1、Designation: E1975 09Standard Specification forShelter, Electrical, Equipment S-280/G1This standard is issued under the fixed designation E1975; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in
2、 parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers one type of lightweight fieldand mobi
3、le shelter designed for transport by cargo truck, fixedor rotary winged aircraft, by rail, and ship, as Shelter, ElectricalEquipment S-280/G (see 15.5).1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 The followi
4、ng safety hazards caveat refers only to thetest methods described in this specification. This standard doesnot purport to address the safety concerns, if any, associatedwith its use. It is the responsibility of the user of the standardto establish appropriate safety and health practices anddetermine
5、 the applicability of regulatory limitations prior touse.2. Referenced Documents2.1 ASTM Standards:2C273 Test Method for Shear Properties of Sandwich CoreMaterialsD1621 Test Method for Compressive Properties Of RigidCellular PlasticsD1622 Test Method for Apparent Density of Rigid CellularPlasticsD28
6、42 Test Method for Water Absorption of Rigid CellularPlasticsE864 Practice for Surface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter PanelsE1730 Specification for Rigid Foam for Use in StructuralSandwich Panel CoresE1749 Terminology Relating to Rigid Wall RelocatableShel
7、tersE1773 Practice for Sealing Rigid Wall Tactical Shelterswith Polysulfide Based SealantsE1794 Specification for Adhesive for Bonding Foam CoredSandwich Panels (200F Elevated Humidity Service), TypeII PanelsE1801 Practice for Adhesive Bonding of Aluminum Fac-ings in Foam and Beam Type SheltersE1851
8、 Test Method for Electromagnetic Shielding Effec-tiveness of Durable Rigid Wall Relocatable StructuresE1925 Specification for Engineering and Design Criteria forRigid Wall Relocatable Structures2.2 Commercial Standards:3SAE AMS-W-6858 Welding, Resistance: Spot and SeamSAEAMS-STD-1595 Qualification o
9、fAircraft, Missile, andAerospace Fusion Welders2.3 Federal Air Regulation (FAR):4FAR 25.853 Compartment Interior2.4 Military Standards:MIL-F-14072 Finishes for Ground Electronic Equipment5MIL-DTL-55507 Shelter, Electrical Equipment, (With orWithout Equipment), Packaging of5MIL-STD-202 Electronic and
10、 Electrical Component Parts5MIL-STD-252 Wired Equipment, Classification of Visualand Mechanical Defects for Equipment, Electronic,Wired, and Other Devices5MIL-STD-810 Environmental Engineering Considerationsand Laboratory Tests5MIL-STD-1916 DOD Preferred Methods for Acceptance ofProduct6MIL-STD-2219
11、 Fusion Welding for Aerospace Applica-tions6MIL-M-13231 Marking of Electronic Items52.5 Drawings:6SC-D-36423 Hold Down AssemblySC-D-36424 Cable Assembly1This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.
12、53on Materials and Processes for Durable Rigid Wall Relocatable Structures.Current edition approved Nov. 1, 2009. Published December 2009. Originallyapproved in 1998. Last previous edition approved in 2006 as E1975 06. DOI:10.1520/E1975-09.2For referenced ASTM standards, visit the ASTM website, www.
