ASTM_G_170_-_06_2012.pdf

Designation:G17006(Reapproved 2012)Standard Guide forEvaluating and Qualifying Oilfield and Refinery CorrosionInhibitors in the Laboratory1This standard is issued under the fixed designation G170;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.1.Scope1.1 This guide covers some generally accepted laboratorymethodologies that are used for evaluating corrosion inhibitorsfor oilfield and refinery applications in well defined flowconditions.1.2 This guide does not cover detailed calculations andmethods,but rather covers a range of approaches which havefound application in inhibitor evaluation.1.3 Only those methodologies that have found wide accep-tance in inhibitor evaluation are considered in this guide.1.4 This guide is intended to assist in the selection ofmethodologies that can be used for evaluating corrosioninhibitors.1.5 This standard does not purport to address all of thesafety concerns,if any,associated 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 ASTM Standards:2D1141 Practice for the Preparation of Substitute OceanWaterD4410 Terminology for Fluvial SedimentG1 Practice for Preparing,Cleaning,and Evaluating Corro-sion Test SpecimensG3 Practice for Conventions Applicable to ElectrochemicalMeasurements in Corrosion TestingG5 Reference Test Method for Making Potentiostatic andPotentiodynamic Anodic Polarization MeasurementsG15 Terminology Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G16 Guide for Applying Statistics to Analysis of CorrosionDataG31 Guide for Laboratory Immersion Corrosion Testing ofMetalsG46 Guide for Examination and Evaluation of Pitting Cor-rosionG59 Test Method for Conducting Potentiodynamic Polariza-tion Resistance MeasurementsG96 Guide for Online Monitoring of Corrosion in PlantEquipment(Electrical and Electrochemical Methods)G102 Practice for Calculation of Corrosion Rates and Re-lated Information from Electrochemical MeasurementsG106 Practice for Verification of Algorithm and Equipmentfor Electrochemical Impedance MeasurementsG111 Guide for Corrosion Tests in High Temperature orHigh Pressure Environment,or Both2.2 NACE Standards:4NACE-5A195 State-of-the-Art Report on Controlled-FlowLaboratory Corrosion Test,Houston,TX,NACE Interna-tional Publication,Item No.24187,December 1995NACE-ID196 Laboratory Test Methods for Evaluating Oil-Field Corrosion Inhibitors,Houston,TX,NACE Interna-tional Publication,Item No.24192,December 1996NACE-TM0196 Standard Test Method“Chemical Resis-tance of Polymeric Materials by Periodic Evaluation,”Houston,TX,NACE International Publication,Item No.21226,19962.3 ISO Standards:5ISO 696 Surface Active Agents Measurements of Foam-ing Power Modified Ross-Miles MethodISO 6614 Petroleum Products Determination of WaterSeparability of Petroleum Oils and Synthetic Fluids3.Terminology3.1 Definitions of Terms Specific to This Standard:1This guide is under the jurisdiction of ASTM Committee G01 on Corrosion ofMetals and is the direct responsibility of Subcommittee G01.05 on LaboratoryCorrosion Tests.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 2001.Last previous edition approved in 2006 as G170 06.DOI:10.1520/G0170-06R12.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Association of Corrosion Engineers(NACE),1440South Creek Dr.,Houston,TX 77084-4906,http:/www.nace.org.5Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 atmospheric pressure experimentan experiment con-ducted at the ambient atmospheric pressure(typically less than0.07 MPa(10 psig),using normal laboratory glassware.3.1.2 batch inhibitoran inhibitor that forms a film on themetal surface that persists to effect inhibition.3.1.3 batch treatmenta method of applying a batch inhibi-tor.Batch inhibitors are applied as a plug between pigs or asslugs of chemical poured down the well bore.The batchinhibitor is dissolved or dispersed in a medium,usuallyhydrocarbon and the inhibited solution is allowed to be incontact with the surface that is to be protected for a fixedamount of time.During this period,the inhibitor film is formedon the surface and protects the surface during the passa