1、Designation: F 998 04An American National StandardStandard Specification forCentrifugal Pump, Shipboard Use1This standard is issued under the fixed designation F 998; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the requirements applicable tothe design and construction of centrifugal pumps for shipboardapp
3、lication. The three classes of service covered by thisspecification are as follows:1.1.1 Class 1Freshwater,1.1.2 Class 2Seawater, and1.1.3 Class 3Hydrocarbon pumps (less than 1500 SSU).1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are pr
4、ovidedfor information purposes only.2. Referenced Documents2.1 ASTM Standards:2A 36/A 36M Specification for Carbon Structural SteelA 193/A 193M Specification for Alloy-Steel and StainlessSteel Bolting Materials for High-Temperature ServiceA 194/A 194M Specification for Carbon and Alloy SteelNuts for
5、 Bolts for High Pressure or High TemperatureService, or BothA 276 Specification for Stainless Steel Bars and ShapesA 494/A 494M Specification for Castings, Nickel andNickel AlloyA 582/A 582M Specification for Free-Machining StainlessSteel BarsA 743/A 743M Specification for Castings, Iron-Chromium,Ir
6、on-Chromium-Nickel, Corrosion-Resistant, for GeneralApplicationA 747/A 747M Specification for Steel Castings, Stainless,Precipitation HardeningA 890/A 890 Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion Resistant, Du-plex (Austentitic/Ferritic) for General Applications
7、B 148 Specification for Aluminum-Bronze Sand CastingsB 164 Specification for Nickel-Copper Alloy Rod, Bar, andWireB 271 Specification for Copper-Base Alloy CentrifugalCastingsB 369 Specification for Copper-Nickel Alloy CastingsB 505 Specification for Copper-Base Alloy ContinuousCastingsB 584 Specifi
8、cation for Copper Alloy Sand Castings forGeneral ApplicationsF 468 Specification for Nonferrous Bolts, Hex Cap Screws,and Studs for General UseF 1511 Specification for Mechanical Seals for ShipboardPump Applications2.2 ANSI Standards:B1 ISO Metric Screw Threads (ANSI-B1 Report)3B1.1 Unified Screw Th
9、reads3B16.1 Cast Iron Pipe Flanges and Flange Fittings3B16.5 Steel Pipe Flanges, Flanged Valves and Fittings, 150,300, 400, 600, 900, 1500 and 2500 lb.3B16.11 Forged Steel Fittings, Socket Welding andThreaded3B16.24 Bronze Flanges and Flanged Fittings, 150, 300lb32.3 Hydraulic Institute Standards:AN
10、SI/HI 1.1-1.5 American National Standard for Centrifu-gal Pumps for Nomenclature, Definitions, Applicationsand Operation3ANSI/HI 1.6 American National Standard for CentrifugalPump Tests3ANSI/HI 9.1-9.6 American National Standard for PumpsGeneral Guidelines for Types, Definitions, Applicationsand Sou
11、nd Measurements32.4 AFBMA Standards:9 Load Ratings and Fatigue Life for Ball Bearings411 Load Ratings and Fatigue Life for Roller Bearings42.5 ISO Standards:ISO 9001 Quality Systems and Quality AssuranceDesign/Development, Production, Installation and Service33. Terminology3.1 Definitions:3.1.1 best
12、 effciency point (BEP), nthe capacity and headin which the pump efficiency is the highest.1This specification is under the jurisdiction of Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1
13、, 2004. Published May 2004. Originallyapproved in 1997. Last previous edition approved in 2002 as F 998 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the stand
14、ards Document Summary page onthe ASTM website.3Available from American National Standards Institute, 25 W. 43rd St., 4thFloor, New York, NY 10036.4Anti-Friction Bearing Manufacturers Association, Inc., 1101 Connecticut Ave.,N.W., Suite 700, Washington, DC 20036.1Copyright ASTM International, 100 Bar
15、r Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.2 BHP, npower delivered to the pump from the driverin brake horse power.3.1.3 capacity, nthe total volume output per unit of time.3.1.4 centrifugal pump, na kinetic machine convertingmechanical energy into hydraulic ene
16、rgy through rotatingmotion.3.1.5 close coupled pumps, nin this arrangement, nocoupling is provided between the pump and the motor shafts,and the pump housing is flange mounted to the motor. Thepump impeller is directly mounted to the motor shaft.3.1.6 coupled pumps, nin this arrangement, the pump an
17、dthe motor must use a coupling to transmit the power from thedriver to the pump shaft.3.1.7 gallons per minute (GPM), nU.S. customary unitfor capacity.3.1.8 head, nthe expression of the energy content of theliquid referred to in any arbitrary datum. It is expressed in unitsof energy per unit of weig
18、ht liquid. The measuring unit forhead is foot (metre) of liquid.3.1.9 head, total discharge, nthe sum of the pumpsdischarge gauge head, the velocity head at the gauge connec-tion, and the elevation difference between the pump centerlineand the gauge centerline.3.1.10 head, total, nthe measurement of
