1、Designation:G1404(Reapproved 2010)1Standard Test Method forImpact Resistance of Pipeline Coatings(Falling WeightTest)1This standard is issued under the fixed designation G14;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of
2、 last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1NOTEEquation in Table X2.1 was corrected editorially in November 2012.1.Scope1.1 This test method covers the determination of the ener
3、gyrequired to rupture coatings applied to pipe under specifiedconditions of impact from a falling weight.1.2 The values stated in SI units to three significant deci-mals are to be regarded as the standard.The values given inparentheses are for information only.1.3 This standard does not purport to a
4、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:2G12 Test Method
5、 for Nondestructive Measurement of FilmThickness of Pipeline Coatings on Steel(Withdrawn2013)3G62 Test Methods for Holiday Detection in Pipeline Coat-ings2.2 SAE Standard:Grade 52100 Steel43.Summary of Test Method3.1 This test method uses a falling fixed weight having aspecified diameter impact surf
6、ace,tup,which is restrainedvertically and dropped from varying heights to produce impactenergies over the required range.Electrical inspection is usedto detect resultant breaks in the coating.Impact resistance isdetermined as the amount of energy required to cause penetra-tion of the coating film.4.
7、Significance and Use4.1 The ability of a pipe coating to resist mechanicaldamage during shipping,handling,and installation will dependupon its impact resistance.This test method provides asystematic means for screening coating materials with regardto this property.5.Apparatus5.1 This test method can
8、 be successfully used with impactapparatus conforming to the following specifications:5.1.1 TupThe tup shall be made up from a tup body and atup nose having a combined,fixed weight of 1.361 kg(3.00 lb)and shall be used over a drop range of 0.61 to 1.22 m(2 to 4ft).With most coatings,a 1.361-kg(3.00-
9、lb)tup droppedthrough a distance of 914 mm(3 ft)yields suitable results.Thetup nose shall have a 15.875-mm(58-in.)hemispherical head.NOTE1Frequent replacement of the tup nose can be avoided if it iscut from steel capable of being hardened to a hardness of Rockwell C/45while retaining an impact tough
10、ness of at least 15 ftlb(20.34 J).Ballbearings conforming to SAE Grade 52100 have also been found suitablefor this purpose.5.1.2 Drop TubeA tube 1.52 m(5 ft)long shall be used tocontain the tup and guide it during free fall.The drop tube shallbe constructed of steel,aluminum,or any other suitably ri
11、gidmaterial and internally sized to provide a minimum of frictionto the falling tup.A scale shall be attached for measuring theheight of drop to the nearest 2.54 mm(0.10 in.).5.1.3 Specimen HolderThe base plate of the apparatusshall include a device for positioning and holding the pipespecimen on li
12、ne with the axis of the vertical drop tube.NOTE2An arrangement using a V-notch vise made of metal withspring clamp is recommended for this purpose.Glancing blows,caused byan out-of-plumb condition between drop tube and pipe sample,will causeerratic test results.1This test method is under the jurisdi
13、ction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.48 on Durability of Pipeline Coating and Linings.Current edition approved Dec.1,2010.Published December 2010.Originallyapproved in 1969.Last previous edition approv
14、ed in 2004 as G14 04.DOI:10.1520/G0014-04R10E01.2For 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.3The last approved
15、 version of this historical standard is referenced onwww.astm.org.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.4 Apparatus Suppo
16、rtBoth the apparatus and sampleshall be firmly supported and secured to a rigid base tooptimize energy transfer from the tup to the specimen.5.2 A design for the test apparatus appears in Figs.X1.1-X1.3 of Appendix X1.5.3 Thickness GageMeasurements of coating thicknesswill be required for this test,and shall be done in accordancewith Test Method G12.5.4 Holiday DetectorA suitable detector as specified inTest Methods G62 shall be used to locate breaks in the coatingfilm.6.Test Specimen6.1 The tes
