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 i
2、nformation 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 4520 INCH-POUND MIL-PRF-22594C(SH) 31 January 2012 SUPERSEDING MIL-PRF-22594B(SH) 6 December 2004 PERFORMANCE SPECIFICATION HEATERS, DUC
3、T TYPE, ELECTRIC 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 electric, duct type heaters used in heating, ventilat
4、ing, and air conditioning systems. 1.2 Classification. Electric, duct type heaters are of the following sizes and types as specified in table I (see 6.2). 1.2.1 Sizes. The sizes of electric, duct type heaters are as follows: 19EH - 3- by 6-inch housing 29EH - 12- by 30-inch housing 20EH - 3- by 6-in
5、ch housing 30EH - 15- by 30-inch housing 21EH - 3- by 6-inch housing 31EH - 12- by 42-inch housing 22EH - 3- by 9-inch housing 32EH - 18- by 30-inch housing 23EH - 3- by 14-inch housing 33EH - 16- by 42-inch housing 24EH - 6- by 9-inch housing 34EH - 15- by 56-inch housing 25EH - 6- by 14-inch housi
6、ng 35EH - 24- by 42-inch housing 26EH - 6- by 22-inch housing 36EH - 21- by 56-inch housing 27EH - 9- by 22-inch housing 37EH - 36- by 42-inch housing 28EH - 9- by 30-inch housing 38EH - 33- by 56-inch housing 1.2.2 Types. The types of electric, duct type heaters are as follows: Type L - Low Heat Ou
7、tput Type M - Medium Heat Output Type H - High Heat Output Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-22594C(SH) 2 1.3 Part or identifying number (PIN). PINs to be used for electric, duct type heaters acquired to this specification are c
8、reated as follows: M 22594 - XX X Prefix for Military Specification Specification Number Size (see code below) Type (see code below) Size Code Type Code Size Code Type Code 19EH 19 L L 20EH 20 M M 21EH 21 H H 22EH 22 23EH 23 24EH 24 25EH 25 26EH 26 27EH 27 28EH 28 29EH 29 30EH 30 31EH 31 32EH 32 33E
9、H 33 34EH 34 35EH 35 36EH 36 37EH 37 38EH 38 Examples: M22594-19H M22594-26L Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-22594C(SH) 3 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4
10、, 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 ensure the completeness of this list, document users are cautioned that they must meet all
11、 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 specifications, standards, and handbooks form a part of this document to the extent specifi
12、ed 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 Machinery, Equipment, and Systems, Requirements for DEPARTMENT OF DEFENSE STANDARDS MIL-STD
13、-108 - Definitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I Environmental and Type II Internally Excited) MIL-STD-889 - Dissimilar Metals MIL-STD-1399-300 - Electric Power, Alternating Current
14、(Metric) MIL-STD-2142 - Magnetic Silencing Characteristics, Measurement of (Metric) (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or https:/assist.daps.dla.mil.) 2.2.2 Other Government documents, drawings, and publications. The following other Government
15、documents, drawings, 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 Fabric
16、ation Welding and Inspection, 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:/nll1.ahf.nmci.navy.mil/.) 2.3 Non-Government publicatio
17、ns. The following documents 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. AMERICAN SOCIETY OF HEATING, REFRIGERATION, AND AIR CONDITIONING ENGINEERS (ASHRAE) ASHRAE STD 33 - Meth
18、ods of Testing Forced Circulation Air Cooling and Air Heating Coils (Copies of this document are available from the American Society of Heating, Refrigeration, and Air Conditioning Engineers, 1791 Tullie Circle, NE, Atlanta, GA 30329 or online at www.ashrae.org.) Provided by IHSNot for ResaleNo repr
19、oduction or networking permitted without license from IHS-,-,-MIL-PRF-22594C(SH) 4 AMERICAN WELDING SOCIETY (AWS) AWS B2.1/B2.1M - Specification for Welding Procedure and Performance Qualifications AWS B2.2/B2.2M - Standard for Brazing Procedure and Performance Qualification (Copies of these documen
20、ts are available from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33216 or online at www.aws.org.) ASTM INTERNATIONAL ASTM F1166 - Standard Practice for Human Engineering Design for Marine Systems, Equipment, and Facilities (Copies of this document are available from ASTM Internat
21、ional, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959 or online at www.astm.org.) 2.4 Order of precedence. 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, howev
22、er, 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 4.2. 3.2 Materials. Materials shall be corrosion-resisting. Materials
23、degraded during the fabrication process shall be normalized to restore those properties before assembly in any heater. Selected materials shall be capable of meeting all of the operational and environmental requirements specified herein. 3.2.1 Hazardous materials. Materials for use in the constructi
24、on of heaters shall have no effect on the health of 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. 3.2.2 Fasteners. Material for all bol
25、ts, nuts, studs, screws, and similar fasteners shall be corrosion-resistant passivated or of a material rendered resistant to corrosion. Self-tapping sheet metal screws shall not be used. Galling shall be prevented. Tapped holes shall be reinforced where shearing of thread can occur. 3.2.3 Dissimila
26、r metals. Heaters and components shall not be degraded by electrolysis as specified in MIL-STD-889. 3.2.4 Nonmagnetic material. When nonmagnetic heater assemblies are specified (see 6.2), parts shall be fabricated of nonmagnetic material which has a relative permeability of less than 2.0 after fabri
27、cation. 3.2.5 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, 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
28、advantageous life cycle costs. 3.3 Painting. Interior and exterior surfaces of the heater, except the heating elements and those surfaces constructed of brass, copper, or corrosion-resisting steel, shall be painted as specified (see 6.2). If not specified, the heater shall be unpainted. 3.4 Welding
