1、Designation: E 1974 06Standard Specification forShelter, Electrical Equipment S-250/G1This standard is issued under the fixed designation E 1974; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i
2、n 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 mo
3、bile shelter designed for transport by cargo truck, fixedor rotary winged aircraft, by rail, and ship, designated asShelter, Electric Equipment S-250/G.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 portion of 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 t
5、he 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 CellularPlasticsD
6、2842 Test Method for WaterAbsorption of Rigid CellularPlasticsE 1370 Guide for Air Sampling Strategies for Worker andWorkplace ProtectionE 1749 Terminology Relating to Rigid Wall RelocatableSheltersE 1773 Practice for Sealing Rigid Wall Tactical Shelterswith Polysulfide Based SealantsE 1800 Specific
7、ation forAdhesive for Bonding Foam CoredSandwich Panels (160F Elevated Humidity Service), TypeI PanelsE 1801 Practice for Adhesive Bonding of Aluminum Fac-ings in Foam and Beam Type SheltersE 1851 Test Method for Electromagnetic Shielding Effec-tiveness of Durable Rigid Wall Relocatable StructuresE
8、1925 Specification for Engineering and Design Criteriafor Rigid Wall Relocatable Structures2.2 Commercial Standards:3SAE AMS-W-6858 Welding, Resistance: Spot and Seam2.3 Federal Air Regulation (FAR):FAR 25.853 Compartment Interior42.4 Military Standards:MIL-F-14072 Finishes for Ground Based Electron
9、ic Equip-ment5MIL-DTL-55507 Shelter, Electrical Equipment (With orWithout Equipment), Packaging of5MIL-STD-252 Wired Equipment, Classification of Visualand Mechanical Defects5MIL-STD-810 Environmental Engineering Considerationsand Laboratory Tests5MIL-STD-2219 Fusion Welding for Aerospace Applica-ti
10、ons5MIL-STD-13231 Marking of Electronic Items2.5 Drawings:DL-SM-B-563500 Shelter, Electrical Equipment, S-250/G6DL-SM-B-649950 Modification Kit, EMI, MK-1092/G6DL-SM-B-650123 Shelter, Electrical Equipment, S-250/G(Shielded)6SM-D-208679 Outer Door Assembly6SM-D-208682 Inner Door Assembly61This specif
11、ication is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility 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
12、. Last previous edition approved in 2001 as E 1974 01a.2For referenced ASTM standards, visit the ASTM website, 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.3Avail
13、able from AMS Publications, Society of Automotive Engineers (SAE),400 Commonwealth Dr., Warrendale, 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 Stan
14、dardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, 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
15、 C700, West Conshohocken, PA 19428-2959, United States.SM-C-435904 Keeper6SM-C-435937 Nameplate6SM-B-563559 Adhesive6SM-B-563655 Foam, Rigid, Plastic6SM-D-563754 Diagram, Flatness and Squareness6SM-C-564839 Gasket, Silicone6SC-C-595537 Padlock and Key6SC-B-595538 Bonding Procedure6SC-B-595539 Cleani
16、ng Procedure6SC-B-595564 Core Material Urethane, Light6SC-B-595565 Core Material Urethane, Heavy6SM-D-649951 Modification Kit EMI MK-1092/G6SM-D-649952 Sling Assembly6SM-D-649953 Shelter, Electrical Equipment S-250/G6SM-C-650082 Skid Assembly6SM-D-650085 Test Weight Installation6SM-C-650125 Nameplat
17、e6SC-D-781228 Door Fixture Construction Tightness Test6SC-D-781235 Drain, Fixture, Construction Tightness Test6SC-D-781236 Test Fixture Installation Construction Tight-ness Test6SC-B-964240 Nameplate, S-250 Shelter (With Rivnuts)63. Terminology3.1 Definitions:3.1.1 delaminationsfor purpose of this s
18、pecification, 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. Delaminationsmay occur between any two bonded surfaces; examples in-clude: separations between thermal barriers and memb
19、ers,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 severehandling of the panels or the shelter after bonding. Testrequirements of this specification shall not be construed asmis
20、use or severe handling as these terms apply to the definitionof delaminations.3.1.2 examinationexamination consists of simple, gener-ally nondestructive determinations of compliance, without theuse of special testing equipment.3.1.3 inspectioninspection is the examination or testing,or both, of supp
