1、 MIL-PRF-14442E W 9999906 2057327 2TT I INCH-POUND1 MIL-PRF-l4442E(AT) 21 November 1997 SUPERSEDING 28 June 1990 MIL-T-l4442D(AT) PERFORMANCE SPECIFICATION TANK, EUEL, ENGINE: NON-METALLIC, NON-SELF-SEALING, FOR MILITARY VEHICLES This spdcation is approved for use within the U.S. Army Tank-automotiv
2、e and Armaments Command, Department of the Amy, and is available for use by aii Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of non-metallic, non-self-sealing fuel tanks (fuel cell type) for use in miiitary tacticai vehicles and combat
3、 vehicles. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specication. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effo
4、rt has been made to ensure the completeness of this list, document users are cautioned that they must meet aii specified requirement documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Non-Government publications. The following documents form a part of this
5、 document to the extent specified herein. Unless otherwise specied, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents ci
6、ted in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Tank-automotive and Armaments Command, AT“: AMSTA-TR-EBLUE, Warren, MI 48397-5000, by using the Stand
7、ardization Document Improvement Proposai D Form 1426) appearing at the end of this document, or by letter. AMSC N/A FSC 2910 DISTRIBUTION STATEMENT A Approved for public release; distribution is unlimited. Licensed by Information Handling Services- MIL-PRF-14442E 9999906 2057128 136 MIL-PRF- 14442E(
8、AT) AMEiRICAN SOCIETY FOR TESTING AND MATERZALS (ASTMJ ASTM D381 ASTM D412 ASTM D413 ASTM D471 ASTM D5486 - Existent Gum in Fuels by Jet Evaporation, Test Method for OD Adopted). - Rubber Properties in Tension, Test Methods for OD Adopted). - Rubber Property-Adhesion to Flexible Substrate, Test Meth
9、ods for OD Adopted). - Standard Test Method for Rubber Property - Effect of Liquids OD Adopted). - Standard Specifkition for Pressure-Sensitive Tape for Packaging, Box Closure, and Sealing OD Adopted). (Copies of ASTM publications may be obtained from the American Society for Testing and Materials,
10、100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations u
11、nless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.3. 3.2 Design. materials. and manufacturing mocess. Unless otherwise specified (see 6.2), the design, materials, and
12、 manufacturing process selection is the prerogative of the contractor as long as all articles submitte to the government fully meet the interface and interoperability, environmental, support and ownership, and operating requirements specified herein. 3 2.1 Recycled. recovered. or environmentally pre
13、ferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economicay advantageous life cycle costs. 4 3.3 Inte#ace and interoDera
14、ility. The fuel tank shall be of flenile construction, and sha consist generally of a nonmealic carcass of unit construction, with openings or fittings satisfctory for the necessary attachment of parts and accessories in accordance with applicable drawings. Fuel tanks shall conform to the envelope d
15、imensions, contours, fitting and mounting interfaces as shown on applicable drawings (see 6.2). 2 Licensed by Information Handling Services flIL-PRF-L4442E 999990b 2057329 O72 MIL-PRF- 14442E(AT) 3.3.1 Installation. The location of all fittings and the tank dimensions needed for installation shd be
16、within the dowable tolerances specified on the applicable drawings. 3.3.2 Stand. The fiel tank shail show no evidence of leakage as a result of standing. 3.3.3 Fuel contamination. The nonvolatile matenal, for a sample of the inner layers of fiel tank, shall not exceed 60 milligrams (mg) per 100 mill
17、iliters (mi) of the contaminated fluid. The stoved gum residue shail not exceed 20 mg per 100 ml of the contaminated fluid. 3.4 Environmental. 3.4.1 Humiditv (hvdrolvtic stabiiity! at elevated temperature. The specimen shail show no corrosion, peeling, cracking, warping, blistering, delamination, or
18、 discoloration as a result of exposure to high humidity at elevated temperatures. 3.4.2 Humidity hvdrolvtic stabiity) at room temperature. The specimen shall show no visible cracks, blisters or eruptions &er exposure to high humidity at room temperature. 3.4.3 Low temperature leakage. The fbel tank
19、shail show no evidence of leakage as a result of exposure to low temperatures. 3.5 Support and ownership. 3.5.1 Hazardous materials. The fuel tank shall not produce any hazards to personnel or the environment resuiting from the use of asbestos or cadmium. 3.5.2 Protective treatments. 3.5.2.1 Fitting
20、s. Fittings shaii be corrosion resistant or appropriately treated for corrosion resistance. 3.5.2.2 Openings. Ali openings to tanks shall be fitted with fully cured Buna-N or equaily fuel resistant material which shall be resistant to cutting, and to gouging as a result of sealing pressure generated