19、 energy increaseper unit weight of the liquid, imparted to the liquid by thepump, and is the difference between the total discharge headand the total suction head.3.1.11 head, total suction, nthe sum of the pumps suctiongauge head, the velocity head at the gauge connection, and theelevation differen
20、ce between the pump inlet centerline and thegauge centerline.3.1.12 head, maximum rated, nthe most head a pump cangenerate with the correct impeller diameter for the serviceconditions.3.1.13 hydrostatic test, napplying static pressure to theassembled pump or pressure containing components to deter-m
21、ine structural integrity of the unit.3.1.14 maximum allowable working pressure, nthe maxi-mum discharge pressure that could occur in the pump when itis operated at the rated speed and suction pressure for a givenapplication.3.1.15 maximum BHP rated impeller, nthe highest powerrequired by a pump with
22、 the correct impeller diameter for theservice condition.3.1.16 minimum continuous flow, nthe lowest possibleflow rate at which the pump can run without generatingexcessive heat within the unit or damage to the pump.3.1.17 net positive suction head available (NPSHA), nthetotal suction head absolute,
23、determined at the first stageimpeller datum, less the absolute vapor pressure of the liquid ata specific capacity.3.1.18 net positive suction head required (NPSHR), ntheamount of suction head over vapor pressure required at thepump to prevent more than a 3 % loss in total head from thefirst stage of
24、 the pump at a specific capacity.3.1.19 nonmetallic materials, nany material that wouldnot be recognized as a metal. Examples include plastics,fiberglass resins, carbon fiber, fiberglass-reinforced vinyl ester,polytetrafluoroethylene (PTFE), or any similar material.3.1.20 non-overloading power chara
25、cteristics, nthis char-acteristic requires that the driver be sized for the highestpossible power requirement from the pump.3.1.21 OEM, noriginal equipment manufacturer of thepump unit.3.1.22 pounds per square inch absolute (PSIA), nthe U.S.customary measure of pressure with zero as a true absolutez
26、ero in pounds per square inch.3.1.23 pounds per square inch gauge (PSIG), nthe U.S.customary measure of pressure with zero being adjusted toatmospheric pressure in pounds per square inch.3.1.24 pump effciency (Eff), nthe ratio of the energyimparted to the liquid by the pump to the energy supplied to
27、 thepump from the driver.3.1.25 pump unit, na typical pump unit consists of aseparate pump and driver, combined pump and driver (closecoupled), coupling, and coupling guard, and may include agear box and base plate.3.1.26 rated point, napplies to the capacity, head, netpositive suction head, and spe
28、ed of the pump as specified bythe order.3.1.27 specific gravity (Sp. Gr.), nthe ratio of the densityof the liquid to the density of water at 64F (17.8C).3.1.28 vapor pressure, nthe pressure exerted when aliquid is in equilibrium with its own vapor. The vapor pressureis a function of the substance an
29、d of the temperature.3.1.29 viscosity, nthe resistance of a fluid to shear motion,its internal friction.4. Ordering Information4.1 Fig. 1 and Fig. 2 are provided for use by the procuringactivity and the OEM. The sections of Fig. 1 and Fig. 2 marked“User Defined,” must be completed by the procuring a
30、ctivityand submitted with the request for bid. This will ensure that thepotential bidder provides a pump unit that meets all perfor-mance, operational, and reliability requirements of the pur-chaser. The OEM will fill out all sections of Fig. 1 and Fig. 2marked “OEM Defined,” and return the data she
31、et to thepurchaser upon delivery of the pump.4.2 For the convenience of the procuring activity, Fig. 1 andFig. 2 are provided in both U.S. customary and SI versions.5. Material5.1 The materials cited in Table 1 are provided as a guide.Other materials may be substituted as approved by the pur-chasing
32、 activity and as specified in Fig. 1 and Fig. 2.5.2 When selecting material combinations, the pump sup-plier shall take into consideration the conditions under whichthe various materials interact with each other. Material hard-ness shall be such that any rubbing, sliding, or tight clearanceparts sha
33、ll be selected so that no binding or galling occurs.Special care shall be taken with Class 2 pump materials thatinteract with each other in a seawater environment.5.3 Consideration shall be given to the use of nonmetallic(composite) pump components where the use of that materialF998042FIG. 1 Centrif
34、ugal Pump Ordering Data (English)F998043FIG. 2 Centrifugal Pump Ordering Data (Metric)F998044can benefit the operation and maintenance of the pump.Purchaser approval must be obtained for the use of nonmetallicmaterials.6. General Requirements6.1 Pumps shall be designed to meet all operational requir
