1、MIL-R-52B99B 37 I 7977706 0286775 5 m- MIL-R-52899B(ME) 8 July 1986 SUPERSEDING MIL-R-52899A(ME) 30 August 1978 MILITARY SPECIFICATION This specification is approved for use within the USA Belvoir Research, Development, and Engineering Center, Department of the Army, and is available for use by all
2、Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a lightweight portable loading ramp which is used in conjunction with 4000-pound capacity, rough terrain and depot forklift trucks for loading and unloading between the, ground and the floors of MILV
3、ANS and refrigerated containers. 1.2 Classification. Portable loading ramps shall be the following types, as specified (see 6.2). Type I - Aluminum with aluminum grating. Type II - Aluminum with steel grating. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and han
4、dbooks. The following specifications, standards, and handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) an
5、d supplement thereto, cited in the solicitation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Belvoir Research, Development, and Engineering Center, ATTN: STRBE-TSE, Fort Belvoir, VA 22060-56
6、06 by using the self-addressed Standardization Document improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. USA AMSC NIA FSC 3990 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. E I_ THIS DOCUMENT CONTAINS -i(,- PAGES. Provided by
7、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-52899 B (ME SPECIFIC AT1 ONS FEDERAL QQ-S-7 81 R-C-271 PPP-B-6 01 - Strapying,.Steel, and Seals. - Chains and Attachements, Welded and Weldless. . - Boxesj Wood, Cleated-Plywood. MIL I TAY aL-P -116 MIL-B-12
8、 1 MIL-G-3859 MIL-T-22085 STANDARDS FEDERAL FED-STD-H28 FED-STD-595 - Preservation Methods of. - Barrier Material, Greaseproofed, Waterproofed, Flexible. - Grease Guns, Hand-Operated, Lever, Push and Screw Type. - Tape, Adhesive, Preservation and Sealing, - Screw-Thread Standards for Federal Service
9、s. - Colors. MILITARY MIL- STD- 105 MIL- STD-12 9 MIL- STD-130 MIL-STD-209 MIL-STD-889 - Sampling Procedures and Tables for - Marking for Shipment and Storage. - Xdentification Marking of US Ylitary - Slinging and Tiedown Provisions for Lifting - Dissimilar Metals. . Inspection by Attributes. Proper
10、ty. and Tying Down Military Equipment. (Copies of specifications and standards required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Other publications. The following documents form
11、a part of this specification to the extent specified herein, Unless otherwise specified, the issues of the documents which are 1)OD adopted shall be those listed in the issue of the DoDISS specified in the solicitation. issues of documents not listed in the DoDISS shall be the issue of the nongovern
12、ment documents which is current on the date of the solicitation. Unless otherwise specified, the 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-52899B 39 W 9999906 028b997 9 MIL-R-52899 B( ME ) AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) AN
13、SI/AWS D1.l ANSI/AWS D1.2 Structural Welding Code - Steel, Section 5, Qualification. Structural Welding Code - Aluminum, Section 5, Qualification of Procedures and Personnel. (Application for copies should be addressed to the American National-Standards Institute, 1430 Broadway, New York, NY 0018.)
