1、Designation: E 1975 06Standard Specification forShelter, Electrical, Equipment S-280/G1This standard is issued under the fixed designation E 1975; 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 (e) 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 m
3、obile 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 foll
4、owing 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 anddeterm
5、ine the applicability of regulatory limitations prior touse.2. Referenced Documents2.1 ASTM Standards:2C 273 Test Method for Shear Properties of Sandwich CoreMaterialsD 1621 Test Method for Compressive Properties Of RigidCellular PlasticsD 1622 Test Method for Apparent Density of Rigid CellularPlast
6、icsD 2842 Test Method for WaterAbsorption of Rigid CellularPlasticsE 864 Practice for Surface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter PanelsE 1730 Specification for Rigid Foam for Use in StructuralSandwich Panel CoresE 1749 Terminology Relating to Rigid Wall Reloca
7、tableSheltersE 1773 Practice for Sealing Rigid Wall Tactical Shelterswith Polysulfide Based SealantsE 1794 Specification forAdhesive for Bonding Foam CoredSandwich Panels (200F Elevated Humidity Service), TypeII PanelsE 1801 Practice for Adhesive Bonding of Aluminum Fac-ings in Foam and Beam Type Sh
8、eltersE 1851 Test Method for Electromagnetic Shielding Effec-tiveness of Durable Rigid Wall Relocatable StructuresE 1925 Specification for Engineering and Design Criteriafor Rigid Wall Relocatable Structures2.2 Commercial Standards:3SAE AMS-W-6858 Welding, Resistance: Spot and SeamSAEAMS-STD-1595 Qu
9、alification ofAircraft, Missile, andAerospace Fusion Welders2.3 Federal Air Regulation (FAR):FAR 25.853 Compartment Interior42.4 Military Standards:MIL-F-14072 Finishes for Ground Electronic Equipment5MIL-DTL-55507 Shelter, Electrical Equipment, (With orWithout Equipment), Packaging of5MIL-STD-202 E
10、lectronic and 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 ofProduct
11、6MIL-STD-2219 Fusion Welding for Aerospace Applica-tions6MIL-M-13231 Marking of Electronic Items52.5 Drawings:SC-D-36423 Hold Down Assembly6SC-D-36424 Cable Assembly6SC-C-200154 Keeper61This specification is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct re
12、sponsibility of Subcommittee E06.53on Materials and Processes for Durable Rigid Wall Relocatable Structures.Current edition approved Oct. 1, 2006. Published October 2006. Originallyapproved in 1998. Last previous edition approved in 2001 as E 1975 01a.2For referenced ASTM standards, visit the ASTM w
13、ebsite, 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.3Available from AMS Publications, Society of Automotive Engineers (SAE),400 Commonwealth Dr., Warrendale, PA
14、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.gov5Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-50
15、98, http:/www.dodssp.daps.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.SM-D-450462 Panel Assembly, Emergency Exit6SM-C-4
16、50466 Air Filter6SM-C-555515 Shock Mount6SM-B-563756 Sealer6SC-D-595509 Cover, Emergency Exit6SC-B-595564 Core Material-Urethane, Light6SC-B-595565 Core Material-Urethane, Heavy6SM-D-615264 Intake Louver Assembly6DL-SC-A-621051 Modification Kit, Radio Frequency Inter-ference, MK-1079/G6SM-D-781242 D
17、oor Fixture (S-280) Construction TightnessTest6SM-D-781243 Drain Fixture (S-280) Construction Tight-ness Test6SM-D-781244 S-280 Construction Tightness Test6DL-SM-B-947080 Shelter, Electrical EquipmentS-280C/G6SM-D-947080 Shelter, Electrical Equipment S-280C/G6SM-D-947081 Panel Assembly, Front6SM-D-9
18、47082 Panel Assembly, Rear6SM-D-947083 Panel Assembly, Roof6SM-D-947084 Panel Assembly, Floor6SM-D-947085 Panel Assembly, Side6SM-D-947141 Corner, Lifting Eye (Machining)6SM-D-947142 Corner, Towing Eye (Machining)6SM-D-947143 Casting, Lifting and Towing Eye6SM-D-947160 Door Jamb Assembly6SM-D-947166
19、 Door Assembly6SM-B-947179 Bonding Procedure6SM-B-947180 Cleaning Procedure6SM-D-947181 Flatness and Squareness Measurements6SM-B-947184 Adhesive6SM-D-947186 Test Weight Installation6SM-C-947230 Shock Mount6SM-D-947235 Mounting Bracket, Skid6SM-C-947237 Shock Mount6SM-D-947238 Skid Assembly617-1-327
20、4 Shelter, Electrical Equipment, S-280C/G(Shielded)63. 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 toge
21、ther. Delaminationsmay 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
22、severehandling 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 determinati
23、ons of 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,
24、 using 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
25、 the space 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 betwee
26、n other 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 termino
27、logy related to this specification is defined inTerminology E 1749.4. 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 w
28、ater absorptionproperties shall be in accordance with Specification E 1730 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 Specificat
29、ion E 1794 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 SealerTh
30、e shear strength 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 10.1.1Comp
31、ressive strength 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 pe
32、r 3 4.5 10.3.1SM-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 per SM-D-9471437.5.2 10.24.2E19750624.4.1 Low Temperature200 psi (1.4 MPa) when tested at65 6 5F (54 6 3C) (see 12.2.2 and Table
33、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 to 95
34、 %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 the sal
35、t 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 with
36、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 thereto a
37、nd 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 PracticeE 864 and Drawing SM-B-947180. The inspection and recordsmaintenance requirements of Practice E 864 and SM-B-947180 s
38、hall be met.Arc welded assemblies shall be cleaned toremove any scale, oxidation products, and excess flux. Anyacid used in cleaning shall be completely neutralized andremoved.5.2.2 OtherAll aluminum parts to be sealed at a sub-assembly or at final assembly shall be cleaned in accordancewith Practic
39、e E 864 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 t
40、o 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 we
41、lding 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 be
42、 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 produ
43、ction 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 voi
44、ds 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 tempera
45、ture 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 10.8Riveting
47、 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 10.22C
48、onstruction 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 latch
49、 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.E19750633.1.1 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 E 1801and S
