1、Designation:D348314Standard Test Methods forAccumulated Deposition in a Steam Generator Tube1This standard is issued under the fixed designation D3483;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、 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 theweight per unit area of waterside deposits on heat-transfersurfaces of steam generator tubes.The
3、 following test methodsare included:SectionsTest Method AMechanical removal byscraper or vibrating tool-removed depositweight method7 to 16Test Method BChemical removal by solvent-tube weight loss method17 to 27Test Method CMechanical removal by glass-bead blasting-tube weight loss method28 to 371.2
4、 Test Method A is a procedure generally applicable todeposits ranging from 1 to 100 g/ft2.The precision wasdetermined in the collaborative study over the range of 16 to 76g/ft2.This procedure allows the discretionary selection of thearea on the tube to be sampled.The removed deposit allows forfurthe
5、r chemical analysis.1.3 Test Method B is a procedure generally applicable todeposits ranging from 1 to 100 g/ft2.The precision wasdetermined in a collaborative study over the range of 28 to 73g/ft2.The procedure averages out the heavier and lighterdeposited areas.The solvent solution produced allows
6、 forfurther chemical analysis.1.4 Test Method C is a procedure generally applicable todeposits ranging from 1 to 100 g/ft2.The precision wasdetermined in a collaborative study over the range of 17 to 88g/ft2.The procedure averages out the heavier and lighterdeposited areas.The removed deposit does n
7、ot allow forfurther chemical analysis.1.5 These test methods have been generally evaluated on thetypes of waterside deposits generally found on heat-transfersurfaces of steam generator tubes.It is the users responsibilityto ensure the validity of these test methods for other types ofdeposits or high
8、 temperature scale.1.6 These methods are sometimes used for accumulateddeposition in rifled steam generator tubes.Experience hasshown that there is a significant difference in the deposition inthe grooves and on the lands on some rifled steam generatortubes.The grooves have been shown to hold more d
9、eposit.TestMethod B and Test Method C will average out this difference.In Method A the choice exists,either to choose to remove thedeposition from the groove if it is visually determined to bemore heavily deposited,or to remove equally over the groovesand lands.It is important that it be understood
10、what choiceswere made and that the report reflect the choices made whenusing Test Method A on rifled steam generator tubes.1.7 There are some steam generator tubes where it isapparent that half of the tube is exposed to the flame from theexternal appearance,this side is typically called the fireside
11、 orhot side.The other half of the tube is not exposed to the flamefrom the external appearance is typically called the casing sideor cold side.These test methods also require that the tube besplit in half,so the tube is generally split along these lines.Onthese tubes it is generally found that more
12、internal depositionexists on the fireside or hot side.Some users of these methodswill determine the deposition only on side where it appearsvisually that more deposition exists.Some users will determinethe deposition on both sides and report the results separatelyand some will average the two result
13、s.It is important that theuser of the data be aware of the choices made and that thereport of the results be specific.1.8 The values stated in either SI or inch-pound units are tobe regarded as the standard.The values given in parenthesesare for information only.1.9 This standard does not purport to
14、 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 determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D887 Practices for Sampl
15、ing Water-Formed Deposits1These test methods 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 W
16、ater.Current edition approved Jan.1,2014.Published January 2014.Originallyapproved in 1975.Last previous edition approved in 2009 as D3483 83(2009).DOI:10.1520/D3483-14.2For 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.Un
