1、INCH-POUNDA-A-59222May 18, 1998SUPERSEDINGW-F-2793July 2, 1992COMMERCIAL ITEM DESCRIPTIONFANS, CENTRIFUGAL, DRAFT, FORCED AND INDUCEDThe General Services Administration has authorized the use of this commercialitem description for al l Federal agencies.1. SCOPE. This commercial item description (CID
2、) covers centrifugal fans used in low-pressureboilers (less than 15 pounds per square inch (psi) (103 kilopascal (kPa) operating pressure) and inmedium and high pressure (greater than 15 psi (103 kPa) operating pressure) (coal, oil, and gasfired) power boiler plant systems.2. CLASSIFICATION. The cen
3、trifugal fans shall be of the following types and styles, asspecified (see 7.2):TYPESType I - Backward-curved blades.Typ e II - Radial-tip blades.Type III - Forward-curved blades.Type IV - Backward-inclined.Type V - Airfoil.Type VI - Radial blades.STYLESStyle 1 - Forced draft.Style 2 - Induced draft
4、.Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any datawhich may improve this document should be sent to: Commanding Officer (Code 15E2), NavalConstruction Battalion Center, 1000 23 rd Avenue, Port Hueneme, CA 93043-4301, by usingthe Standardization Document Im
5、provement Proposal (DD Form 1426) appearing at the end ofthis document or by letter.AMSC N/A FSC 4140Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5922223. SALIENT CHARACTERISTICS.3.1 Description . Centrifugal draft fans are used to develop dra
6、fts for use in power plant service.The fans create either forced or induced draft, or both in a balanced draft system. The fan unitshall consist of an electrical motor driven or a steam turbine driven centrifugal fan, a housing(scroll and side plates), controls, guards, and accessories. When feasibl
7、e, all components shall beattached to a common base with provisions for fastening to a foundation. Style 1 and style 2 fanunits shall be suitable for continuous boiler draft operation. The style 1 fan unit assembly shalloperate with preheated air temperatures not greater than 250 degrees Fahrenheit
8、( F)(121 degrees Celsius ( C). The style 2 fan unit assembly shall operate with flue gas temperaturesnot greater than 800 F (427 C). The equipment and accessories shall permit accessibility formaintenance and service in the field and be as such to prevent conditions hazardous to personnelor deleteri
9、ous to equipment. The fan unit shall comply with AMCA 99, and system requirementsas outlined in section 8 of AMCA 801, and testing requirements of AMCA 210, 203, or 803.3.2 Standard commercial product . The fan unit shall, as a minimum, be in accordance with therequirements of this CID and shall be
10、the manufacturers standard commercial product.Additional or better features which are not specifically prohibited by this CID, but which are apart of the manufacturers standard commercial product, shall be included in the fan unit beingfurnished. A standard commercial product is a product which is b
11、eing sold or is being currentlyoffered for sale on the commercial market through advertisements or manufacturers catalogs orbrochures, and represents the latest production model.3.3 Interchangeability . All fan units of the same classification furnished with similar optionsunder a specific contract
12、shall be identical to the extent necessary to ensure interchangeability ofcomponent parts, assemblies, accessories, and spare parts.3.4 Fan . The fan shall be of the single- or double-width centrifugal type as specified (see 7.2).The direction of fan rotation and discharge, and the position of inlet
13、 boxes shall comply with theapplicable standard designations of AMCA 99.3.4.1 Capacity and performance. The fan rating shall be based on standard air at 70 F (21 C);29.92 inches (101 kPa) barometric pressure (0.075 pound per cubic foot (1.201 kilogram percubic metre). The fan shall deliver at its st
14、andard rating, its rated capacity in cubic feet per minute(cubic metre per second) as specified (see 7.2) and at static pressure as specified (see 7.2). Thefan shall static efficiency shall be not less than that specified in table I in standard air at bestefficiency point.TABLE I. Fan static efficie
15、ncy .Type Static efficiencyI 70 percentII 70 percentIII 60 percentIV 70 percentV 80 percentVI 60 percentProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5922233.4.2 Fan wheel and shaft. The fan wheel (rotor) shall be of the backward-curved, forwar
16、d-curved radial-tip blade backward inclined or airfoil type as specified (see 7.2). The fan wheel andshaft assembly shall be balanced statically and dynamically.3.4.3 Sound power level. The sound power level shall be not greater than 90 decibels on the “A”scale ( dBA) of a standard sound level meter
17、 at 3-foot (0.914 metre (m) stations at a height of4.5 feet (1.372 m). The sound power level shall drop not less than 10 dBA when measured at adistance of 25 feet (7.62 m) and 4.5 feet (1.372 m) in height. Equipment which cannot complywith an 90 dBA limit at a 3-foot (0.914 m) station shall be ident
18、ified with appropriatedocumentation. Such documentation shall include the quantitative descriptions of the soundoutput of the equipment and also the quantitative information on the sound transmission betweenthe source and the listener at 3-foot (0.914 m) station and the 25-foot (7.62 m) station. Upo
