1、Designation:D314721Standard Test Method for TestingStop-Leak Additives for Engine Coolants1This standard is issued under the fixed designation D3147;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number i
2、n 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 This test method covers screening procedures for thepreliminar
3、y evaluation of leak-stopping materials intended foruse in engine cooling systems.(Heavy-duty users are referredto X1.2.21 in Specification D4485 for additional information.)1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses after SI units areprovided for
4、 information only and are not considered standard.1.3 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,health,and environmental practices and deter-mine the applica
5、bility of regulatory limitations prior to use.Specific warning statements are given in 10.1.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standa
6、rds,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAntirusts for Testing PurposesD4485 Specification for Performanc
7、e of Active API ServiceCategory Engine OilsD4725 Terminology for Engine Coolants and Related FluidsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 leakingfrequent drops forming(more than 5 drops/min).3.1.2 sealedco
8、mpletely plugged with no leaking or seep-ing.3.1.3 seepingoccasional drops forming(fewer than5 drops min).3.2 For definitions of terms used in this test method,refer toTerminology D4725.4.Summary of Test Method4.1 Aheated test solution is circulated through a pressurizedcubical metal reservoir which
9、 contains a slit and holes tosimulate leaks in an engine cooling system.The effectivenessof the stop-leak material is measured by its ability to seal theleaks under the prescribed conditions of flow rate,temperature,pressure,and time.4.2 The presence of particles in the test material that arelarger
10、than 0.84 mm(0.033 in.)or the presence of gumming orgelling in stop-leak additives is determined by screening a testsolution through a 850 m(U.S.No.20)standard sieve.Thescreening is done both before and after the circulating test.Particles that remain on the sieve may be too large to passthrough som
11、e passages of the cooling system.5.Significance and Use5.1 The screening procedures simulate the conditions oftemperature,pressure,and circulation encountered in service.This test method will indicate whether a product is suitable forfurther evaluation in vehicles.6.Apparatus(See Fig.1)6.1 Reservoir
12、:6.1.1 The reservoir shall be constructed of stainless steel,aluminum,or brass,260 mm by 175 mm by 260 mm(10 in.by7 in.by 10 in.)high,and the total capacity of the assembledunit shall be between 12 L and 13.5 L(3.2 gal to 3.6 gal).Thereservoir shall have a 20 mm(34in.)flange at the top,to whicha cov
13、er plate is fitted.6.1.2 The reservoir and cover shall have a minimum thick-ness of 1.6 mm(0.06 in.)in order to withstand a pressure of140 kPa(20 psi).1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of Subcommitt
14、eeD15.09 on Simulated Service Tests.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 1972.Last previous edition approved in 2013 as D3147 06(2013).DOI:10.1520/D3147-21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service a
15、t 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 StatesThis international standard was developed in accordance wi
16、th internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.16.1.3 A drain shall be located either on one side or thebottom of the reservoir to facilitate drainage of the testsolution.The reservoir outlet to the circulating pump(suctionside)shall be located near the bottom of Side C.The reservoirinlet f
