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.daps.dla.mil. AMSC N/A FSC 4140 INCH-POUND MIL-PRF-24755B(SH) 19 April 2010 SUPERSEDING MIL-PRF-24755A(SH) 31 May 2001 PERFORMANCE SPECIFICATION FANS, VANEAXIAL,
3、HIGH PRESSURE, NAVAL SHIPBOARD 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 high pressure vaneaxial fans used in co
4、llective protective systems for Naval shipboard ventilation systems. 1.2 Classification. Fans are of the following type and compositions, as specified (see 3.7.1 and 6.2): Type A Vaneaxial, Fixed, Navy Standard high-impact (H.I) shock Composition M Magnetic Composition N Nonmagnetic 2. APPLICABLE DO
5、CUMENTS 2.1 General. The documents listed in 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 en
6、sure the completeness of this list, document 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 spe
7、cifications, standards, and handbooks form a 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. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-901 - Shock Tests, H.I. (High-Impact) Shipboard Mac
8、hinery, Equipment, and Systems, Requirements for MIL-DTL-17060 - Motors, Alternating Current, Integral-Horsepower, Shipboard Use MIL-B-17931 - Bearings, Ball, Annular, for Quiet Operation Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24755B
9、(SH) 2DEPARTMENT OF DEFENSE STANDARDS MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited) MIL-STD-740-2 - Structureborne Vibratory Acceleration Measurements and Acceptance Criteria of Shipboard Equipment MIL-STD-1399-300 - Electric P
10、ower, Alternating Current MIL-STD-2031 - Fire and Toxicity Test Methods and Qualification Procedure for Composite Material Systems Used in Hull, Machinery, and Structural Applications Inside Naval Submarines MIL-STD-2142 - Magnetic Silencing Characteristics, Measurement of (Metric) (Copies of these
11、documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings,
12、and publications form a 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. NAVAL SEA SYSTEMS COMMAND (NAVSEA) PUBLICATIONS S9074-AR-GIB-010/278 - Requirements for Fabrication Welding and Ins
13、pection, and Casting Inspection and Repair for Machinery, Piping, and Pressure Vessels (Copies of this document are available from the Naval Logistics Library, 5450 Carlisle Pike, Mechanicsburg, PA 17055 or online at https:/nll.ahf.nmci.navy.mil/.) 2.3 Non-Government publications. The following docu
14、ments form a 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. AIR MOVEMENT AND CONTROL ASSOCIATION, INC. (AMCA) AMCA 99-0401 - Classification for Spark Resistant Construction AMCA 111 - La
15、boratory Accreditation Program ANSI/AMCA 210 - Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating ANSI/AMCA 300 - Reverberant Room Method for Sound Testing of Fans (Copies of these documents are available from the Movement and Control Association, Inc, 30 West University
16、 Drive, Arlington Heights, IL 60004 or online at www.amca.org.) AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA) ANSI/ABMA 4 - Tolerance Definitions and Gauging Practices for Ball and Roller Bearings ANSI/ABMA 9 - Load Ratings and Fatigue Life for Ball Bearings ANSI/ABMA 13 - Rolling Bearing Vibrat
17、ion and Noise (Methods of Measuring) ANSI/ABMA 20 - Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types - Metric Design Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24755B(SH) 3(Copies of these documents are available fr
18、om the American Bearing Manufacturers Association, 2025 M. Street, NW, Suite 800, Washington DC 20036 or online at www.abma-dc.org.) AMERICAN WELDING SOCIETY (AWS) ANSI/AWS B2.1/B2.1M - Specification for Welding Procedure and Performance Qualification ANSI/AWS B2.2 - Brazing Procedure and Performanc
19、e Qualification (Copies of these documents are available from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126 or online at www.aws.org.) ASTM INTERNATIONAL ASTM B26/B26M - Standard Specification for Aluminum-Alloy Sand Castings ASTM B221 - Standard Specification for Aluminum and
20、 Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes ASTM E119 - Standard Test Methods for Fire Tests of Building Construction and Materials ASTM E662 - Standard Test Method for Specific Optical Density of Smoke Generated by Solid Materials ASTM E800 - Standard Guide for Measurement of Gas
21、es Present or Generated During Fires ASTM F1166 - Standard Practice for Human Engineering Design for Marine Systems, Equipment, and Facilities (Copies of these documents are available from ASTM International, 100 Barr Harbor Dr., P.O. Box C700, West Conshohocken, PA 19428-2959 or online at www.astm.
