Designation:D5251–98a(Reapproved2003)StandardPracticefortheOperationoftheTetrapodWalkerDrumTester1ThisstandardisissuedunderthefixeddesignationD5251;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticedescribestheequipmentandoperationoftheTetrapodWalkerfortestingpilefloorcoveringswithathicknessof20mm(0.8in.)orlessbecausethickermaterialsimpedeproperoperationofthetumbler.1.2Thispracticeisapplicableforuseintestingunusedpilefloorcoveringofalltypes.Itisnotapplicableforuseintestingusedpilefloorcovering.1.3ThevaluesstatedineitheracceptableSIunitsorinotherunitsshallberegardedseparatelyasthestandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheothers,withoutcombiningvaluesinanyway.Incaseofrefereedecisions,theSIunitsshallprevail.1.4Thispracticedoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthispracticetoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D123TerminologyRelatingtoTextiles2D418MethodsofTestingPileYarnFloorCoveringCon-struction2D1776PracticeforConditioningTextilesforTesting2D5684TerminologyRelatingtoPileFloorCoverings33.Terminology3.1Definitions—Fordefinitionsofpileyarnfloorcoveringrelatedtermsusedinthispractice,refertoTerminologyD5684.Fordefinitionsofothertextiletermsusedinthispractice,refertoTerminologyD123.4.SummaryofPractice4.1Thespecimenissecuredastheliningofarotatabledrumwiththepilesurfaceexposed.Afourleggedmetalcasting(tetrapod)8walks’onthepilesurfaceofthespecimenasitistumbledinthedrum.Thedrumisrotatedaboutitslongitudinalaxisforaspecifiednumberofrevolutions.5.SignificanceandUse5.1Thisequipmentmaybeusedtobringaboutthechangesin...
