1、Designation:D218605(Reapproved 2009)Standard Test Methods forDeposit-Forming Impurities in Steam1This standard is issued under the fixed designation D2186;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the determination of theamount of deposit-forming impurities in steam.Determinationsare made on condensed steam samp
3、les in all test methods.TestMethods A,B,and C give a measure of the amount of totaldeposit-forming material present;Test Method D deals withspecial constituents that may be present.Special precautionsand equipment,calculation procedures,and ranges of applica-bility are described.The following test m
4、ethods are included:SectionsTest Method A(Gravimetric or Evaporative)6 to 12Test Method B(Electrical Conductivity)13 to 19Test Method C(Sodium Tracer)20 to 26Test Method D(Silica and Metals)27 to 301.2 Test Method A is applicable for determining totaldissolved and suspended solids in concentrations
5、normally notless than 0.4 mg/L(ppm).It is applicable only to long-timesteady-state conditions and is not applicable for transients.1.3 Test Method B will measure minimum impurity concen-trations varying from 3 mg/L(ppm)down to at least 0.005mg/L(ppm),depending on the means for removing dissolvedgase
6、s from the steam condensate.The means for removingdissolved gases also affects the storage capacity of steamcondensate in the system and,thus,affects the response of thesystem to transients.1.4 Because of the high sensitivity of methods for measur-ing sodium in steam condensate,Test Method C provide
7、s themost sensitive measure of impurity content for samples inwhich sodium is an appreciable percentage of the impuritiespresent.Concentrations as low as 4.0 g/L(ppb)can bedetected by inductively coupled plasma atomic emissionspectroscopy,0.2g/L(ppb)byatomicabsorptionspectrophotometry,0.1 g/L(ppb)by
8、 graphite furnace atomicabsorption spectroscopy,and as low as 0.5 g/L(ppb)bysodium ion electrode.The apparatus can be designed with lowvolume,and,therefore,Test Method C is the most responsiveto transient conditions.1.5 Test Method D covers the determination of silica andmetals in steam,which are no
9、t included in Test Methods B andC and are not individually determined using Test Method A.1.6 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and deter
10、mine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D512 Test Methods for Chloride Ion In WaterD516 Test Method for Sulfate Ion in WaterD857 Test Method for Aluminum in WaterD859 Test Method for Silica in WaterD1066 Practice for Sampling SteamD1068
11、Test Methods for Iron in WaterD1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1129 Terminology Relating to WaterD1687 Test Methods for Chromium in WaterD1688 Test Methods for Copper in WaterD1886 Test Methods for Nickel in WaterD1976 Test Method for Elements in Water by Indu
12、ctively-Coupled Argon Plasma Atomic Emission SpectroscopyD2791 Test Method for On-line Determination of Sodium inWaterD3082 Test Method for Boron in WaterD3370 Practices for Sampling Water from Closed ConduitsD3867 Test Methods for Nitrite-Nitrate in WaterD4191 Test Method for Sodium in Water byAtom
13、icAbsorp-tion SpectrophotometryD5542 Test Methods for Trace Anions in High Purity Waterby Ion ChromatographyD5907 Test Methods for Filterable Matter(Total DissolvedSolids)and Nonfilterable Matter(Total Suspended Solids)in WaterD6071 Test Method for Low Level Sodium in High Purity1These test methods
14、are under the jurisdiction of ASTM Committee D19 onWater and are the direct responsibility of Subcommittee D19.03 on Sampling Waterand Water-Formed Deposits,Analysis of Water for Power Generation and ProcessUse,On-Line Water Analysis,and Surveillance of Water.Current edition approved May 1,2009.Publ
15、ished June 2009.Originallyapproved in 1966.Last previous edition approved in 2005 as D2186 05.DOI:10.1520/D2186-05R09.2For 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
16、 standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesNOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information1Water by Graphite Furnace Atomic Absorption Spectros-copy3.Terminology3.1 DefinitionsFor definitions of terms used in these testmethods,refer to Terminology D1129.4.Significance and