1、. 1 A-A-52546 9999974 O169910 679 W METRIC A-A-52546 v SUPERSEDING 2 May 1969 MIL-H-52079B (AT) COMMERCIAL ITEM DESCRIPTION HOSE, PREFORMED: SEMI-FLEXIBLE, REINFORCED The General Services Administration has authorized the use of this commercial item description (CID) for all federal agencies. 1. SCO
2、PE. This CID covers one type of semi-flexible preformed hose, for air induction on heavy duty engines. 2. SALIENT CHARACTERISTICS 2.1 Materials. Unless otherwise specified herein or in the applicable engineering drawing (AED) (see 6.2), the material used shall be in accordance with the manufacturers
3、 material specifications and/or drawings. The use of recovered materials made in compliance with regulatory requirements is acceptable provided that ali other requirements of this CID are met (see 3.1). 2.1.1 Rubber. Hose shall be made from rubber material in accordance with ASTM D2000. 2.1.2 Nylon.
4、 Nylon shall be in accordance with ASTM D4066. 2.1.3 m. Wire shall be in accordance with ASTM A818. Beneficial comments, recommendations, additions, deletions clarifications, etc. and any other data which may improve this document should be sent by letter to: U.S. Army Tank-automotive and Armaments
5、Command, ATTN: AMSTA-TR-EBLUE, Warren, MI 48397-5000. FSC 4720 BUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52546 7779774 OLb99LL 505 A-A-52546 2.2 Ikslgg and construc
6、t ion. Unless otherwise specified in the AED (see 6.2), the hose shall be designed and constructed in accordance with the manufacturers own drawings, specifications and standard practices. 2.3 Performance. 2.3.1 Bend&. The hose shall be installed in a contour-forming fixture and subjected to a minim
7、um radius bend of one and a half times the inside hose diameter for each of 4 separate directions spaced 90 degrees apart. The hose shall evidence no kinking, flattening, fracturing or deformation. 2.3.2 Cohpmgx&ance . A 15 centimeter (cm) (6 inch) hose sample shall evidence no damage in excess of 5
8、% in diameter after being subjected to a load of 57 kilograms (kg) (125 pounds) uniformly applied for 5 minutes. 2.3.3 Accelerated-agin? flex ibility. The hose shall withstand the accelerated-aging test specified in ASTM D573 except the temperature shall be 121 3.6 degrees Fahrenheit (OF) for a peri
9、od of 24 f .5 hours and then -54 f 1 “C (-65 period of 24 hours and flexed while at still latter temperature. After flexing, the hose shall withstand a pulsating proof pressure specified in 2.3.4 without any sign of damage. 2 degrees Celsius (OC) (250 f 2F) for a 2.3.4 Pulsat in 0 proof p ressure. T
10、he samples shall withstand without any damage a pressure of 276 kilopascals (kPa) (40 pounds per square inch (psi) applied internally at pulsating intervals of 5 seconds “on“, 3 seconds “off“ for 15 minutes. Sample shall be prepared in accordance with ASTM D380. 2.3.5 Burststrength. The hose shall s
11、how no evidence of bursting or leakage, at any pressure up to and including 517 kPa (75 psi), when subjected to a burst pressure specified in ASTM D380. 2.3.6 ms resistance . The hose shall be constructed of materials that will not support fungus growth. The sample shall not show any sign of damage
12、when subjected to fungus growth as described in ASTM D3273 and then subjected to a burst pressure as described in paragraph 2.3.5. 2.3.7 Fricti- * . The hose shall withstand a force of at least 53 Newtons (N) (12 pounds), tube to ply. The sample shall be prepared in accordance with ASTM D413. 2.3.8
13、Resistme to vacum . A 91.5 cm (36 inch) length of hose shall be assembled with end couplings. The outside diameter of the hose shall be measured and recorded. One end shall be closed in such a manner as to prevent leakage of air, and the other end shall be connected to a 2 Provided by IHSNot for Res
14、aleNo reproduction or networking permitted without license from IHS-,-,-A-A-52546 vacuum pump. The hose shall be subjected to a vacuum of 68 kPa (10 psi) or 50.8 cm of mercury (20 inches of mercury) while curved to a radius equal to 5 times the diameter of the hose. After a period of 5 minutes, and
