1、I NOT MEASUREMENT I I SENSITIVE I A-A- 50548 June 9, 1995 SUPERSEDING 23 August 1990 MIL-F-16716E COMMERCIAL ITEM DESCRIPTION FANS, CENTRIFUGAL, INDUSTRIAL The General Services Administration has authorized the use of this Commercial Item Description for all federal agencies. 1. SCOPE. This specific
2、ation covers electric-motor-driven centrifugal fans which are designed for ventilating uses and industrial air-handling applications. 2. CLASSIFICATION. The fans are of the following types, as specified (see 7.2). Type I - Forward-curved blades. Type II - Radial blades. Type III - Backward-inclined
3、blades. 3. SALIENT CHARACTERISTICS. 3.1 DescriPtion. The unit shall consist of a centrifugal fan, electric motor, guards, and accessories. All components shall be attached to a common base which shall include provisions for fastening it to a foundation. The unit shall be completely assembled, ready
4、for installation, 3.2 Standards compliance. Fans shall be capacity rated in accordance with AMCA 210 and sound rated in accordance with AMCA 300, prior to approval of the first article, if one is specified, or prior to approval of the first shipment, if a first article is not specified. The supplier
5、 shall submit to the contracting officer satisfactory evidence that the fan he proposes to furnish has been rated in accordance with AMCA 210 and AMCA 300. IBeneficial comments, recommendations, additions, deletions, clarifications, I letc. and any pertinent data which may be of use in improving thi
6、s document I Ishould be addressed to: Commanding Officer (Code 156), Naval Construction I IBattalion Center, 1000 23rd Avenue, Port Hueneme, CA 93043-4301, by using I Ithe Standardization Document Improvement Proposal (DD Form 1426) appearing at Ithe end of this document or bv letter. I AMSC N/A FSC
7、 4140 DISTRIBUTION STATEMENT A. Approved for public release, distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-50548 D 9999974 OLb89L8 T72 4 + A-A- 50548 3.3 Desien. The fan assembly shall be designed to handle clean or d
8、ust-laden air at temperatures up to 250 degrees Fahrenheit (OF) (121 degrees Celsius (OC), and up to 600F (316OC) when equipped with a bearing cooling device (see 3.6.3.1). The design of the equipment and accessories shall permit accessibility for maintenance and service in the field. The design sha
9、ll be such as to prevent conditions hazardous to personnel or deleterious to equipment. The fan assembly shall be built in accordance with AMCA 99. 3.4 Safety. All parts which are energized electrically shall be insulated, fully enclosed, or guarded when such parts are exposed to contact by personne
10、l or otherwise create a hazard. All moving parts hazardous to personnel shall be enclosed or guarded. Nonfunctional sharp edges, projecting points, and excessive length of fastening devices shall be avoided. Protective devices shall be mounted on or near components containing hidden hazards. portion
11、s of OSHA Title 29, CFR, Part 1910.219 shall apply. Applicable 3.5 Performance. The fan shall deliver its rated capacity in cubic feet per minute at the static pressure in inches of water specified (see 7.2) with tolerances set forth in AMCA 210. Fan sound power level shall not exceed 90 decibels, A
12、-weighted scale, continuous or intermittent, at five feet from the equipment. 3.6 Details of components. The unit shall consist of the components specified below; and when the motor is connected to the matching power source, the unit shall function in accordance with the performance requirements. 3.
