1、Designation: C1767M 16aStandard Specification forStainless Steel Jacketing for Insulation1This standard is issued under the fixed designation C1767M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er 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 belo
3、w ambient 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 deta
4、ils 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
5、 specification 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
6、 materials speci-fied herein. For information about installation of stainless steeljacketing, see (1).21.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.NOTE 1A version of this specification in IP units is available asSpecific
7、ation C1767.1.6 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.2.
8、Referenced 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 Application
9、sA480/A480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet, and StripB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionC168 Terminology Relating to Thermal InsulationC450 Practice for
10、 Fabrication of Thermal Insulating FittingCovers for NPS Piping, and Vessel LaggingC585 Practice for Inner and Outer 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 Emit
11、tance ofMaterials Near Room Temperature Using Portable Emis-sometersC1423 Guide for Selecting Jacketing Materials for ThermalInsulationC1729M Specification for Aluminum Jacketing for Insula-tionC1767 Specification for Stainless Steel Jacketing for Insula-tionC1785 Test Method for Concentration of Pi
12、nhole Detectionsin Moisture Barriers on Metal JacketingD3363 Test Method for Film Hardness by Pencil TestE84 Test Method for Surface Burning Characteristics ofBuilding MaterialsF1249 Test Method for Water Vapor Transmission RateThrough Plastic Film and Sheeting Using a ModulatedInfrared Sensor1This
13、specification is under the jurisdiction of ASTM Committee C16 onThermal Insulation and is the direct responsibility of Subcommittee C16.40 onInsulation Systems.Current edition approved Sept. 1, 2016. Published September 2016. Originallyapproved in 2014. Last previous edition approved in 2016 as C176
14、7M 16. DOI:10.1520/C1767M-16A.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 volume information,
15、 refer to the standards Document Summary page onthe ASTM website.4The 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. Terminology3.1 DefinitionsDefiniti
16、ons in Terminology 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 ja
17、cketing)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 powerindustry in North America the term “lagging” has a differentmeaning than “jacketing” or “cladd
18、ing” and refers specificallyto a heavier gauge of jacketing.3.2.3 crevice corrosion, nin metal jacketing localizedcorrosion of metal jacketing surface at, or immediately adja-cent to an area that is shielded from full exposure to theenvironment because of close proximity between the metal andthe sur
19、face of another material.3.2.4 cross crimpedsynonymous with 4.8 mm corrugated.3.2.5 deep corrugatedstainless 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
20、 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 terms “jacketing,” “lagging,”and “cladding” are considered synonymous in most applica-tions and geographies. However, in some case
21、s in the powerindustry in North America the term “lagging” has a differentmeaning than “jacketing” or “cladding” and refers specificallyto a heavier gauge of jacketing.3.2.8 mill finishthe appearance of the stainless steel sur-face as supplied from the metal mill.3.2.9 moisture retarder (moister bar
22、rier)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 between the dissimilar metals ofthe pipe and jacket or by preventing crevice corrosion.3.2.9.1 DiscussionA moisture retarder is no
23、t 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 consisting of at least onelayer of minimum 65 g/m2Kraft paper and one or more layersof plastic film, usually polyethylene at a mi
24、nimum thickness of38 microns.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 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
25、 of 65 g/m2.3.2.11 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 PVdF based paint systema pigmented paint usedon the o
26、uter surface of metal jacketing to provide corrosionresistance and higher emittance than bare metal consisting of afairly thin primer paint layer covered by a thicker topcoat paintlayer where the latter is a polyvinylidene fluoride (PVdF) typepaint.3.2.13 PVF filma polymer film consisting of polyvin
27、ylfluoride used on the outer surface of metal jacketing to providecorrosion resistance and higher emittance than bare metal.3.2.14 safety edgean edge of metal jacketing that has beende-burred or rounded by a rolling operation.3.2.15 safety hema rounded edge of metal jacketing cre-ated by folding the
28、 edge of sheet jacketing completely backupon itself using a roll former or a brake.3.2.15.1 Discussionthe fold is typically made toward theunderside of the jacketing so that the original edge is hiddenand the external appearance of the jacketing is preserved3.2.16 splice rollmetal jacketing sold in