15、with vacuum maintained, the hose diameter shall again be measured and the hose inspected. When inspected the hose shall show no evidence of damage. The sample shall be prepared in accordance with ASTM D622. 2.4 Identificb ma rkings. Identification marking shall be placed on the hose. It shall be per
16、manent and legible and shall include, as a minimum, the manufacturers identification code (CAGE), manufacturers part number and the part identification numbers (PIN) AA52546-1 (see 6.2). 2.5 Meta 1 flances. When metal flanges are specified (see 6.21, the hose shall be bonded to a metal “V” type flan
17、ge on either or both ends and shall withstand a tensile load of 1335 N (300 pounds) without separating. 3. REGULATORY REQUIREMENTS 3.1 Recove red mate rial. The offerorcontractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of Federa
18、l Acquisition Regulation (FAR). 4. QUALITY ASSURANCE PROVISIONS 4.1 Respo nsibility for inspection. The contractor is responsible for the performance of all inspections (examinations and tests). 4.2 Contractor certifw i . The contractor shall certify and maintain substantiating evidence that the pro
19、duct offered meets the salient characteristics of this commercial item description and that the product conforms to the producers own drawings, specifications, workmanship standards, and quality assurance practices. Items with known defects shall not be submitted for Government acceptance. The Gover
20、nment reserves the right to require proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract. 4.3 Wet acceptabib . The contractor shall provide products which have a proven market record based on the number of items so
21、ld, length of time the product has been on the market, and reliability and performance of the products as required under the contract or solicitation. 5. PACKAGING. Preservation, packing and marking shall be as specified in the contract or order (see 6.2). 3 Provided by IHSNot for ResaleNo reproduct
22、ion or networking permitted without license from IHS-,-,-A-A-52546 9999974 OLb99L3 388 = A-A-52546 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1. Addresses for 0btauun.g copies of ref-. 6.1.1 Non-Govenunent documents .
23、The following documents are available from the American Society for Testing and Materials (ASTM), 1916 Race Street, Philadelphia, PA 19103. a. ASTM D2000 “Standard Classification System for Rubber Products in Automotive Applications”. b. ASTM D4066 “Standard Specification for Nylon Injection and Ext
24、rusion Materials (PA)”. c. ASTM A818 “Standard Specification for Coppered Carbon Steel Wire”. d. ASTM D573 “Standard Test Method for Rubber-Deterioration in an Air Oven”. e. ASTM D380 “Standard Test Methods for Rubber Hose”. f. ASTM D3273 “Standard Test Method for Resistance to Growth of Mold on the
25、 Surface of Interior Coatings in an Environmental Chamber”. g. ASTM D413 “Standard Test Methods for Rubber Property-Adhesion to Flexible substrate”. h. ASTM D622 “Standard Test Methods for Rubber Hose for Automotive Air and Vacuum Brake System”. 6.2 OrderugiMa . Acquisition documents must specify th
26、e following: a. Title, number, and date of this CID. b. Issue of Department of Defense Index of Specifications and Standards (DODISS) to be cited in the solicitation, and if required, the specific issue of individual documents referenced. c. Applicable engineering drawing. d. If design is other than
27、 as specified. e. PIN number and quantity required. f. Selection of applicable level and packaging requirements. g. If metal flange is to be bonded on either or both ends. 6.3 Cross reference data. Preformed hose conforming to this CID are interchangeable/ substitutable with preformed hose conformin
28、g to MIL-H-52079B. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. A-A-52546 W 9999974 Olb99l4 214 W A-A-52546 MILITARY INTERESTS: Custodian: Amy - AT Review activities: Amy - CD DLA - CS CIVIL AGENCY COORDINATING ACTIVITY: GSA - FSS PREPARING ACTIVITY: Amy - AT (Project 4720-0069) 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
