1、Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Tank-automotive and Armaments Command, ATTN: AMSRD-TAR-E/268, MS-268, Warren, MI 48397-5000 by letter or emailed to standardizationtacom
2、.army.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 2540 METRIC MIL-PRF-62550E(AT) 21 November 2006 SUPERSEDING MIL-PRF-62550D(AT) 30 May 1997 PERFORMANCE SPECIFIC
3、ATION HEATER ASSEMBLY, COMBUSTION VEHICULAR COMPARTMENT, 8.8/17.6 kW (30 000/60 000 BTU/HR) GENERAL SPECIFICATION FOR This specification is approved for use by the U.S. Army Tank-automotive and Armaments Command, Department of the Army, and is available for use by all Departments and Agencies of the
4、 Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a forced draft and ventilation air personnel heater assembly, referred to as a “heater” (see 6.1). 1.2 Classification. Heaters should be of the following types and classes, as specified: Type I - Heaters that must take their combu
5、stion and ventilating air from the same source (“Single Air”). Class I - Heaters that have a nominal rating of 8.8 kilowatts (kW) (30 000 British Thermal Units per Hour Btu/hr), but are also capable of operating at a nominal heating rate of 4.4 kW (15 000 Btu/hr). Class II - Heaters that have a nomi
6、nal maximum rating of 17.6 kW (60 000 Btu/hr), but are also capable of operating at a nominal heating rate of 8.8 kW (30 000 Btu/hr). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62550E(AT) Type II - Heaters that can take their combustion
7、and ventilating air from separate sources (“Dual Air”). Class II - Heaters that have a nominal maximum rating of 17.6 kW (60 000 Btu/hr), but are also capable of operating at a nominal heating rate of 8.8 kW (30 000 Btu/hr). (Type II MIL-PRF-62550/2 can be converted to Type I MIL-PRF-62550/1) 2. APP
8、LICABLE DOCUMENTS. 2.1 General. The documents listed in this section are specified in sections 3 and 4 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 ma
9、de to ensure the completeness of this list, document users are cautioned that they must meet all specified requirement documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications
10、, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, 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 solicitatio
11、n (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE A-A-52472 - Filter, Fluid, Pressure, Automotive Fuel (10 GPH Filtration). MIL-PRF-62550/1(AT) - Heater Assembly, Combustion, Vehicular Compartment, 17.6 kW, Single Air Type (Metric). MIL-PRF-62550/2(AT) - Heater Assembly, Combustion, Vehicular Compar
12、tment, 17.6 kW, Dual Air Type (Metric). MIL-PRF-62550/3(AT) - Heater Assembly, Combustion, Vehicular Compartment, 8.8 kW, Single Air Type (Metric). MIL-PRF-32222, will be used instead of MIL- PRF-62550/3(AT). (Unless otherwise indicated, copies of the above specifications, standards, and handbooks a
13、re available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094, or at http:/assist.daps.dla.mil/online/start/). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62550E(AT) 2.2.2 Other
14、Government documents, drawings, and publications. The 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 ARMY 11669705 - Box Assy, Control (
15、Interface). 12268109 - Box Assembly, Accessory Control (Interface). 12330264 - Control Box, Electrical, Heat-Ventilator (Interface). 12345539 - Drivers Master Panel Assembly (Interface). 12474864 - Heater, Vehicular Compartment PURCHASE DESCRIPTIONS ATPD 2165 - Heater Test Stand, Valcom model VHTS-8
16、9102. (Copies of these drawings are available from the U.S. Army Tank-automotive and Armaments Command, Warren, MI 48397-5000, or at standardizationtacom.army.mil). NUCLEAR REGULATORY COMMISSION (NRC) Code of Federal Regulations (CFR) - Title 10, Part 40. (Copies of the Code of Federal Regulations (
17、CFR) are available from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402, or at www.nrc.gov). DEPARTMENT OF TRANSPORTATION (DoT) Code of Federal Regulations (CFR) - Title 49, Part 393. (Copies of the Code of Federal Regulations (CFR) are available from the Super
18、intendent of Documents, U.S. Government Printing Office, Washington, DC 20402, or at www.dot.gov). 2.3 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 t
19、hose listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) Performance Test Code - Application Part
20、 II of Fluid Meters Sixth (PTC) 19.5 Edition 1971 (Interim Supplement 19.5 on Instruments and Apparatus) (DoD Adopted). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62550E(AT) (Application for copies should be addressed to the American S
21、ociety of Mechanical Engineers, 345 E. 47th Street, New York, NY 10017, or at www.asme.org). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B117 - Standard Practice for Operating Salt Spray (Fog) Apparatus (DoD Adopted). ASTM D975 - Standard Specification for Diesel Fuel Oils (DoD Adopted).
