1、MIL-V-24761 41 = 9999906 -0484292 8 INCH-POUND MIL-V-2476 1 (SH) 17 June 1991 MILITARY SPECIFICATION VENTILATING SETS, PORTABLE DAMAGE CONTROL This speccation is approved for use by the Naval Sea Systems Commnnd, Department of the Navy, and is available for use by all depastments and agencies of the
2、 Department of Defense. 1. SCOPE 1.1 Scope. This specification covers Navy standard portable damage control ventilating sets. Navy standard portable damage control ventilating sets are either electric-motor driven vaneaxial fans or air-turbine driven centrifugal fans. 1.2 Classification. Navy standa
3、rd portable damage control ventilating sets, herein referred to as fans, shall be of the following classes as specified (see 6.2): Class 0-1/2A Class 0-1/2D Class 0-3/4T Type O, size 1/2, alternating (A) current motor driven vaneaxial fan Type O, size 1/2, direct (D) current motor driven vaneaxial f
4、an Type O, size 3/4, air-turbine (T) driven centrifugal fan. 2. APPLICABLE DOCUMENTS 2.1 Government documents, 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specifie
5、d, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of u
6、se in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/
7、A FSC 4140 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24761 41 9999906 0484293 T m SPECIFICATIONS FEDERAL FF-B-171 FF-N-836 FF-S-85 FF-S-86 FF-S-92 FF-s-200
8、FF-W-84 FF-W-92 PPP-F-320 QQ-A-22517 QQ-A-25017 QQ-A-25018 QQ-A-250111 QQ-A-430 QQ-A-596 QQ-Ad01 IT-E-489 IT-P-645 TI-V-119 MIL-V-24761 (SH) Bearings, Ball, Annular (General Purpose) Nut: Square, Slotted, Castle, Knurled, Welding and Single Ball Seat Screw, Cap, Slotted and Hexagon Head Screw, Cap,
9、Socket-Head Screw, Machine: Slotted, Cross-Recessed or Hexagon Head Setscrews: Hexagon Socket and Spline Socket, Headless Washers, Lock (Spring) Washer, Flat (Plain) Fiberboard; Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes Aluminum Alloy 5052, Bar, Rod, and Wire; Rolled, Drawn
10、, or Cold Finished Aluminum Alloy 5086, Plate and Sheet Aluminum Alloy 5052, Plate and Sheet Aluminum Alloy 6061, Plate and Sheet Aluminum Alloy Rod and Wire; For Rivets and Cold Heading Aluminum Alloy Permanent and Semipermanent Mold Castings Aluminum Alloy Sand Castings Enamel, Alkyd, Gloss, Low V
11、OC Content Primer, Paint, Zinc Molybdate, Alkyd Type Varnish, Spar, Phenolic-Resin 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24761 41 m 9999906 0484294 1 MILITARY MIL-P-116 MIL-S-901 MIL-E-917 MIL-s-1222 MIL-E-2036 MIL-P-15024 MIL-P- 15
12、024/5 MIL-C-16173 MIL-E- 16298 MIL-M-17060 MIL-M- 17413 MIL-M-17556 MIL-L-19140 MIL-S-23769 DOD-G-24508 STANDARDS MILITARY MIL-STD-108 Preservation, Methods of Shock Test, HI (High-Impact); Shipboard Machinery, Equipment and Systems, Requirements for Electric Power Equipment, Basic Requirements Nava
13、l Shipboard Use Studs, Bolts, Hex Cap Screws and Nuts Enclosures for Electric and Electronic Equipment Plates, Tags and Bands for Identification of Equipment Plates, Identification Corrosion Preventive Compound, Solvent Cutback, Cold-Application Electric Machines Having Rotating Parts and Associated
14、 Repair Parts: Packaging of Motors, 60 Hertz Alternating Current Integral HP (Shipboard Use) Motors, Direct Current, Integral HP, Naval Shipboard Motor, Direct-Current, Fractional HP, Shipboard Use Lumber and Plywood, Fire-Retardant Treated Seals, Security Grease, High Performance, Multipurpose (Met
15、ric) Definitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment MIGSTD-167-1 Mechanical Vibrations of Shipboard Equipment (Type - I - Environmental and Type II - Internally Excited) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
16、 from IHS-,-,- - MIL-V-24761 41 4979906 0484275 3 m MIL-STD-278 Welding and Casting Standard MIL-STD-461 Electromagnetic Emission and Susceptibility Requirements for the Control of Electromagnetic Interference MIGSTD-462 Electromagnetic Interference Characteristics, Measurement of MIL-STD-889 Dissim
17、ilar Metals (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 191 11-5094.) 2.1.2 Other Government documents, drawings, and publications. The
18、 following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. DRAWINGS NAVAL SEA SYSTEMS COMMAND (NAVSEA) 803-607819 Hose 8, 10, 16 Inch and Rack for Portable
