ASTM C950 C950M-2008 Standard Practice for Repair of a Rigid Cellular Polyurethane Insulation System on Outdoor Service Vessels《室外容器上刚性蜂窝式聚氨酯绝缘系统检修的标准实施规程》.pdf

1、Designation: C 950/C950M 08Standard Practice forRepair of a Rigid Cellular Polyurethane Insulation Systemon Outdoor Service Vessels1This standard is issued under the fixed designation C 950/C950M; the number immediately following the designation indicates the yearof original adoption or, in the case

2、 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 normall

3、y 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 o

4、nly, 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 t

5、wo systems may result in non-conformancewith the standard.1.4 This standard may involve hazardous materials, opera-tions, 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 establishappro

6、priate 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:2C 168 Terminology Relating to Thermal InsulationC 945 Practice for Design Considerations and Spray Appli-

7、cation of a Rigid Cellular Polyurethane Insulation Systemon Outdoor Service Vessels3. Terminology3.1 GeneralDefinitions included in Terminology C 168shall apply to the terms used in this practice.4. Surface Preparation4.1 All damaged or nonadhering foam shall be removed tothe substrate in all direct

8、ions, 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 prime

9、r 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 f

10、ollowingmanners: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

11、 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 t

12、oprovide 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.)1This pract

13、ice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.40 on InsulationSystems.Current edition approved Dec. 1, 2008. Published December 2008. Originallyapproved in 1981. last previous edition approved in 2005 as C 95005.2For ref

14、erenced 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, We

15、st Conshohocken, PA 19428-2959, United States.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 t

16、o the substrate or interlaminant adhesion of the foam.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 operatingbelow +70F 21C, repair them the same day without excep-tion.5.6 The spray-appl

17、ied 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.5.7 All surface preparation, accessory preparation, sprayfoam

18、application, and protective coating application shall be inaccordance with Practice C 945.6. Keywords6.1 coating; outdoor service vessels; spray foamASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users

19、 of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every f

20、ive years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical

21、 committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 950/C950M 082