13、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.3Available from AMS Publications, Society of Automotive Engineers, SAEInternational (SAE), 400 Commonwealth Dr., Warrenda
14、le, PA 15096-0001, http:/www.sae.org.4Available from Flight Standards Service, Federal Aviation Administration(FAA), 800 Independence Ave., SW, Washington, DC 20591, http:/www.faa.gov.5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA
15、19111-5098, http:/dodssp.daps.dla.mil.6Available from US Army Natick Soldier Center, ATTN: AMSRD-NSC-CP-CS,Kansas Street, Natick, MA 01760-5018.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.SC-C-200154 KeeperSM-D-450462 Panel Assem
16、bly, Emergency ExitSM-C-450466 Air FilterSM-C-555515 Shock MountSM-B-563756 SealerSC-D-595509 Cover, Emergency ExitSC-B-595564 Core Material-Urethane, LightSC-B-595565 Core Material-Urethane, HeavySM-D-615264 Intake Louver AssemblyDL-SC-A-621051 Modification Kit, Radio Frequency Inter-ference, MK-10
17、79/GSM-D-781242 Door Fixture (S-280) Construction TightnessTestSM-D-781243 Drain Fixture (S-280) Construction Tight-ness TestSM-D-781244 S-280 Construction Tightness TestDL-SM-B-947080 Shelter, Electrical Equipment S-280C/GSM-D-947080 Shelter, Electrical Equipment S-280C/GSM-D-947081 Panel Assembly,
18、 FrontSM-D-947082 Panel Assembly, RearSM-D-947083 Panel Assembly, RoofSM-D-947084 Panel Assembly, FloorSM-D-947085 Panel Assembly, SideSM-D-947141 Corner, Lifting Eye (Machining)SM-D-947142 Corner, Towing Eye (Machining)SM-D-947143 Casting, Lifting and Towing EyeSM-D-947160 Door Jamb AssemblySM-D-94
19、7166 Door AssemblySM-B-947179 Bonding ProcedureSM-B-947180 Cleaning ProcedureSM-D-947181 Flatness and Squareness MeasurementsSM-B-947184 AdhesiveSM-D-947186 Test Weight InstallationSM-C-947230 Shock MountSM-D-947235 Mounting Bracket, SkidSM-C-947237 Shock MountSM-D-947238 Skid Assembly17-1-3274 Shel
20、ter, Electrical Equipment, S-280C/G(Shielded)3. Terminology3.1 Definitions:3.1.1 delaminationsfor the purpose of this specification, adelamination is defined as the condition that exists within ashelter section or panel when two surfaces that once werebonded together are no longer bonded together. D
21、elaminationsmay occur between any two bonded surfaces, examples in-clude: separations between thermal barriers and members,between thermal barriers and skins, between members andcore, or between skins and core. They may be the result of apoor quality bond or they could occur due to misuse or severeh
22、andling of the panels or the shelter after bonding. Testrequirements of this specification shall not be construed asmisuse or severe handling as these terms apply to the definitionof delaminations (see 5.4).3.1.2 examinationexamination consists of simple, gener-ally nondestructive determinations of
23、compliance, without theuse of special testing equipment.3.1.3 inspectioninspection is the examination or testing,or both, of supplies to determine compliance with the appli-cable requirements. Sampling is an element of inspection.3.1.4 testingtesting consists of determinations of compli-ance, using
24、technical means.3.1.5 voidsfor the purpose of this specification, a void isdefined as any unauthorized separation or space within ashelter panel or section, that is, any separation or space that isin conflict with the drawings or other contractual requirements.Voids range from gaps as wide as the sp
25、ace created by amissing piece of core material to as thin as a break in thecontinuity of material. Voids may be located solely within onetype of material, such as a core material separation; they mayexist between adjacent materials, such as unbonded corematerial; or they may be located between other