19、Ventilating Sets 803-921 629 Ventilating Set, Portable, Electric Motor Driven 803 -92 1740 Ventilating Set, Portable, Air Turbine Driven 815-1 197047 Switch Box for Explosion-proof Ventilating Set (Application for copies should be addressed to: Commander, Portsmouth Naval Shipyard, Code 202.2, Ports
20、mouth, NH 03804.) 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwis
21、e specified, the issues of documents not listed in the DODISS shall be the issues of the documents cited in the solicitation (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) SlA(ASA 47) Sound Level Meters, Specification for 4 Provided by IHSNot for ResaleNo reproduction or networking permitte
22、d without license from IHS-,-,-MIL-V-24761 41 9999906 O484296 5 = , MIL-V-24761 (SH) (Application for copies should be addressed to the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, NY 10017.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A
23、123 A 153 A 569 B6 Standard Specification for Zinc B 633 D 2092 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products; (DOD adopted) Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware; (DOD adopted) Standard Specification for Steel, Carbon
24、 (0.15 Maximum, Percent), Hot-Rolled Sheet and Strip Commercial Quality; (DOD adopted) Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel; (DOD adopted) Standard Practice for Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting (Application for copies shoul
25、d be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) UNDERWRITERS LABORATORIES (UL) UL 547 Thermal Protectors for Motors (Application for copies should be addressed to the Underwriters Laboratories, 333 Pfingsten Road, Northbrook, IL 60062.) (N
26、on-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text
27、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. When specified (see 6.2), a sample shall be su
28、bjected to first article inspection (see 6.5) in accordance with 4.3. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-2476 1 (SH) 3.2 Materiais. Materials for use in the construction of fans shall be as specified in 3.2.1 through 3.2.11.7. Th
29、e materials shall be free from defects that might affect the serviceability or appearance of the finished product. 3.2.1 Hazardous materials. Materials for use in the construction of fans shall have no effect on the health of personnel when the materials are used for their indented purpose. Material
30、s and parts containing asbestos, cadmium, lithium, mercury, or radioactive material shall not be used. 3.2.2 Materials not specified. Except for castings, commercial materials shall be permitted for fan parts when Government specifications are not available. When not identified by Government specifi
31、cations, steel and aluminum materiais other than castings shall be identified by American Iron and Steel Institute (AISI) number or range of numbers (for example, AISI 1008- 1020) or by Aluminurn Association number (for example, 5052). Chemical or mechanical analysis shall be required only for casti
32、ngs. 3.2.3 Material thickness. Aluminum scrolls, casings, and flanges shall be not less than 0.187 inch thick. 3.2.4 Aluminum alloy parts. Parts fabricated of aluminum shall be of aluminum alloys that conform to the requirements of table I (Federal Specifications for comparable alloys are enclosed i
33、n parentheses and listed for guidance, except as noted in 3.2.2). TABLE I. Aluminum doy matenrrls. Material Plate and sheet Bars, shapes, rod, wire, and rivets Sand castings Permanent mold castings Commercial alloy 5086-H32 quarter hard 5052-H32 quarter hard 6061-T4 or T6 5052-H32 quarter hard Prefe
34、rred for welded assemblies. 6 Applicable document (QQ-A-250fl) (QQ-A-250/8) (QQ-A-250/11), T4, or T6 (QQ-A-225/7) (QQ-A-430, alloy 5052) QQ-A-601, alloys 356-0, or T6, A712.0, D712.0 or 713.0 (Tenzaloy) or equal QQ-A-596, alloy 356-T6, Tenzaloy, or equal Provided by IHSNot for ResaleNo reproduction
35、or networking permitted without license from IHS-,-,-MIL-V-24761 41 999990b 0484298 9 MIL-V-2476 1 (SH) 3.2.4.1 Tapped holes. Tapped holes in aluminum shall have the minimum quantity of threads as a nut of equal size, and the thread shall be fitted with a corrosion-resistant steel helicoidal insert.