21、 by torquing hold-down bolts. 3.5.3 Access opening. Each fuel tank shall be provided with a hand hole and cover to permit arm access to the tank interior for inspection and repair. 3.5.4 Handling. The fuel tank shall show no evidence of cracks, loosening of fittings, or fidure of seams when it is fo
22、lded and unfolded 40 times in accordance with standard procedure for shipment. 3 Licensed by Information Handling Services3.5.5 Fluid resistance of exterior surfaces. The exterior surfaces of the fuel tanks shall show no sweiiing, separation, blistering, or dissolution when exposed to fuel. 3.5.6 Pe
23、rmeability. Fuel tank permeability shall be less than 0.025 fluid ounces (fl-oz) per square foot (fi2) per 24 hours for each specimen tested. 3.5.7 Tensile strenrrth. The inner layer ply of the tank, without barrier, shall have a tensile strength not less than 80 percent (%) of the value calculated,
24、 based on the original cross sectional area of the ply. 3.5.8 Seam adhesion. The seam adhesion of the inner ply of the fuel tank shall be not less than 12 pounds (lb). There shail be no failure of the seam. 3.5.8.1 Wet seam adhesion. The wet seam adhesion shall be not less than 50% of the dry adhesi
25、on value. 3.5.9 Puncture resistance. The force required to puncture the fuel tank wall shaii be not less than 15 Ib. 3.5.10 Identication marking. Each fuel tank shall have the following information permanently and legibly marked on the face or surface in which the opening for the fuel-level gage sen
26、ding unit is located: Army part number. Vehicle nomenclature. Name of man&acturer. Date of manufacture (year and quarter). Mandacturers serial number. Manufhturers construction number. Specification MLPRF-14442. Date of acceptance. Contract or order number. 3.5.10.1 Filler cap. The external surface
27、of the filler cap shall be formed and painted with diesel &el (DF-A, DF-1, DF-2, and JP-8) resistant lacquer, and legibly marked in white lettering: “Fuel (*) US Gai.” (* to be Xed in with usable capacity taken as the average capacity of the irst 10 production tanks). 3.5.10.2 Hand-hole cover. The e
28、xterior suface of the hand-hole cover of each fuel tank shaU be legibly and permanently marked OUTSIDE”. 4 Licensed by Information Handling Services MIL-PRF-L4442E m 9999906 2053131 320 m MIL-PRF- 14442E(AT) 3.5.10.3 Toraue values. The torque values required for assembly shall be marked on, or adjac
29、ent to, each fitting or accessory involved, on the side torque wrench is applied. If the torque required is the same for each such item, that value may be,stenciled in only one place on the surface of tank in a conspicuous location. 3.6 Operating. When installed in the vehicle structure for which it
30、 is designed, the fuel tank shall be capable of withstanding the loads incident to road shock and vibrations common to off-the-road and high speed highway operation of the vehicle. 3.6.1 Capacity. The nominal capacity of the fbel tanks shall be as specified with a tolerance of 3.0% (see 6.2). 3.6.2
31、Leakwe. The fuel tank shail show no evidence of leakage. 3.6.3 Slosh. The &el tank shall show no evidence of leakage or other failure such as chafing, disengaged hangers, or liner breaks as a result of content sloshing. 4. VERIFICATION 4.1 Classification of insDection. The inspection requirements sp
32、ecified herein are classified as follows: a. First article inspection (see 4.3). b. Conformance inspections (CI) (see 4.4). 4.2 Inspection conditions. Unless otherwise specified (see 6.2), ali inspections shall be conducted under the following conditions: a. Air temperature: 73 & 3 degrees Fahrenhei
33、t (OF) b. Barometric pressure: 28.5 (+2, -3) inches (i.) mercury c. Relative humidity: 50 5% 4.2.1 Test structure. When specied (see 6.2), the test structure shail be a simulation of the actual vehicle structure. It shali duplicate the shape, dimensions and material of the tank supporting stnicture
34、in the vehicle. The necessary stops, cushions, and pads, identical with those used in the finished vehicle, for mounting and supporting the tank, shall be provided. It shail be constructed so that the test tank can be installed in and removed fiom the structure in an identical manner to that used in
35、 the actual vehicle installation. 4.2.2 Support iig. The jig shail support the tank test structure specified in 4.2.1 , to simulate the actual vehicle installation. The support jig shall be a strongly constructed fiamework of metal, for carrying the mounted test tank and designed for bolting to the
36、rocker assembly 5 Licensed by Information Handling Services MIL-PRF-14442E 9999906 2057332 667 Wet seam adhesion Puncture resistance MlL-PRF- 14442E(AT) specied in 4.9.2. The jig shall be designed so that removal of the tank test structure may be accomplished with a minixnum effort. 4.3 First articl
37、e inspection. When a first article sample is required (see 3. i), samples shall be inspected as specified in table I. First article sampIes shai be selected as follows: 3.5.8.1 3.5.9 Three full size tanks complete with necessary fittings. Three 12 by 12 in. specimens of composite tank construction.