26、 parts within apanel, such as where a piece of material is missing, damaged,or undersized. Voids may have been created at the time ofconstruction, such as where a part was omitted; or may becreated at a later time, such as a core separation or delaminatedskin (see 5.4).NOTE 1All other terminology re
27、lated to this specification is defined inTerminology E1749.4. Material Requirements4.1 GeneralMaterials used in the construction of this itemshall be in accordance with the following requirements:4.2 Core MaterialCore material density, compressivestrength, shear strength, flammability, and water abs
28、orptionproperties shall be in accordance with Specification E1730 andDrawings SC-B-595564 and SC-B-595565, as applicable (see12.2.1, 10.1, Table 1, and Table 2).4.3 AdhesiveThe shear strength of the cured adhesive andits bond to aluminum shall be in accordance with requirementsof Specification E1794
29、 and the Drawing SM-B-947184. Thisrequirement shall apply to the low temperature, room tempera-ture, and high temperature conditions and after the humidityexposure and salt spray exposure conditions required bySM-B-947184 (see 12.2.2, 12.2.3, 10.2, 10.2.2, Table 1, andTable 2).4.4 SealerThe shear st
30、rength of the cured sealer and itsbond to aluminum shall be in accordance with the following(see 10.2, 10.2.2, Table 1, and Table 2):TABLE 1 First Article SpecimensInspection QuantityRequirementsSubsectionTestSubsectionCore material: 4.2 10.1Density 5 for every grade or type 4.2 10.1.1Compressive st
31、rength 5 for every grade or type 4.2 10.1.2Shear strength 5 for every grade or type 4.2 10.1.3Flammability 5 for every grade or type 4.2 10.1.4Water absorption 3 for every grade or typeof urethane4.2 10.1.5Adhesive 50 coupons 4.3 10.2Sealer 50 coupons 4.4 10.2Shock mounts SM-C-555515: 3 per 3 4.5 10
32、.3.1SM-C-947237: 3 eachSM-C-947230: 3 eachImpact panel 1 from wall, 1 from floor 5.4.1 10.7Hold down assembly 1 complete 9.2 10.32Eye casting hardness 1 casting in accordancewith SM-D-9471437.5.2 10.24.2E1975 0924.4.1 Low Temperature200 psi (1.4 MPa) when tested at65 6 5F (54 6 3C) (see 12.2.2 and T
33、able 2),4.4.2 Room Temperature200 psi (1.4 MPa) when tested at80 6 10F (27 6 6C) (see 12.2.3 and Table 2),4.4.3 High Temperature75 psi (75 KPa) when tested at200+05F(93+03C) (see 12.2.2 and Table 2),4.4.4 Sealer Shear, Humidity ExposureThe sealer and itsbond to the aluminum shall withstand exposure
34、to 95 %relative humidity 65 % at 160 6 5F (71 6 3C) for fourteendays. After exposure the sealer shall have a minimum averageshear strength of 75 psi (520 KPa) when tested at 160 6 5F(71 6 3C).4.4.5 Sealer Shear, Salt Spray ExposureThe sealer and itsbond to the aluminum shall withstand exposure to th
35、e salt spraytest. Method 509.4 of MIL-STD-810F using a 20 % NaClsolution at 95 6 5F (35 6 3C) for fourteen days. Afterexposure the sealer shall have a minimum average shearstrength of 200 psi (1.4 MPa) when tested at 180 6 10F (276 6C).4.5 Shock MountsShelter skid shock mounts shall be inaccordance
36、with Drawing SM-C-555515, SM-C-947237, andSM-C-947230 (see 12.2.4, 10.3, 10.3.1, 10.3.2, Table 1, andTable 3).5. Construction Requirements5.1 GeneralThe electromagnetic protected shelter shallbe constructed in accordance with Drawing 1713274 and allsubsidiary drawings and parts lists pertaining ther
37、eto and asspecified herein.5.2 CleaningSee 12.2.5, 10.4, Table 2, and Table 3.5.2.1 Welding and BondingAll aluminum parts to bewelded or bonded shall be cleaned in accordance with PracticeE864 and Drawing SM-B-947180. The inspection and recordsmaintenance requirements of Practice E864 and SM-B-94718
