1、Designation: F998 10An American National StandardStandard Specification forCentrifugal Pump, Shipboard Use1This standard is issued under the fixed designation F998; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last r
2、evision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () 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 shipboardapplic
3、ation. 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 provi
4、dedfor information purposes only.2. Referenced Documents2.1 ASTM Standards:2A36/A36M Specification for Carbon Structural SteelA193/A193M Specification for Alloy-Steel and StainlessSteel Bolting Materials for High Temperature or HighPressure Service and Other Special Purpose ApplicationsA194/A194M Sp
5、ecification for Carbon and Alloy SteelNuts for Bolts for High Pressure or High TemperatureService, or BothA276 Specification for Stainless Steel Bars and ShapesA494/A494M Specification for Castings, Nickel and NickelAlloyA582/A582M Specification for Free-Machining StainlessSteel BarsA743/A743M Speci
6、fication for Castings, Iron-Chromium,Iron-Chromium-Nickel, Corrosion Resistant, for GeneralApplicationA747/A747M Specification for Steel Castings, Stainless,Precipitation HardeningA890/A890M Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex(Austenitic/Ferritic)
7、for General ApplicationB148 Specification for Aluminum-Bronze Sand CastingsB164 Specification for Nickel-Copper Alloy Rod, Bar, andWireB271 Specification for Copper-Base Alloy CentrifugalCastingsB369 Specification for Copper-Nickel Alloy CastingsB505/B505M Specification for Copper Alloy ContinuousCa
8、stingsB584 Specification for Copper Alloy Sand Castings forGeneral ApplicationsF468 Specification for Nonferrous Bolts, Hex Cap Screws,and Studs for General UseF1511 Specification for Mechanical Seals for ShipboardPump Applications2.2 ANSI Standards:B1 ISO Metric Screw Threads (ANSI-B1 Report)3B1.1
9、Unified Screw Threads3B16.1 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 Instit
10、ute Standards:ANSI/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, App
11、licationsand Sound 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 QualityAssuranceDesign/Development, Production, Installation and Service33. Terminology3.1 Definit
12、ions: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 March 1, 2010. Published March 2010. Originallyapproved in 1997. Last previous edition app
13、roved in 2004 as F998 04. DOI:10.1520/F0998-10.2For 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 standards Document Summary page onthe ASTM website.3Available fro
14、m American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Anti-Friction Bearing Manufacturers Association, Inc., 1101 Connecticut Ave.,N.W., Suite 700, Washington, DC 20036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West
15、 Conshohocken, PA 19428-2959, United States.3.1.1 best effciency point (BEP), nthe capacity and headin which the pump efficiency is the highest.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
16、, na kinetic machine convertingmechanical energy into hydraulic energy 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
17、 motor shaft.3.1.6 coupled pumps, nin this arrangement, the pump andthe 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
18、arbitrary datum. It is expressed in unitsof energy per unit of weight 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 centerl
19、ineand the gauge centerline.3.1.10 head, total, nthe measurement of 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, t
20、he velocity head at the gauge connection, and theelevation difference 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 pressur
21、e to theassembled pump or pressure containing components to deter-mine 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 ma
22、ximum BHP rated impeller, nthe highest powerrequired by a pump with 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 positiv
23、e suction head available (NPSHA), nthetotal suction head absolute, 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 t
24、o prevent more than a 3 % loss in total head from thefirst stage of 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
25、 (PTFE), or any similar material.3.1.20 non-overloading power characteristics, 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), n
26、the U.S.customary measure of pressure with zero as a true absolutezero 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
27、 energyimparted to the liquid by the pump to the energy supplied to 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
28、, napplies to the capacity, head, netpositive suction head, and speed 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
29、 its own vapor. The vapor pressureis a function of the substance and 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 an
30、d Fig. 2 marked“User Defined,” must be completed by the procuring activityand 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 section
31、s of Fig. 1 and Fig. 2marked “OEM Defined,” and return the data sheet 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 guid
32、e.Other materials may be substituted as approved by the pur-chasing 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 s
33、hall be such that any rubbing, sliding, or tight clearanceparts shall 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)
34、pump components where the use of that materialF998 102FIG. 1 Centrifugal Pump Ordering Data (English)F998 103FIG. 2 Centrifugal Pump Ordering Data (Metric)F998 104can benefit the operation and maintenance of the pump.Purchaser approval must be obtained for the use of nonmetallicmaterials.6. General
35、Requirements6.1 Pumps shall be designed to meet all operational require-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
36、Motors shall have power ratings, including a servicefactor, if any, at 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
37、 pump-rated design condition for motorsgreater than 75 hp. The power required 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.
38、2. Pumps shall also be capable ofsustained operation at the maximum angles 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
39、maintain proper alignment, dowels or fitted bolts shall beprovided.6.6 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.
40、6.7 Bedplates for Class 3 pumps shall be equipped withdriprims and drain 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 shal
41、l be keyed to bothshafts.TABLE 1 Material SpecificationsClass 1: Freshwater Class 2: SeawaterAClass 3: HydrocarbonCasing and PressureBoundary PartsBronze(Specification B584, Alloy C90500,C92200, or C87500)Corrosion-resistant Duplex Alloy(Specification A890/A890M, Grade CD4MCu)Bronze(Specification B5
42、84, Alloy C90500, C92200,or C87500)Stainless Steel(Specification A743/A743M,CF8M)Ni-Al Bronze(Specification B148, Alloy C95500 orC95800)Stainless Steel(Specification A743/A743M,CF8M, J92900)Shaft and RotorPartsStainless Steel(Specification A582/A582M, Cond, AlloyS41600)Stainless Steel(Specification
43、A276, S31600)Stainless Steel(Specification A582/A582M A, Alloy S41600)Nickel-copper alloy(Specification B164, UNS N04400 orN04405)Nickel-copper Alloy (Monel)(Specification B164, UNS N04400)CompositeB(shaft sleeves only) CompositeB(shaft sleeves only)Impellers Bronze(Specification B584, Alloy C90500,
44、C92200, or C87500)Corrosion-resistant Duplex Alloy(Specification A890/A890M, Grade CD4MCu)Bronze(Specification B584, Alloy C90500, C92200,or C87500)Stainless Steel(Specification A743/A743M,Grade CF8M or CF8)Ni-Al Bronze(Specification B148, UNS C95500 orC95800)Stainless Steel(Specification A743/A743M
45、,Grade CF8M or CF8)CompositeBCompositeBWear Rings Bronze(Specification B271, B505/B505M or B584)Stainless Steel(Specification A747/A747M, CB7Cu-1, CondH1150, J92180)Bronze(Specification B271, B505/B505M,orB584)CompositeBBronze(Specification B271, B505/B505M or B584)CompositeBCasting Fasteners Corros
46、ion-resisting steel(Specification A193/A193M, Grade B8Mand A194/A194M, Grade 8M)Monel(Specification F468, Alloy 400)Corrosion-resisting steel(Specification A193/A193M, Grade B8M andA194/A194M, Grade 8M)Corrosion-resisting steel(Specification A193/A193M, GradeB8M and A194/A194M, Grade 8M)Base Structu
47、ral Steel(Specification A36/A36M)Structural Steel(Specification A36/A36M)Structural Steel(Specification A36/A36M)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
48、property of composites must be suitable for pump service life and intended service.F998 1056.9 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 s
49、upport a 200-lb (88-kg) person.6.10 Pump and 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 uni
