1、Designation: F998 12 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, the year of last
2、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 shipboardapplicati
3、on. 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 provided
4、for information purposes only.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 International Standards, Guides and Recom-mendations issued by the World Trade Org
5、anization 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 High Temperature or High PressureService and Other Special Purpose ApplicationsA19
6、4/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 for Castings, Nickel and NickelAlloyA582/A582M Specification for Free-Machining S
7、tainlessSteel BarsA743/A743M Specification 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-Resis
8、tant, Duplex(Austenitic/Ferritic) for General ApplicationA995/A995M Specification for Castings, Austenitic-Ferritic(Duplex) Stainless Steel, for Pressure-Containing PartsB148 Specification for Aluminum-Bronze Sand CastingsB164 Specification for Nickel-Copper Alloy Rod, Bar, andWireB271 Specification
9、 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 ApplicationsF468 Specification for Nonferrous Bolts, Hex Cap Screws,Socket Head Cap
10、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 Unified Screw Threads3B16.1 Cast Iron Pipe Flanges and Flange Fittings3B16.5 Steel Pipe Flanges, Flanged Valves and Fittings, 1
11、50,300, 400, 600, 900, 1500 and 2500 lb.3B16.11 Forged Steel Fittings, Socket Welding and Threaded3B16.24 Bronze Flanges and Flanged Fittings, 150, 300lb32.3 Hydraulic Institute Standards:ANSI/HI 1.1-1.5 American National Standard for Centrifu-gal Pumps for Nomenclature, Definitions, Applicationsand
12、 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 Sound Measurements31This specification is under the jurisdiction of Committee F25 on Ships andMarine Technology a
13、nd is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1, 2012. Published June 2012. Originallyapproved in 1997. Last previous edition approved in 2010 as F998 10. DOI:10.1520/F0998-12.2For referenced ASTM standards, visit the ASTM website,
14、 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 from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/ww
15、w.ansi.org.Copyright 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 theDevelopme
16、nt of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.12.4 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
17、Systems and Quality AssuranceDesign/Development, Production, Installation and Service33. Terminology3.1 Definitions: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 ca
18、pacity, 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 close coupled pumps, nin this arrangement, nocoupling is provided between the pump and the motor shafts,and the pump housing is
19、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 transmit the power from thedriver to the pump shaft.3.1.7 gallons per minute (GPM), nU.S. customary unit forcapacity.3.1.8 head
20、, 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 forhead is foot (metre) of liquid.3.1.9 head, total discharge, nthe sum of the pumpsdischarge gauge head, the velocity head at the
21、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 the liquid, imparted to the liquid by thepump, and is the difference between the total discharge headand the total suction head.
22、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 and thegauge centerline.3.1.12 head, maximum rated, nthe most head a pump cangenerate with the correct impeller diameter for t
23、he serviceconditions.3.1.13 hydrostatic test, napplying static pressure 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
24、 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 theservice condition.3.1.16 minimum continuous flow, nthe lowest possibleflow rate at which the pump can run without generatinge
25、xcessive 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 datum, less the absolute vapor pressure of the liquid ata specific capacity.3.1.18 net positive suction head required (NPSHR)
26、, 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.3.1.19 nonmetallic materials, nany material that wouldnot be recognized as a metal. Examples include plastics,fiberglass resins, c
27、arbon fiber, fiberglass-reinforced vinyl ester,polytetrafluoroethylene (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 manufac
28、turer 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 pounds per square inch gauge (PSIG), nthe U.S.customary measure of pressure with zero being adjusted toatmospheric pressure in
29、 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 unit, na typical pump unit consists of aseparate pump and driver, combined pump and driver (closecoupled), coupling, and coupl
30、ing 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 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 vap
31、or 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, nthe resistance of a fluid to shear motion,its internal friction.4. Ordering Information4.1 Fig. 1 and Fig. 2 are provided f
32、or use by the procuringactivity and the OEM. The sections of Fig. 1 and 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 allperformance, operational, and reliabili
33、ty requirements of thepurchaser. The OEM will fill out all sections of Fig. 1 and Fig.4Anti-Friction Bearing Manufacturers Association, Inc., 1101 Connecticut Ave.,N.W., Suite 700, Washington, DC 20036.F998 122FIG. 1 Centrifugal Pump Ordering Data (English)F998 123FIG. 2 Centrifugal Pump Ordering Da
34、ta (Metric)F998 1242 marked “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 guide
35、.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 sh
36、all 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) p
37、ump components where the use of that materialcan 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 require-ments of the intended service and be construct
38、ed 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 least equal to 125 % of pump brake-horsepower a
39、t 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 required at pump-rated condi-tions shall not exce
40、ed the motor nameplate horsepower rating.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 or A995/A995M,Grade C
41、D4MCuN)Bronze(Specification B584, 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)
42、Stainless Steel(Specification 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(Spe
43、cification 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,Grade CF8M or CF8)Ni-Al Bronze(Specification B148, UNS C95500 orC95
44、800)Stainless Steel(Specification A743/A743M,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/B505
45、M or B584)CompositeBCasting Fasteners Corrosion-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, Gr
46、adeB8M and A194/A194M, Grade 8M)Base Structural 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
47、 when choosing allowablematerials.BMaterial property of composites must be suitable for pump service life and intended service.F998 1256.4 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 c
48、apable 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 maintain proper alignmen
49、t, 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 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
