1、MIL-A-25896E18 January 1983SupersedingMIL-A-25896D28 June 1976MILITARY SPECIFICATIONADAPTER, PRESSURE FUEL SERVICING,NOMINAL 2.5-INCH DIAMETERThis specification is approved for use by allDepartments and Agencies of the Department of Defense.1. SCOPE1.1 Scope This specification covers pressure fuel s
2、ervicing adapters having anominal line size of 2.5-inch diameter.2. APPLICABLE DOCUMENTS2.1 Government documents2.1.1 Specifications. standards, and handbooks. Unless otherwise specified,the following specifications, standards, and handbooks of the issue listed inthat issue of the Department of Defe
3、nse Index of Specifications and Standards(DODISS) specified in the solicitation form a part of this specification to theextent specified herein.SPECIFICATIONSFederalP-D-680 Dry Cleaning SolventQQ-P-416 Plating, Cadmium (Electrodeposited)TT-S-735 Standard Test Fluids; HydrocarbonPPP-B-601 Boxes, Wood
4、, Cleated-PlywoodPPP-B-636 Boxes, Shipping, FiberboardMilitaryMIL-P-116 Preservation, Methods OfMIL-G-5572 Gasoline, Aviation: Grades 80/87, 100/130, 115/145MIL-T-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5MIL-C-6021 Castings, Classification and Inspection ofMIL-I-8500 Interchangeability and R
5、eplaceability of component parts forAerospace VehiclesProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-25896EMIL-N-25027MIL-R-25988MIL-T-83133MIL-R-83248STANDARDSFederalFED-STD-151MilitaryMIL-STD-129MIL-STD-130MIL-STD-143MIL-STD-831MIL-STD-889MI
6、L-STD-1188MIL-STD-1523MS20995MS24484MS24694MS29520MS33540MS33588Nut, Self-locking, 250F, 450F and 800F, 125 KSI Ftu, 60 KSIFtu and 30 KSI FtuRubber, Fluorosilicone Elastomer, Oil- and Fuel-resistant,Sheets, Strips, Molded Parts, and Extruded ShapesTurbine Fuel, Aviation, Kerosene Type, Grade JP-8Rub
7、ber, Fluorocarbon Elastomer, High Temperature, Fluid andCompression Set ResistantMetals, Test MethodsMarking for Shipment and StorageIdentification Marking of U.S. Military PropertyStandards and Specifications, Order of Precedence for theSelection ofTest Reports, Preparation ofDissimilar MetalsComme
8、rcial Packaging of Supplies and EquipmentAge Controls of Age-sensitive Elastomeric MaterielWire, Safety or LockAdapter, Pressure Fuel Servicing, Nominal 2.5 Inch DiameterScrew, Machine, Flat Countersunk Head, 1000 Structural, CrossRecessed, UNC-3A and UNF-3AEnvelope Dimensions, Nozzle, Pressure fuel
9、 Servicing, Locking,Aircraft, Type D-1Safety Wiring and Cotter Pinning, General Practices forNut, Self-locking, Aircraft, Design and Usage; Limitations of (Copies of specifications, standards, drawings, and publications required bycontractors in connection with specific procurement functions should
10、beobtained from the procuring activity or as directed by the contractingofficer.)2.2 Order of precedence. In the event of a conflict between the text of thisspecification and the references cited herein, the text of this specificationshall take precedence.3. REQUIREMENTS3.1 Qualification. The adapte
11、rs furnished under this specification shall beproducts which are qualified for listing on the applicable qualified productslist at the time set for opening of bids (see 4.4 and 6.3).2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-25896E3.2 Sel
12、ection of specifications and standards. Specifications and standardsfor necessary commodities and services not specified herein shall be selectedin accordance with MIL-STD-143, except as specified in 3.2.1 and 3.2.2.3.2.1 Commercial parts. Commercial parts having suitable properties may beused where
13、, on the date of invitation for bids or request for proposal, thereare no suitable standard parts. In any case, commercial utility parts, likescrews, bolts, nuts, and cotter pins having suitable properties may be used,provided:a. They can be replaced by the standard parts (AN, MS, or NAS) withoutalt
14、eration.b. The corresponding standard part numbers are referenced in the parts listand, if practicable on the contractors drawings.3.2.2 Standard parts. With the exceptions specified in 3.2.1, MS, AN, and NASstandard parts shall be used where they are suitable for the intended purpose.3.3 Materials.