29、roll form wherethe package contains two separate pieces of metal jacketingrolled approximately end to end.3.2.16.1 DiscussionA splice roll occurs when the metalcoil being used to form the roll jacketing reaches its end beforethe required roll length is obtained.3.2.17 split rollsynonymous with splic
30、e roll.3.2.18 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 physicalproperty requirements that address the prerequisites in Sections6 to 10. The designer of an
31、 insulation system, after determiningthe system requirements, shall use this specification to specifythe appropriate stainless 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 = Bar
32、e surface, 0.3,5.1.1.2 Type II = Painted with pigmented paint, 0.8,5.1.1.3 Type IV = PVF film coated surface, 0.85, and5.1.1.4 Type V = Painted with a PVdF based paint system,0.8.NOTE 2Type III is omitted to maintain consistency with the similarstandard for aluminum jacketing, Specification C1729M.5
33、.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 3The four allowable alloys shown in 5.1.2 are of the austenitictype of stainless steel.NOTE 4The “L” in the alloy is an indication of low
34、carbon content.Since the low carbon alloy will avoid corrosion problems caused byC1767M 16a2welding, 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 standard alloys a
35、reconsidered interchangeable for use as insulation jacketing.5.1.3 Moisture Retarder:5.1.3.1 Class A = polyfilm, 76 microns thick5.1.3.2 Class C = polykraft per section 3.2.105.1.3.3 ClassE=nomoisture retarderNOTE 5ClassesB straight pipe, pipe elbows/fittings,and vessels/equipment. The requirements
36、for each of theseapplications differ.10.4 Stainless Steel Jacketing on Straight Pipe:10.4.1 At the point of application, stainless steel jacketingused on straight pipe will consist of a multitude of pre-curvedpieces with dimensions per 8.2.10.4.2 The thickness (gauge) used for the stainless steeljac
37、keting on straight pipe varies with jacket diameter as shownin this section and in Table 2.10.4.2.1 For straight pipe up to a jacket diameter of 610mm, the minimum allowable thickness is 0.25 mm and Grade1 or Grade 2 stainless steel shall be used.10.4.2.2 For straight pipe with jacket diameter great
38、er than610 mm up to 914 mm, the minimum allowable thickness is 0.4mm and Grade 1 or Grade 2 stainless steel shall be used.10.4.2.3 For straight pipe with a jacket diameter greater than914 mm, the minimum allowable thickness is 0.5 mm andGrade 1 or Grade 2 stainless steel shall be used.10.4.3 When ex
39、pected physical abuse is severe, consider-ation shall be given to using thickness of 0.6 mm or greater.Grade 1 or Grade 2 stainless steel shall be used.10.4.4 Stainless steel jacketing on straight pipe requires theuse of a moisture retarder so only Classes A or C shall be used.10.5 Stainless Steel J
40、acketing on Pipe Elbow/Fittings:10.5.1 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 pre-rolledto fit around the insulation. For outer insulation diameters of508 mm or larger, the
41、use of 8-piece sections on pipeelbows/fittings is acceptable.10.5.1.1 For 2-piece (pressed) elbows, the overlaps at theheel and throat shall comply with the minimum values in Table4 when the insulation outer diameter conforms to the targetvalues in Practices C585 or C450.NOTE 13When the insulation o
42、uter diameter is smaller or larger thanthat specified in Practices C585 or C450, the heel and throat overlaps willbe larger or smaller than 16 mm. With 2-piece (pressed) elbows,deviations in insulation outer diameter from that specified in PracticesC585 or C450 causes, in some cases, undesirable gap
43、s in the joint at theheel or throat.10.5.2 Stainless steel jacketing used shall be Grade 2(T-316/T316L annealed), 0.4 mm thick.10.6 Stainless Steel Jacketing on Equipment and Vessels:10.6.1 Except for the thickness, finish, and Grade require-ments in 10.6.2 to 10.6.4, stainless steel jacketing appli
44、ed toequipment and vessels shall be of any size and shape agreedupon by purchaser and seller.10.6.2 The minimum allowable stainless steel jacketingthickness shall be as listed in Table 2.10.6.3 For horizontal vessels, only smooth or stucco em-bossed finish shall be used (no deep corrugated sheet or
45、4.8mm corrugated finish).NOTE 14When deep corrugated or 4.8 mm 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 lik
46、elihood ofwater penetrating the jacket and entering the insulation system.10.6.4 For vertical vessels and equipment less than 2.44 mdiameter, any finish of stainless steel jacketing or stainless steelTABLE 4 Minimum Overlap at Heel and Throat of Two-pieceElbowsInsulation O.D.mmMinimum Elbow Heel and
47、Throat Overlap,AmmUp to 60 1173 and up 16AAlso called the “tangent”.C1767M 16a5deep corrugated sheet is acceptable. For vertical vessels andequipment 2.44 m diameter and greater, deep corrugatedstainless steel sheet jacketing shall be used.10.7 The purchaser shall be aware that Grade 1 (T-304/T-304L
48、 alloy) is normally used in most applications except themost corrosive areas, where Grade 2 (T-316/T-316L) or Grade1, Type II, IV, or V is recommended.10.8 For all applications of stainless steel jacketing, thepurchaser shall select the Type (outer surface treatment) tomeet the required emittance an
49、d corrosion resistance.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 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,collectively, are det
