Designation:C950/C950M−08(Reapproved2012)StandardPracticeforRepairofaRigidCellularPolyurethaneInsulationSystemonOutdoorServiceVessels1ThisstandardisissuedunderthefixeddesignationC950/C950M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstherepairofspray-appliedpolyure-thaneinsulationonvesselsnormallyoperatingattemperaturesbetween−30and+107°C[−22and+225°F].1.2Warning—Attemperaturesbelow0°C[32°F]theap-plicationofaspray“foam”directlyontothecoldsubstratemaynotbepossible.Theterm“foam”appliestospray-appliedpolyurethaneorpolyisocyanurate(PURorPIR)rigidcellularplasticonly,andnottoanyotherplasticinsulation.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcernsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Foraspecificprecautionarystatementsee1.2.2.ReferencedDocuments2.1ASTMStandards:2C168TerminologyRelatingtoThermalInsulationC945PracticeforDesignConsiderationsandSprayAppli-cationofaRigidCellularPolyurethaneInsulationSystemonOutdoorServiceVessels3.Terminology3.1General—DefinitionsincludedinTerminologyC168shallapplytothetermsusedinthispractice.4.SurfacePreparation4.1Alldamagedornonadheringfoamshallberemovedtothesubstrateinalldirections,untildry,solidlyadheringfoamisencountered.4.2Theremainingfoaminsulationshallbebeveledonallsidestoapproximatelya45°angle.4.3Thesubstrateshal...