13、6.1 Fan wheel. Unless otherwise specified (see 7.2), the fan wheel shall be constructed of cast aluminum alloy or carbon steel plate, as specified (see 7.2). Each steel blade shall be riveted or welded to form the fan wheel. 3.6.2 Fan shaft, Unless otherwise specified (see 7.2), the shaft shall be t
14、urned, ground, and polished carbon steel alloy. The maximum allowable turnout after all machining shall be 0.001 inch (0.0254 millimeters (nun) on shafts with diameter less than or equal to 1.5 inches (38.1 nun) in diameter and 0.002 inches (0.05 mm) on shafts greater than 1.5 inches (38.1 nun) in d
15、iameter. The shaft shall be sized for maximum speed of the size of fan involved and shall operate at not more than 80 percent of the first critical speed. 3.6.3 Fan bearings. Unless otherwise specified (see 7.2), the fan shall be equipped with precision anti-friction bearings with an average life of
16、 B-10. The bearings shall be of the self-alining type and shall be mounted in suitable pillow blocks having provision for attachment to the fan housing or base assembly. 3.6.3.1 Bearing cooling device. When specified (see 7.2), a bearing cooling fan of suitable size, of split design, or a heat sling
17、er shall be provided with anti-friction bearing when the air temperature in the fan is greater than 250F (121OC) but less than 600F (316OC). 3.6.4 Fan housing. sheet and of a nominal thickness not less than that listed in table I. The scroll and side plate joints shall be made airtight. The housing
18、shall be reinforced to minimize vibration. When specified (see 7.2). the discharge direction for types I and III larger than 33 inches in fan diameter, and type II The housing shall be constructed of carbon steel plate or 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without
19、 license from IHS-,-,- _ A-A-50548 A-A-50548 9999974 OLb89L 909 larger than 57 inches (1448 mm) in fan diameter shall be easily converted at angles of 45 degrees. When specified (see 7.2), a threaded drain connection to accommodate a 1 inch (25.4 mm) or 3/4-inch (19.1 mm) diameter standard pipe, as
20、specified (see 7.2). Standard pipe shall be located at the lowest point in the scroll. When specified (see 7.2), a flush type access door shall be installed on the fan scroll and held by quick-release clamps on type II fans. Inlet and outlet duct connections shall be flanged. TABLE I. Housine eaees.
21、 Nominal fan diameter I I (inches) I Sides and Scroll I I I I 16 gage I I I I 16 (406 mm) up to 24 (610 mm) I 14 gage I I 24 (610 mm) up to 72 (1829 mm) I 12 gage I I 72 (1829 mm) up to 132 (3353 mm)I 10 gage I I 12 (305 mm) up to 16 (406 mm) I 3.6.5 Motor. The motor shall conform to NEMA MG 1, and
22、shall be capable of continuous operation when driving the fan at rated conditions, and may be single or multi-speed, unless one of these is definitely specified (see 7.2). Features of bearings, enclosure, and electrical characteristics shall be as specified (see 7.2). When specified (see 7.2), an ac
23、ross-the-line part-wind wye-delta or autotransformer shall be supplied. When specified (see 7.2), the motor shall be open drip proof, totally enclosed, or explosion proof. 3.6.5.1 Direct drive. When a direct drive is specified (see 7.2), the fan wheel shall be mounted on the motor shaft or driven th
24、rough a suitable coupling by the motor. The motor shall be aligned to minimize drive line vibration. When specified (see 7.2), the assembly shall be mounted on resilient vibration isolators. 3.6.5.2 V-belt drive. V-belts. the motor horsepower rating corrected to the service and arc-of-contact factor
25、s. For the motor location specified, a standard belt length shall be used to the nearest, but not less than the recommended, motor and fan shaft center distance. Sheave pitch diameters shall be as specified by the manufacturer for the speed ratio and fan speed required. When specified (see 7.2), she
26、aves shall be of a variable pitch type. which shall provide for belt tension adjustment and for anchorage to the fan foundation. All exposed belt-driven fans shall have safety guards that conform to ANSI B15.1 and adjustable motor mounts for belt tension adjustment and belt replacement. V-belts shal
27、l conform to ZZ-B-225. Sheaves shall conform to NEMA MG 1 for minimum electric motor sheave diameter for a given horsepower motor. Motor sheaves shall be of the adjustable pitch type which provides a 20 percent speed variation, selected so that the Specified capacity will be delivered with sheaves a
28、t approximately mid-position. V-belt drives shall be selected for continuous duty in accordance with RMA Engineering Standards for Multiple V-Belt Drives with a service factor of 1.5. The fan shall be driven by means of single or multiple Quantity and cross-sectional size of the belts shall be deter
29、mined by The motor shall be solidly mounted to a suitable base 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-505 48 9999974 0368920 620 = u A-A- 50548 3.6.5.3 Motor starter. The starter control shall be manual or magnetic as specified (see 7
30、.2), applicable NEMA type with thermal overload protection of the size and capacity suitable for the required service outlined in NEMA ICs 1 and NEMA ICs 2. The control enclosure shall be as required by NEMA ICs 6 and shall be as specified (see 7.2). 3.7 Guards. 3.7.1 Inlet guard. Unless otherwise s
31、pecified (see 7.2), the type I and type III fans shall be provided with an air-inlet screen guard of heavy gage galvanized wire. The meshes of the screen guard shall not be greater than two inches square and not less than 1/2 inch (12.7 mm) square. If required to facilitate removal, the screen shall
