1、9999906 20423bb 357 I INCH-POUND I MILPRF-623 15C 25 July 1997 SUPERSEDING 3 December 1990 MIL-H-623 1 SB(AT) PERFORMANCE SPECIFICATION HEATER ASSEMBLY, COMBUSTION VEHICULAR COMPARTMENT, 60 O00 BTU/H This specification is approved for use by all Departments and Agencies of the Department of Defense.
2、 1. SCOPE 1.1 Scope. This specification establishes the performance, design, testing, rnandacturing, and acceptance requirements for a forced air inlet personnel heater assembly, referred to herein as “heater” (see 6.1). 1.2 Classification. Heaters will be dual or single air of the following types (
3、see 6.4.1 and 6.4.2): Type I Type II - Extended operating range. - Standard operating range. 2. APPLICABLE 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 spec
4、ification or recommended for additional information or as examples. While every effort has been made 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
5、listed. 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: AMSTA-TR-EBLUE, Warren, MI 48397-5000, by using the Standardization Document Improv
6、ement Proposal (DD Form 1426) appearing at the end of this document, or by letter. AMSC NIA FSC 2540 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling Services 9999906 2092367 293 l MIL-PKF-623 15C 2.2 Government documents. 2.2.1 Speci
7、fications. standards, and handbooks. The following specifications, 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 St
8、andards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDEW A-A-50271 A-A-52557 - Plate, Identification, Instruction and Marking, Blank. - Fuel Oil, Diesel; For Posts, Camps And Stations. STANDARDS DEPARTMENT OF DEFENSE MIL-STD-462 - Electromagnetic Interferenc
9、e Characteristics, Measurement of. MIL-STD-8 10 - Environmental Test Methods. (Uness otherwise indicated, copies of the above specifications, standards, and handbooks are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 11-5094.) 2.2.2 Oth
10、er Government documents. drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specii6ied herein. Unless otherwise specified, the issues are those cited in the solicitation. DEPARTMENT OF TRANSPORTATION Federal Mot
11、or Vehicle Safety Standards (FMVSS) Federal Motor Carrier Safety Requirements (FMCSR) (Copies of the Department of Transportation documents are available fiom the U.S. Govemment Printing Office, Superintendent of Documents, Washington, DC 20402-9328.) 2 Licensed by Information Handling ServicesMIL-P
12、RF-623 15C NUCLEAR REGULATORY COMMISSION (NRC) Code of Federal Regulations (CFR) - Title 10, Parts 30 and 40. (Copies of the Code of Federal Regulations (CFR) are available from the Superintendent of Documents, U. S. Government Printing Office, Washington, DC 20402.) DRAWINGS 1 1669489 1 1669490 - H
13、eater, Vehicular Compartment (Interface). - Heater, Vehicular Compartment (Interface). (Copies of these drawings are available from the U.S. Army Tank-automotive and Armaments Command, ATTN: AMSTA-TR-ElBLUE, Warren, MI 48397-5000.) 2.3 Non-Government publications. The following documents form a part
14、 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 otherwise specified, the issues of documents not listed in the DoDISS are the issues of the do
15、cuments cited in the solicitation (see 6.2). AMERTCAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSUASQC 21.4 - Sampling Procedures and Tables for Inspection by Attributes OD Adopted). (Application for copies may be obtained from the American National Standards Institute, 11 West 42nd Street, New York, Ny
16、 10036.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B633 ASTM D2156 - Standard Specification for Electrodeposited Coatings - Smoke Density in Flue Gases from Burning Distillate of Zinc on Iron and Steel. Fuels, Test for. (Application for copies of ASTM publications may be obtained from t
17、he American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) AMERICAN WELDING SOCIETY (AWS) AWSB2.1 - Standard for Welding Procedure and Performance Qualification (Replaces AWS D 1 O. 9). 3 Licensed by Information Handling ServicesW 999990b 20q23b9 Obb = M
18、IL-PW-623 15C (Application for copies may be obtained from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33 126.) 2.4 Order of Drecedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothin
19、g 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 subjected to first article inspection in accordance with 4.3. 3.2 Materials. Materials shall be in acc
20、ordance with the manufacturers material specifications for heaters. Materials shall be corrosion resistant or treated to prevent corrosion. The materials shall be capable of meeting all of the operational and environmental requirements specified herein (see 4.5.1). Recycled materials is acceptable w
21、hen processed to make new. 3.2.1 Dissimilar metals. Except where necessary to complete an electrical circuit, the use of dissimilar metals in metal to metal contact shall be avoided (see 4.5.1). 3 2.2 Steel components. Non-painted steel components, other than stainless steel, shall be zinc plated ac
22、cording to ASTM B633, type II class Fe/Zn 13 or equivalent. Heat radiating surfaces may be aluminized steel (see 4.5.1). 3.2.3 Aluminum components. Aluminum components shall be protected by chemical conversion coating which shall provide the components with the maximum corrosion resitance as weil as
23、 optimum paint adhesion (see 4.5.1). 3.2.4 Identification plates. Nameplates shall be furnished in one of the configurations as specified below (see 4.5.1): a. Material and construction shall conform to A-A-50271. Nameplate shall be permanently attached with metal fasteners. b. Adhesive backed alumi
