1、Designation: C1767 13Standard Specification forStainless Steel Jacketing for Insulation1This standard is issued under the fixed designation C1767; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number
2、in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers stainless steel jacketing forthermal, acoustical, and fire protective insulation operating ateither above or below a
3、mbient temperatures and in both indoorand outdoor locations. It does not cover insulation jacketingmade from other materials such as mastics, fiber reinforcedplastic, PVC, aluminum, or coated carbon steel (for example,aluminum-zinc, galvanized steel, or aluminized steel) nor doesit cover the details
4、 of thermal, acoustical, or fire protectiveinsulation systems.1.2 While not intended to cover use inside the containmentbuildings of nuclear power plants, this standard does notpreclude use of Class E material which does not have amoisture barrier in this containment building application.1.3 This sp
5、ecification provides physical requirements forstainless steel jacketing for thermal and acoustical insulation.Guide C1423 provides guidance in selecting jacketing materi-als and their safe use.1.4 This is a material specification and does not imply anyperformance of the installed system using the ma
6、terials speci-fied herein. For information about installation of stainless steeljacketing, see (1).21.5 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not consi
7、dered standard.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.
8、2. Referenced Documents2.1 ASTM Standards:3A167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate, Sheet, and StripA240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for PressureVessels and for General ApplicationsA480/A480M Spec
9、ification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet, and StripC168 Terminology Relating to Thermal InsulationC450 Practice for Fabrication of Thermal Insulating FittingCovers for NPS Piping, and Vessel LaggingC585 Practice for Inner and Outer Diameters of
10、 ThermalInsulation for Nominal Sizes of Pipe and TubingC835 Test Method for Total Hemispherical Emittance ofSurfaces up to 1400CC1371 Test Method for Determination of Emittance ofMaterials Near Room Temperature Using Portable Emis-sometersC1423 Guide for Selecting Jacketing Materials for ThermalInsu
11、lationC1729 Specification for Aluminum Jacketing for InsulationE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsF1249 Test Method for Water Vapor Transmission RateThrough Plastic Film and Sheeting Using a ModulatedInfrared Sensor3. Terminology3.1 DefinitionsDefinitions in Term
12、inology C168 apply toterms used in this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 box ribstainless steel sheet formed to have alternat-ing parallel grooves and ridges with a cross section approxi-mating a square wave.3.2.2 cladding (as related to insulation jacketing)syn
13、onymous with jacketing.1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.40 on InsulationSystems.Current edition approved May 1, 2013. Published June 2013. Originallyapproved in 2012. Last previous edition appro
14、ved in 2012 as C176712. DOI:10.1520/C1767-13.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volu
15、me 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 States13.2.2.1 DiscussionThe three terms “jacketing”, “lagging”,and “cladding” are considered synonymous in most
16、applica-tions and geographies. However, in some cases in the powerindustry in North America the term “lagging” has a differentmeaning than “jacketing” or “cladding” and refers specificallyto a heavier gauge of jacketing.3.2.3 crevice corrosiona type of corrosion occurring onmetal jacketing caused by
17、 differences in oxygen concentrationin the electrolyte in adjacent regions of the material.3.2.3.1 DiscussionThese differences lead to a concentra-tion cell and the oxygen starved region on the metal jacketingis subject to corrosion.3.2.4 cross crimpedsynonymous with316 in. corrugated.3.2.5 deep cor
18、rugatedstainless steel sheet formed to havealternating parallel grooves and ridges with a cross sectionapproximating a sine wave.3.2.6 gorejacketing for elbows, fittings, or other non-straight portions of the piping system made from a multitude ofsimilar overlapping pieces.3.2.7 lagging (as related
19、to insulation jacketing)synonymous with jacketing.3.2.7.1 DiscussionThe three terms “jacketing”, “lagging”,and “cladding” are considered synonymous in most applica-tions and geographies. However, in some cases in the powerindustry in North America the term “lagging” has a differentmeaning than “jack
20、eting” or “cladding” and refers specificallyto a heavier gauge of jacketing.3.2.8 mill finishthe appearance of the stainless steel sur-face as supplied from the metal mill.3.2.9 moisture retarder (moister barrier)a layer of plasticfilm or other material applied to the inner side of metaljacketing to
21、 inhibit jacket corrosion by interfering with theformation of a galvanic cell between the dissimilar metals ofthe pipe and jacket or by preventing crevice corrosion.3.2.9.1 DiscussionA moisture retarder is not an insulationsystem water vapor retarder and does not perform the samefunction.3.2.10 poly
22、krafta multilayer composite film used as amoisture retarder on metal jacketing consisting of at least onelayer of minimum 40 lb Kraft paper and one or more layers ofplastic film, usually polyethylene at a minimum thickness of1.5 mils.3.2.10.1 DiscussionKraft paper is commonly referred toby its basis
23、 weight which is the mass per area in units oflbs/3000 ft2. In Metric units, this mass per area is called thegrammage and is in units of g/m2. 40 lb Kraft has a basisweight of 40 lbs/3000 ft2and a grammage of 65 g/m2.3.2.11 polysurlyna multilayer film used as a moistureretarder on metal jacketing co
24、nsisting of at least one layer ofethylene/methacrylic acid copolymer and one or more layers ofother polymers, usually polyethylene.3.2.12 splice rollmetal jacketing sold in roll form wherethe package contains two separate pieces of metal jacketingrolled approximately end to end.3.2.12.1 DiscussionA
25、splice roll occurs when the metalcoil being used to form the roll jacketing reaches its end beforethe required roll length is obtained.3.2.13 split rollsynonymous with splice roll.3.2.14 surface finish (as related to insulation jacketing)the final texture of the stainless steel jacketing surface.4.