15、 All materials shall be resistant to all fluids in accordancewith TT-S-735, MIL-G-5572, MIL-T-5624, and MIL-T-83133 as proven by successfulcompletion of the tests of 4.4.2.3.3.1 Metals. The portion of the adapter that supports the loads of 4.6.7shall have 40 KSI minimum yield strength. Metals shall
16、be inspected inaccordance with FED-STD-151. Alloys of magnesium and copper shall not be usedon parts that come into contact with fuel. Cadmium plating shall conform toclass 2, type II of QQ-P-416.3.3.2 Castings. Castings shall be clean, sound, and free from blowholes,porosity, cracks, or any other d
17、efects which would prevent the successfulcompletion of the tests of 4.6. The castings that support the loads of 4.6.7shall conform to MIL-C-6021, class 3, grade C.3.3.3 Dissimilar metals. Dissimilar metals in accordance with MIL-STD-889shall not be used in intimate contact unless they are protected
18、againstelectrolytic corrosion.3.3.4 Elastomers. Elastomers shall be in accordance with MIL-R-83248 orMIL-R-25988.3.3.5 Electrical conductivity. The resistance between the locking lugreference plane and the mounting surface shall be 0.010 ohms, maximum.3.4 Desire3.4.1 Interface. The adapter shall con
19、form to MS24484. When a MS29520 nozzleis secured to the adapter and opened or closed,the adapter shall open orclose, respectively. With the adapter installed in a test housing inaccordance with figure 1, the flow area around the adapter poppet when in thefull open position shall be a minimum of 4.8
20、square inches.3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-25896EFIGURE 1 Test housing.4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-258963.4.2 Locking of parts. All parts of the as
21、sembly shall be securely attached.Spring tension to hold parts in the assembly is not acceptable. All threadedparts shall be locked by safety wiring in accordance with MS20995, self-lockingnuts in accordance with MIL-N-25027, cotter pins, or other approved methods.Safety wire shall be installed in a
22、ccordance with MS33540. Self-locking nutsshall be used in accordance with MS33588; however, where loosening ordisengaging of a nut might result in the nut or other parts entering the fuelsystem, self-locking nuts shall not be used.3.4.3 Lubrication. The adapter shall require no lubricant.3.5 Perform
23、ance. The adapter shall be suitable for a temperature environmentas specified.a. Fuel: -55C (-67F) to +93C(+200F)b. Ambient: -55C (-67F) to +177C (+350F)The adapters shall satisfy the performance requirements when tested asspecified in section 4 herein.3.6 Interchangeability. Interchangeability shal
24、l be in accordance withMIL-I-8500.3.7 Weight. The weight of the adapter shall not exceed 1.0 pounds.3.8 Identification of product. Adapters shall be marked in accordance withMIL-STD-130. The minimum identification data is as follows:Adapter, Pressure Fuel ServicingMS24484-5Manufacturers identificati
25、on and part numberAssembly date per MIL-STD-15233.9 Workmanship. Workmanship shall be in accordance with all applicablespecifications, drawings, and quality control plans.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibilitv for inspection. Unless otherwise specified in the contractor purchase order, th
26、e contractor is responsible for the performance of allinspection requirements as specified herein. Except as otherwise specified inthe contract or purchase order, the contractor may use his own or any otherfacilities suitable for the performance of the inspection requirementsspecified herein, unless
27、 disapproved by the Government. The Governmentreserves the right to perform any of the inspections set forth in thespecification where such inspections are deemed necessary to assure suppliesand services conform to prescribed requirements.5Provided by IHSNot for ResaleNo reproduction or networking p
28、ermitted without license from IHS-,-,-MIL-A-25896E4.2 Classifications of inspection. The examination and testing of adaptersshall be classified as follows:a. Qualification inspection (4.4)b. Quality conformance inspection (4.5)4.3 Test conditions. Unless otherwise specified, the test conditionsspeci
29、fied herein shall apply.4.3.1 Test fluid. Fluid in accordance with MIL-G-5572, Grades 100/130 or115/145; MIL-T-5624, Grades JP-4 or JP-5; MIL-T-83133, Grade JP-8; or TT-S-735,type I shall be used for testing. Fluid conforming to P-D-680, type II (or anyfluid acceptable to the acquisition activity) m
30、ay be used, except where aspecific fluid is specified.4.3.2 Ambient temperature and pressure. All tests shall be performed with theambient and test fluid at temperatures of 60F to 9OF and at local barometricpressure.4.3.3 Test nozzle. The test nozzle used shall be an MS29520-1 nozzle.4.3.4 Test conn
31、ections. Unless otherwise specified herein, tests shall beperformed without any part (such as a cap or nozzle) being connected to theadapter locking flange (adapter inlet).4.4 Qualification inspection4.4.1 Qualification test specimens. The qualification test specimens shallconsist of four adapters,
32、two of which shall be untested and the other twowhich shall be tested by the contractor. Two complete sets of detail andassembly drawings and a test report showing results of the manufacturers testsshall be submitted with the two untested specimens. Specimens shall beidentified with the manufacturer
