1、flIL-H-LI495D LI7 7999906 0270523 5 M . e - /d - /? MIL-H-4495D 10 May 1985 SUPERSEDING MIL-H-O04495C(AS) 4 November 1983 3 July 1978 MIL-H-44956(1) MILITARY SPECIFICATION HOSE ASSEMBLY, RUBBER, AERIAL REFUELING This specification is approved for use by all Departments and Agencies of the Department
2、 of Defense. 1. SCOPE 1.1 Scope. This specification contains the design and test requirements of flexible hose assemblies for use in aerial refueling systems. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified, the fol lowing
3、specifications, standards, and handbooks of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS Federal QQ-W-428 Wire, Steel, Carbon (
4、High Carbon, Round, for Mechanical Springs, General Purpose) TT-S-735 Standard Test Fluids, Hydrocarbon PP P- B-5 9 1 Boxes, Shipping, Fiberboard, Wood-Cleated Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be
5、addressed to the Naval Air Engineering Center, Systems Engineering and Standardization Department (Code 931, Lakehurst, NJ 08733, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. DISTRIBUTION STATEMENT A. APP
6、ROVED FOR PBLIC RELEASE; DISTRIBUTION UNLIMITED. r -e . FSC 4720 THIS DOCUMENT CONTAINS / however, continuity must also be demonstrated through the end fittings when attached. The wire braid or helical wire shall be used to 3.2.5.2 Adhesion. The original adhesion of the hose tube and outer cover sha
7、ll be at least 12 pounds per inch when tested in accordance with ASTM D380. After 72 hours immersion in test fluid TT-S-735 Type III at 75 +5“F, the adhesion of the tube to outer cover shall be not less than 5 pounds per inch, when tested within 5 minutes after removal from the test fluid. 3.2.5.3 C
8、rush resistance. The outside diameter of the hose shall not be compressed more than 10 Percent when subjected to a weight of 1500 pounds disbibuted evenly over a one foot longitudinal section: 3.2.5.4 Flexibility. The hose shall be capable of being wound on a drum diameter which is six times the nom
9、inal inside diameter of the hose or 12 inches, whichever is greater, without cross-sectional deformation at a load of 1200 pounds. 3.2.5.4.1 Low temperature flexibility. The hose shall be capable of being repeatedly wound about a drum of a diameter equal to that determined in the preceding paragraph
10、 after soaking at -65F for 24 hours. must start with the hose bent on the drum. The hose shall develop no cracks and shall meet the applicable pressure requirements. The cold soak 3.2.5.5 Diameter. The nominal inside diameter shall be as required to meet the requirements of the aerial refueling syst
11、em. diameter shall be 1-1/2 inches and shall increase in increments of 1/8 inch. The outside diameter shall be the minimum to meet requirements of this specification and the intended aerial refueling system. hose shall be established during qualification of the refueling system and shall be controll
12、ed for all future production. The minimum inside The diameters of the 3.2.5.6 Length. The length of the hose assembly shall be as required by the intended aerial refueling system and shall include end fittings. shall have no splices or joints over the continuous length. Tolerances shall be such that
13、 replacement of a hose in the aerial refueling system will not affect the operation of the system nor require readjustment of the system. The length shall be measured from the extreme ends of the fittings. The hose Provided by IHSNot for ResaleNo reproduction or networking permitted without license
14、from IHS-,-,-MIL-H-4495D 47 9779906 0270528 Y m MIL-H-4495D 3.2.5.7 Weight-The weight per foot of the hase shall be the minimum required to meet the requirements of this specification and the intended aerial refueling system, The actual weight of the hose shall be established during qualification of
15、 the refueling system and shall be tightly controlled for al 1 future productions. 3.2.5.8 End fittings, The hose end fittings shall be of the permanently The end fittings shall be installed in such a manner as to make swaged type. the hose assembly electrically continuous. The end fitting which is
16、to mate with the aerial refueling reception coupling shall be in accordance with MS24358. The end fitting connecting to the tanker hose stowage system shall be as specified by the acquiring activity, The end fittings shall be of corrosion-resistant steel. Cements, sealants, or adhesives shall not be
17、 used in the installation of end fittings. The end fittings shall have a smooth bore. The fitting shall be so constructed as to insure a tight grip on the hose. The outer body shall have a rounded outer edge to prevent cutting of the hose during installation or upon sharp bending. The inner sleeve s