14、AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 3951 Standard Practice or Commercial Packaging. (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 9103,) SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) SAE Handbook. (Applicatio
15、n for copies should be addressed to the Society of Automotive Engineers, 400 Commonwealth Drive, Warrendale, PA 15096.) (Nongovernment standards and other publications are normally available from the organizations which prepare or which distribute the documents. documents also may be available in or
16、 through libraries or other informational services.) These 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. applicable laws and regulations unless a qecific exemption has
17、been obtained. Nothing in this specification, however, shall supersede 3. WQUIWMENTS 3.1 Description. The vehicle loading ramp, hereinafter referred to as “ramp“, shall be a basic aluminum structure with steel or aluminum grating as specified (see 1.2), and shall have a manually operateu hydraulic s
18、ystem for vertical positioning. detachable towbar, both of which may be steel construction. The ramp shall be equipped with a carrier assembly and 3.2 First article. Unless otherwise specified (see 6.2), a sample shall be subjected to first article inspection (see 4.3 and 6.3). deviations of ramps f
19、rom the approved first article during production will be subject to the approval of the contracting officer. Approval of the first article will not relieve the contractor of nis obligation to furnish ramps conforming to this specification. Any changes or 3 Provided by IHSNot for ResaleNo reproductio
20、n or networking permitted without license from IHS-,-,-3,3 Materials. Material shall be as.specified herein. Materials not specified shall be selected by the contractor and shall be subject to all provisions of this specification. 3.3.1 Material deterioration prevention and control. The ramp shall b
21、e fabricated from compatible materials, inherently corrosion resistant or treated to provide protection against the various forms of corrosion and deterioration that may be encountered in any of the applicable operation and storage environment to which the ramps may be exposed. 3.3.1.1 Dissimilar me
22、tals. Dissimilar metals shall not be used in intimate contact with each other unless protected against galvanic corrosion. Dissimilar metals and methods of protection are defined and detailed in MIL-STD-889. 3.3.1.2 Identification of materials and finishes. The contractor shall identify the specific
23、 material, material finish or treatment for use with component and subcomponent, and shall make information available upon request to the contracting officer or designated representative. 3.3.2 Recovered materials. For the purpose of this requirement, recovered materials ark those materials which ha
24、ve been collected from solid waste and reprocessed to become a source of raw materials, as dis-tinguished from virgin raw materials, The components, pieces and parts incorporated in the ramps may be newly fabricated from recovered materials to the maximum extent practicable, provided the ramps produ
25、ced meets all other requirements of this specification. Used, rebuilt or remanufactured components, pieces and parts shall not be incorporated in the ramps. 3.4 Design and construction. The ramp shall be designed to perform in accordance with the requirements of 3.7 for carrier floor heights ranging
26、 from 45 to 65 inches above ground level. designed to preclude a crown on the deck and shall be in a level position when the lip is at a height of 62 inches +1-i/2 inches. The overall length of the ramp shall be 36 feet including a level-off section of at least 6 feet, The overall width of the ramp
27、shall be not more than 96 inches with a usable width of not less than 88 inches except as specified herein. The upper end of the ramp shall have a solid lip of not less than 14 inches to support the ramp on the carrier floor. than 87 inches with a usable width of 84 inches. The ramp, from a point no
28、 more than 36 inches from the forward edge of the lip, shall be tapered to the rear Edge of the lip. pounds. people manually to other location over semi-improved surfaces. be equipped with tow safety chains with grabhooks to secure the ramp to the carrier or dock (see 3.8). reflectors near each end.
29、 prevent run-off of operating equipment while on the ramp. The safety curbs shall have a height of not less than 12 inches. be essentially vertical and shall slope no more than 1 inch in 12 inches of height. The top edges of the curb shall have a radius of not less than .50 inch. moving the ramp sha
30、ll be located approximately at the center of balance under- The level-off section of the ramp shall be The overall width of the lip for the ramp shall be not more The gross weight of the ramp shall be not more than 6000 The ramp shall be equipped with handholds for positioning by four The ramp shall
31、 The ramp shall be equipped with side mounted The ramp design shall provide for safety curbs to The contour of the curb shall The ramp shall have a rated capacity of 16,000 pounds. The wheels for 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-neat
32、h the ramp and shall be connected to the hydraulic actuating system so that the ramp can be utilized through the full height range without the wheels acting as load supports. 3.4.1 Deck. The approach at both ends of the deck shall consist of an integral safety tread plate. The approach edges of the
