1、Designation: E1975 09E1975 15Standard 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 n
2、umber in 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 U.S. Department of Defense.1. Scope1.1 This specification covers one type of lightweight
3、field and mobile shelter designed for transport by cargo truck, fixed orrotary winged aircraft, by rail, and ship, as Shelter, Electrical Equipment S-280/G (see 15.5).1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for informationonly
4、.mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 The following safety hazards caveat refers only to the test methods described in this specification.This standard does notpurport to address the safety concerns, if any, associated with i
5、ts use. It is the responsibility of the user of the standard to establishappropriate safety and health practices and determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C273C273/C273M Test Method for Shear Properties of Sandwich Core Material
6、sD1621 Test Method for Compressive Properties of Rigid Cellular PlasticsD1622D1622/D1622M Test Method for Apparent Density of Rigid Cellular PlasticsD2842 Test Method for Water Absorption of Rigid Cellular PlasticsE631 Terminology of Building ConstructionsE864 Practice for Surface Preparation of Alu
7、minum Alloys to Be Adhesively Bonded in Honeycomb Shelter PanelsE1730 Specification for Rigid Foam for Use in Structural Sandwich Panel CoresE1749 Terminology Relating to Rigid Wall Relocatable SheltersE1773 Practice for Sealing Rigid Wall Tactical Shelters with Polysulfide Based SealantsE1794 Speci
8、fication forAdhesive for Bonding Foam Cored Sandwich Panels (200F Elevated Humidity Service), Type II PanelsE1801 Practice for Adhesive Bonding of Aluminum Facings in Foam and Beam Type SheltersE1851 Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
9、E1925 Specification for Engineering and Design Criteria for Rigid Wall Relocatable Structures2.2 Commercial Standards:3SAE AMS-W-6858 Welding, Resistance: Spot and SeamSAE AMS-STD-1595 Qualification of Aircraft, Missile, and Aerospace Fusion Welders2.3 Federal Air Regulation (FAR):4FAR 25.853 Compar
10、tment Interior2.4 Military Standards:MIL-F-14072 Finishes for Ground Electronic Equipment5MIL-DTL-55507 Shelter, Electrical Equipment, (With or Without Equipment), Packaging of5MIL-STD-202 Electronic and Electrical Component Parts51 This specification is under the jurisdiction of ASTM Committee E06
11、on Performance of Buildings and is the direct responsibility of Subcommittee E06.53 on Materialsand Processes for Durable Rigidwall Relocatable Structures.Current edition approved Nov. 1, 2009May 1, 2015. Published December 2009August 2015. Originally approved in 1998. Last previous edition approved
12、 in 20062009as E1975 06.E1975 09. DOI: 10.1520/E1975-09.10.1520/E1975-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the A
13、STM website.3 Available fromAMS Publications, Society ofAutomotive Engineers, SAE International (SAE), 400 Commonwealth Dr.,Warrendale, PA15096-0001, http:/www.sae.org.4 Available from Flight Standards Service, Federal Aviation Administration (FAA), 800 Independence Ave., SW, Washington, DC 20591, h
14、ttp:/www.faa.gov.5 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA19111-5098, http:/dodssp.daps.dla.mil.19111-5094, http:/quicksearch.dla.mil.This document is not an ASTM standard and is intended
15、 only to provide the user of an ASTM standard an indication of what changes have been made to the previous 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 v
16、ersionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1MIL-STD-252 Wired Equipment, Classification of Visual and Mechanical Defects for Equipment, Electroni
17、c, Wired, and OtherDevices5MIL-STD-810 Environmental Engineering Considerations and Laboratory Tests5MIL-STD-1916 DOD Preferred Methods for Acceptance of Product6MIL-STD-2219 Fusion Welding for Aerospace Applications6MIL-M-13231 Marking of Electronic Items52.5 Drawings:6SC-D-36423 Hold Down Assembly
18、SC-D-36424 Cable AssemblySC-C-200154 KeeperSM-D-450462 Panel Assembly, 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-
