1、Designation: C1767 16Standard 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. No other units of measurement are included in thisstandard.1.6 A version of this standard in SI units is available asSpecificat
7、ion C1767M.1.7 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.2. R
8、eferenced Documents2.1 ASTM Standards:3A167 Specification for Stainless and Heat-ResistingChromium-Nickel Steel Plate, Sheet, and Strip (With-drawn 2014)4A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for PressureVessels and for General Applications
9、A480/A480M Specification 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 Out
10、er Diameters of 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
11、for ThermalInsulationC1729 Specification for Aluminum Jacketing for InsulationC1767M Specification for Stainless Steel Jacketing for In-sulationC1785 Test Method for Concentration of Pinhole Detectionsin Moisture Barriers on Metal JacketingE84 Test Method for Surface Burning Characteristics ofBuildi
12、ng MaterialsF1249 Test Method for Water Vapor Transmission RateThrough Plastic Film and Sheeting Using a ModulatedInfrared Sensor3. Terminology3.1 DefinitionsDefinitions in Terminology C168 apply toterms used in this specification.1This specification is under the jurisdiction of ASTM Committee C16 o
13、nThermal Insulation and is the direct responsibility of Subcommittee C16.40 onInsulation Systems.Current edition approved March 1, 2016. Published March 2016. Originallyapproved in 2012. Last previous edition approved in 2015 as C1767 15. DOI:10.1520/C1767-16.2The boldface numbers in parentheses ref
14、er 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 volume information, refer to the standards Document Summary page onthe ASTM website.4The
15、last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2 Definitions of Terms Specific to This Standard:3.2.1 box ribstainless steel sheet formed to have altern
16、at-ing parallel grooves and ridges with a cross section approxi-mating a square wave.3.2.2 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. H
17、owever, 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 corrosion, nin metal jacketing localizedcorrosion of metal jacketing surface at, or immediately ad
18、ja-cent to an area that is shielded from full exposure to theenvironment because of close proximity between the metal andthe surface of another material.3.2.4 cross crimpedsynonymous with316 in. corrugated.3.2.5 deep corrugatedstainless steel sheet formed to havealternating parallel grooves and ridg
19、es 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 three te
20、rms “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 jacketing.3.2.
21、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 cell be
22、tween 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 jacketing c
23、onsisting 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 oflb/3000 ft2. 40 lb Kraft has a bas
24、is weight of 40 lb/3000 ft2.3.2.11 polyfilmin relation to metal jacketing, a three-layerfilm used as a moisture retarder on metal jacketing consistingof one layer of ethylene/methacrylic acid copolymer and twolayers of other polymers, usually polyethylene.3.2.12 safety edgean edge of metal jacketing
25、 that has beende-burred or rounded by a rolling operation.3.2.13 safety hema rounded edge of metal jacketing cre-ated by folding the edge of sheet jacketing completely backupon itself using a roll former or a brake.3.2.13.1 Discussionthe fold is typically made toward theunderside of the jacketing so
26、 that the original edge is hiddenand the external appearance of the jacketing is preserved3.2.14 splice rollmetal jacketing sold in roll form wherethe package contains two separate pieces of metal jacketingrolled approximately end to end.3.2.14.1 DiscussionA splice roll occurs when the metalcoil bei
27、ng used to form the roll jacketing reaches its end beforethe required roll length is obtained.3.2.15 split rollsynonymous with splice roll.3.2.16 surface finish (as related to insulation jacketing)the final texture of the stainless steel jacketing surface.4. Significance and Use4.1 This specificatio
28、n 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 steel jacketing.5. Classification5.1 Clas
29、sification 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 temper5.1.2.2 Grade 2 = Alloy T-316/T-316L, annealed
30、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 is required on those rare occasions when t
31、hestainless 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 = polyfilm, 3 mil thick5.1.3.2 Class C = polykraft per sectio
32、n 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, stainless steel jacketingused on straight pipe
33、 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 a jacket diameter of 24 in.,the minimum all
34、owable thickness is 0.010 in. and Grade 1 orGrade 2 stainless steel shall be used.10.3.2.2 For straight pipe with jacket diameter greater than24 in. up to 36 in., the minimum allowable thickness is 0.016in. and Grade 1 or Grade 2 stainless steel shall be used.10.3.2.3 For straight pipe with a jacket
35、 diameter greater than36 in., the minimum allowable thickness is 0.020 in. and Grade1 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. or greater.Grade 1 or Grade 2 stainless steel shall be used.10.3
36、.4 Stainless steel jacketing on straight pipe requires theuse of a moisture retarder so only Classes A or C shall be used.C1767 16410.4 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 (press
37、ed),4-piece, or gores all of which shall be pre-formed or pre-rolledto fit around the insulation. For outer insulation diameters of 20in. or larger, the use of 8-piece sections on pipe elbows/fittingsis acceptable.10.4.1.1 For 2-piece (pressed) elbows, the overlaps at theheel and throat shall comply
38、 with the minimum values in Table4 when the insulation outer diameter conforms to the targetvalues in Practices C585 or C450.NOTE 10When the insulation outer diameter is smaller or larger thanthat specified in Practices C585 or C450, the heel and throat overlaps willbe larger or smaller than58 in. W
39、ith 2-piece (pressed) elbows, deviationsin insulation outer diameter from that specified in Practices C585 or C450causes, in some cases, undesirable gaps in the joint at the heel or throat.10.4.2 Stainless steel jacketing used shall be Grade 2(T-316/T316L annealed), 0.016 in. thick.10.5 Stainless St
40、eel 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 applied toequipment and vessels shall be of any size and shape agreedupon by purchaser and seller.10.5.2 The minimum allowable stainless steel jacket
41、ingthickness 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 or316 in.corrugated finish).NOTE 11When deep corrugated or316 in. corrugated sheet is used onhorizontal vessels, there is a tendency for water to p
42、ond 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 likelihood ofwater penetrating the jacket and entering the insulation system.10.5.4 For vertical vessels and equipment less than 8 ftdiameter, any
43、finish of stainless steel jacketing or stainless steeldeep corrugated sheet is acceptable. For vertical vessels andequipment 8 ft diameter and greater, deep corrugated stainlesssteel sheet jacketing shall be used.10.6 The purchaser shall be aware that Grade 1 (T-304/T-304L alloy) is normally used in
44、 most applications except themost corrosive areas, where Grade 2 (T-316/T-316L) 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 jacketi
45、ng exposedto the flames.11.3 Metal Sheet ThicknessTest in accordance with Speci-fication A480/A480M.11.4 Pinhole Detections in Moisture RetarderTest in ac-cordance with Test Method C1785.11.4.1 Pass CriteriaThe moisture retarder is consideredacceptable when no more than 5 pinhole detections,collecti
46、vely, are detected in the 10 wetted test areas.11.5 Water Vapor Transmission Rate of the MoistureRetarderTest in accordance with Test Method F1249 at 73Fand 100 % relative humidity with results normalized to 1atmosphere of pressure.12. Sampling, Inspection, and Rejection of DefectiveMaterial12.1 A l
47、ot of material shall be considered to be the largestquantity 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 s
48、mallestpackaged quantity of stainless steel jacketing 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 t
49、ests on an inspection basis, whendeemed necessary, 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 more 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 m
