ASTM C950-2005 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
《ASTM C950-2005 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》由会员分享,可在线阅读,更多相关《ASTM C950-2005 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(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 950 05Standard Practice forRepair of a Rigid Cellular Polyurethane Insulation Systemon Outdoor Service Vessels1This standard is issued under the fixed designation C 950; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 at temperaturesbetween 30 and + 107C (22 and + 225F).1.2 CautionAt temperatures below 0C (32F) the appli-cation 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, an
4、d not to any other plastic insulation.1.3 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 establishappropriate safety and he
5、alth 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-cation of a Rigid Ce
6、llular 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 directions, until dry, sol
7、idly 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 manufacturersinstr
8、uctions.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.
9、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 temperatu
10、res 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
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