19、nnotification by the contractor that the fan cannot comply with the requirements of this CID, thecontracting officer shall furnish to the contractor one Hazardous Noise label for each fan(see 4.3).3.4.4 Controls. Unless otherwise specified (see 7.2), the style 1 fan shall be equipped with aconstant-
20、speed driving unit and with adjustable inlet radial vanes. Unless otherwise specified(see 7.2), the style 2 fan shall be equipped with either parallel bladed inlet dampers for regulationof the air output volume, or manual or automatic positioning dampers. When specified (see 7.2),style 1 and style 2
21、 fans shall have a variable speed reducer with percent reduction speed asspecified (see 7.2).3.4.5 Power unit. The fan shall be driven by a steam turbine or electric motor as specified(see 7.2). The power unit rating shall be sufficient for handling of the fan load at the fan capacityspecified.3.4.6
22、 Turbine. The steam turbine shall conform to NEMA SM-23 and accommodate sufficientsteam to meet conditions and information in part 9, Steam Turbine Inquiry Guide as specified(see 7.2).3.4.7 Electric motor. The electric motor shall conform to NEMA MG-1 and be operable onelectrical current with charac
23、teristics as specified (see 7.2). The electric motor shall be sized tobring fan up to full operating speed in 20 seconds or less.3.5 Lubrication . Unless otherwise specified (see 7.2), a means for lubrication shall be inaccordance with the manufacturers standard practice. The lubricating points shal
24、l be easilyvisible and accessible without removing protective guards. Hydraulic lubrication fittings shall bein accordance with SAE J534. Where use of high-pressure lubricating equipment, 1,000 psi(6 894 kPa) or higher, will damage grease seals or other parts, a suitable warning shall be affixedto t
25、he equipment in a conspicuous location.3.6 Cleaning, treatment, and painting . Surfaces normally painted in good commercial practiceshall be cleaned, treated, and painted as specified herein. The color of the finish coat shall be asspecified (see 7.2). Surfaces to be painted shall be cleaned and dri
26、ed to ensure they are free fromProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-592224contaminates such as oil, grease, welding slag and spatter, loose mill scale, water, dirt, corrosionproduct, or any other contaminating substances. As soon as pr
27、acticable after cleaning and beforeany corrosion product or contamination can result, the surfaces shall be prepared or treated toensure the adhesion of the coating system. The painting shall consist of at least one coat ofprimer and one finish coat. The primer shall be applied to a clean, dry surfa
28、ce as soon aspracticable after cleaning and treating. Painting shall be with manufacturers current materialsaccording to manufacturers current processes and the total dry film thickness shall be not lessthan 2.5 mils over the entire surface. The paint shall be free from runs, sags, orange peel, or o
29、therdefects.3.7 Identification marking . Identification shall be permanently and legibly marked directly on thefan unit or on a corrosion-resisting metal plate securely attached to the unit at source ofmanufacturer. Identification shall include the manufacturers model and serial number, name, andtra
30、demark to be readily identifiable to the manufacturer.3.8 Workmanship .3.8.1 All operations and processes involved in accomplishing the requirements of this CID shallbe in accordance with the highest grade practices associated with this type of work.4. REGULATORY REQUIREMENTS.4.1 Materials . The off
31、eror/contractor is encouraged to use recovered materials to the maximumextent practicable, in accordance with paragraph 23.403 of the Federal Acquisition Regulation(FAR). Unless otherwise specified herein, all equipment, material, and articles incorporated in thework covered by this commercial item
32、description are to be new and fabricated using materialsproduced from recovered materials to the maximum extent possible without jeopardizing theintended use. The term “recovered materials” means materials which have been collected orrecovered from solid waste and reprocessed to become a source of r
33、aw materials, as opposed tovirgin raw materials. Unless otherwise specified, none of the above shall be interpreted to meanthat the use of used or rebuilt products are allowed under this commercial item description.4.2 Metric products . Products manufactured to metric dimensions will be considered o
34、n an equalbasis with those manufactured using inch-pound units, provided they fall within specifiedtolerances using conversion tables contained in the latest version of ASTM SI-10(IEEE/ASTM SI-10), and all other requirements of this commercial item description includingform, fit, and function are me
35、t. If a product is manufactured to metric dimensions and thesedimensions exceed the tolerances specified in the inch-pound units, a request should be made tothe contracting officer to determine if the product is acceptable. The contracting officer has theoption of accepting or rejecting the product.
