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Is this content inappropriate? Report this Document. Description: API 3rd Edition. We hope you can find something helpful by offering you much more options. Free access for api 3rd edition download to read online or download to your computer. Read these extensive report and overview by simply following the URL above Free access for api 3rd edition free to read online or download to your computer. Free access for api 3rd edition full to read online or download to your computer.
Free access for api 3rd edition pdf to read online or download to your computer. Note: If the seal is exposed to suction pressure, special consideration may also be necessaryforlowsuctionpressureconditionsorwhenapumpissubjectedtoaNPSHtest requirement.
Thefollowingitemsshallbeprovidedintheproposal: a category b type c arrangementandgeometry d materialsofconstruction e referencelist. Thecomponentsshallalsowithstandthemaximumdischarge pressureexceptinhighdischargepressureservicewherethisrequirementisimpractical. For such applications, the vendor shall advise the purchaser of the maximum sealing pressureandthemaximumdynamicandstaticpressureratingsoftheseal.
Seal facesandgasketsshallbecodedinaccordancewithTablesF1andF2 2. It shall have sufficient rigidity to avoid any distortion that would impair seal operation, including distortionthatmayoccurduringtighteningoftheboltstosetgasketing.
Ifthisisnotpossibledueto space limitations, a suitable means of detecting and controlling the leakage shall be provided. Unlessotherwisespecified,aspacercoupling,withaspacerofthenextstandardlength longerthanthesealshallbeprovidedbythesupplier.
Itshallhavesufficientrigidityto avoidanydistortionthatwouldimpairsealoperation,includingdistortionthatmayoccur duringtighteningofthebolts. Thegasketshallbeofthecontrolled compression type oring or spiralwound gasket with metal to metal gland to seal chamber contact. If space or design parameters make this requirement impractical, an alternativesealglanddesignshallbesubmittedtothepurchaserforapproval. Symbols shall be in accordance with those specified in API.
If the purchaser provides an external source of seal flushing, the pump vendor shall specify the flow, pressure, temperature, and required lubricating properties of the flushingmedium. Ifarestrictionorificeisused,itshallnotbelessthan3mm 18inch in diameter. Thesedevicestypicallyincludedoubleortandem mechanical seals, auxiliary stuffing boxes, or secondary seals. The purchaser and the vendorshallmutuallyagreeonthemanneroflubricatingthesedevices. If a seal gland utilizes a common design with multiple ports for symmetrical installation on multiple shaft pumps right and left , the ports shall be appropriatelyidentified.
Allowanceforcoolingflowmustbemade whendeterminingthepumpcapacitytomeetdeliveredflowrequirements. Ifarestrictionorificeisused,itshallnotbelessthan3mm 18 inch indiameter. Heating requirements shall be agreed upon by the purchaser, pump manufacturer, and seal manufacturer.
If seals require final adjustment or installation in the field, a metal tag shall be attached warning of this requirement. The stuffingboxesshallpreferablyaccommodatefiveringsofpackingplusalanternring. The minimum packing size permitted shall be 6mm 14 inch square. The packing size shall preferablybeaminimumof9mm 38inch square.
Connectionstothelanternringshallbe aminimumofNPS Note:Thisinformationisrequiredtodeterminetherateofbarrierorbuffersealoilusage andthusthesizingofthesealoilreservoir. Note: The rated life is the number of hours at rated bearing load and speed that 90 percent of the group of identical bearings will complete or exceed before the first evidenceoffailure.
Itisrecognizedthatthislifemaynotbeachievedwherebearingsare operatedinfluidsotherthancleanlubricatingoil. Singleordoublerow bearingsshallbeoftheConradtype nofillingslots. Such housings for oillubricated bearings shall contain a drain at the low pointandshallbeequippedwithanoillevelgauge. Itisrecognizedthatthislifemaynotbeachievedwherebearingsareoperatedinfluids otherthancleanlubricatingoil. Note2:IntwinscrewMPPs,thebearingsmustbesizedandselectedtomanagethefull radialloadappliedtotheshaft,sincehydrodynamicfluidfilmsupportbetweentherotor andlinermaynotbeavailable.
Specialattentionshouldalsobegiventominimumloading conditionstoensurethatbearingskiddingdoesnotoccur. Singleordoublerow bearingsshallnotbesuppliedwithfillingslots. Note 1: Greater internal clearance may reduce the temperature rise of the lubricant. Bearingcarriersareacceptable onlywithcustomerapproval.
Note:Thisparagraphappliestoallrollingelementbearings,includingbothballandroller types. For certain roller bearings, such as cylindrical roller types with separable races, bearinghousingdiametralclearancemaynotbeappropriate. Duringshoptesting,thesumpoiltemperatureriseshallnotexceed 40k R and ifbearingtemperaturesensorsaresupplied outerringtemperatureshall notexceedC F. NOTE Pump equipped with ringoiled or splash lubrication system might reach temperaturestabilizationduringperformancetestofshortduration.
