1、Designation:D525614Standard Test Method forRelative Efficacy of Dynamic Solvent Systems forDissolving Water-Formed Deposits1This standard is issued under the fixed designation D5256;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the
2、 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.1.Scope1.1 This test method covers the determination of the relativeefficacy of dynamic solvent systems for dissolving water-
3、formed deposits that have been removed from the underlyingmaterial or deposits attached to the underlying material.1.2 The nature of this test method is such that statements ofprecision and bias as determined by round robin tests couldmislead users of this test method(see Sections 11 and 12).Therefo
4、re,no precision and bias statements are made.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 a
5、ddress 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.2.Referenced Documents2.1 ASTM Standards:2D887 Practices
6、for Sampling Water-Formed DepositsD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2331 Practices for Preparation and Preliminary Testing ofWater-Formed DepositsD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3263 Tes
7、t Methods for Corrosivity of Solvent Systems forRemoving Water-Formed Deposits(Withdrawn 2008)3D3483 Test Methods forAccumulated Deposition in a SteamGenerator Tube3.Terminology3.1 Definitions:3.1.1 For definitions of other terms used in this test method,refer to Terminology D1129.3.2 Definitions of
8、 Terms Specific to This Standard:3.2.1 dynamic solvent system,nany closed loop system inwhich the solvent is in motion across the deposit surface.3.2.2 single and multiple solvent systems,na single sol-vent system is a one-solution treatment.A multiple solventsystem is a treatment using two or more
9、solutions in sequence.3.2.3 solvent system,nspecified chemicals or combinationof chemicals,that may include corrosion inhibitors,formulatedto react with and remove deposits.3.2.4 water-formed deposits,nany accumulation of in-soluble material derived from water or formed by the reactionof water upon
10、the surface in contact with the water.3.2.4.1 DiscussionDeposits formed from or by water in allits phases may be further classified as scale,sludge,corrosionproducts,or biological deposits.The overall composition of adeposit or some part of a deposit may be determined bychemical or spectrographic an
11、alysis;the constituents actuallypresent as chemical substances may be identified by micro-scope or x-ray diffraction studies.Organisms may be identifiedby microscopical or biological methods.4.Summary of Test Method4.1 This test method consists of determining the ability of adynamic solvent system t
12、o dissolve deposits.4.2 For the unattached deposits,this test method consists ofexposing weighed amounts of deposit to the dynamic solventsystems and determining the weight loss of the exposeddeposit,thereby determining the efficacy of the solvent system.4.3 For the attached deposits,the amount and
13、time requiredto yield a constant amount of certain loss of interest and the1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process U
14、se,On-Line Water Analysis,and Surveillance of Water.Current edition approved March 15,2014.Published April 2014.Originallyapproved 1992.Last previous edition approved in 2009 as D5256 05(2009).DOI:10.1520/D5256-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cust
15、omer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West
16、Conshohocken,PA 19428-2959.United States1 amount of deposit not removed determines the relative efficacyof the dynamic solvent system.5.Significance and Use5.1 This test method is useful because the choice of asolvent system for removing water-formed deposits dependsupon the ability of the dynamic solvent system to dissolve bothunattached and attached deposits.6.Apparatus6.1 Common Equipment:NOTE1The equipment listed in this section is basic and serves thefunction of this test method.This basic
