1、Designation: E1975 15E1975 18Standard 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 standard. The values given in parentheses are mathematicalconversions
4、 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 all of the safety concerns, if any, associated with its use. It is the
5、 responsibility of the user of thethis standardto establish appropriate safety safety, health, and healthenvironmental practices and determine the applicability of regulatorylimitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principle
6、s on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C273/C273M Test Method for Shear Prope
7、rties of Sandwich Core MaterialsD1621 Test Method for Compressive Properties of Rigid Cellular PlasticsD1622/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
8、Surface Preparation of Aluminum 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
9、 Based SealantsE1794 Specification 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 W
10、all Relocatable StructuresE1925 Specification for Engineering and Design Criteria for Rigid Wall Relocatable Structures2.2 CommercialAWS Standards:3SAE AMS-W-6858AWS D17.1/D17.1M Welding, Resistance: Spot and SeamSpecification for Fusion Welding of AerospaceApplicationsSAE AMS-STD-1595AWS D17.2/D17.
11、2M Qualification of Aircraft, Missile, and Aerospace Fusion WeldersSpecification forResistance Welding for Aerospace Applications2.3 Federal Air Regulation (FAR):4FAR 25.853 Compartment Interior1 This specification is under the jurisdiction of ASTM Committee E06 on Performance of Buildings and is th
12、e direct responsibility of Subcommittee E06.53 on Materialsand Processes for Durable Rigidwall Relocatable Structures.Current edition approved May 1, 2015Sept. 1, 2018. Published August 2015September 2018. Originally approved in 1998. Last previous edition approved in 20092015as E1975 09.E197515. DO
13、I: 10.1520/E1975-15.10.1520/E1975-18.2 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 standardsstandards Document Summary page on the ASTM website.3 Available fro
14、m AMS Publications, SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http:/www.sae.org.American Welding Society(AWS), 8669 NW 36 St., #130, Miami, FL 33166-6672, http:/www.aws.org.4 Available from Flight Standards Service, Federal Aviation Administration (FAA), 800 Independe
15、nce Ave., SW, Washington, DC 20591, http:/www.faa.gov.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 previous version. Becauseit may not be technically possible to adequately depict all changes ac
16、curately, 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 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United S
17、tates12.4 Military Standards:MIL-F-14072 MIL-DTL-14072 Finishes for Ground Electronic Equipment5MIL-DTL-53039 Coating, Aliphatic Polyurethane, Single Component, Chemical Agent Resistant5MIL-DTL-55507 Shelter, Electrical Equipment, (With or Without Equipment), Packaging of5MIL-STD-202 Electronic and
18、Electrical Component Parts5MIL-STD-252 Wired Equipment, Classification of Visual and Mechanical Defects for Equipment, Electronic, Wired, and OtherDevices5MIL-STD-810MIL-STD-810G Environmental Engineering Considerations and Laboratory Tests5MIL-STD-1916 DOD Preferred Methods for Acceptance of Produc
19、t6MIL-STD-2219 Fusion Welding for Aerospace Applications6MIL-M-13231MIL-STD-13231 Marking of Electronic Items52.5 Drawings:6SC-D-36423 Hold Down AssemblySC-D-36424 Cable AssemblySC-C-200154 KeeperSM-D-450462 Panel Assembly, Emergency ExitSM-C-450466 Air FilterSM-C-555515 Shock MountSM-B-563756 Seale
20、rSC-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 Interference, MK-1079/GSM-D-781242 Door Fixture (S-280) Construction Tightness TestSM-D-781243 Drain
21、Fixture (S-280) Construction Tightness 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, FrontSM-D-947082 Panel Assembly, RearSM-D-947083 Panel Assembly, RoofSM-D-947084
22、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-947166 Door AssemblySM-B-947179 Bonding ProcedureSM-B-947180 Cleaning ProcedureSM-D-
23、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 Shelter, Electrical Equipment, S-280C/G (Shielded)3. Terminology3.1 Definitions:3.1.1
24、delaminationsfor the purpose of this specification, a delamination is defined as the condition that exists within a sheltersection or panel when two surfaces that once were bonded together are no longer bonded together. Delaminations may occur5 Available from DLA Document Services, Building 4/D, 700
