1、Designation: F998 12 (Reapproved 2018) An 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,
2、 the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () 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
3、shipboardapplication. 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 standard. The values given in parenthese
4、s are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of
5、International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A36/A36M Specification for Carbon Structural SteelA193/A193M Specification for Alloy-Steel and StainlessSteel Bolting for
6、High Temperature or High PressureService and Other Special Purpose ApplicationsA194/A194M Specification for Carbon Steel, Alloy Steel,and Stainless Steel Nuts for Bolts for High Pressure orHigh Temperature Service, or BothA276 Specification for Stainless Steel Bars and ShapesA494/A494M Specification
7、 for Castings, Nickel and NickelAlloyA582/A582M Specification for Free-Machining StainlessSteel BarsA743/A743M Specification for Castings, Iron-Chromium,Iron-Chromium-Nickel, Corrosion Resistant, for GeneralApplicationA747/A747M Specification for Steel Castings, Stainless,Precipitation HardeningA890
8、/A890M Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex(Austenitic/Ferritic) for General ApplicationA995/A995M Specification for Castings, Austenitic-Ferritic(Duplex) Stainless Steel, for Pressure-Containing PartsB148 Specification for Aluminum-Bronze Sand Cast
9、ingsB164 Specification for Nickel-Copper Alloy Rod, Bar, andWireB271 Specification for Copper-Base Alloy Centrifugal Cast-ingsB369 Specification for Copper-Nickel Alloy CastingsB505/B505M Specification for Copper Alloy ContinuousCastingsB584 Specification for Copper Alloy Sand Castings forGeneral Ap
10、plicationsF468 Specification for Nonferrous Bolts, Hex Cap Screws,Socket Head Cap Screws, and Studs for General UseF1511 Specification for Mechanical Seals for ShipboardPump Applications2.2 ANSI Standards:3ANSI B1 ISO Metric Screw Threads (ANSI-B1 Report)ANSI B1.1 Unified Screw ThreadsANSI B16.1 Cas
11、t Iron Pipe Flanges and Flange FittingsANSI B16.5 Steel Pipe Flanges, Flanged Valves andFittings, 150, 300, 400, 600, 900, 1500, and 2500 lbANSI B16.11 Forged Steel Fittings, Socket Welding andThreadedANSI B16.24 Bronze Flanges and Flanged Fittings, 150,300 lb2.3 Hydraulic Institute Standards:3ANSI/
12、HI 1.1-1.5 American National Standard for Centrifu-gal Pumps for Nomenclature, Definitions, Applicationsand OperationANSI/HI 1.6 American National Standard for CentrifugalPump Tests1This specification is under the jurisdiction of Committee F25 on Ships andMarine Technology and is the direct responsi
13、bility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved March 1, 2018. Published April 2018. Originallyapproved in 1997. Last previous edition approved in 2012 as F998 12. DOI:10.1520/F0998-12R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orco
14、ntact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.Copyrigh
15、t ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International
16、 Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1ANSI/HI 9.1-9.6 American National Standard for PumpsGeneral Guidelines for Types, Definitions, Applicationsand Sound Measurements2.4 ABMA Standards:4ANSI/ABMA 9 Load Ratings and
17、 Fatigue Life for BallBearingsANSI/ABMA 11 Load Ratings and Fatigue Life for RollerBearings2.5 ISO Standards:3ISO 9001 Quality Systems and Quality AssuranceDesign/Development, Production, Installation and Service3. Terminology3.1 Definitions:3.1.1 best effciency point (BEP), nthe capacity and headin
18、 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, na kinetic machine convertingmechanical energy into hydraulic energy through rotatingmotion.3.1.5 cl
19、ose 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 andthe motor must use a coupling to t
20、ransmit the power from thedriver to the pump shaft.3.1.7 gallons per minute (GPM), nU.S. customary unit forcapacity.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 weight liquid. The measuring unit forhe
21、ad is foot (metre) of liquid.3.1.9 head, total discharge, nthe sum of the pumpsdischarge gauge head, the velocity head at the gaugeconnection, and the elevation difference between the pumpcenterline and the gauge centerline.3.1.10 head, total, nthe measurement of energy increaseper unit weight of th
22、e 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 difference between the pump inlet centerline
23、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-mine structural integrity of the unit.
24、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 the correct impeller diameter for th
25、eservice 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, determined at the first stageimpeller
26、 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 the pump at a specific capacity.3.1.
27、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 characteristics, nthis char-acteristic req
28、uires 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 absolutezero in pounds per square inch.3.1.23
29、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 thepump from the driver.3.1.25 pump
30、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 speed of the pump as specified bythe ord
31、er.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 and of the temperature.3.1.29 viscosity
32、, 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 activity4Available fromAmerican Bearin
33、g ManufacturersAssociation (ABMA), 330 N.Wabash Ave., Ste. 2000, Chicago, IL 60611, https:/www.americanbearings.org.F998 12 (2018)2FIG. 1 Centrifugal Pump Ordering Data (English)F998 12 (2018)3FIG. 2 Centrifugal Pump Ordering Data (Metric)F998 12 (2018)4and submitted with the request for bid. This w
34、ill ensure that thepotential bidder provides a pump unit that meets allperformance, operational, and reliability requirements of thepurchaser. The OEM will fill out all sections of Fig. 1 and Fig.2 marked “OEM Defined,” and return the data sheet to thepurchaser upon delivery of the pump.4.2 For the
35、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 activity and as specified in Fig. 1 and Fig. 2.5.2 When
36、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 shall be selected so that no binding or galling occurs.Speci
37、al 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 materialcan benefit the operation and maintenance of the pump.Purchaser approval must
38、be obtained for the use of nonmetallicmaterials.6. General 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
39、 bestefficiency point (BEP) on the head-capacity curve.6.3 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 rate
40、d between 30 and 75 hp and 110 % of pumpbrake-horsepower at 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.TABLE 1 Material SpecificationsClass 1: Freshwater Class 2: SeawaterAClass 3: Hydr
41、ocarbonCasing and PressureBoundary PartsBronze(Specification B584, Alloy C90500,C92200, or C87500)Corrosion-resistant Duplex Alloy(Specification A890/A890M or A995/A995M,Grade CD4MCuN)Bronze(Specification B584, Alloy C90500, C92200,or C87500)Stainless Steel(Specification A743/A743M,CF8M)Ni-Al Bronze
42、(Specification B148, Alloy C95500 orC95800)Stainless Steel(Specification A743/A743M,CF8M, J92900)Shaft and RotorPartsStainless Steel(Specification A582/A582M, Cond, AlloyS41600)Stainless Steel(Specification A276, S31600)Stainless Steel(Specification A582/A582M A, Alloy S41600)Nickel-copper alloy(Spe
43、cification 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,C92200, or C87500)Corrosion-resistant Duplex Alloy(Specification A890/A890M or A995/A995M,Gra
44、de CD4MCuN)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,Grade CF8M or CF8)CompositeBCompositeBWear Rings Bronze(Specification B271, B5
45、05/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 Corrosion-resisting steel(Specification A193/A193M, Grade B8Mand A194/A194M, Grade 8M
46、)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 Structural Steel(Specification A36/A36M)Structural Steel(Specification A36/A36M)Struct
47、ural 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 choosing allowablematerials.BMaterial property of composites must be suitable for pump service life and intended serv
48、ice.F998 12 (2018)56.4 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 angles of list and trimspecified in Fig. 1 and Fig. 2.6.5 For horizontal
49、 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 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 drain connectio
