1、Designation: C1767 13aC1767 14Standard 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.
2、A number 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 for thermal, acoustical, and fire protective insulation operating at eitherabove
3、or below ambient temperatures and in both indoor and outdoor locations. It does not cover insulation jacketing made fromother materials such as mastics, fiber reinforced plastic, PVC, aluminum, or coated carbon steel (for example, aluminum-zinc,galvanized steel, or aluminized steel) nor does it cove
4、r the details of thermal, acoustical, or fire protective insulation systems.1.2 While not intended to cover use inside the containment buildings of nuclear power plants, this standard does not precludeuse of Class E material which does not have a moisture barrier in this containment building applica
5、tion.1.3 This specification provides physical requirements for stainless steel jacketing for thermal and acoustical insulation. GuideC1423 provides guidance in selecting jacketing materials and their safe use.1.4 This is a material specification and does not imply any performance of the installed sy
6、stem using the materials specifiedherein. For information about installation of stainless steel jacketing, see (1).21.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only
7、 and are not considered standard.1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitatio
8、ns prior to use.2. Referenced Documents2.1 ASTM Standards:3A167 Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip (Withdrawn 2014)4A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels andfor
9、General ApplicationsA480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and StripC168 Terminology Relating to Thermal InsulationC450 Practice for Fabrication of Thermal Insulating Fitting Covers for NPS Piping, and Vessel LaggingC585 Pra
10、ctice for Inner and Outer Diameters of Thermal Insulation for Nominal Sizes of Pipe and TubingC835 Test Method for Total Hemispherical Emittance of Surfaces up to 1400CC1371 Test Method for Determination of Emittance of Materials Near Room Temperature Using Portable EmissometersC1423 Guide for Selec
11、ting Jacketing Materials for Thermal InsulationC1729 Specification for Aluminum Jacketing for InsulationC1785 Test Method for Concentration of Pinhole Detections in Moisture Barriers on Metal JacketingE84 Test Method for Surface Burning Characteristics of Building MaterialsF1249 Test Method for Wate
12、r Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor3. Terminology3.1 DefinitionsDefinitions in Terminology C168 apply to terms used in this specification.3.2 Definitions of Terms Specific to This Standard:1 This test method is under the jurisdiction ofASTM C
13、ommittee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.40 on Insulation Systems.Current edition approved Sept. 1, 2013April 1, 2014. Published October 2013April 2014. Originally approved in 2012. Last previous edition approved in 2013 asC176713.13a. DOI: 10.1520/C176
14、7-13A.10.1520/C1767-14.2 The boldface numbers in parentheses refer to the list of references at the end of this standard.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer
15、 to the standards Document Summary page on the ASTM website.4 The last approved version of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the pre
16、vious version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM I
17、nternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 box ribstainless steel sheet formed to have alternating parallel grooves and ridges with a cross section approximatinga square wave.3.2.2 cladding (as related to insulation jacketing)synonymous wi
18、th jacketing.3.2.2.1 DiscussionThe three terms “jacketing”, “lagging”, and “cladding” are considered synonymous in most applications and geographies.However, in some cases in the power industry in North America the term “lagging” has a different meaning than “jacketing” or“cladding” and refers speci
19、fically to a heavier gauge of jacketing.3.2.3 crevice corrosionlocalized corrosion of metal jacketing surface at, or immediately adjacent to an area that is shieldedfrom full exposure to the environment because of close proximity between the metal and the surface of another material.3.2.3.1 Discussi
20、onThis definition is taken from the ASTM Committee G01 on Corrosion of Metal.3.2.4 cross crimpedsynonymous with 316 in. corrugated.3.2.5 deep corrugatedstainless steel sheet formed to have alternating parallel grooves and ridges with a cross sectionapproximating a sine wave.3.2.6 gorejacketing for e