35、e-ments of the intended service and be constructed in such amanner as to allow for reliable operation and maintenance.6.2 Pumps shall be selected to operate at or near the bestefficiency point (BEP) on the head-capacity curve.6.3 Motors shall have power ratings, including a servicefactor, if any, at
36、 least equal to 125 % of pump brake-horsepower at rated design condition for motors less than 30hp, 115 % of pump brake-horsepower at rated design conditionfor motors rated between 30 and 75 hp and 110 % of pumpbrake-horsepower at pump-rated design condition for motorsgreater than 75 hp. The power r
37、equired at pump-rated condi-tions shall not exceed the motor nameplate horsepower rating.6.4 Pumps shall be designed for a shipboard environmentincluding both pitch and roll conditions specified by thepurchaser in Fig. 1 and Fig. 2. Pumps shall also be capable ofsustained operation at the maximum an
38、gles of list and trimspecified in Fig. 1 and Fig. 2.6.5 For horizontal pumps, the pump and driver shall bemounted on a common base of sufficient strength and stiffnessto allow for proper alignment and operation. Where necessaryto maintain proper alignment, dowels or fitted bolts shall beprovided.6.6
39、 All vertical pumps shall be entirely supported by ahorizontal foundation or a vertical ship structure, but not both.Where necessary, the upper portion of the pump unit may bebolted to a frame erected on the horizontal foundation.6.7 Bedplates for Class 3 pumps shall be equipped withdriprims and dra
40、in connections.6.8 Horizontal pumps of the coupled type shall be driventhrough a flexible coupling. Coupled vertical pumps may beconnected to their drivers by a flexible or rigid coupling.Couplings between the pump and driver shall be keyed to bothshafts.TABLE 1 Material SpecificationsClass 1: Fresh
41、water Class 2: SeawaterAClass 3: HydrocarbonCasing and PressureBoundary PartsBronze(Specification B 584, Alloy C90500,C92200, or C87500)Corrosion-resistant Duplex Alloy(Specification A 890/A 890M, GradeCD4MCu)Bronze(Specification B 584, Alloy C90500, C92200,or C87500)Stainless Steel(Specification A
42、743/A 743M,CF8M)Ni-Al Bronze(Specification B 148, Alloy C95500 orC95800)Stainless Steel(Specification A 743/A 743M,CF8M, J92900)Shaft and RotorPartsStainless Steel(Specification A 582/A 582M, Cond, AlloyS41600)Stainless Steel(Specification A276, S31600)Stainless Steel(Specification A58/A 582M A, All
43、oy S41600)Nickel-copper alloy(Specification B 164, UNS N04400 orN04405)Nickel-copper Alloy (Monel)(Specification B 164, UNS N04400)CompositeB(shaft sleeves only) CompositeB(shaft sleeves only)Impellers Bronze(Specification B 584, Alloy C90500,C92200, or C87500)Corrosion-resistant Duplex Alloy(Specif
44、ication A 890/A 890M, GradeCD4MCu)Bronze(Specification B 584, Alloy C90500, C92200,or C87500)Stainless Steel(Specification A 743/A 743M,Grade CF8M or CF8)Ni-Al Bronze(Specification B 148, UNS C95500 orC95800)Stainless Steel(Specification A 743/A 743M,Grade CF8M or CF8)CompositeBCompositeBWear Rings
45、Bronze(Specification B 271, B 505 or B 584)Stainless Steel(Specification A 747, CB7Cu-1, CondH1150, J92180)Bronze(Specification B 271, B 505, or B 584)CompositeBBronze(Specification B 271, B 505 or B 584)CompositeBCasting Fasteners Corrosion-resisting steel(Specification A 193/A 193M, Grade B8Mand A
46、 194/A 194M, Grade 8M)Monel(Specification F 468, Alloy 400)Corrosion-resisting steel(Specification A 193/A 193M, Grade B8M andA 194/A 194M, Grade 8M)Corrosion-resisting steel(Specification A 193/A 193M, GradeB8M and A 194/A 194M, Grade 8M)Base Structural Steel(Specification A 36/A 36M)Structural Ste
47、el(Specification A 36/A 36M)Structural Steel(Specification A 36/A 36M)AMaterials used for seawater services may also be used for Class 1 and 3 service pumps. Galvanic compatibility must be taken into consideration when choosingallowable materials.BMaterial property of composites must be suitable for
48、 pump service life and intended service.F9980456.9 All pump units shall incorporate guards over the cou-plings, belts, and other external rotating parts. The guards shallprevent personnel contact with the rotating elements. Guardsshall be rigid enough to support a 200-lb (88-kg) person.6.10 Pump and
49、 driver seating surfaces of mounting bed-plates, bracket mounting plates, or other mounting arrange-ments shall be machined.6.11 Sufficient means shall be provided for attaching con-ventional lifting gear for the installation, removal, and main-tenance of both the pump and driver.6.12 Pumps with face-mounted motors shall be arrangedsuch that there are four possible orientations of the motor topump.6.13 Shaft alignment between the pump and driver will bespecified by the OEM to allow the pump unit to operate withinthe vibration limits set in Sec