19、SC-A-621051 Modification Kit, Radio Frequency Interference, MK-1079/GSM-D-781242 Door Fixture (S-280) Construction Tightness TestSM-D-781243 Drain Fixture (S-280) Construction Tightness TestSM-D-781244 S-280 Construction Tightness TestDL-SM-B-947080 Shelter, Electrical Equipment S-280C/GSM-D-947080
20、Shelter, Electrical Equipment S-280C/GSM-D-947081 Panel Assembly, 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 Cas
21、ting, Lifting and Towing EyeSM-D-947160 Door Jamb AssemblySM-D-947166 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, S
22、kidSM-C-947237 Shock MountSM-D-947238 Skid Assembly17-1-3274 Shelter, Electrical Equipment, S-280C/G (Shielded)3. Terminology3.1 Definitions:3.1.1 delaminationsfor the purpose of this specification, a delamination is defined as the condition that exists within a sheltersection or panel when two surf
23、aces that once were bonded together are no longer bonded together. Delaminations may occurbetween any two bonded surfaces, examples include: separations between thermal barriers and members, between thermal barriersand skins, between members and core, or between skins and core. They may be the resul
24、t of a poor quality bond or they couldoccur due to misuse or severe handling of the panels or the shelter after bonding. Test requirements of this specification shall notbe construed as misuse or severe handling as these terms apply to the definition of delaminations (see 5.4).3.1.2 examinationexami
25、nation consists of simple, generally nondestructive determinations of compliance, without the use ofspecial testing equipment.6 Available from USArmy Natick Soldier Systems Center,ATTN:AMSRD-NSC-CP-CS, Kansas Street, Natick, MA01760-5018.01760-5018, http:/www.army.mil/natick.E1975 1523.1.3 inspectio
26、ninspection is the examination or testing, or both, of supplies to determine compliance with the applicablerequirements. Sampling is an element of inspection.3.1.4 testingtesting consists of determinations of compliance, using technical means.3.1.5 voidsfor the purpose of this specification, a void
27、is defined as any unauthorized separation or space within a shelter panelor section, that is, any separation or space that is in conflict with the drawings or other contractual requirements. Voids range fromgaps as wide as the space created by a missing piece of core material to as thin as a break i
28、n the continuity of material. Voids maybe located solely within one type of material, such as a core material separation; they may exist between adjacent materials, suchas unbonded core material; or they may be located between other parts within a panel, such as where a piece of material is missing,
29、damaged, or undersized. Voids may have been created at the time of construction, such as where a part was omitted; or may becreated at a later time, such as a core separation or delaminated skin (see 5.4).NOTE 1All other terminology related to this specification is defined in TerminologyTerminologie
30、s E631 and E1749.4. Material Requirements4.1 GeneralMaterials used in the construction of this item shall be in accordance with the following requirements:4.2 Core MaterialCore material density, compressive strength, shear strength, flammability, and water absorption propertiesshall be in accordance
31、 with Specification E1730 and Drawings SC-B-595564 and SC-B-595565, as applicable (see 12.2.1, 10.1,Table 1, and Table 2).4.3 AdhesiveThe shear strength of the cured adhesive and its bond to aluminum shall be in accordance with requirements ofSpecification E1794 and the Drawing SM-B-947184. This req
32、uirement shall apply to the low temperature, room temperature, andhigh temperature conditions and after the humidity exposure and salt spray exposure conditions required by SM-B-947184 (see12.2.2, 12.2.3, 10.2, 10.2.2, Table 1, and Table 2).4.4 SealerThe shear strength of the cured sealer and its bo
33、nd to aluminum shall be in accordance with the following (see 10.2,10.2.2, Table 1, and Table 2):4.4.1 Low Temperature200 psi (1.4 MPa) when tested at 65 6 5F (54 6 3C) (see 12.2.2 and Table 2),4.4.2 Room Temperature200 psi (1.4 MPa) when tested at 80 6 10F (27 6 6C) (see 12.2.3 and Table 2),4.4.3 H