38、0shall be met.Arc welded assemblies shall be cleaned to removeany scale, oxidation products, and excess flux.Any acid used incleaning shall be completely neutralized and removed.5.2.2 OtherAll aluminum parts to be sealed at a sub-assembly or at final assembly shall be cleaned in accordancewith Pract
39、ice E864 and SM-B-947180. Part drawings whichcite a specific finish in accordance with MIL-F-14072 shall becleaned as required therein. After assembly the shelter shall befree from particles or scale, flux, excess adhesive, excesssealer, and other foreign material. The shelter shall be cleanedprior
40、to application of finish.5.3 WeldingAll welds shall have thorough penetration andgood fusion and shall be free from splatter, scabs, blisters,abnormal pock marks, cracks, voids, slag inclusions, and otherdefects. Welders shall be certified in accordance with SAEAMS-STD-1595. Inert gas shielded arc w
41、elding shall be usedfor welding of aluminum in accordance with the drawings,except where resistance welding is specified (see 12.2.6, 10.5,Table 2, and Table 3).5.3.1 Arc WeldingExcept where required on the shelterdrawings, welded joints shall not require grinding of thefinished weld and shall not b
42、e ground. Welding to repaircastings shall not be permitted.5.3.2 Resistance WeldingResistance welding shall be inaccordance with Class B SAE AMS-W-6858. Qualification ofwelding machines and certification of welding schedules inaccordance with SAE AMS-W-6858 is required prior to firstarticle and prod
43、uction welding. Failure of any productionspecimen or any production part to meet the requirements ofSAE AMS-W-6858 shall be cause for rejection of the produc-tion quantity represented by that specimen or part.5.4 LaminationThe roof, floor, door, and each wall of theshelter shall be bonded without vo
44、ids or delaminations (seeTABLE 2 In-Process InspectionInspectionRequirementsSubsectionSamplingSubsectionTestSubsectionCore material: 4.2 . 10.1Density 4.2 12.2.1 10.1.1Compressive strength 4.2 12.2.1 10.1.2Shear strength 4.2 12.2.1 10.1.3Adhesive: 4.3 . 10.2Low temperature 4.3 12.2.2 10.2Room temper
45、ature 4.3 12.2.3 10.2High temperature 4.3 12.2.2 10.2Sealer: 4.4 . 10.2Low temperature 4.4.1 12.2.2 10.2Room temperature 4.4.2 12.2.3 10.2High temperature 4.4.3 12.2.2 10.2Shock mounts 4.5 12.2.4 10.3.2Cleaning 5.2 12.2.5 10.4Welding 5.3 12.2.6 10.5Lamination 5.4 12.2.7 10.6Interchangeability 5.6 12
46、.2.8 10.8Riveting 5.7 12.2.9 10.9Eye casting hardness 7.5.2 12.2.10 10.24.2Construction tightness,shelter8.2 12.2.11 10.10.1TABLE 3 Sequence of First Article InspectionInspectionRequirementsSubsectionTestSubsectionCleaning 5.2 10.4Welding 5.3 10.5Lamination 5.4 10.6Interchangeability 5.6 10.8Rivetin
47、g 5.7 10.9Construction tightness 8.2 10.10Finish 5.8 10.11Marking 5.9 10.12Dimensional 5.1 10.13Visual and mechanical 9.3 10.14Shelter weight 5.10 10.15Door latch torque 8.3 10.16Moisture resistanceA6.2 10.17Temperature 6.3 10.18Thermal differential 6.4 10.19Rail transport 7.2.1 10.21Drops 7.3 10.22
48、Construction tightnessB,C8.2 10.10.1Towing, simulated 7.4 10.23Eye pulls 7.5.1 10.24.1Air transport, simulated 7.2.2 10.25Static door load 7.6 10.26Roof access steps 7.7 10.27Light tightness 8.4 10.28Electromagnetic interference suppression 8.5 10.29Watertightness 8.6 10.30Fording 8.7 10.31Door latc
49、h torque (second time) 8.3 10.16AFirst article specimen testing shall be completed no later than the end of thistest (see 11.1.1).BFor correlation data purposes only. CTT test results are not to be used asaccept/reject criteria for the drop test.CDoor portion and gasket portion only.E1975 0933.1.1 and 3.1.5) to the inner and outer skins and other adjacentsurfaces. No voids shall exist between the inner and outersurfaces of the panels due to foam breaks, misfits, or lack ofadhesive. Bonding shall be in accordance with Practice E1801a