38、One specimen of inner layer ply, without barrier, approximately 900 square inches (in2) One specimen of 6 by 6 in. inner layer ply, without barrier. Three permeability specimens in accordance with 4.8.3.2. in area, including seam. Title Interface and interoperabiity Installation Stand Fuel contamina
39、tion Environmental Humidity at elevated temperature Humidity at room temperature Lowtemperature leakage Support and ownership Hazardousmaterials Protective treatments Fittings openings Accessopening Handling TAEG Requirement 3.3 3.3.1 3.3.2 3.3.3 3.4 3.4.1 3.4.2 3.4.3 3.5 3.5.1 3.5.2 3.5.2.1 3.5.2.2
40、 3.5.3 3.5.4 I. Classifcat Verication 4.6 4.6.1 4.6.2 4.6.3 4.7 4.7.1 4.7.2 4.7.3 4.8 4.8 4.8 4.8 4.8 4.8 4.8.1 zofillmxti OIE. Title I Requirement Huid resistance of exterior surfaces Permeability Tensile strength Seam adhesion 3.5.5 3.5.6 3.5.7 3.5.8 Identificaton FiUer cap Hand-hole cover Torque
41、values marking Operating capacity Leakage Slosh 3.5.10 3.5.10.1 3.5.10.2 3.5.10.3 3.6 3.6.1 3.6.2 3.6.3 I Verifcation 4.8.2 4.8.3 4.8.4 4.8.5, 4.8.5.1 4.8.5.2 4.8.6 4.8 4.8 4.8 4.8 4.9 4.9 4.9.1 4.9.2 4.4 Conformance insuection. Conformance inspection shal include the applicable tests of table I as
42、specified in the contract (see 6.2). 4.5 Verication methods. The types of verifkation methods included in this section are examination of contractor records, visuai inspection, measurement, sample tests, frill-scale demonstration tests, simulation, modeling, engineering evaluation, component propert
43、ies analysis, and similarity to previously-approved or previously-qualified designs. 6 Licensed by Information Handling Services - MIL-PRF-34442E 9999906 2057333 5T3 MIL-PE- 14442E(AT) 4.5.1 Verification alternatives. The manufacturer may propose alternative test methods, techniques, or equipment, i
44、ncluding the application of statistical process control, tool control, or cost-effective sampling procedures, to vem performance, 4.6 Interface and interoperability. Conformance to 3.3 through 3.3.3 shall be determined using appropriate verification methods specified in 4.5 or 4.5.1 and the tests sp
45、ecified in 4.6.1 through 4.6.3.2. 4.6.1 Installation. 4.6.1.1 First article sample. For first article testing, conformance to 3.3.1 shall be determined using the test structure specified in 4.2.1. 4.6.1.2 Quality conformance. For conformance testing, conformance to 3.3.1 shall be determined, using a
46、 test jig (see 4.2.2) or registered metal templates fabricated in accordance with design requirements fiunished by the vehicle manufacturer for the particular vehicle. 4.6.2 Stand. To detede conformance to 3.3.2, the tank shall be tested as specified in 4.6.2.1 or4.6.2.2, asapplicable. 4.6.2.1 First
47、 article. Upon completion of the low temperature test specified in 4.7.3, the cavity shall be completely lined with brown paper. The tank shall be refilled with fluid conforming to reference fiel B of ASTM D471. The tank shall be dowed to stand at the standard ambient temperature for a period of 30
48、days, at which time the paper shall be examined for any stains indicating a fluid leakage. 4.6.2.2 Conformance testing. Each tank selected for conformance inspection shall be collapsed and held for 30 minutes in a position comparable to that encountered prior to installation in its respective vehicl
49、e cavity. Prior to the installation of the tank, the test structure shali be completely lined with brown paper and held in place with tape conforming to ASTM D5486. Then the tank shall be installed in its test structure. The tank shali then be fiiled with fluid conforming reference fel B of ASTM D471 and shall be stand tested for 30 days. The tank may be inspected at 10-day intervals during the test. At the conclusion of the 30-day test, the tank shall be drained and removed fiom the test cavity. The test cavity shall be inspected