22、ASTM D1655 - Standard Specification for Aviation Turbine Fuels (DoD Adopted). ASTM D2156 - Standard Test Method for Smoke Density in Flue Gases from Burning Distillate Fuels (DoD Adopted). (Application for copies should be addressed to American Society for Testing and Materials, 100 Barr Harbor Driv
23、e, West Conshohocken, PA 19428-2959, or at www.astm.org). AIR MOVEMENT AND CONTROL ASSOCIATION (AMCA) AMCA 210 - Laboratory Methods of Testing Fans for Rating (DoD Adopted). (Application for copies should be addressed to the Air Movement and Control Association, 30 W. University Drive, Arlington Hei
24、ghts, IL 60004, or at www.amca.org). SOCIETY OF AUTOMOTIVE ENGINEERS, INC. (SAE) SAE J726 - Air Cleaner Test Code, Recommended Practice (DoD Adopted). (Application for copies should be addressed to Society of Automotive Engineers, Inc., 400 Commonwealth Drive, Warrendale, PA 15096, or at www.sae.org
25、). (Non-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.) 2.4 Order of precedence. In the event of a conflict between the
26、text of this specification and the references cited herein (except for related associated performance specification sheets), the text of this document takes precedence. Nothing in this document however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 4 Provi
27、ded by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62550E(AT) 3. REQUIREMENTS 3.1 First article. When specified (see 6.2.d), a sample shall be subjected to first article inspection (see 4.3). 3.2 Design and construction. The heater shall meet the phy
28、sical (see 3.3), environmental (see 3.4), performance (see 3.5), and reliability/durability (see 3.6), requirements as specified herein. The heater shall be constructed to the form and dimension depicted on the applicable performance specification sheet (see 6.2) and shall be compatible with control
29、 box 11669705, 12268109, 12330264, panel assembly 12345539 and test stand ATPD 2165 (see 4.7.1). 3.3 Physical. 3.3.1 Weight. Class I heaters shall not weigh more than 9.5 kilograms (kg) 21 pounds (lb). Class II heaters shall not weigh more than 18 kg (40 lbs) (see 4.7.3). 3.3.2 Materials. Heaters sh
30、all be in accordance with the manufacturers materials specifications for heaters, and shall meet the requirements specified herein (see 4.7.1). 3.3.2.1 Dissimilar metals. Except where necessary to complete an electrical circuit, dissimilar metals shall not be electro-chemically incompatible (see 4.7
31、.1). 3.3.2.2 Hazardous materials. Asbestos, cadmium, and radioactive material will not be used in this item. Radioactive material is defined by a) Title 10, Code of Federal Regulations, Part 40, and b) Other radioactive material in which the radioactivity is greater than 0.002 microcuries per gram o
32、r 0.01 microcuries total activity for the item (see 4.7.1). 3.3.2.3 Electrical components and wiring. The wire and insulation shall be flexible to -54 degrees Celsius (C) -65 degrees Fahrenheit (F). Each wire end or connector shall be uniquely and permanently marked. Marking the ignitor leads is opt
33、ional if they are readily identifiable (see 4.7.1). 3.3.2.4 Brush inspection. All brush-type electric motors shall have provisions for brush inspection or indication of brush wear without disassembly (see 4.7.1). 3.3.2.5 Recycled, recovered, or environmentally preferable materials. Recycled, recover
34、ed, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3.3 Interchangeability. MIL-PRF-62550/2 heaters shall be easi
35、ly convertible to MIL-PRF-62550/1 through the use of screw drivers, hex keys or hex sockets. The conversion of heaters shall not remove any protective or sensing devices needed to fulfill requirements specified herein. After conversion, dimensional and functional conformance to MIL-PRF-62550/1 shall
36、 be verified (see 4.7.1 and 4.7.4). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62550E(AT) 3.3.4 Welding. All heater welds that are exposed to combustion gases during normal operation shall be readily weldable for highly stressed joints