21、lbows, fittings, or other non-straight portions of the piping system made from a multitude of similaroverlapping 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 mo
22、st applications and geographies.However, in some cases in the power industry in North America the term “lagging” has a different meaning than “jacketing” or“cladding” and refers specifically to a heavier gauge of jacketing.3.2.8 mill finishthe appearance of the stainless steel surface as supplied fr
23、om the metal mill.3.2.9 moisture retarder (moister barrier)a layer of plastic film or other material applied to the inner side of metal jacketingto inhibit jacket corrosion by interfering with the formation of a galvanic cell between the dissimilar metals of the pipe and jacketor by preventing crevi
24、ce corrosion.3.2.9.1 DiscussionA moisture retarder is not an insulation system water vapor retarder and does not perform the same function.3.2.10 polykrafta multilayer composite film used as a moisture retarder on metal jacketing consisting of at least one layer ofminimum 40 lb Kraft paper and one o
25、r more layers of plastic film, usually polyethylene at a minimum thickness of 1.5 mils.3.2.10.1 DiscussionKraft paper is commonly referred to by its basis weight which is the mass per area in units of lbs/3000 ft2. In Metric units, thismass per area is called the grammage and is in units of g/m2. 40
26、 lb Kraft has a basis weight of 40 lbs/3000 ft2 and a grammageof 65 g/m2.3.2.11 polysurlyna multilayer film used as a moisture retarder on metal jacketing consisting of at least one layer ofethylene/methacrylic acid copolymer and one or more layers of other polymers, usually polyethylene.3.2.12 safe
27、ty edgean edge of metal jacketing that has been de-burred or rounded by a rolling operation.3.2.13 safety hema rounded edge of metal jacketing created by folding the edge of sheet jacketing completely back upon itselfusing a roll former or a brake.3.2.13.1 Discussionthe fold is typically made toward
28、 the underside of the jacketing so that the original edge is hidden and the external appearance ofthe jacketing is preservedC1767 1423.2.14 splice rollmetal jacketing sold in roll form where the package contains two separate pieces of metal jacketing rolledapproximately end to end.3.2.14.1 Discussio
29、nA splice roll occurs when the metal coil being used to form the roll jacketing reaches its end before the required roll length isobtained.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
30、.4. Significance and Use4.1 This specification is used to specify material by physical property requirements that address the prerequisites in Sections6 to 10. The designer of an insulation system, after determining the system requirements, shall use this specification to specify theappropriate stai
31、nless steel jacketing.5. Classification5.1 Classification of stainless steel jacketing is based on three 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 tempe
32、r5.1.2.2 Grade 2 = Alloy T-316/T-316L, annealed temperNOTE 1The four allowable alloys shown in 5.1.2 are of the austenitic type 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 by welding,a low carbo
33、n alloy is required on those rare occasions when the stainless steel jacketing will be subjected to direct welding or the heat from welding nearbymetal. The low carbon and standard alloys are considered interchangeable for use as insulation jacketing.5.1.3 Moisture Retarder:5.1.3.1 Class A = polysur
34、lyn, 3 mil thick5.1.3.2 Class C = polykraft per section 3.2.105.1.3.3 Class E = no moisture retarderNOTE 3Classes B straight pipe, pipe elbows/fittings, andvessels/equipment. The requirements for each of these applications differ.10.3 Stainless Steel Jacketing on Straight Pipe:10.3.1 At the point of
35、 application, stainless steel jacketing used on straight pipe will consist of a multitude of pre-curved pieceswith dimensions per 8.2.10.3.2 The thickness (gauge) used for the stainless steel jacketing on straight pipe varies with jacket diameter as shown in thissection and in Table 1.10.3.2.1 For s
36、traight pipe up to a jacket diameter of 24 in. (610 mm), the minimum allowable thickness is 0.010 in. (0.25 mm)and Grade 1 or Grade 2 stainless steel shall be used.10.3.2.2 For straight pipe with jacket diameter greater than 24 in. (610 mm) up to 36 in. (914 mm), the minimum allowablethickness is 0.
