1、rI . II INCH-POUND IMIL-I-2781F21 Aumst 1991.SUPERSEDINGMIL-I-2781E7 October 1975(see 6.10)MILITARY SPECIFICATIONINSU?.ATION, PIPE, THERMALThis specification is approved for use by all Departments and Agenciesof the Department of Defense1. SCOPE1,1 -. This specification establishes the requirements
2、forpreformed thermal insulation for use on pipes at surface temperatures up to1200 degrees Fahrenheit (“F)2. APPLICABLE DOCUMENTS2.1 Government documents2,1.1 Specifications, standards . and handbooks The followingspecifications, star.dards, and handbooks form a part of this document co theextent sp
3、ecified herein. Unless otherwise specified, the issues of thesedocuments are those listed in the issue of the Department of Defense Index ofSpecifications and Standards (DoDISS) and supplement thereto, cited in thesolicitation (see 6.2)SPECIFICATIONSFEDERALPPP-F-320 - Fiberboard; Corrugated and Soli
4、d, SheetStock (Container Grade) , and Cut Shapes,MILITARYMIL-c-2861 - Cement, Insulation, Higt.Temperature.MIL-L-191L0 - Lumber and Plywood, Fire-RetardantTreated.IBeneficial comments (recommendations, additions, deletions) and any pertinentdata which may be of use in improving this document should
5、be addressed to:Commander, Naval Sea Systems Command, SEA 55Z3, Department of the Navy,Washington, DC 20362-5101 by using the self-addressed StandardizationDocument Improvement Proposal (DD Form 1426) appearing at the end of thisdocument or by letter.AMSC N/A FSC 5640DISTRIBUTION STATEMENT A. Approv
6、ed for public release ; distribution isunlimited.IProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. .MIL-I-2781FSTANDARDSFEDERALFED-STD-313 - Material Safety Data Transportation Data a71and Disposal Data for Hazardous MaterialsFurnished to Government
7、 Activities.MILITARYMIL-STD-1623 - Fire Performance Requirements and ApprovedSpecifications for Interior FinishMaterials and Furnishings (Naval ShipboardUse)MIL-sTD-2073-1 - DOD Materiel Procedures For DevelopmentAnd Application of Packaging Requirements.(Unless otherwise indicated, copies of federa
8、l and military specifi-cations and standards are available from the Standardization Documents OrderDesk, Bldg. 4D, 700 Robbins Avenue, Philadelphia , PA 19111-5094)2.2 Non-Government publications. The following documents form a partof this document to the extent specified herein. Unless otherwise sp
9、ecified,the issues of the documents which are DoD adopted are those listed in theissue of DoDISS cited in the solicitation. Unless otherwise specified, theissues of the documents not listed in the DoDISS are the issues of thedocuments cited in the solicitation (see 6.2)AMERICAN SOCIETY FOR TESTING A
10、ND MATERIALS (ASTM)C 302 - Standard Test Method for Density of PreformedPipe-Covering-Type Thermal Insulation,c 335 - Standard Test Method for Steady-State Heat oC 356 -c 411 -C 421 -C 446 -c U+9 -C 585 -D 3951 -Transfer Properties of Horizontal PipeInsulation.Standard Test Method for Linear Heat Sh
11、rinkageof Preformed High-Temperature Thermal InsulationSubjected to Soaking Heat.Standard Test Method for HoC-Surface Performanceof High-Temperature Thermal Insulation.Standard Test Method for Tumbling Friability ofPreformed Block-Type Thermal Insulation.Standard Test Method for Breaking Load andCal
12、culated Modulus of Rupture of PreformedInsulation for Pipes.Standard Specification for Mineral FiberHydraulic-Setting Thermal Insulating andFinishing Cement.Standard Practice for Inner and Outer Diametersof Rigid Thermal Insulation for Nominal Sizes ofPipe and Tubing (NPS System)Standard Practice fo
13、r Commercial Packaging. (DODadopted)(Application for copies should be addressed to the American Society forTesting and Materials, 1916 Race Street, Philadelphia, PA 19103.)2 a71Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-III2.3MIL-I-2781FOrder of
14、 Precedence. In the event of a conflict between the textof this document and the references cited herein (except for relatedassociated detail specifications, specification sheets, or MS standards) , thetext of this document takes precedence. Nothing in this document, however,supersedes applicable la
15、ws and regulations unless a specific exemption hasbeen,obtained.3. REQUIREMENTS3.1 g . The thermal pipe insulation furnished under thisspecification shall be products which are authorized by the qualifyingactivity for listing on the applicable qualified products list at the time ofaward of contract
16、(ee 4.3 and”6.4)3.2 Material. The thermal pipe insulation shall consist of heat-resisting compounds suitable for the temperature conditions and the purposeintended.3.2.1 Prohibited fibers. Neither asbestos nor ceramic (refractory)fibers nor materials containing any of these fibers shall be used in t
17、heinsulation (see 5.5).3.3 Form and dimensions3.3.1 Form and lenEth. Thermal pipe insulation in nominal pipe sizesup to and including 10 inches shall be furnished in sections 3 feet long,a71 split in half lengthwise. Pipe insulation for nominal pipe sizes larger than10 inches may be furnished in sem