18、hall also be free of sharp edges to prevent cutting of the hase during installation or upon sharp bending. 3.2.5.8.1 Bulge, The installation of the hose end fittings shall not cause the hose inner tube to bulge or reduce the inside diameter of the hose to less than the inside diameter of the end fit
19、ting. 3.2.5.8.2 Gages. Necessary gages to properly measure the critical dimensions of the end fittings to assure conformance to the specified contours shall be made available to the Government Inspector. gages shall be certified in a manner satisfactory to the Government Inspector. fittings pull loo
20、se when subjected to the ultimate loads. loads shall be determined by the maximum aerodynamic drag of the hose, reception coupling and drogue of the system at the maximum design carriage speed for the store or 1500 pounds for up to 2 inches I.D. and 2000 pounds over 2 inches I.D., whichever is highe
21、r. The proof load shall be 1-1/2 times the design limit load. limit load. The accuracy of these 3.2.5.9 Strength. The hose assembly shall not break nor shall its end The design limit The ultimate load shall be 2-112 times the design 3.2.5.10 ,Concentricity. A ball with a diameter of 94.6 percent of
22、the hose nominal inside diameter shall be able to pass freely through the hose while subjected to a vacuum of 20 inches of mercury. 3.2.5.11 Elongation. load shall not exceed 4.0 percent. shall have no effect on the aerial refueling system cooperation. The designer of the aerial refueling system mus
23、t specify any stricter requirements if needed for the system operation. The elongation when subjected to the proof tensi le The elongation or permanent elongation 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-H-4q75D 47 m 7979706 0270527 h a
24、 e a MIL-H-4495D 3.2.5.11.1 fermahent elongation. The permahent elongation shall oe exceed the following values at the conditions specified: a. 1.5 percent of total length when subjected to proof load for a period of one hour. b. 2.0 percent of total length when subjected to proof load for 10 second
25、 duration repeated 500 times. 3.2.5.12 Pressure. The design operatihg pressure shall be 120 psig or higher if specified by the aerial refueling system designer. pressure shall be two times the operating pressure, and the burst pressure shall be three times the operatjng pressure. The hose assembly s
26、hall be sati sfactory for surge pressure-s generated by a 0.2 second tloing (constant rate) gate valve closing against full flaw at 50 psig it a distaride of 5 feet from the outlet end of the hose, The proof 3.2.5.12,l Alternate pressure. As ah alternate to the above, the proof pressure may be a hyd
27、rostatic pressure test f 500 psig for 5 minutes and an ultimate hydrostatic pressure of 1000 psig fdr 1 minute Mithout showing any sign of failure or leakage. 3.2.5.13 Pressure drop. The pressure drop shall be the minimum consistent with qual i ty hose manufacture. shall be specified for the specifi
28、c aerial refueling system. The actual pressure drop shall be determined for the rated flow of the system and shall be recorded as psi per foot of length based on JP-5 in accordance with MIL-T-5624 at a specific gravity of 0.845. The Maximum al lobable pressure drop 3.3 Marking. 3.3.1 Hose identifica
29、tion. Each length of hose shall hve a continuous red marking strip, resistant to fuel in accurdante with MIL-M-6002, and approximately 3/8 inch wide running the entire length of hosei The cure rt, serial number, part number, and manufacturers code idehtifitation number shall be indicated by permanen
30、t type markihg at three locations (the center f each length and 4 feet from each end). 3.3.2 Cure date The cure date shall be indicated in quarters of year and year; i .e., 3/81 which indicates July through September 1981. 3.3.3 Color and markings. The hose shall be black in color with white weather
31、-resistant neoprene rubber bands vulcanized into the hose at th following intervals: every 10 feet +6 inches a 12 inch band for the full length of the hose, the first of which shall be 11 feet from the reception coupling end fitting; throughout the nominal fuel flowing range between ach 12 inch wide
32、 band there shall be 4 bands 3 inches wide spaced at 2 foot 1 inch intervals from the center of the wide bands. f Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-4q75D 47 W 777770b 0270530 2 MIL-H-4495D 3.4 Age. Age controls for the hose shall
33、be in accordance with MIL-STD-1523. 3.5 Workmanship. The workmanship displayed in fabrication and assembly of the hose assemblies shall be such as to assure, within design limitations, the ability of the hose assemblies to meet their performance requirements under al 1 applicable environmental condi