29、and allied processes. Welding and allied processes shall be performed by personnel certified to AWS B2.1/B2.1M and AWS B2.2/B2.2M. S9074-AR-GIB-010/278 shall be used for guidance. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-22594C(SH) 5 3
30、.5 Identification plates. Each heater shall be provided with a permanently attached corrosion-resistant identification plate. Attachment method for the identification plate shall also be corrosion-resistant. The plate shall contain the following information: a. National stock number (NSN) b. Manufac
31、turers name, commercial and government entity (CAGE) code, and part number c. PIN code d. Contract or order number 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,
32、 and strength. 3.7 Operating life. The heater shall have an operating life of at least 126,000 hours. The basis for design of replaceable parts shall be an equivalent of 5 years of ship operation (approximately 21,000 hours) before replacement is necessary (see 3.11.8). 3.8 Workmanship. The heater a
33、ssembly shall be free from defects that affect appearance and operation. Fin edges of the heating elements shall be free of burrs and shall not be bent. Support sheets shall not crack due to punching or forming. Sharp edges, burrs, and other imperfections shall be removed from all parts subject to c
34、ontact with personnel to prevent cuts during repair and maintenance. Cabinet corners shall be square and fasteners shall be in place and secured. 3.9 Human engineering. The heater shall be arranged so as to achieve safe, reliable, and effective performance by the operator and maintenance personnel a
35、nd to optimize personnel skill requirements. ASTM F1166 shall be utilized as a guideline in applying human engineering design criteria for the heater assembly. 3.10 Maintainability. The heater assembly shall be constructed so that the capability to maintain, disassemble, and repair the unit may be d
36、emonstrated (see 4.5.7). 3.11 General design. The heater shall consist of three or more electrical elements (see 3.11.8). Standard wiring shall be for single-stage operations with terminals marked for acceptance of shipboard cable. Up to four three-phase stages may be provided by the contractor usin
37、g the configuration of the standard single-stage heater. The terminals and shipboard wiring shall be mounted and enclosed in a metal housing. This housing shall be provided with a spraytight enclosure on one side for the electrical connection and a manual reset high limit cutout switch. The heater s
38、hall be designed for overhead mounting and shall be provided with flanges on both the inlet and outlet sides for connection to ductwork and shall be ready for installation and connection to a power source. 3.11.1 General shipboard design conditions. General shipboard design characteristics shall be
39、as follows: a. Power source: In accordance with MIL-STD-1399-300: (1) 440 volts, three-phase, 60-Hertz for Size 22EH, Types M and H, and Sizes 23EH through 38EH. (2) 115 volts, three-phase, 60-Hertz for Sizes l9EH through 21EH and Size 22EH, Type L. b. Shall operate in accordance with requirements h
40、erein under a design entering dry bulb (DB) temperatures of 0 F minimum to 70 F maximum. c. Shall operate satisfactorily at airflows between 80 to 125 percent of rated airflow (see table I). d. Where “standard air” conditions are referenced herein, they shall be defined as: dry air having a density
41、of 0.075 pounds per cubic foot, which corresponds to a temperature of approximately 69.4 F dry bulb at a pressure of 14.696 pounds per square inch absolute. 3.11.2 Sizes. Sizes and types of heaters shall be limited to those specified (see 1.2). 3.11.3 Physical dimensions. To satisfy interface requir
42、ements and permit replacement, physical dimensions of the heater shall be in accordance with the dimensions provided on figure . 1Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-22594C(SH) 6 3.11.4 Heater casing material. The casing shall be
43、manufactured from corrosion-resisting materials and be equal or greater in yield strength (tensile and compressive) to 0.045-inch thick 304 stainless steel when the heater face area is 0.750 square feet or less and shall be equal or greater in yield strength (tensile and compressive) to 0.056-inch t
44、hick 304 stainless steel when the heater face area exceeds 0.750 square feet. Casing shall be of watertight construction. 3.11.5 Enclosure for electrical connections. The enclosure for electrical connections shall be on the side of the heater casing and shall be of spraytight construction, except th
45、e enclosure where the heating elements enter, which shall be watertight as specified in MIL-STD-108. Provisions shall be made for the drainage of condensed moisture. A removable cover plate shall be provided to permit access to the electrical connections, parts, and mounting of heating elements. A s
46、eparate removable cover plate shall be provided in the bottom of the enclosure to permit installation of a cable terminal tube by the installing activity. Surfaces which mate with the removable cover plates shall be gasketed or otherwise made suitable to provide a spraytight seal. 3.11.6 Connections
47、 (flanges) for ductwork and mounting flanges. To permit replacement, connecting flanges for ductwork shall be provided with 13/32-inch diameter holes (or optional 38-inch 16 UNC 2B threaded holes), as shown on figure , and shall be on 3-inch centers, working from the flange corners towards the air i
48、nlet and air outlet center lines. When the space between the centerline and the adjacent hole exceeds 2 inches, there shall be a hole on the centerline. Tolerance for the distance between hole centers and the location of the corner holes shall be 1/64inch. Mounting flanges shall be provided with -in
49、ch diameter holes (or optional -inch 13 UNC 2B threaded holes), as shown on 1figure . Optional mounting flange center connections are shown for Size 33EH heaters and larger; these locations are given if additional mounting connections are required to pass shock testing. 13.11.7 Intermediate supports. Spacing of intermediate supports, where required, shall not exceed 23 inches between supports. 3.1