18、i-cylindrical sections or as curved segments,3 feet in length. Each section or segment shall be true to shape and round-ness and shall fit standard iron pipe sizes. A tolerance of plus or minus 1/4inch in length will be permitted (see 4.5.2.1)3.3.2 . The inner diameter of the pipe insulation shallbe
19、 as specified in ASTM C 585 (see 4.5.2.2). The inner diameter of pipeinsulation listed in ASTM C 585 approximates the outer diameter of iron pipesizes. The insulation can be applied either to a pipe or as a second layer toa71a smaller size of pipe insulation.3.3.3 Thickness. Pipe insulation shall be
20、 furnished in the thicknesseslisted in ASTM C 585 as specified (see 6,2) A tolerance of plus l/8-inch orminus l/16-inch in actual thicknesses specified in ASTM C 585 will be per-mitted (see 4.5.2.3).3.4 Physical requirements Pipe insulation shall conform to therequirements specified in table 1.Provi
21、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IMIL-I-2781FTable 111. Physical requirementsPhysicalCharacteristics Test RequirementsDensity average, lb/ft3 maximum 4,5.3 15.0Thermal conductivity (average), 6.5,4Btu/hr. ft.2 deg F at meantemperature of:20
22、0”F 0.42300”F 0.45400”F500”F0.500.60600”F 0,65700”F 0.70Weight loss by tumbling, 4 5,5loss in weight (average)percent max.After first 10 minutes 20After second 10 minutes 40Modulus of rupture (average), 4,5.6 1/lb/in2 minimumChanges under soaking heat for 4,5.7 2.06 hours at 1200-F,Linear shrinkage
23、(average)percent, max.II firee times density (pounds per cubic foot (lbs/ft3) Of the samPletested.3.5 Simulative service, Thermal pipe insulation shall not warp, crackor show other visible changes. Minor surface cracks that do not propagatemore than l/4-inch internally from the hoc face surface of c
24、he pipe insulationshall be disregarded (see 4.5.9)3.6 Fire resistance and smoke density. The finished insulation shallconform to the fire resistance and smoke density requirements set forth inMIL-STD-1623 (see 4.5.8).3.7 Compatibility. The insulation material shall be compatible withthermal insulati
25、on cement conforming to ASTM C 449 and with high temperaturethermal insulating cement conforming to MIL-c-2861. Without the applicationof a primer, the cements shall readily adhere to the insulation segments andform a smooth, protective surface. Drying time for each cement afterapplication shall not
26、 exceed 2 hours (see 4,5.10)3.8 Appearance and workmanship. Insulation shall be free of defects inappearance and workmanship (see 4,5.2,4)4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-2781Fa713.9 Material safety data sheet (MSDS) The contrac
27、ting activity shallbe provided a material safety data sheet at the time of contract award. TheMSDS shall be provided in accordance with the requirements of FED-STD-313The MSDS shall be included with each shipment of the material covered by thisspecification (see 6.5)3.10 Recovered materials. Unless
28、otherwise specified herein, allmaterial incorporated in the products covered by this specification shall benew and may be fabricated using materials produced from recovered materials tothe maximum extent practicable with jeopardizing the intended use The term“recovered materials” means materials whi
29、ch have been collected or recoveredfrom solid waste and reprocessed to become a source of raw materials , asOppOsed to virgin raw materials None of che above shall be interpreted tomean that the use of used products ia allowed under this specification unlessotherwise specifically specified,3.11 Toxi
30、city. The material shall have no adverse effect on the healthof personnel when used for its intended purpose (see 6.1 and 6.6) Questionspertinent to this effect shall be referred by the contracting activity to theBureau of Medicine and Surgery (BUMED) who will act as an advisor to thecontracting act
31、ivity,4. QUALITY ASSURANCE PROVISIONSL.1 Responsibility for inspection. Unless otherwise specified in thecontract or purchase order, the contractor is responsible for the performanceof all inspection requirements (examinations and tests) as specified herein.Except as otherwise specified in the contr
32、act or purchase order , the con-tractor may use his or any other facilities suitable for the performance ofthe inspection requirements specified herein, unless disapproved by theGovernment, The Government reserves the right to perform any of the inspec-tions set forth in the specifications where suc
33、h inspections are deemednecessary to ensure supplies and services conform to prescribed requirements4.1.1 Responsibility for compliance. All items shall meet all require-ments of sections 3 and5, The inspection set forth in this specificationshall become a part of the contractor s overall inspection