37、. Welding procedure shall be in accordance with the best commercial standards (see 4.7.1). 3.3.5 Combustion air inlet strength. Type II only. The heaters combustion air inlet shall be capable of sustaining at least 50 kg (110 lb) load without permanent bending, cracking, interference between moving
38、parts, or any damage that would affect heater performance or durability. Combustion air inlet adapter rotating torque increase shall be less than 20 percent (%) at the end of the test (see 4.7.5). 3.3.6 Safety. Surface areas of the heater outside of designated hot spots shall not cause contact burns
39、. Heaters shall comply with all DoT requirements contained in 49CFR 393.77 “Heaters”. The heater shall not make more noise than 85 decibels dB(A), and shall also not increase the overall noise level in the crew compartment (see 4.7.1 and 4.7.6). 3.3.7 Protective coating. The heater shall be coated w
40、ith dull olive or forest green paint that will not be damaged by handling or exposure to environmental testing (see 4.7.2 and 4.7.7). 3.3.8 Identification and marking. Nameplate marking shall withstand decontaminating agents (see 3.3.7) and the specified environmental tests (see 3.4). After environm
41、ental tests information shall be readily legible from 91.5 centimeters (cm) (3 feet) by a person with 20-20 vision. Identification marking shall include, as a minimum, the following information permanently marked on the exterior of the heater (see 4.7.1 and 4.7.2). a. Design activity CAGE and Part o
42、r Identifying Number (PIN). b. Manufacturers name, CAGE, and model number. c. Contract number. d. Nomenclature: Heater, Vehicle Compartment, Fuel-Fired, 17.6 kilovolts (kV) (60 000 Btu/hr) or 8.8 kW (30 000 Btu/hr), as applicable. e. National stock number. f. Serial number. g. Type II (only) heaters
43、. Combustion air inlet adapter shall be marked as follows with letters at least 1.25 cm (0.5 inch (in.) high by dull black paint: “DO NOT REMOVE”. 3.4 Environmental conditions. The heater shall meet the performance requirements of 3.5 and retain its maintainability after being subjected to the envir
44、onmental conditions specified in 3.4.1 through 3.4.7 (see 4.7.7). 3.4.1 Temperature. 3.4.1.1 High temperature. Storage at a temperature of at least 82C (180F) and operation with combustion air temperature of at least 50C (120F) (see 4.7.8.1). 3.4.1.2 Low temperature. Storage at -54C (-65F) and opera
45、tion down to -50C (-55F) (see 4.7.8.2). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-62550E(AT) 3.4.2 Humidity. Exposure to temperature and humidity cycles (see 4.7.9). 3.4.3 Salt fog. Exposure to salt fog for 96 hours (see 4.7.10). 3.4.
46、4 Shock. Exposure to 40 gravity units (g) shock loading for 18 milliseconds 3 milliseconds. (see 4.7.11). 3.4.5 Vibration. Exposure to sinusoidal vibration in accordance with figure 1, including up to four resonance dwells (see 4.7.12). 3.4.6 Electromagnetic interference (EMI). Operate the heater as
47、 specified (see 3.5.7 and 3.5.1.1). For all operating modes (including start cycle) it shall not emit signals on the control boxs power lead greater than shown by figures 3a and 3b or radiate signals greater than shown by figures 4 and 5. Also it shall not be damaged or malfunction when exposed to i
48、nterfering signals shown by table I (radiated) and figure 6 (control boxs power lead) (see 4.7.13). 3.4.7 Dust. Exposure for at least 200 hours with at least 3 grams per cubic meter (g/m3) of fine dust per SAE J726 in the combustion air (see 4.7.14). TABLE I. Radiated interference. Frequency Range M
49、inimum Limit Level (Volts/Meter) 10 kHz to 2 MHz 10 2 MHz to 30 MHz 20 30 MHz to 2 GHz 50 2 GHz to 12.4 GHz 10 NOTE: Above 30 MHz expose the heater to both vertically and horizontally polarized signals. 3.5 Performance. The heater shall meet the performance requirements specified herein when mounted in any position from horizontal to vertical with the air inlet level with, or