37、016 in. (0.4 mm) and Grade 1 or Grade 2 stainless steel shall be used.10.3.2.3 For straight pipe with a jacket diameter greater than 36 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 sever
38、e, consideration shall be given to using thickness of 0.024 in. (0.6 mm) or greater.Grade 1 or Grade 2 stainless steel shall be used.10.3.4 Stainless steel jacketing on straight pipe requires the use of a moisture retarder so only Classes A or C shall be used.10.4 Stainless Steel Jacketing on Pipe E
39、lbow/Fittings:10.4.1 Stainless steel jacketing applied to insulation on pipe elbows/fittings shall take the form of 2-piece (pressed), 4-piece,or gores all of which shall be pre-formed or pre-rolled to fit around the insulation. For outer insulation diameters of 20 in. (508mm) or larger, the use of
40、8-piece sections on pipe elbows/fittings is acceptable.10.4.1.1 For 2-piece (pressed) elbows, the overlaps at the heel and throat shall comply with the minimum values in Table 4 whenthe insulation outer diameter conforms to the target values in Practices C585 or C450.NOTE 10When the insulation outer
41、 diameter is smaller or larger than that specified in Practices C585 or C450, the heel and throat overlaps will belarger or smaller than 5/8 in. (16 mm). With 2-piece (pressed) elbows, deviations in insulation outer diameter from that specified in Practices C585 orC450 causes, in some cases, undesir
42、able 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. (0.4 mm) thick.10.5 Stainless Steel Jacketing on Equipment and Vessels:10.5.1 Except for the thickness, finish, and Grade requirements in 10.5.2 to 10.5.4, stainless
43、steel jacketing applied to equipmentand vessels shall be of any size and shape agreed upon by purchaser and seller.10.5.2 The minimum allowable stainless steel jacketing thickness shall be as listed in Table 1.10.5.3 For horizontal vessels, only smooth or stucco embossed finish shall be used (no dee
44、p corrugated sheet or 316 in.corrugated finish).NOTE 11When deep corrugated or 316 in. corrugated sheet is used on horizontal vessels, there is a tendency for water to pond in the corrugationson the top of the vessel resulting in an increase in jacket corrosion, more dirt collection, poorer aestheti
45、cs, and an increased likelihood of water penetratingthe 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 or stainless steeldeep corrugated sheet is acceptable. For vertical vessels and equipm
46、ent 8 ft (2.44 m) 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 most applications except the mostcorrosive areas, where Grade 2 (T-316/T-316L) is recommended.TABLE 4 Minimum O
47、verlap at Heel and Throat of Two-pieceElbowsInsulation O.D.inches (mm)Minimum Elbow Heel andThroat Overlap,A inches (mm)Up to 2.375 (60.3) 0.4375 (11.1)2.875 (73.0) and up 0.625 (15.9)A Also called the “tangent”.C1767 14611. Test Methods11.1 Outer Jacket Surface EmittanceTest in accordance with Test
48、 Method C835 or C1371.11.2 Surface Burning CharacteristicsTest in accordance with Test Method E84 with outer surface of jacketing exposed to theflames.11.3 Metal Sheet ThicknessTest in accordance with Specification A480/A480M.11.4 Pinholes Pinhole Detections in Moisture RetarderTest in accordance wi
49、th the procedure contained in Specification TestMethod C1729C1785, section 11.411.4.1 Pass CriteriaThe moisture retarder is considered acceptable when no more than 5 pinholes, pinhole detections,collectively, are detected in the 10 wetted test areas.11.5 Water Vapor Transmission Rate of the Moisture RetarderTest in accordance with Test Method F1249 at 73F (22.8C)and 100 % relative humidity with results normalized to 1 atmosphere of pressure.12. Sampling, Inspection, and Rejection of Defective Material12.1 A lot of material shall be con