32、 be of split construction. 3.7.2 V-belt guard. A protective guard of heavy gage wire or sheet metal shall be mounted to the fan unit to prevent objects from being jammed between the belts and sheaves. 3.7.3 Shaft and couDlinp guard. metal shall be mounted on the fan unit to completely enclose the mo
33、tor shaft, coupling, and fan shaft. A protective guard of heavy gage wire or sheet 3.7.4 Bearing-cooling fan guard. When a bearing-cooling fan is supplied (see 3.6.3.1), a protective guard of heavy gage wire mesh shall be mounted on the fan unit to completely enclose the bearing-cooling fan. 3.8 Lif
34、ting - attachments. When specified (see 7.2), suitable lifting attachment plate(s) shall be provided to enable the equipment to be lifted in its normal position. Attachment eye(s) shall be not less than three inches in diameter, and plate(s) shall withstand any handling conditions encountered, such
35、as rapid lowering and braking of the load. When practicable, only one attachment shall be used. Where more than one attachment is required, each attachment, when practicable, shall be of sufficient capacity to carry the total weight. copper or zinc-base-alloy or aluminum plate securely fastened to t
36、he unit shall indicate diagrammatically the lifting capacity of each attachment, A 3.9 Lubrication. Unless otherwise specified (see 7.2), means for lubricating shall be provided in accordance with the manufacturers standard practice. Parts requiring lubrication shall be so located as to make the lub
37、ricating points easily visible and accessible. properly lubricated before delivery. Manufacturers standard means for pressure lubrication shall be provided. All parts requiring lubrication shall be 3.10 Cleaning. treatment, and paintine. Surfaces normally painted in good commercial practice shall be
38、 cleaned, treated, and painted as specified herein. Surfaces to be painted shall be cleaned and dried to insure that they are free from contaminants such as oil, grease, welding slag and spatter, loose mill scale, water, dirt, corrosion product, or any other contaminating substances. As soon as prac
39、ticable after cleaning, and before any corrosion products or other contamination can result, the surfaces shall be prepared or treated to insure the adhesion of the coating system. The painting shall consist of at least one coat of primer and one finish coat. clean dry surface as soon as practicable
40、 after cleaning and treating. shall be with manufacturers current materials according to manufacturers The primer shall be applied to a Painting 4 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-current processes and the total dry film thickness sh
41、all be not less than 2.5 mils over the entire Curface. orange peel, or other defects. The paint shall be free from runs, sags, 3.11 Dissimilar metals. shall not be used unless separated by an insulating material which will avoid electrolytic corrosion. Metals dissimilar with respect to the galvanic
42、scale 4.0 REGULATORY REQUIREMENTS. 4.1 Materials. The offeror/contractor is encouraged to use recovered materials to the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation (FAR) unless otherwise specified herein, all equipment, material, and article
43、s incorporated in the work covered by this description are to be new and fabricated using materials produced from recovered materials to the maximum extent possible without jeopardizing the intended use. The term “recovered materials“ means materials which have been collected or recovered from solid
44、 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 are allowed under this description unless otherwise specified. 4.2 Metric DroductS. Products manufactured to metric
45、 dimension will be considered on an equal basis with those manufactured using inch-pound units, provided they fall within specified tolerances using conversion tables contained in the latest version of Federal Standard No. 376, and all other requirements of this Commercial Item Description including
46、 form, fit and function are met. If a product is manufactured to metric dimensions and those dimensions exceed the tolerances specified in the inch/pound units, a request should be made to the contracting officer to determine if the product is acceptable. officer has the option of accepting or rejec
47、ting the product. The contracting 4.3 CaDacitv test. in accordance with AMCA 210. test code. The fan shall be subjected to air volume and pressure tests The test shall be performed as outlined in the 5. QUALITY ASSURANCE PROVISIONS. 5.1 Contractor certification. The contractor shall certify and main
48、tain substantiating evidence that the product offered meets the salient characteristics of the Commercial Item Description, and that the product conforms to the producers own drawings, specifications, standards, and quality assurance practices, and is the same product offered for sale in the commerc
49、ial marketplace. conformance prior to first delivery and thereafter as may be otherwise provided for under the provisions of the contract. Contractor certifications shall include satisfactory evidence that the product meets requirements of AMCA 99, 210, 300, ANSI B15.1, NEMA ICs 1,2,6, NEMA MG 1 and RMA Engineering Standards for Multiple V-Belt Drives as applicable. The government reserves the right to require proof of such 6.0 PRESERVATION, PACKAGING, PACKING AND MARKING. Unless otherwise s