33、s own part number and any information requiredby the letter of authorization.4.4.1.1 Manufacturers drawings. The manufacturers drawings submitted withthe qualification test specimens shall have a cutaway section showing all partsin their normal assembled positions and shall specify part numbers of a
34、ll partsand subassemblies. The following data shall be furnished on or together withthe assembly drawing.a. Mounting dimensionsb. Overall dimensionsc. Location, size, and types of plumbing connectionsd. Materials, construction, treatment, and finishe. Pressure and flowrate ratings6Provided by IHSNot
35、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-25896E4.4.1.2 Test report. The test report submitted with the untestedqualification test specimens shall conform to MIL-STD-831 and shall include thefollowing:a. Report of all tests, graphically presented when prac
36、ticable, together witha detailed statement indicating conformance or extent of conformance with allrequirements of this specification, referring specifically to paragraphnumbers. Wherever a requirement is considered to be not applicable, the reportshould so state.b. Summary of endurance testc. Diagr
37、ams of all test setupsd. Outline and description of tests and test conditionse. Copies of test log sheetsf. Photographsg. List and descriptions of testing equipment4.4.2 Qualification tests. The qualification tests as listed below shall beperformed in the order listed.SPECIMEN NO. 1Examination of pr
38、oductProof pressureActuating forceFunctional (qualification)Leakage (qualification)Fuel resistance and low temperatureStrengthDisassembly and inspectionSPECIMEN NO. 2Examination of productProof pressureFunctional (qualification)Leakage (qualification)EnduranceAccelerated corrosionVibrationBurst pres
39、sureContaminated-fuel enduranceDisassembly and inspection(4,6.1)(4.6.11)(4.6.2.1)(4.6.4)(4.6.5)(4.6.69(4.6.7)(4.6.14)(4.6.1)(4.6.11)(4.6.4)(4.6.5)(4.6.8)(4.6.9)(4.6.10)(4.6.12)(4.6.13)(4.6.14)7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-258
40、96E4.4.3 Certification of qualification. Each manufacturer listed on theQualified Products List for at least two years shall be requested to forward tothe responsible activity certification signed by a responsible official ofmanagement attesting that the listed product is still available from the li
41、stedplant, can be produced under the same conditions as originally qualified andmeets the requirements of the specification.4.5 Quality conformance inspection. Quality conformance tests shall consistof the following:a. Individual tests (4.5.1)b. Sampling tests (4.5.2)4.5.1 Individual tests. Each ada
42、pter shall be subjected to the following:a. Examination of product (4.6.1)b. Functional (quality conformance) (4.6.2)c. Actuating force (4.6.2.1)d. Leakage (quality conformance) (4.6.3)4.5.2 Sampling tests4.5.2.1 Samplings plans. One adapter shall be selected at random from each 100or fraction there
43、of produced and subjected to the burst pressure test (4.6.12)and to the strength test (4.6.7a).4.6 Testing methods4.6.1 Examination of product. The specimen shall be inspected to determinecompliance with the requirements specified herein with respect to size,material, workmanship, weight (qualificat
44、ion only), and the dimensionalrequirements of the applicable MS standards. Data shall be available todemonstrate compliance with 3.3.1. At least two tensile test samples arerequired for each heat or melt. The hardness of the parts may be used todemonstrate compliance within each heat or melt.4.6.2 F
45、unctional (quality conformance). The specimen shall be subjectedto the test specified in 4.6.4, except that when test fluid is passed throughthe specimen, the flow rate need not be of a specific value as long as thespecified pressures are used.4.6.2.1 Actuating force. A load shall be applied to the
46、surface of thespecimen poppet valve to obtain 1.438-inch poppet travel. The load requiredfor the poppet valve to obtain this travel shall be 50 pounds, maximum.4.6.3 Leakage (quality conformance). The specimen shall be subject to thetest in 4.6.5 except with liquid pressure of 90 and 240 pounds per
47、square inch(psi) and air pressure of 1, 10 and 25 psi with a minimum of 15 seconds waitingperiod at each test pressure.8Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-25896E4.6.4 Functional (qualification). With the adapter installed in a test
48、housing in accordance with figure 1, a test nozzle in accordance with 4.3.3shall be inserted and locked into the specimen and the specimen sealing valveactuated five times minimum. Test fuel shall be passed through the nozzle andspecimen (nozzle-to-adapter direction) at flow rates from 100 to 600 ga
49、llonsper minute (gpm) in 5 gpm increments and a minimum entrance static pressure of60 pounds per square inch gage (psig) under flow conditions. The specimensealing valve shall be actuated to open and shut a minimum of three times atflow increments of 100 gpm from l00 to 600 gpm. There shall be no evidence ofchatter or binding.4.6.5 Leakage (qualification)a. Fuel leakage. With the poppet seated and fuel pressu