34、tions specified herein. The standards of workmanship exhibited in the approved first article sample, subject to any qualification stated in the Governments notice of approval, shall be determinative of the requirements of the contract relative to workmanship. 4. QUALITY ASSURANCE PROVISIONS 4.1 Resp
35、onsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other
36、faci 1 i ties sui table for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and ser
37、vices conform to prescribed requirements. 4.2 Classification of inspections. The inspections of the hose assemblies shall be classified as follows: a. First article inspection (see 4.3). b. Quality conformance inspection (see 4.4). 4.3 First article inspection. The first article test unit shall be p
38、roduced to production drawings, uti 1 izing production manufacturing techniques and production tooling and equipment. manufactured with an extended 7-1/2 foot length. The first article inspection shall consist of all inspections indicated in Table I in the order listed. The first article inspection
39、report format shall be in accordance with MIL-STD-831 (see 6.3). The first article test unit shall be 4.4 Quality conformance inspection. Qual i ty conformance inspection shall consist of the following inspections: a. Individual inspections (see 4.4.1). b. Sampling inspections (see 4.4.2). 4.4.1 Ind
40、ividual inspections. Individual inspections are those inspections conducted on each hose assembly. Individual inspections shall consist of the inspections in Table II in the order listed. Failure to pass any of these inspections shall be cause for rejection of the hose assembly. Provided by IHSNot f
41、or ResaleNo reproduction or networking permitted without license from IHS-,-,-hIL-H-4495D 47-i 9999906 0270531 4 = MI L-H-4495D TABLE I. First article and sampl i ng inspections. Tests Fu1 1 Length Specimen Exami nation of Product Concentri ci ty/Bulge Proof Pressure Electrical Continuity Pressure D
42、rop Elongation Permanent El ongat ion Strength 7-1/2 Foot Section Flexi bi 1 i ty :rush Resi stance 4dhes i on Test paragraph 4.6.1 4.6.3, 4.6.4 4.6.2 4.6.5 4.6.6 4.6.7 4.6.7.1 4.7 4.8, 4.8.1 4.9 4.10 Inspec first arti cl e X X X TABLE II. Individual inspections. i on Sampling X X X X X X X I Tests
43、I Test paragraph Examination of Product Concentri ci ty Proof Pressure Strength (proof load) El ongat i on Electrical Continuity 4.6.1 4.6.3 4.6.2 4.7 4.6.7 4.6.5 4.4.2 Sampling inspections. The contractor shall furnish samples from each lot for inspections indicated in Table I in the order listed.
44、shall be selected by the Government Inspector without preliminary inspection or repair. For the purpose of this paragraph, the lot size shall be set by the contractor, consistent with production and test capabilites, which will meet the contract delivery schedule and be in accordance with MIL-STD-10
45、5 inspection level S-1, acceptance number zero, Acceptance Quality Level 6.5. Sample hoses shall be in addition to the contract quantity. The contractor shall manufacture all hoses in each lot prior to the selection of the sample hoses to be tested and hoses in that lot shall not be shipped until sa
46、tisfactory completion of the tests. tests shall be cause for rejection of all hoses in that lot. Sampling inspection report format shall be in accordance with MIL-STD-831 (see 6.3). The hoses Failure of a hose to pass all sampling 9 Provided by IHSNot for ResaleNo reproduction or networking permitte
47、d without license from IHS-,-,-MIL-H-4475D 47 W 7777706 0270532 6 W MIL-H-4495D 4 i.e., through threads or flanges or other as appropriate. The tensile load shall be applied at the rate of one inch per minute. The hose and Provided by IHSNot for ResaleNo reproduction or networking permitted without
48、license from IHS-,-,-MIL-H-4495D fittings shall withstand the u1 timate loads without breaking or end fittings pulling- loose. The hose shall then be loaded until failure and the mode of failure ahd load shall be recorded. 4.8 Flexibility. section of hose. having a diameter of six times the-nominal
49、hose inside diameter or 12 inches, whichever is greater. hose while wrapped on the drum and no cross-sectional deformation of the hose shall occur. A 5 foot section of hose is cut from the 7-1/2 foot A tensile load of 1200 pounds shall be applied to the The 5 foot section of hose shall be wrapped around a drum 4.8.1 Low temperature flexibility. The 5 foot section of hose shall be bent into a U shape about a drum having the same diameter as in the a
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