26、Significance and Use4.1 This specification is used to specify material by physicalproperty requirements that address the prerequisites in Sections6 to 10. The designer of an insulation system, after determiningthe system requirements, shall use this specification to specifythe appropriate stainless
27、steel jacketing.5. Classification5.1 Classification of stainless steel jacketing is based onthree factors:5.1.1 Outer Surface Treatment and Emittance ():5.1.1.1 Type I = Bare surface, = 0.35.1.2 Alloy and Temper per Specification A240/A240M:5.1.2.1 Grade 1 = Alloy T-304/T-304L, annealed temper5.1.2.
28、2 Grade 2 = Alloy T-316/T-316L, annealed temperNOTE 1The four allowable alloys shown in 5.1.2 are of the austenitictype of stainless steel.NOTE 2The “L” in the alloy is an indication of low carbon content.Since the low carbon alloy will avoid corrosion problems caused bywelding, a low carbon alloy i
29、s required on those rare occasions when thestainless steel jacketing will be subjected to direct welding or the heatfrom welding nearby metal. The low carbon and standard alloys areconsidered interchangeable for use as insulation jacketing.5.1.3 Moisture Retarder:5.1.3.1 Class A = polysurlyn, 3 mil
30、thick5.1.3.2 Class C = polykraft per section 3.2.105.1.3.3 ClassE=nomoisture retarderNOTE 3ClassesB straight pipe, pipe elbows/fittings,and vessels/equipment. The requirements for each of theseapplications differ.10.3 Stainless Steel Jacketing on Straight Pipe:10.3.1 At the point of application, sta
31、inless steel jacketingused on straight pipe will consist of a multitude of pre-curvedpieces with dimensions per 8.2.10.3.2 The thickness (gauge) used for the stainless steeljacketing on straight pipe varies with jacket diameter as shownin this section and in Table 1.10.3.2.1 For straight pipe up to
32、a jacket diameter of 24 in.(610 mm), the minimum allowable thickness is 0.010 in. (0.25mm) and Grade 1 or Grade 2 stainless steel shall be used.10.3.2.2 For straight pipe with jacket diameter greater than24 in. (610 mm) up to 36 in. (914 mm), the minimum allowablethickness is 0.016 in. (0.4 mm) and
33、Grade 1 or Grade 2stainless steel shall be used.10.3.2.3 For straight pipe with a jacket diameter greater than36 in. (914 mm), the minimum allowable thickness is 0.020 in.(0.5 mm) and Grade 1 or Grade 2 stainless steel shall be used.10.3.3 When expected physical abuse is severe, consider-ation shall
34、 be given to using thickness of 0.024 in. (0.6 mm) orgreater. Grade 1 or Grade 2 stainless steel shall be used.10.3.4 Stainless steel jacketing on straight pipe requires theuse of a moisture retarder so only Classes A or C shall be used.10.4 Stainless Steel Jacketing on Pipe Elbow/Fittings:10.4.1 St
35、ainless steel jacketing applied to insulation on pipeelbows/fittings shall take the form of 2-piece (pressed),4-piece, or gores all of which shall be pre-formed or pre-rolledto fit around the insulation. For outer insulation diameters of 20in. (508 mm) or larger, the use of 8-piece sections on pipee
36、lbows/fittings is acceptable.10.4.1.1 For 2-piece (pressed) elbows, the overlaps at theheel and throat shall comply with the minimum values in TableC1767 1344 when the insulation outer diameter conforms to the targetvalues in Practices C585 or C450.NOTE 10When the insulation outer diameter is smalle
37、r or larger thanthat specified in Practices C585 or C450, the heel and throat overlaps willbe larger or smaller than 5/8 in. (16 mm). With 2-piece (pressed) elbows,deviations in insulation outer diameter from that specified in PracticesC585 or C450 causes, in some cases, undesirable gaps in the join
