1、Designation: C1767 12Standard 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.1This test method is under the jurisdiction ofASTM Com
13、mittee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.40 on InsulationSystems.Current edition approved Oct. 15, 2012. Published December 2012. DOI:10.1520/C1767-12.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For refe
14、renced 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
15、 Conshohocken, PA 19428-2959. United States13.2.2 cladding (as related to insulation jacketing)synonymous with jacketing.3.2.2.1 DiscussionThe three terms “jacketing”, “lagging”,and “cladding” are considered synonymous in most applica-tions and geographies. However, in some cases in the powerindustr
16、y 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 differences in oxygen concentrationin the electrolyte in adjacent region
17、s 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 corrugatedstainless steel sheet formed to havealternating parallel grooves a
18、nd 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 to insulation jacketing)synonymous with jacketing.3.2.7.1 DiscussionThe t
19、hree 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 “jacketing” or “cladding” and refers specificallyto a heavier gauge of jacketi
20、ng.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 inhibit jacket corrosion by interfering with theformation of a galvanic
21、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 polykrafta multilayer composite film used as amoisture retarder on metal jack
22、eting 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 weight which is the mass per area in units oflbs/3000 ft2. In Metric uni
23、ts, 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 consisting of at least one layer ofethylene/methacrylic acid copolymer and
24、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 splice roll occurs when the metalcoil being used to form the roll jacketi
25、ng 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. Significance and Use4.1 This specification is used to specify material by
26、 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 steel jacketing.5. Classification5.1 Classification of stainless steel ja
27、cketing 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 temper5.1.2.2 Grade 2 = Alloy T-316/T-316L, annealed temperNOTE 1The “L” in the alloy
28、 is an indication of low carbon content.Since the low carbon alloy will avoid corrosion problems caused bywelding, a low carbon alloy is 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 sta
29、ndard alloys areconsidered interchangeable for use as insulation jacketing.5.1.3 Moisture Retarder:5.1.3.1 Class A = polysurlyn, 3 mil thick5.1.3.2 Class C = polykraft per section 3.2.105.1.3.3 ClassE=nomoisture retarderNOTE 2ClassesB straight pipe, pipe elbows/fittings,and vessels/equipment. The re
30、quirements for each of theseapplications differ.10.3 Stainless Steel Jacketing on Straight Pipe:10.3.1 At the point of application, stainless 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 stainle
31、ss 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 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
32、 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 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 0.0
33、20 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 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 requ
34、ires 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 Stainless 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 p
35、re-rolledto fit around the insulation. For outer insulation diameters of 20in. (508 mm) or larger, the use of 8-piece sections on pipeelbows/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 Table4 when the insula
36、tion outer diameter conforms to the targetvalues in Practices C585 or C450.TABLE 4 Minimum Overlap at Heel and Throat of Two-pieceElbowsInsulation O.D.inches (mm)Minimum Elbow Heel andThroat Overlap,Ainches (mm)Up to 2.375 (60.3) 0.4375 (11.1)2.875 (73.0) and up 0.625 (15.9)AAlso called the “tangent
37、”.C1767 124NOTE 9When the insulation outer diameter is smaller 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 PracticesC58
38、5 or C450 causes, in some cases, undesirable gaps in the joint 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 requir
39、e-ments in 10.5.2 to 10.5.4, stainless steel jacketing applied 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
40、em-bossed finish shall be used (no deep corrugated sheet or316 in.corrugated finish).NOTE 10When 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,m
41、ore dirt collection, poorer aesthetics, and an increased likelihood 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 acceptab
42、le. For verticalvessels and equipment 8 ft (2.44 m) diameter 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
43、) is recom-mended.11. Test Methods11.1 Outer Jacket Surface EmittanceTest 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 Spec
44、i-fication A480/A480M.11.4 Pinholes in Moisture RetarderTest 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
45、Vapor Transmission Rate of the MoistureRetarderTest in accordance 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 large
46、stquantity of a specific stainless steel jacketing received by 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 jacket
47、ing within a lot, thatis, one roll in a lot of rolls or one bundle 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,
48、 the user shall request certification to spe-cific test requirements.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 mor
49、e of the 10 % sampled units isdetermined to be defective, the 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 finishrequirement
