1、Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandardsnavy.mil, with the subject line “Document Comment”. Since contact
2、information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. AMSC N/A FSC 4720 INCH-POUND MIL-DTL-17902G(SH) 13 August 2013 SUPERSEDING MIL-H-17902F(SH) 23 December 1988 DETAIL SPECIFICATION HOSE, END FITTINGS AND
3、HOSE ASSEMBLIES, SYNTHETIC RUBBER, AIRCRAFT FUELS This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers both aircraft fuel,
4、synthetic rubber collapsible and noncollapsible hose assemblies and end fittings. 1.2 Classification. 1.2.1 Part or identifying number (PIN). The military part number for the hose and end fittings covered by this specification should consist of the letter “M”, the basic number of the specification,
5、and the coded numbers or letters as shown in the following examples: Hose and Hose Assembly M Prefix Specification Number Hyphen Size (Diameter) Hyphen Hose Type Hyphen Length M 17902 - A - CCA - 50 Hose Fitting M Prefix Specification Number Hyphen Size (Diameter) Hyphen Fitting Type M 17902 - A - F
6、M 1.2.1.1 Hose, fitting, and hose assembly size. Size should be identified by a letter symbol as shown in table I (see 6.2). TABLE I. Size designation. Symbol Size (id) (inch) A 1 B 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH)
7、 2 1.2.1.2 Hose and hose assembly type. Type should be identified by a two-letter symbol as shown in table II (see 6.2). TABLE II. Hose type designation. Symbol Hose type/configuration CCA Collapsible hose assembly CCH Collapsible hose only NCA Noncollapsible hose assembly NCH Noncollapsible hose on
8、ly 1.2.1.3 Hose fitting type. Type should be identified by a two-letter symbol as shown in table III (see 6.2). TABLE III. Fitting type designation. Symbol Fitting type FM Fitting, male FF Fitting, female 1.2.1.4 Hose and hose assembly length. Length should be identified by a two-number symbol as sh
9、own in table IV. TABLE IV. Hose and hose assembly length. Symbol Length (feet) (nominal) (1% of nominal length) 25 25 50 50 75 75 Unless otherwise specified (see 6.2), the length of bulk hose or hose assemblies should be 50 feet, nominal. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in
10、this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document
11、users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a
12、part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-H28 - Screw-Thread Standards for Federal Services FED-STD-162 - Hose, Rubber, Visual Inspection Guide for Provide
13、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 3 DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-6855 - Rubber, Synthetic, Sheets, Strips, Molded or Extruded Shapes, General Specification for MIL-PRF-24667 - Coating System, Non-Skid, for Ro
14、ll, Spray, or Self-Adhering Application MIL-DTL-83420 - Wire Rope, Flexible, for Aircraft Control, General Specification for (Copies of these documents are available online at http:/quicksearch.dla.mil/ or https:/assist.dla.mil.) 2.3 Non-Government publications. The following documents form a part o
15、f this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM A313/A313M - Standard Specification for Stainless Steel Spring Wire ASTM B16/B16M - Standard Specification for Free-Cutti
16、ng Brass Rod, Bar and Shapes for Use in Screw Machines ASTM B121/B121M - Standard Specification for Leaded Brass Plate, Sheet, Strip, and Rolled Bar ASTM B129 - Standard Specification for Cartridge Brass and Cartridge Case Cups ASTM B176 - Standard Specification for Copper Alloy Die Castings ASTM B2
17、83/B283M - Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed) ASTM B453/B453M - Standard Specification for Copper-Zinc-Lead Alloy (Leaded-Brass) Rod, Bar, and Shapes ASTM D156 - Standard Test Method for Saybolt Color of Petroleum Product (Saybolt Chromometer Method) ASTM D
18、380 - Standard Test Methods for Rubber Hose ASTM D381 - Standard Test Method for Gum Content in Fuels by Jet Evaporation ASTM D412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers Tension ASTM D413 - Standard Test Methods for Rubber Property Adhesion to Flexible Substrate A
