.55.1 General.55.2 Metals.55.3 Non-metals.55.4 Traceability.66QUALITY CONTROL REQUIREMENTS.66.1 General.66.2 Documentation retention.66.3 Personnel qualifications.66.4 Calibration systems.66.5 Inspection of elastomer
16、ic materials.76.6 Dimensional inspection.76.7 Thread inspection.76.8 Welding and brazing.76.9 Qualification of heat treatment equipment.76.10 Coatings,overlays,and surface treatments.86.11 Mechanical and physical properties(where required by this Standard).86.12 NDE requirements.87TESTING.107.1 General.107.2 Verification testing.117.3 General requirements for an NRV verification test facility.117.4 NRV verification test procedure.117.5 NRV Nitrogen Pressure Test.127.6 NRV Hydro Pressure Test.127