22、org.) INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE) IEEE 45 - Recommended Practice for Electric Installations on Shipboard (Copies of this document are available from the Institute of Electrical and Electronics Engineers, Inc., 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331 or on
23、line at www.ieee.org.) INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 3290-1 - Rolling bearings Balls Part 1: Steel balls (Copies of this document are available from ISO, 1, ch. de la Voie-Creuse, Case postale 56 CH-1211 Geneva 20, Switzerland or online at www.iso.org.) NATIONAL ELECTRICAL
24、 MANUFACTURERS ASSOCIATION (NEMA) NEMA MG 1 - Motors and Generators (Copies of this document are available from the National Electrical Manufacturers Association, 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209 or online at www.nema.org.) 2.4 Order of precedence. Unless otherwise noted herein
25、or in the contract, 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. Provided by IHSNo
26、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24755B(SH) 43. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Materials. Fan shall be of spark-resistant constructio
27、n as defined in AMCA 99-0401 Type B construction. Cast iron, excluding nodular iron, shall not be used in the construction of fans or motors that are components of fans. Materials shall be corrosion-resistant or material shall be protected against corrosion after fabrication. Material degraded durin
28、g the fabrication process shall be normalized to restore those properties before assembled in any fan. Selected materials shall be capable of meeting all of the operational and environmental requirements specified herein. 3.2.1 Composite material. 3.2.1.1 Composite fan casing. Fan casing shall withs
29、tand a full-scale fire performance test, as well as all required tests of this document when used in a fan assembly. Acceptance criteria for composite casing material shall be in accordance with the fire and toxicity performance requirements of MIL-STD-2031. 3.2.1.2 Fan internal components. Composit
30、e material used for motor, vanes, impeller, and conduit shall withstand small-scale material specimen fire tests, as well as all required tests of this document when used in a fan assembly. 3.2.2 Hazardous materials. Materials for use in the construction of fans shall have no effect on the health of
31、 personnel when the materials are used for their intended purpose. Regardless of other requirements, materials and parts containing asbestos, cadmium, lithium, mercury, or radioactive material shall not be used. 3.2.3 Fasteners. Material for all bolts, nuts, studs, screws, and similar fasteners shal
32、l be corrosion-resistant passivated or of a material rendered resistant to corrosion. Sheet metal screws shall not be used. Galling shall be prevented. Tapped holes shall be reinforced where shearing of thread can occur. 3.2.4 Nonmagnetic construction. When nonmagnetic fan-motor units are specified
33、(see 6.2), all fan parts including the casing, vanes, impeller, impeller bushing, motor mounting, fasteners, washers, conduit box, and fittings shall be of nonmagnetic material (see 6.7.1). 3.2.5 Motor material. Motor material shall conform to the requirements of IEEE 45 or NEMA MG 1 as applicable f
34、or nonmagnetic motors. 3.2.6 Dissimilar metals. Fans and components shall not be degraded by electrolysis (see 6.6). 3.2.7 Recovered materials. Unless otherwise specified herein, all equipment, material, and articles incorporated in the products covered by this specification shall be new and may be
35、fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The term “recovered materials” means materials that have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed
36、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 expressly stipulated. 3.3 Painting. Equipment and component items shall be delivered with the manufacturers standard finish, except as
37、 to comply with the requirements of 3.2. 3.4 Welding and allied processes. Surfaces of parts to be welded or brazed shall be free from rust, scale, paint, grease, and other foreign matter. Welding and allied processes shall be performed by personnel certified to American Welding Society standards AN
38、SI/AWS B2.1/2.1M and ANSI/AWS B2.2. NAVSEA Technical Publication S9074-AR-GIB-010/278 may be used for guidance. 3.5 Identification. 3.5.1 Fan identification code. The size and characteristics of Navy standard high pressure fan-motor units shall be designated by a code formed by alternate letters and
39、 numbers arranged in accordance with table I. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24755B(SH) 53.5.2 Identification plates. Permanent identification plates shall be mechanically fastened to the outside of the fan casing. Identifica
40、tion plate mounting shall not interfere with fan casing tightness. The identification plate shall contain the following information as a minimum: a. Manufacturers name and CAGE code number b. Fan identification code c. Component identification number (CID No.) d. Direction of air flow and rotation e
41、. Manufacturers serial number and drawing number The identification plate and a duplicate motor identification plate shall be installed on the outside of the fan casing. TABLE I. Fan identification code. Symbol Sequence1/Characteristics Code Meaning 1 (letter) Type of fan A Vaneaxial 2 (number) Fan
42、size For size code, see table II Nominal ft3/min. of standard air 3 (letter) Type of current A AC 4 (number) Voltage and phase 4 440 volts, 3-phase, 60 Hz AC 5 (letter) Motor enclosure W Spraytight 6 (number) Maximum ambient temperature 6 149 F (65 C) 7 (letter) Nonmagnetic construction NM 8 (letter
43、) Thermal protection TP 9 (letter) Quiet bearing QB NOTE: 1/ For example, A101A4W6-TP represents a Type A, nominal 1200 cubic feet per minute (ft3/min) vaneaxial fan at 14-inch water gauge driven by a 440-volt (V), 60-Hertz (Hz), 3-phase, alternating current (AC) spraytight, 149 F (65 C) ambient tem
44、perature, thermal protection Navy service A motor. 3.6 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts are also interchangeable or reversible with regard to function, performance, and strength. 3.7 Operating life. The equipment shall have an o
45、perating life of not less than 223,800 hours (equivalent to approximately 30 years of operation). Any part identified as planned replacement parts shall have an operating life, prior to replacement, of approximately 37,300 hours (equivalent to approximately 5 years of ship operation). 3.7.1 Reliabil
46、ity. Reliability shall meet the specified values (see 3.7). 3.8 Human engineering. The fan shall be arranged so as to achieve safe, reliable, and effective performance by the operator and maintenance personnel and to minimize personnel skill requirements. ASTM F1166 may be utilized as a guideline in
47、 applying human engineering design criteria for the fan-motor unit. 3.9 Maintainability. The fan shall be constructed so that: a. Fan impeller shall be mounted on the motor shaft in such a manner that it is removable using commonly available tools. b. Bearings shall be removable using commonly avail
48、able tools. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24755B(SH) 6c. Parts shall be match marked or attached so that reinstallation will be in the same position as originally installed. d. Motor shall be removable using commonly availab
49、le tools. 3.10 General shipboard design conditions. General shipboard design characteristics shall be as follows: a. Power source quality: In accordance with MIL-STD-1399-300. b. Able to operate satisfactorily when exposed to soaking atmospheric spray (rain or sea) or seawater. c. Perform in accordance with requirements herein in a range of ambient temperatures between -20 F (29 C) and +149 F (65 C). 3.10.1 High-impact