21、lies to determine compliance with the appli-cable requirements. Sampling an element of inspection.3.1.4 testingtesting consists of determinations of compli-ance using technical means.3.1.5 voidsfor the purpose of this specification, a void isdefined as any unauthorized separation or space within ash
22、elter 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 space created by amissing piece of core material to as thin as a break in thecontinuity of material. Voids may be located solely within
23、 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 parts within apanel, such as where a piece of material is missing, damaged,or undersized. Voids may have been created at the time of
24、construction such as where a part was omitted; or may becreated at a later time, such as a core separation or delaminatedskin.NOTE 1All other terminology related to this specification is defined inTerminology E 1749.4. Materials Requirements4.1 GeneralThe materials and components shall be asspecifie
25、d herein and on the applicable drawings. Materials andcomponents not definitely specified shall be of the qualitynormally used by the manufacturer provided the completeditem complies with all the provisions of this specification.4.2 AdhesiveThe adhesive used to laminate in accordance5.2 shall meet t
26、he requirements of Specification E 1800 and thephysical properties required by Drawing SM-B-563559 whentested in accordance with 10.1.4.3 SealerThe sealer, when tested in accordance with10.1, used to meet the requirements of 5.3, shall have thefollowing properties:4.3.1 Sealer Shear, AmbientThe seal
27、er and its bond to thealuminum shall have a minimum average shear strength of 200psi (1.4 MPa) when tested at 80 6 10F (27 6 6C).4.3.2 Sealer Shear, Temperature ExtremeThe sealer andits bond to the aluminum shall have a minimum average shearstrength of:4.3.2.1 200 psi (1.4 MPa) when tested at 65 6 5
28、F (5463C), and4.3.2.2 75 psi (520 KPa) when tested at 200+05F(93+ 0 3C)4.3.3 Sealer Shear, Humidity ExposureThe sealer and itsbond to the aluminum shall withstand exposure to 95 %relative humidity 6 5 % at 160 6 5F (71 6 3C) for fourteendays. After exposure the sealer shall have a minimum averageshe
29、ar strength of 75 psi (520 kPa) when tested at 160 6 5F (716 3C).4.3.4 Sealer Shear, Salt Spray ExposureThe sealer and itsbond to the aluminum shall withstand exposure to the salt spraytest, Method 509.4 of MIL-STD-810F using a 20 % NaClsolution at 95 6 5F (35 63C) for fourteen days. Afterexposure t
30、he sealer shall have a minimum average shearstrength of 200 psi (1.4 MPa) when tested at 80 6 10F (27 66C).4.4 Core MaterialThe core material shall be a slab typefoamed plastic. All three densities shall be used in the shelter.Disbursement within the shelter shall be in accordance withSpecification
31、E 1730 and the drawings listed on DL-SM-B-563500. Density, compressive strength, flammability, waterabsorption, and shear strength properties shall be in accordancewith Drawings SC-B-595564, SC-B-595565, and SM-B-563655, as applicable when tested in accordance with 10.2.5. Construction Requirements5
32、.1 GeneralAll parts, sub-assemblies, and the final as-sembly of Shelter, Electrical Equipment, S-250/G shall beconstructed as specified herein and in accordance with thedrawings listed on DL-SM-B-563500 or DL-SM-B-650123when electromagnetic interference suppression is required (see15.2). Shelters sh
33、all not be fork lifted at anytime during or afterconstruction.E19740625.2 LaminationDuring the laminating (bonding) processthe mating of all panel constituents shall be bonded withoutdelaminations, that is, discontinuation in, or separation be-tween the constituents. Bonding shall be in accordance w
34、ithPractice E 1801 and SC-B-595538. Both sides of all panelsprior to assembly into shelter form and all shelters shall beacoustically interrogated for delaminations using a tap hammerfabricated in accordance with Fig. 1. The shelter may beconsidered acceptable if it contains less than twelve distinc
35、tlyindividual delaminations or unbond type voids, provided noneis greater than 2 in. (50 mm) across measured in any direction,and provided the shelter meets all other requirements.5.3 SealAll inner and outer skins, joints, edges, andhardware shall be sealed in a manner that will preventcollection an