36、 3.2.5 Steel parts. Parts fabricated of steel plate in accordance with ASTM A 569 shall be of low carbon or medium carbon steel having a surface smoothness suitable for electroplating. 3.251 Fastening hardware. Fastening hardware shall conform to the following specifications: cap screws, FF-S-85 or
37、FF-S-86, as applicable; slotted-head machine screws, FF-S-92; hexagon- socket, headless set screws, FF-s-200; bolts, MIL-S-1222; nuts, FF-N-836; lockwashers, FF-W-84; and plain washers, FF-W-92. Fxcept in non-magnetic applications that requires special hardware (see 3.2.6.2), hardware shall be of ca
38、rbon steel, plated with zinc to a minimum thickness of 0.0002 inch in accordance with ASTM A 153 and ASTM B 633, SC 1. In general, the use of commercial hardware fasteners is preferred to fewer medium or high tensile strength hardware fasteners because replacements are readily available in case of l
39、oss. 3.2.6 Nonmagnetic and nonsparking construction. Fans shall be of nonmagnetic and nonsparking construction and shall conform to the requirements of 3.2.6.1 through 3.2.6.4. 3.2.6.1 Permeability. Nonmagnetic material shall be considered as that which has a permeability of less than 2.0 in the fin
40、al condition. 3.2.6.2 Fan parts. Fan parts, including scroll or casing inlet cone, flanges, vanes, wheel, wheel hub inserts, motor mounting ring, support base, conduit, terminal connection (switch) box, bolts, nuts, washers, and fittings shall be constructed of nonmagnetic material. 3.2.63 Drives. A
41、ir-turbine and electric-motor drives shall use ferromagnetic material only in magnetic circuits. 3.2.6.4 Cast iron. Cast iron shall not be used in any part of the fans or fan components including the drives (electric-motor and air-turbine) and control devices. 3.2.7 Dissimilar metals. Electrolytical
42、ly dissimilar materials shall not come in direct contact to prevent destructive electrolysis. 3.2.7.1 Fastening hardware. Corrosion-resistant hardware fasteners shall be insulated from aluminum or aluminum alloys. Material that is water absorbent shall not be used in contact with aluminum or aluminu
43、m alloys. Self-tapping sheet metal screws shall not be used. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-V-24761 (SH) 3.2.7.2 Surface contact. Aluminum or aluminum alloy surfaces in contact with similar or dissimilar metals shall minimize g
44、alvanic corrosion as required by MIL-STD-889. In addition, faying surfaces shall be painted before assembly with one coat of zinc-chromate primer in accordance with T-P-645 and two coats of aluminum paint in accordance with T-E-489 3.2.8 Recovered materials. Unless otherwise specified herein, all eq
45、uipment, material, and articles incorporated in the products covered by this specification shall be new and may be fabricated using materials produced from recovered materials without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected or recovered
46、 from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification unless otherwise specifically specified. 3.2.9 Corrosion protection.
47、Corrosion-resistant steel (300 series), copper, and brass referenced herein shall be corrosion-resistant materials. Corrosion-resistant steel, when used in any fabrication method that tends to reduce corrosion-resisting properties, shall be normalized to restore those properties. 3.2.9.1 Corrosion p
48、rotection methods. Parts fabricated from other than corrosion-resistant materials shall be protected against corrosion with chemical treatment, electrolytic processes, plating, or specified corrosion protection methods. Such processes include, but are not limited to the following: a. Hot-dip galvani
49、ze in accordance with ASTM A 123, with the spelter conforming to grade 5 of ASTM B 6 b. Electroplating with zinc in accordance with ASTM B 633 SC4, followed by chromic treatment conforming to ASTM D 2092 c. Two coats of primer conforming to T-P-645. 3.2.9.2 Plating of mating carbon steel parts. Noncorrosion-resistant steel parts of an assembly which can be disassembled shall be plated separately. Machining of the plating shall b