19、STM D471 - Standard Test Method for Rubber Property Effect of Liquids ASTM D573 - Standard Test Method for Rubber Deterioration in an Air Oven ASTM D1149 - Standard Test Methods for Rubber Deterioration Cracking in an Ozone Controlled Environment ASTM D2276 - Standard Test Method for Particulate Con
20、taminant in Aviation Fuel by Line Sampling ASTM D6779 - Standard Classification System for and Basis of Specification for Polyamide Molding and Extrusion Materials (PA) ASTM E8/E8M - Standard Test Methods for Tension Testing of Metallic Materials (Copies of these documents are available from ASTM In
21、ternational, 100 Barr Harbor Dr., P.O. Box C700, West Conshohocken, PA 19428-2959 or online at www.astm.org.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 4 2.4 Order of precedence. Unless otherwise noted herein or in the contra
22、ct, 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 unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article
23、. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.2. 3.2 Material. Material shall be new and unused. The hose shall have been manufactured not more than 12-18 months prior to date of delivery. 3.2.1 Tube. The tube shall be made of a ru
24、bber compounded for resistance to deterioration by aromatic and jet fuels and shall contain no phosphate plasticizers. 3.2.2 Cover. The cover shall be made of a rubber compounded for resistance to deterioration caused by atmospheric oxygen and ozone, sunlight, abrasion, and fuels. The cover shall be
25、 designed to withstand exposure and durability to rubbing against shipboard flight deck non-skid materials as specified in MIL-PRF-24667. 3.2.3 Reinforcement. The reinforcement may be of nylon, polyester, or high tenacity rayon that shall meet the requirements of this specification. 3.2.3.1 Wire hel
26、ix (type NCA/NCH hose). The wire in the helix shall be heavily galvanized or copper plated steel with a diameter of not less than 0.035 inch. The cross-sectional area of wire per linear inch shall be determined based on the adaptability of the hose to cognizant fittings and successful completion of
27、all testing parameters. The tensile strength of the wire shall be not less than 200,000 pounds per square inch (psi) (see 4.5.9.1). The wire shall show no defects in the steel (see 4.5.9.2). Flaking or peeling of the galvanized or copper coating on the wire shall not be considered a defect. 3.2.4 Fr
28、iction or filler. The friction or filler used to impregnate the reinforcement shall be made of a rubber compounded for resistance to deterioration by aromatic and jet fuels. 3.2.5 Couplings and fittings. The materials for the couplings and contact assembly shall be as specified in table V. TABLE V.
29、Materials for couplings and contact assembly. Part no. Name of part 1/ Material Applicable document 1 Contract button Brass ASTM B16/B16M 2 Spring CRES ASTM A313/A313M, Type 302 3 Front nut Brass ASTM B16/B16M 4 Spider Molded nylon ASTM D6779 5 Contact rod Brass ASTM B16/B16M 6 Washer Brass ASTM B12
30、1/B121M 7 Contact rod guide Brass ASTM B453/B453M 8 Lead washer Virgin lead ASTM B129 9 Double securing nut Brass ASTM B16/B16M 10 Cable connector bolt Brass ASTM B16/B16M 11 Coupling body, male Brass, forging ASTM B283/B283M UNS C37700 12 Coupling sleeve Brass, pressure die casting ASTM B176 UNS C8
31、7900 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 5 TABLE V. Materials for couplings and contact assembly Continued. Part no. Name of part 1/ Material Applicable document 13 Coupling grip Brass wire cold worked (58 percent minim
32、um copper) 14 Gasket Buna-N MIL-R-6855, Class 1, Grade 805 15 Cable, control 2/ 16 Swivel nut Brass, forging ASTM B283/B283M 17 Coupling body, female Brass, forging ASTM B283/B283M UNS C37700 NOTES: 1/ Part numbers correspond to figure 1 through figure 5. 2/ The control cable shall be in accordance
33、with MIL-DTL-83420, Type II, Composition B. 3.3 Construction. 3.3.1 Hose. Both Type CC and Type NC hose shall consist of the following: 3.3.1.1 Type CCA/CCH hose: a. Inner tube of seamless extruded rubber. b. Two or more layers of braided reinforcement. c. Outer cover of rubber. d. Optional breaker
34、plies of rubber-impregnated fabric may be used at the option of the manufacturer. e. Optional protective external cover for improved durability. 3.3.1.2 Type NCA/NCH hose: a. Inner tube or wrapped or seamless extruded rubber. b. Two or more layers of braided or spiral wrap reinforcement. c. Outer co