33、tread plates shall be beveled. grating shall be an “all weather, self-cleaning, and draining type“, with the top surface fully serrated to provide traction for forklift truck tires under all weather conditions. the top surface of the grating. All other deck surfaces shall consist of open-type gratin
34、g. The The grating holddown fastener shall not project above 3.4.2 Hydraulic system. from 45 to 65 inches above ground level shall be accomplished by a manually operated hydraulic system. through this range within 150 seconds. means for filling and draining and an overload relief valve to protect th
35、e hydraulic system from damage due to overload. for drainage into a vessel. protected position. The pump lever socket shall be positioned for ease of access and operation. operate the pump against relief pressure shall be not more than 25 pounds. Vertical positioning of the ramp through a range The
36、system shall be capable of elevating the ramp The hydraulic system shall incorporate a The drain shall have provision The pump shall be recessed and located in a The force required at the grip end of the pump lever to 3.4.2.1 Cylinders. Hydraulic system cylinders shall have an exclusion device The t
37、o prevent foreign material and fluids from entering around the piston rod. rod shall be hard chrome plated to prevent corrosion. rod surface roughness shall be not more than 32 micro-inches. After plating, maximum 3.4.3 Wheels. Wheels shall be industrial or automotive type and shall be mounted on ta
38、pered roller bearings. and prevent entry of water or contaminants. Seals shall be provided to retain grease 3.4.4 Tires. Each wheel shall be provided with a pneumatic tire. Tire loading shall not exceed the tire manufacturers rating for the application. The recommended tire pressure shall be stencil
39、ed in 1-inch high (minimum) characters near the tires and labeled: “TP PSI“. - 3.4.5 Suspension system, A coil or air spring suspension system shall be provided to permit towing of the ramp at speeds up to and including 25 miles per hour (see 3.7.4). the towing position and in the operating position
40、 by one man without the use of tools. operating position. require repositioning for the towing or operating positions, shall be provided to prevent bottoming of the air spring. Coil springs shall be pin-connected to permit placement in Means shall be provided to retain the springs clear of the groun
41、d in the A resilient pad(s) Air springs shall be attached to the ramp and shall not 3.4.6 Tow bar. The ramp shall be equipped with a detachable tow bar for towing. to the ramp. The device shall be not separable from the towbar without the use of hand tools. than 3 inches and the center of the towing
42、 eye shall extend a distance of not The tow bar shall be equipped with a quick-lock device for attachment The towing eye of the bar shall have an inside diameter not less 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-528978 37 m 777770b 028
43、7000 3 m less than 48 inches from the edge of the ramp. of 28 inches, the ramp shall be approximately level. With the towing eye at a height The tow bar shall be I stowed beneath the ramp where it shall be easily accessible. 3.4.7 Lubrication. All surfaces requiring lubrication shall be provided wit
44、h a suitable means for lubricating. 3.5 Maintainability. All assemblies shall be accessible for servicing repair and replacement as appropriate. The number of different sizes of fasteners and plugs shall be held to a minimum. 3.5.1 Lubrication fittings. Lubrication fittings shall conform to SAE 5534
45、. Fittings shall be located in a protected position and shall be accessible to a hand-operated grease gun conforming to MLL-G-3859 with 10-inch flexible extension. Accessibility to fittings shall be provided without the removal or adjustment of accessories or parts. 3.5.2 Interchangeability. All par
46、ts from the same manufacturer shall be manufactured to such standards that will permit replacement or adjustment without modification of parts or total equipment. 3.5.3 Threads. Threads shall conform to the applicable requirements of FED-STD-HZ8. 3.5.4 Fastening devices. All nuts, bolts, pins, and s
47、imilar parts shall be installed with adequate means for preventing them from loosening or becoming out of adjustment. All fastening devices subject to removal or adjustment shall not be swaged, peened, staked, or otherwise permanently deformed. 3.5.5 Instruction plates. Each ramp shall be equipped w
48、ith instruction plates or diagrams, including warnings and cautions, describing any special or important procedures to be followed in assembling, operating, or servicing the ramp. visible and legible. Plates shall be attached in a location where the plate shall be both 3.6 Transportability. 3.6.1 Sl
49、inging provisions. Permanently affixed slinging provisions that enable the ramp to be lifted in its normal travel position shall be provided and shall conform to MIL-STD-209. when such provisions conform to MIL-STD-209. Slinging provisions may also be used as tiedowns 3.6.2 Tiedown provisions. Permanently affixed tiedown provisions that permit fastening the ramp to the floor or deck of a transportation medium shall be provided and shall conform to MIL-STD-209.
