ASTM_D_3370_-_10.pdf

Designation:D337010Standard Practices forSampling Water from Closed Conduits1This 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 listed in parenthesis are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardsstatements,see 8.3 and 13.4.2.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 DefinitionsFor definitions used in these practices,refer to Terminology 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 pressurevaiations.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-weighted average in proportion to pro-cess parameters.3.2.3 grab sample,na single sample from a processstream(flowing)or from a source of confined-geometry(stagnant)withdrawn at a specific time.3.2.3.1 DiscussionThe goal of withdrawing a grab sample1These 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.1,2010.Published December 2010.Originallyapproved in 1974.Last previous edition approved in 2009 as D3370 09.DOI:10.1520/D3370-10.2For 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 States1 is to obtain a small portion of the process stream or confinedgeometry source in order to characterize the entire system.3.2.4 pressure reducer,na device designed to reducepressure,and therefore control flow,of sample to a pressurelevel where regulation is easily achieved.3.2.4.1 DiscussionThis device shall be located down-stream of the cooled sample where cooling is required.3.2.5 sample cooler,na small heat exchanger designed toprovide primary or secondary cooling,or both,of samplingstreams of water or steam.3.2.6 va