35、ver of rubber. d. Optional breaker plies of rubber-impregnated fabric may be used at the option of the manufacturer. e. Optional protective external cover for improved durability. f. Type NCA/NCH hose shall include a helix of round wire. The helix shall be thoroughly embedded in rubber, shall be bet
36、ween the layers of reinforcement, and shall not contact either the inner nor outer layer of reinforcement. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 6 3.3.2 Physical properties. 3.3.2.1 Physical properties of the hose. The ho
37、se shall meet the physical properties specified in table VI. TABLE VI. Physical properties of hose. Physical property Hose type Test CC NC Size Size B A B Inside diameter (in) 0.063 2 1 2 4.5.1 Outside diameter (in) 0.063 3 2 3 4.5.1 Tube thickness (in), min. 0.063 0.063 0.063 4.5.1 Cover thickness
38、(in), min. 0.063 0.094 0.094 4.5.1 Hose length (ft), nominal 50 50 50 4.5.1 Hose weight (lbs), max. 100 85 125 4.5.2 Proof test pressure (psi), min. 300 300 250 4.5.4 Burst test pressure (psi), min. 600 600 500 4.5.5 Vacuum (in Hg), Type NC only 22 22 4.5.3 Flattening test, Type CC only (cycles) 100
39、,000 4.5.11 3.3.2.2 Physical properties of rubber components. The rubber components of the hose shall meet the physical properties specified in table VII (see 4.5) TABLE VII. Physical properties of rubber components. Properties Requirements Test Tube Cover Friction compound on reinforcement plies In
40、itial properties: Tensile strength (psi), min. Ultimate elongation (%), min. 2600 300 1800 300 4.5.8.1.1 4.5.8.1.1 Adhesion, minimum, pounds per inch width: Between tube and breaker ply Between cover and reinforcement ply Between reinforcement plies and filler on wire helix 20 15 15 4.5.8.2.1 4.5.8.
41、2.1 4.5.8.2.1 Properties after immersion in medium no. 6: Tensile strength (psi), min. Ultimate elongation (%), min. 1400 200 800 150 4.5.8.1.2 4.5.8.1.2 Adhesion, minimum, pounds per inch width: Between tube and breaker ply Between cover and reinforcement ply Volume increase (%), max. (no shrinkage
42、 allowed) 12 30 8 30 30 4.5.8.2.2 4.5.8.2.2 4.5.8.3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 7 TABLE VII. Physical properties of rubber components Continued. Properties Requirements Test Tube Cover Friction compound on reinf
43、orcement plies Properties after oven aging: Tensile strength (psi), min. Ultimate elongation (%), min. 2000 250 1450 220 4.5.8.1.3 4.5.8.1.3 Resistance to ozone of hose cover No cracks 4.5.8.4 Resistance to non-skid on hose cover No cracks, revealing reinforcement threads 4.5.12 Nonvolatile extracta
44、ble material in hose tube (%), max. 2.0 4.5.8.5 Saybolt color number of test fluid in hose tube, min. +15 4.5.8.6 3.3.3 Hose assembly. When hose assemblies are being fabricated, each length of hose shall have one Type FM and one Type FF fitting attached. Two spider assemblies and a length of control
45、 cable shall be fitted to the hose assembly as shown on figure 1. 3.3.3.1 Hose fittings. Fitting Types FF and FM shall be of the reusable compression grip type consisting of an internal tailpiece, an external, long tapered sleeve, and a brass wire helix grip. The fittings shall not exceed the dimens
46、ion of figure 1 and shall not have any sharp protruding edges which could damage the hose. The Type FM fitting shall be as shown on figure 1 and figure 2 and the Type FF fitting shall be as shown on figure 1 and figure 3. Threads shall be in accordance with FED-STD-H28. Female swivels shall not be h
47、eld in place with compression wire retainers. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 8 FIGURE 1. Hose and control wire assembly. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
48、-,-,-MIL-DTL-17902G(SH) 9 FIGURE 2. Male coupling dimensions. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 10 FIGURE 3. Partial detail of female coupling end. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-17902G(SH) 11 3.3.3.2 Spider assemblies. Spider assemblies and components shall be in accordance with figure 1, figure 4, and figure 5. Spiders shall be molded nylon in accordance with ASTM D6779. FIGURE 4. Contact assembly. Provide