24、num foil, except backing sheet, which may be made of paper, shall be removable intact by stripping without use of water or other solvents. Plates shall have an average adhesion, over bare and painted metal surfaces, of not less than 50 ounces per inch (Odin.) of width at 77 and, except as otherwise
25、specified, when operating in both the high and low heat modes. The heater shall perform as specified using fuel conforming to A-A-52557, grades 1-D and 2-D and arctic grade (JI?-8) aviation fuel (see 6.5). 3.4.1 M. 3.4.1.1 Fuel consumption. With any fuel pressure between 3 and 15 pounds per square i
26、nch (psig) at the fuel valve inlet, fuel consumption shall not exceed the following (see 4.5.4.1): High heat Low heat 0.092 pounds per minute (lb/min) 0.052 lb/min 3.4.1.2 Fuel leakace. There shall be no visible leakage fiom the heater fuel components when 15 psig fuel pressure is applied to the inl
27、et and the heater is not operating (see 4.5.4.2). 8 Licensed by Information Handling Services9999906 2042374 423 P MIL-PRF-623 15C 3.4.2 Voltage. The heater shall start and except where otherwise specified, meet performance requirements with an applied voltage of 19 to 30 volts (V) direct current (d
28、c) (see 4.5.5). 3.4.3 Current. At 24 Vdc, the current draw fiom the power source shall not exceed 16 amperes (A) starting and 15 A running when the fuel preheaters are not activated. Current draws may increase by 5 A when the fuel preheaters or start circuit are activated at approximately 45OF (see
29、4.5.6). 3.4.4 Heat output. With a ventilating back pressure of 1.30 inch (in.) of water and an exhaust pressure of 0.95 (type I) or 0.85 (type II) in. of water set as specified (see 3.43, the heater output shall be as follows (see 4.5.7): High heat Low heat 19 to 30 Vdc, 60 O00 British thermal units
30、 per hour tU/hr) +IO percent. 19 to 30 Vdc, 30 O00 BWhr 220 percent. 3.4.5 Air discharge rate. With 24 Vdc applied, the ventilating air discharge rate, based on a standard air density of 0.075 pounds per cubic foot (ib/fi3) at 29.92 in. of mercury (Hg), 70F, into the specified restriction shall be a
31、s follows (see 4.5.8): Back pressure Exhaust Discharge rate Minimum (inches of (inches of Minimum water) ventilation water) (standard ff/min scfin) Type I 1.30 0.95 165 Type II 0.00 0.00 200 1.30 0.85 150 3.4.6 Overheat switch. When subjected to the specified test, the heater shall meet the requirem
32、ents for the applicable type (see 4.5.9): a. Type I. The heater shall be equipped with an overheat switch to reduce the fuel flow to control the temperature of the discharge air so that it fds between 275 and 35O0F. When the air restriction is removed the heater shall continue burning without requir
33、ing a return to the start cycle. Upon further restriction of air flow to not greater than 75 scfn the ventilating air temperature shall not raise above 475OF and the heater shall shut off its fuel flow then enter its purge cycle and shut itself OE 9 Licensed by Information Handling Services70b 20423
34、75 3bT = MIL-PRF-623 15C b. Type II. The heater shall be equipped with an overheat switch and an automatic fel shut off device which will automatically open a circuit and shut off the fuel flow when the temperature of the discharge air reaches 400F. Subsequently, it shall enter its purge cycle and t
35、hen shut itself OE 3.4.7 Smoke densitv. After the heater has been operating on high heat for 5 minutes, the exhaust gases shall not exceed a smoke spot number of three below 55F and five above 55F as defined in ASTM D2156 (see 4.5.10). 3.4.8 Starting; time. The starting thne, measured fi-om the time
36、 the heater is turned on until the igniter circuit is de-energized shall not exceed the following for the specified types (see 4.5.11): Type I Type II - Two minutes for temperatures above -20F. Four minutes for - Four minutes at all temperatures. temperatures below -20F. 3.4.9 Purg;ing; time. The pu
37、rging time for both type I and II, measured fi-om the time the heater switch is turned off until the blowers shut off at which time the exhaust temperature shall not be greater than 350F, shall not exceed 4 minutes (see 4.5.12). 3.4.10 Toxic fumes. The heater shall be designed so that the combustion
38、 products do not contaminate the ventilating air during operation of the heater (see 4.5.13). 3.4.1 1 Endurance. The heater shall meet the requirements of 3.4.1, 3.4.2 through 3.4.7 and 3.4.10 after 800 hours of operation, and 3.4.1.2, 3.4.8 and 3.4.9 during 800 hours of operation; including at leas
39、t 2400 start cycles. The following maintenance is permissible (see 4.5.14): a. Ice may be removed from the heater fuel system. b. Cleaning and adjustment of the flame detector switch, but not more than two times. c. Replacement of the igniter, but not more than one time. d. Replacement of the burner
40、 assembly if required, but no more than frequently than once per sample during the test procedure. 3.4.12 Environmental conditions. The heater shall meet the requirements of 3.4.1 through 3.4.10 ;i; _. _. i.y _. _. - rm ; ._ . - - _. - _. - _. .- _. _. _. _. - ._ ;%; - - _. - _. * - - _. - - - I -I
41、-i -1 70 60 ._ :;: j ;i . - _. - . T _. - - - - . - - - z .-. - _. _. _. _. _. . - -._. - _. _. - - _._. _. - + iLy - - * + - - * + * * - -c - - .- - - 8 * . * - * s + * - - - - . . -. . -. . . . -. . T . 50 FIGURE 5. I I 40 30 dBpA . . . . . . . . . . 20 + IO + O Power lead electromagnetic emission
42、 limits. I O0 IO Fri o .I 0.01 24 Licensed by Information Handling Servicesb m 99999Ob 2042390 bib m MIL-PFW-623 1 5 C dBpVIm 70 60 50 40 30 20 10 O 0.01 o. I I io I00 1000 IO O00 Freqency (M&) FIGURE 6. Field emission limits. custodian: Army - AT Review Activity: DLA - CS Preparing Activiy: Army - AT (Project 2540-0438) 25 Licensed by Information Handling Services