34、 system or qualityprogram. The absence of any inspection requirements in the specificationshall not relieve the contractor of the responsibility of ensuring that allproducts or supplies submitted to the Government for acceptance comply withall requirements of the contract. Sampling inspection, as pa
35、rt of the manu-facturing operations , is an acceptable practice to ascertain conformance torequirements , however , this does not authorizematerial , either indicated or actual , nor doesaccept defective material4.2 Classification of inspections, Thespecified herein are classified as follows :(a) Qu
36、alification inspection (seesubmission of known defectiveit commit the Government toinspection requirements4.3)(bj Quality conformance inspection (sLe 4,4).5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. .MIL-I-2781F4.2,1 Inspection conditions Unle
37、ss otherwise specified (see 6.2), allinspections shall be performed in accordance with the conditions specifiedherein. a714.3 Qualification indirection. Qualification inspection shall consistof the examinations and tests listed in table II Qualification tests shallbe conducted at a laboratory satisf
38、actory to the Naval Sea Systems Command.Table II. Qualification inseccio”Inspection Requirement Test methodCertificationMaterial 3.2 and one sample for the tests of 4,5.4, 4.5,8, 4.5.9 and 4.5.10.4,3.2 Retention of qualification, The contractor shall conductqualification examinations and tests every
39、 3 years and shall submit theresults to the Naval Sea Systems Command (see 6.4)4.4 Oualitv conformance inspection. Quality conformance inspectionshall consist of the examinations and tests listed in table III (see 6,3)I6Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
40、ense from IHS-,-,-MIL-I-2781FTable III. Oualitv conformance inspection.Inspection Requirement Test methodCertificationMaterial 3.2 & 3,2.1 and visualDimensions 3.3 4.5.2Density 3.4 4,5.3Thermal conductivity 3.4 4.5.6Weight loss by tumbling 3.4 4,5.5Modulus of rupture 3.4 4.5,6Changes under soaking h
41、eat- (6 hrs 3.4 4.5.7aC 1200F), linear shrinkageFire resistance and smoke density 3.6 4.5,8Simulative performance 3,5 &.5.9Compatibility 3.7 4.5.10Material safety data sheet 3.9 .Appearance and workmanship 3.8 4.5.2.4Packaging 5.1 thru 5.4 -L.4,1 . For purposes of inspection sampling, a IOC is defin
42、ed asall insulation sections of one size produced in the same facilicy, under thesame conditions and from the same materials.4.4.2 Samulin for qualicv conformance insectioq. As a minimum, thecontractor shall select a sample quantity of insulation sections from each lotin accordance with table IV and
43、 subject the sample sections to the examina-tions and tests listed in table III. If one or more defects are found in anysampl, the entire lot shall be rejected. The contractor has the option ofscreening 100 percent of the lot for the defective characteristic(s) , orproviding a new lot which shall be
44、 inspected in accordance with the samplingplan herein.Table IV, Sampling for qualitw conformance inspection.!Lot size I Sample size2 to 25 326 to 50 551 to 90 691 to 150 7151 to 280 10281 co 500 11501 to 1200 151201 to 3200 183201 to 10000 2210001 and 6ver 29IProvided by IHSNot for ResaleNo reproduc
45、tion or networking permitted without license from IHS-,-,-. .MIL-I-2781F4.5 .4.5.1 Conditioning samples. Test specimens shall be conditioned by a71drying to constant weight in an oven at a temperature of 215-F to 250”F.& 5.2 Dimensions4.5.2.1 -. Length shall be determined in accordance with ASTM C30
46、2 (see 3.3.1).4.5.2.2 Diameter. The inner diameter of the pipe insulation shall bedetermined in accordance with ASTM C 585 (see 3,3.2)&,5.2.3 Thickness. Thickness shall be determined in accordance withASTM C 302 (see 3,3.3).4.5.2.4 Appearance and workmanship. The pipe insulation shall beexamined to
47、determine that none of the following defects exist (see 3.8):(a)(b)(c)(d)(e)(f)(g)(h)Cracked or broken lengthsFriable or lumpy surface.Inner core of insulation not concentric with outercylindrical surface.Edges not plane.Longitudinal cut surfaces not planeExcessive voidsWarping.Form not as required.
48、4.5.3 Density, The density shall be determined in accordance withASTM C 302 (see table I)4.5.4 Thermal conductivity, Thermal conductivity shall be determinedin accordance with ASTM C 335 (see table I)4.5.5 Weight loss by tumbling. Weight loss by tumbling shall bedetermined in accordance with ASTM C
49、421 (see table I).4,5.6 Modulus of ruvture. Modulus of rupture shall be determined inaccordance with ASTM C 446 (see table I)4.5.7 Phvsical chances after heat soaking. Specimens shall be weighedand measured. The specimens shall then be placed in an electrically heatedoven and subjected to 1200”F for 6 hours The specimens shall then be removedfrom the oven, cooled to room temperature , and tested to determine linearshrinkage in accordan