Asightglassgaugeoroilleveldipstick shallbeprovided. For such a lubrication system, datasheets shouldbesupplied. See 3. The metallurgy of all major componentsshallbeclearlystatedinthevendorsproposal. When no such designation is available, the vendors material specification, giving physical properties, chemicalcomposition,andtestrequirements,shallbeincludedintheproposal.
Suchtestsand inspections shall be listed in the proposal. The purchaser may consider specifying additionaltestsandinspections,especiallyformaterialsusedincriticalcomponents. Materials shall be identified by reference to applicable internationalstandards,includingthematerialgrade. Ifnosuchdesignationisavailable, thevendorsmaterialspecification,givingphysicalproperties,chemicalcomposition,and testrequirementsshallbeincludedintheproposal.
Warning:Certaincorrosivefluidsincontactwithcopperalloyshavebeenknowntoform explosivecompounds. Note:Thepurchasermayspecifyadditionaloptionaltestsandinspections,especiallyfor materialsusedforcriticalcomponentsorincriticalservices. Also,torque loadingvalueswillbeconsiderablydifferentwithandwithoutantiseizurecompound. Ferrous materials not covered by NACE MR shall be limited to a yield strength not exceeding bar 90,psi andahardnessnotexceedingRockwellC Note: Typical agents of concern are hydrogen sulfide, amines, chlorides, bromides, iodides,cyanides,fluorides,naphthenicacidandpolythionicacid.
Otheragentsaffecting elastomer selection include ketones, ethylene oxide, sodium hydroxide, methanol, benzeneandsolvents. Unless otherwise specified, piping nipples,auxiliarypipingcomponents,andboltingareexcludedfromthisrequirement.
Note: The torque loading values to achieve the necessary preload are likely to vary considerablydependinguponwhetherornotanantiseizurecompoundisused. Note:ItistheresponsibilityofthepurchasertodeterminetheamountofH2Sthatmaybe present, considering normal operation, startup, shutdown, idle standby, upsets, or unusual operating conditions such as catalyst regeneration. Whentherearetracequantities ofH2SknowntobepresentorifthereisanyuncertaintyabouttheamountofH2Sthat may be present,the purchaser should automaticallynote on the datasheets thatNACE materialsarerequired.
Components that are fabricated by welding shall be stress relieved, if required, so that both the welds and the heataffected zones meet the yield strength and hardness requirements. Lowcarbon steels can be notch sensitive and susceptible to brittle fracture at ambient or low temperatures. Therefore, onlyfullykilled,normalizedsteelsmadetofinegrainpracticeareacceptable. The manufacturers data report forms,asspecifiedinthecode,arenotrequired.
NOTE:Inmanyapplications,smallamountsofwetH2Saresufficienttorequirematerials resistant to sulfide stresscorrosion cracking. If there are trace quantities of wet H2S knowntobepresentorifthereisanyuncertaintyabouttheamountofwetH2Sthatmay bepresent,thepurchasershouldconsiderspecifyingthatreducedhardnessmaterialsare required.
Components that are fabricatedbyweldingshallbepostweldheattreated,ifrequired,sothatboththewelds andtheheataffectedzonesmeettheyieldstrengthandhardnessrequirements.
Ifsuchconditionscannotbeavoided,thepurchaserandthevendor shallagreeonthematerialselectionandanyotherprecautionsnecessary. That can result in serious corrosion of the less noble material. Only fully killed or normalized steels made to fine grain practice shall be used. Orings shall be selected and their application limited in accordance with ISO Oring materials shall be compatible with all specifiedservices.
SpecialconsiderationshallbegiventotheselectionofOringsforhigh pressure services to ensure that they will not be damaged upon rapid Depressurization explosivedecompression. Itshallbespecifiedonthedatasheetiftheserviceissuchthat thereisariskofrapiddepressurization. Note2:SusceptibilitytoexplosivedecompressiondependsonthegastowhichtheOring is exposed, the compounding of the elastomer, temperature of exposure, the rate of decompression,andthenumberofcycles.
Porosityshallnotexceedthelimitsstatedin thematerialinspectionacceptancecriteria 4. Surfacesofcastingsshallbecleanedbysandblasting,shotblasting,chemicalcleaning,or any other standard method. Moldparting fins and remains of gates and risers shall be chipped,filed,orgroundflush. Thechaplets shall be clean and corrosion free plating permitted and of a composition compatible withthecasting. The holes drilled for plugs shall be carefully examined,usingliquidpenetrant,toensurethatalldefectivematerialhasbeenremoved.
AllrepairsthatarenotcoveredbyASTMspecificationsshallbesubjecttothepurchasers approval. Moldparting fins and the remains of gates and risers shall be chipped, filed or ground flush.
Ifchaplets are necessary, they shall be clean and corrosion free plating is permitted and of a compositioncompatiblewiththecasting. Weld repairs shall be inspected according to the same quality standard used to inspectthecasting.
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