36、d retention of water and provide a barrier againstthe entrance of water into any panel or the interior of theshelter. Unless otherwise specified on the shelter drawings, allexterior rivets, rivnuts, screws, and bolts shall be dipped insealer prior to installation and the heads of rivets shall becove
37、red with sealant after installation. (See Practice E 1773).5.4 CleaningAll metal parts shall be cleaned at that stageof assembly indicated on the applicable drawing listed onDL-SM-B-563500 or DL-SM-B-650123, by a process in ac-cordance with Practice E 1773 and Drawing SC-B-595539 oras specified in t
38、he applicable portion of MIL-F-14072. Allfoam and wood parts shall be cleaned in accordance with theapplicable portions of Practice E 1801 and Drawing SC-B-595538.5.5 WeldingArc and spot welding shall be applied asspecified by the drawings. No grinding of welds shall berequired except as specified b
39、y the drawings. The purchaserreserves the right to perform any of the inspections where suchinspections are deemed necessary to ensure supplies andservices conform to prescribed requirements.5.5.1 Arc WeldingInert gas shielded arc welding shall bein accordance with MIL-STD-2219.5.5.2 Spot WeldingSpo
40、t welding shall be in accordancewith SAE AMS-W-6858 Class B. Samples of the productionitems produced in accordance with the drawings shall beinspected by the supplier for appearance, external defects,sheet separation, surface identification, and weld location.5.5.2.1 Test specimens shall be used to
41、represent the manu-facturing practice. Three single-spot shear specimens shall beused for checking purposes. Three single shear specimens shallbe tested for ultimate strength and variation in shear strength.5.5.2.2 Failure of a test specimen or samples of a weldeditem shall be cause for rejection of
42、 the production quantity thespecimen or sample represents.5.6 RivetingNo more than one rivet/rivnut in ten and nomore than two adjacent rivets/rivnuts shall exhibit any of thedefects specified below, when inspected as specified in 10.6.5.6.1 LoosenessThere shall be no evidence of loosenessparallel t
43、o the plane of the mating surface due to oversizedholes or looseness perpendicular to the plane of the matingsurfaces due to rivets/rivnuts not being tightly seated.5.6.2 HeadsRivet and rivnut heads shall not be cut,marred, chipped, eccentric, distorted, or otherwise mutilated.Countersunk rivets and
44、 rivnuts shall not project above or belowthe mating surface more than 15 % of the netting materialthickness.5.6.3 Mating Surface and MaterialsThe mating surfaceshall not be marred or indented due to rivet or rivnut installa-tion, nor shall there be any distortion or warpage of the matingmaterials. T
45、here shall be no foreign material between rivetedsurfaces.5.7 HardwareAll locks, latches, hinges, hinge pins, fas-teners, bolts lifting and towing eyes, steps and other shelterhardware shall be made corrosion resistant in accordance withthe applicable drawings listed on DL-SM-B-563500 or DL-SM-B-650
46、123. The hardware shall be subjected to the test of10.7 and shall show no evidence of corrosion or damage whichin any way impairs the specified performance of the individualpart.5.7.1 Padlocks and KeysAll padlocks and keys shall be inaccordance with SC-C-595537 and shall be interchangeable tothe ext
47、ent determined by 10.10.5.8 Finish ProtectiveProtective finishes shall be in accor-dance with the applicable drawings listed on DL-SM-B-563500 or DL-SM-B-650123 and shall be free of the defectscited in the classification of visual finish defects of MIL-F-14072 when inspected as specified in 10.8 and
48、 10.12.5.9 MarkingMember centerline, punch marks, name-plates, instruction and data plates, and other markings shall bein accordance with MIL-STD-13231 and the applicable draw-ings listed on DL-SM-B-563500 or DL-SM-B-650123. Mark-ing shall be inspected as specified in 10.9 and 10.12.5.10 Interchange
49、abilityLike units, subassemblies, assem-blies and replaceable parts shall be physically and functionallyinterchangeable without modification of such items or of theshelter. Dimensions shall be within the limits specified on theapplicable drawings listed on DL-SM-B-563500 or DL-SM-B-650123. Reliance shall not be placed on any unspecifieddimension, rating, characteristic, etc. Individual items shall notbe hand picked for fit or performance. To determine compli-ance with this requirement the items listed in 10.10 shall bemeasured and s