38、t at theheel or throat.10.4.2 Stainless steel jacketing used shall be Grade 2(T-316/T316L annealed), 0.016 in. (0.4 mm) thick.10.5 Stainless Steel Jacketing on Equipment and Vessels:10.5.1 Except for the thickness, finish, and Grade require-ments in 10.5.2 to 10.5.4, stainless steel jacketing applie
39、d toequipment and vessels shall be of any size and shape agreedupon by purchaser and seller.10.5.2 The minimum allowable stainless steel jacketingthickness shall be as listed in Table 1.10.5.3 For horizontal vessels, only smooth or stucco em-bossed finish shall be used (no deep corrugated sheet or31
40、6 in.corrugated finish).NOTE 11When deep corrugated or316 in. corrugated sheet is used onhorizontal vessels, there is a tendency for water to pond in the corruga-tions on the top of the vessel resulting in an increase in jacket corrosion,more dirt collection, poorer aesthetics, and an increased like
41、lihood ofwater penetrating the jacket and entering the insulation system.10.5.4 For vertical vessels and equipment less than 8 ft(2.44 m) diameter, any finish of stainless steel jacketing orstainless steel deep corrugated sheet is acceptable. For verticalvessels and equipment 8 ft (2.44 m) diameter
42、and greater, deepcorrugated stainless steel sheet jacketing shall be used.10.6 The purchaser shall be aware that Grade 1 (T-304/T-304L alloy) is normally used in most applications except themost corrosive areas, where Grade 2 (T-316/T-316L) is recom-mended.11. Test Methods11.1 Outer Jacket Surface E
43、mittanceTest in accordancewith Test Method C835 or C1371.11.2 Surface Burning CharacteristicsTest in accordancewith Test Method E84 with outer surface of jacketing exposedto the flames.11.3 Metal Sheet ThicknessTest in accordance with Speci-fication A480/A480M.11.4 Pinholes in Moisture RetarderTest
44、in accordancewith the procedure contained in Specification C1729, section11.4.11.4.1 Pass CriteriaThe moisture retarder is consideredacceptable when no more than 5 pinholes, collectively, aredetected in the 10 wetted test areas.11.5 Water Vapor Transmission Rate of the MoistureRetarderTest in accord
45、ance with Test Method F1249 at 73F(22.8C) and 100 % relative humidity with results normalizedto 1 atmosphere of pressure.12. Sampling, Inspection, and Rejection of DefectiveMaterial12.1 A lot of material shall be considered to be the largestquantity of a specific stainless steel jacketing received b
46、y thepurchaser under one order, or, when so designated by themanufacturer, that quantity of products identified as the par-ticular lot.12.2 Aunit of material shall be considered to be the smallestpackaged quantity of stainless steel jacketing within a lot, thatis, one roll in a lot of rolls or one b
47、undle of sheets in a lot ofsheeted material.12.3 Inspection shall consist of any tests for specificationconformance the user deems necessary. Due to the impracti-cality of performing some tests on an inspection basis, whendeemed necessary, the user shall request certification to spe-cific test requi
48、rements.12.4 Incoming lots shall be sampled at a minimum rate of5 % of units received for inspection.12.5 When any nonconformance to specification is detectedwithin the 5 % sample, increase sampling to 10 % of the lot.12.6 When 50 % or more of the 10 % sampled units isdetermined to be defective, the
49、 lot shall be considered unac-ceptable.12.7 It shall be left to the discretion of the user whether tocontinue sampling for acceptable material. In any case, unitsfound defective shall be considered unacceptable and rejected.12.8 The purchaser shall be aware that in some cases thereis natural and unavoidable variation in color, reflectivity, andother aspects of surface appearance in stainless steel mill finishfrom lot to lot. Provided the stainless steel meets the mill finishrequirements in section 6.2, variation in the appearance of thismill f