34、igh Temperature75 psi (75 KPa)kPa) when tested at 200 + 0 200 + 0 5F (93 +0 3C) (see 12.2.2 and Table 2),4.4.4 Sealer Shear, Humidity ExposureThe sealer and its bond to the aluminum shall withstand exposure to 95 % relativehumidity 65 % at 160 6 5F (71 6 3C) (71 6 3C) for fourteen days. After exposu
35、re the sealer shall have a minimum averageshear strength of 75 psi (520 KPa)kPa) when tested at 160 6 5F (71 6 3C).(71 6 3C).4.4.5 Sealer Shear, Salt Spray ExposureThe sealer and its bond to the aluminum shall withstand exposure to the salt spraytest. Method 509.4 of MIL-STD-810F using a 20 % NaCl s
36、olution at 95 6 5F (35 6 3C) for fourteen days. After exposure thesealer shall have a minimum average shear strength of 200 psi (1.4 MPa) when tested at 180 6 10F (27 6 6C).(27 6 6C).4.5 Shock MountsShelter skid shock mounts shall be in accordance with Drawing SM-C-555515, SM-C-947237, andSM-C-94723
37、0 (see 12.2.4, 10.3, 10.3.1, 10.3.2, Table 1, and Table 3).5. Construction Requirements5.1 GeneralThe electromagnetic protected shelter shall be constructed in accordance with Drawing 1713274 and allsubsidiary drawings and parts lists pertaining thereto and as specified herein.5.2 CleaningSee 12.2.5
38、, 10.4, Table 2, and Table 3.TABLE 1 First Article SpecimensInspection Quantity RequirementsSubsection TestSubsectionCore material: 4.2 10.1Density 5 for every grade or type 4.2 10.1.1Compressive strength 5 for every grade or type 4.2 10.1.2Shear strength 5 for every grade or type 4.2 10.1.3Flammabi
39、lity 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 10.3.1SM-C-947237: 3 eachSM-C-947230: 3 eachImpact panel 1 from wall, 1 from floor 5.4.1 10.7Hold down a
40、ssembly 1 complete 9.2 10.32Eye casting hardness 1 casting in accordancewith SM-D-9471437.5.2 10.24.2E1975 1535.2.1 Welding and BondingAll aluminum parts to be welded or bonded shall be cleaned in accordance with Practice E864 andDrawing SM-B-947180. The inspection and records maintenance requiremen
41、ts of Practice E864 and SM-B-947180 shall be met.Arc welded assemblies shall be cleaned to remove any scale, oxidation products, and excess flux. Any acid used in cleaning shallbe completely neutralized and removed.5.2.2 OtherAll aluminum parts to be sealed at a sub-assembly or at final assembly sha
42、ll be cleaned in accordance with PracticeE864 and SM-B-947180. Part drawings which cite a specific finish in accordance with MIL-F-14072 shall be cleaned as requiredtherein. After assembly the shelter shall be free from particles or scale, flux, excess adhesive, excess sealer, and other foreignmater
43、ial. The shelter shall be cleaned prior to application of finish.TABLE 2 In-Process InspectionInspection RequirementsSubsection SamplingSubsection TestSubsectionCore 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 .
44、 . . 10.2Low temperature 4.3 12.2.2 10.2Room temperature 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
45、10.5Lamination 5.4 12.2.7 10.6Interchangeability 5.6 12.2.8 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 InspectionInspection RequirementsSubsection TestSubsectionCleaning 5.2 10.4Welding 5.3
46、10.5Lamination 5.4 10.6Interchangeability 5.6 10.8Riveting 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 resistanceA 6.2 10.17Temperature 6.3 10.18Thermal diffe
47、rential 6.4 10.19Rail transport 7.2.1 10.21Drops 7.3 10.22Construction tightnessB,C 8.2 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
48、8.5 10.29Watertightness 8.6 10.30Fording 8.7 10.31Door latch torque (second time) 8.3 10.16A First article specimen testing shall be completed no later than the end of this test(see 11.1.1).B For correlation data purposes only. CTT test results are not to be used asaccept/reject criteria for the dro
49、p test.C Door portion and gasket portion only.E1975 1545.3 WeldingAll welds shall have thorough penetration and good fusion and shall be free from splatter, scabs, blisters,abnormal pock marks, cracks, voids, slag inclusions, and other defects. Welders shall be certified in accordance with SAEAMS-STD-1595. Inert gas shielded arc welding shall be used for welding of aluminum in accordance with the drawings, exceptwhere resistance welding is specified (see 12.2.6, 10.5, Table 2, and Table 3).5.3.1 Arc WeldingExcept where req
