ASTM_D_3370_-_18.pdf

Designation:D337018Standard Practices forSampling Water from Flowing Process Streams1This standard is issued under the fixed designation D3370;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 U.S.Department of Defense.1.Scope1.1 These practices cover the equipment and methods forsampling water from closed conduits such as process streams atpower stations for chemical,physical,microbiological,andradiological analyses.It does not cover specialized equipmentrequired for and unique to a specific test or method of analysis.The following are included:SectionsPractice AGrab Samples9 17Practice BComposite Samples18 23Practice COn-Line Sampling24 291.2 For information on specialized sampling equipment,tests or methods of analysis,reference should be made toVolumes 11.01 and 11.02 of the Annual Book of ASTMStandards,relating to water.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazards statements,see 8.3 and 13.4.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A106/A106M Specification for Seamless Carbon Steel Pipefor High-Temperature ServiceA179/A179M Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser TubesA269 Specification for Seamless and Welded AusteniticStainless Steel Tubing for General ServiceA335/A335M Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature ServiceD1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD3648 Practices for the Measurement of RadioactivityD3694 Practices for Preparation of Sample Containers andfor Preservation of Organic ConstituentsD3856 Guide for Management Systems in LaboratoriesEngaged in Analysis of WaterD4453 Practice for Handling of High Purity Water SamplesD4840 Guide for Sample Chain-of-Custody ProceduresD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5540 Practice for Flow Control and Temperature Controlfor On-Line Water Sampling and Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 back-pressure regulator,na device designed tomaintain a constant pressure upstream of itself(variable orfixed back pressure regulators are available)to maintainconstant flow in analyzers in on-line sampling.3.2.1.1 DiscussionContemporarydesignsofback-pressure regulators provide excellent sensitivity to pressure1These practices are under the jurisdiction of ASTM Committee D19 on Waterand are the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Water Analysis,and Surveillance of WaterCurrent edition approved Dec.15,2018.Published January 2019.Originallyapproved in 1974.Last previous edition approved in 2010 as D3370 10.DOI:10.1520/D3370-18.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 variations.They require less space,have fewer maintenanceproblems,and reduce sample-contamination potential.3.2.2 composite sample,na series of grab samples inte-grated into a single sample or a sample collected at specifictime intervals and integrated into a single sample.3.2.2.1 DiscussionThe goal of a composite sample is tocharacterize a process-weighte