ASTM_C_950_-_C_950M_-_08_2012.pdf

Designation:C950/C950M08(Reapproved 2012)Standard Practice forRepair of a Rigid Cellular Polyurethane Insulation Systemon Outdoor Service Vessels1This standard is issued under the fixed designation C950/C950M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the repair of spray-applied polyure-thane insulation on vessels normally operating at temperaturesbetween 30 and+107C 22 and+225F.1.2 WarningAt temperatures below 0C 32F the ap-plication of a spray“foam”directly onto the cold substrate maynot be possible.The term“foam”applies to spray-appliedpolyurethane or polyisocyanurate(PUR or PIR)rigid cellularplastic only,and not to any other plastic insulation.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns associated with its use.It isthe responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.For aspecific precautionary statement see 1.2.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC945 Practice for Design Considerations and Spray Appli-cation of a Rigid Cellular Polyurethane Insulation Systemon Outdoor Service Vessels3.Terminology3.1 GeneralDefinitions included in Terminology C168shall apply to the terms used in this practice.4.Surface Preparation4.1 All damaged or nonadhering foam shall be removed tothe substrate in all directions,until dry,solidly adhering foamis encountered.4.2 The remaining foam insulation shall be beveled on allsides to approximately a 45 angle.4.3 The substrate shall be examined and if the existingprimer is damaged,it shall be wire-brushed and reprimed,where feasible,in accordance with the primer manufacturersinstructions.4.4 A covering shall be installed around the area to berepaired,prior to spray foam application,to protect thesurrounding undamaged area from overspray and removedafter completion of the repair work.5.Repair Procedure5.1 The repair shall be accomplished in one of the followingmanners:5.1.1 Foam shall be spray applied to the prepared area andtop-coated with the specified protective coating.(An open-weave reinforcing fabric may be embedded into the wet firstcoat if desired.Caution shall be taken to embed the reinforcingfabric totally within the coating.)5.1.2 For substrate temperatures below 0C 32F,thefollowing procedure shall be used:Cut to shape and install athin layer of rigid PUR/PIR board(to insulate the surface)inthe prepared area with a joint sealer.Apply spray foam inaccordance with 5.1.1.5.2 All horizontal areas shall be repaired in a manner toprovide drainage and prevent free-standing water.5.3 Spraying shall not be done in the presence of water(rain,fog,condensation,etc.)or wind velocities greater than 15mph 24 km/h.(With the owners approval,shielded scaffoldsmay be used in wind velocities greater than 15 mph 24 km/h.)5.4 On the scaffolding or on the horizontal areas,or both,sufficient buckets,plastic film,etc.,shall be kept with theapplicator to counteract a problem without depositing anyforeign material on the substrate that could affect either initialadhesion to the substrate or interlaminant adhesion of the foam.1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.40 on InsulationSystems.Current edition approved Oct.1,2012.Published October 2012.Originallyapproved in 1981.last previous edition approved in 2008 as C95008.DOI:10.1520/C0950_C0950M-12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.5 All prepared areas shall be repaired the same day oradequately covered to prevent the intrusion of moisture orother foreign materials,or both.On vessels operating be-low+70F 21C,repair them the same day without excep-tion.5.6 The spray-applied foam or rigid board shall be dry,clean,and free of dust before application of the protectivecoating.If the insulation has been left uncoated for more than3 days,the surface shall be brushed and air blown beforeapplying the coating.5.