36、4.3 Sound power level . The sound power level specified herein are levels of noise normallyproduced by power plant fans. Some fans may be not greater than 90 dBA at the 3-footProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-592225(0.914 m) station
37、. Sound power levels greater than 90 dBA should have engineering controlsapplied to the installation to reduce the sound power level to 90 dBA as specified in Code ofFederal Regulations 29, part 1926.5. QUALITY ASSURANCE PROVISIONS.5.1 Product conformance . The products provided shall meet the salie
38、nt characteristics of thiscommercial item description, conform to the producers own drawings, specifications, standards,and quality assurance practices, and be the same product offered for sale in the commercialmarket. The government reserves the right to require proof of such conformance.6. PACKAGI
39、NG. The preservation, packing, and marking shall be as specified in the contract ororder.7. NOTES.7.1 Source of documents .7.1.1 The Federal Acquisition Regulation (FAR) and Code of Federal Regulations (CFR) may beobtained from the Superintendent of Documents, U.S. Government Printing Office, Washin
40、gton,DC 20402.7.1.2 AMCA Standards are available from the Air Movement and Control Association, 30 WestUniversity Drive, Arlington Heights, IL 60004.7.1.3 ASTM Standards are available from the American Society of Testing and Materials,100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.7.1.4 IEE
41、E Standards are available from the Institute of Electrical and Electronic Engineers(IEEE), IEEE Service Center, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331.7.1.5 NEMA Standards are available from the National Electrical Manufacturers Association,1300 North 17 th Street, Suite 1847, Rossl
42、yn, VA 22209.7.2 Ordering data . Acquisition documents should specify the following:a. Title, number, and date of this CID.b. Type and style of fan required (see 2).c. Whether fan is to have single or double inlet, direction of rotation and discharge, rotationand discharge, and position of inlet box
43、es (see 3.4).d. Required rating capacity and static pressure at standard rating which may be adjusted toallow for operating in environmental conditions which may impact fan operation and noiselevels i.e., temperature, altitude, and hostile environmental conditions (see 3.4.1).e. Type of wheel (rotor
44、) required (see 3.4.2).Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-592226f. When the driving unit for the style 1 fan and controls for fans is to be different; when inletdampers are to be different for style 2 fan. When variable speed is requ
45、ired and type ofspeed reducer with percent of reduction speed (see 3.4.4).g. Type of drive (steam turbine or electric motor); steam conditions and required informationin part 9, Steam Turbine Inquiry Guide of NEMA SM-23 (see 3.4.5 and 3.4.6).h. When lubrication is to be different (see 3.5).i. Color
46、of finish coat (see 3.6).7.3 Supersession data . This CID replaces Federal Specification W-F-2793, dated July 2, 1992.7.4 Classification cross reference . Classifications used in this CID (see 2.) are identical to thosefound in superseded Federal Specification W-F-2793.7.5 Pin Identification Number
47、(PIN) . The following part identification numbering procedure isfor government purposes and does not constitute a requirement for the contractor. The PIN to beused for items acquired to this description are created as follows:AA59222 - XCID numberType and style code letter (see table II)TABLE II. Co
48、de letter to type and style .TypeStyle I II III IV V VI1 A C E G I L2 B D F H J M7.6 Metric units . The values stated in either inch-pound or SI units are to be regarded separatelyas standard. Within the text, the SI units are shown in brackets. The values stated in each systemare not exact equivale
49、nts; therefore, each system should be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.7.7 Subject term (keyword) listing .AirBoilerFansFlue gasPower plantProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-592227MILITARY INTERESTS: CIVIL AGENCY COORDINATING ACTIVITY:Custodians : GSA-FSSNavy - YD1Air Force - 99 Preparing Activity :N
