ASTM_D_1192_-_98.pdf

Designation:D 1192 98Standard Guide forEquipment for Sampling Water and Steam in ClosedConduits1This standard is issued under the fixed designation D 1192;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide covers only that equipment commonly usedfor the sampling of water and steam in closed conduits.It doesnot cover specialized equipment required for and unique to aspecific test or method of analysis.Items such as valves,fittings,piping/tubing,cooling coils and condensers,filters,pumps,sample containers,and packaging materials are in-cluded,but items such as sampling nozzles that are used forobtaining steam or water samples from their source andapparatus used in subsequent methods of test and analysis areexcluded.1.2 For information on specialized sampling equipment ortests,or both,or methods of analysis,reference should be madeto the Annual Book of ASTM Standards relating to water.21.3 The following safety hazards caveat pertains only to thetest methods portion of this guide.This standard does notpurport to address all of the safety concerns,if any,associatedwith its use.It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.For specific safety precautions,see 4.2.2.2.Referenced Documents2.1 ASTM Standards:A106 Specification for Seamless Carbon Steel Pipe forHigh-Temperature Service3A179/A179M Specification for Seamless Cold-DrawnLow-Carbon Steel Heat-Exchanger and Condenser Tubes3A269 Specification for Seamless and Welded AusteniticStainless Steel Tubing for General Service3A335/A335M Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service3D1066 Practice for Sampling Steam4D1129 Terminology Relating to Water4D3370 Practices for Sampling Water from Closed Conduits4D3694 Practices for Preparation of Sample Containers andfor Preservation of Organic Constituents5D4453 Practice for Handling of Ultra-Pure Water Samples4D5540 Practice for Flow Control and Temperature Controlfor On-Line Water Sampling and Analysis43.Terminology3.1 DefinitionsFor definitions of terms used in this guide,see Terminology D 1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 sample coolersmall heat exchanger designed toprovide primary or secondary cooling,or both,of small processsampling streams of water or steam.3.2.2 pressure reducerdevice designed to reduce pressure,and therefore control flow,of cooled sample to a pressure levelwhere it can easily be regulated.3.2.3 back pressure regulatordevice designed to maintaina constant pressure upstream of itself(variable or fixed backpressure regulators are available)to maintain constant flow toanalyzers.3.2.4 head cupmethod used to achieve constant pressure(see back pressure regulator).It incorporates plumbing of thesample to a selected height above the inlet to the analyzer inletline(s)to achieve the required inlet pressure for the analyzers.It is occasionally used downstream of colorimetric analyzers inorder to increase sample flow past the analyzer.The sampleflows to an open cup with an overflow.This fixed headprovides the constant pressure,assuming inlet flow to the headcup exceeds outlet flow to the grab sample and analyzers.3.2.4.1 DiscussionContemporary designs of back pres-sure regulators provide excellent sensitivity to pressurechanges and have limited the need for head cups and theconcurrent space and maintenance problems as well as samplecontamination potential.3.2.5 variable rod in tube orificetype of pressure reducerthat uses a retractable tapered rod inside a reamed tube toprovide a variable orifice for pressure reduction that is parallelwith the sample flow.This eliminates wear of the orifice andprovides variable pressure reduction and flow.4.Materials and Manufacture4.1 Sample Lines:4.1.1 GeneralSample lines should be designed so that the1This guide is under the jurisdiction of ASTM Committee D-19 on Water and isthe direct responsibility of Subcommittee D19.03 on Sampling of Water andWater-Formed Deposits,Surveillance of Water,and Flow Measurement of Water.Current edition approved July 10,1998.Published November 1998.Originallypublished as D 1192 94.Last previous edition D 1192 95.2Annual Book of ASTM Standards,Vols 11.01 and 11.02.3Annual Book of ASTM Standards,Vol 01.01.4Annual Book of ASTM Standards,Vol 11.01.5Annual Book of ASTM Standards,Vol 11.02.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMsample is representative of the source.They shall be as short asfeasible and of the smallest practicable bore to facilitateflushing,minimize conditioning requirem