25、 Robbins Ave., Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil.6 Available from USU.S. Army Natick Soldier Systems Center, ATTN: AMSRD-NSC-CP-CS, Kansas Street, Research, Development, and Engineering Center, ATTN:RDNS-SEE-T, 15 General Greene Avenue, Natick, MA 01760-5018, http:/www.army.mil/
26、natick.https:/www.army.mil/info/organization/natick.E1975 182between 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 result of a poor quality bond or t
27、hey 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 examinationexamination consists of simple, ge
28、nerally nondestructive determinations of compliance, without the use ofspecial testing equipment.3.1.3 inspectioninspection 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
29、of determinations of compliance, using technical means.3.1.5 voidsfor the purpose of this specification, a void 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 requirement
30、s. Voids range fromgaps as wide as the space created by a missing piece of core material to as thin as a break in 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 ma
31、terial; or they may be located between other parts within a panel, such as where a piece of material is missing,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 delaminate
32、d skin (see 5.4).NOTE 1All other terminology related to this specification is defined in Terminologies 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, comp
33、ressive strength, shear strength, flammability, and water absorption propertiesshall be in accordance 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
34、 shall be in accordance with requirements ofSpecification E1794 and the Drawing SM-B-947184. This requirement 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
35、.2.3, 10.2, 10.2.2, Table 1, and Table 2).4.4 SealerThe shear strength of the cured sealer and its bond 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 5F5 F (54 6 3C)3 C) (see 12.2.2 and Table 2
36、),4.4.2 Room Temperature200 psi (1.4 MPa) when tested at 80 6 10F10 F (27 6 6C)6 C) (see 12.2.3 and Table 2),4.4.3 High Temperature75 psi (75 kPa) when tested at 200 + 0 5F5 F (93 +0 3C)3 C) (see 12.2.2 and Table 2),4.4.4 Sealer Shear, Humidity ExposureThe sealer and its bond to the aluminum shall w
37、ithstand exposure to 95 % relativehumidity 65 % at 160 6 5F (71 6 3C)5 F (71 6 3 C) for fourteen days. After exposure the sealer shall have a minimumaverage shear strength of 75 psi (520 kPa) when tested at 160 6 5F (71 6 3C).5 F (71 6 3 C).4.4.5 Sealer Shear, Salt Spray ExposureThe sealer and its b
38、ond to the aluminum shall withstand exposure to the salt spraytest. Method 509.4509.6 of MIL-STD-810FMIL-STD-810G using a 20 % NaCl solution at 95 6 5F5 F (35 6 3C)3 C) forfourteen days. After exposure the sealer shall have a minimum average shear strength of 200 psi (1.4 MPa) when tested at 180 610
39、F (27 6 6C).10 F (27 6 6 C).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 10.1.3Flammabil
40、ity 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 as
41、sembly 1 complete 9.2 10.32Eye casting hardness 1 casting in accordancewith SM-D-9471437.5.2 10.24.2E1975 1834.5 Shock MountsShelter skid shock mounts shall be in accordance 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, and Table 3).5. Construction
42、 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, 10.4, Table 2, and Table 3.TABLE 2 In-Process InspectionInspection Requi
43、rementsSubsection 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 . . . 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
44、: 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 12.2.8 10.8Riveting 5.7 12.2.9 10.9Eye casting hardness 7
45、.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 10.5Lamination 5.4 10.6Interchangeability 5.6 10.8Riveting 5.7 10.9Construction tightness 8.2 10.10Finish 5.8
46、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 differential 6.4 10.19Rail transport 7.2.1 10.21Drops 7.3 10.22Construction tightnessB,C 8.2 10.10.1Construction ti
47、ghtnessB, 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 8.5 10.29Watertightness 8.6 10.30Fording 8.7 10.31Door latch torque (sec
48、ond 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 drop test.C Door portion and gasket portion only.E1975 1845.2.1 Welding and
49、 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 requirements 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 shall be cleaned in accordance with PracticeE86
