ASTM_F_998_-_12.pdf

Designation:F99812An 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 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 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 the standard.The values given in parentheses are providedfor information purposes only.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 ApplicationsA194/A194M Specification for Carbon andAlloy Steel Nutsfor Bolts for High Pressure or High Temperature Service,or BothA276 Specification for Stainless Steel Bars and ShapesA494/A494M Specification 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/A890M Specification for Castings,Iron-Chromium-Nickel-MolybdenumCorrosion-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 CastingsB164 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 ApplicationsF468 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: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,150,300,400,600,900,1500 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 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 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 Service31This 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 1,2012.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,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:/www.ansi.org.4Anti-Friction Bearing Manufacturers Association,Inc.,1101 Connecticut Ave.,N.W.,Suite 700,Washington,DC 20036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.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 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 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 andthe motor must use a coupling to transmit the power from thedriver to the pump shaft.3.1.7 g