bfp problems

8/18/2019 Bfp Problems

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PROBLEMS ENCOUNTERED IN BOILER FEED PUMP OPERATIONby

r, Elemer MakaT n e

e ee

ve ev

Elcmr Aakau ivn hs P. D 0the Uiitu of Pwsylva. P tothat he attede the Tehia Uic-sty o Bapest w c cicd hsMaste's Degee chaial Egee-ig Dr Makay has 1okcd :ih B stigs

tube

esg ad d-velopmet ait

DeLaa/ id·sg,

celopt atestig pr/y of

boile ed punps. Sie .70 he hasaIN

as autility pump aiso ad to-

lcshot( the elettlty OJis.

S 1975 he haswe oial \r keepe la jJ! j(!cs j · te utlityCOJics

He s the rst au a;ok 'Su lea PayCoolat P1ps Liht \Fate

ooled caRcaos

adatho

o{sccl

I cal pape o ctg/ p) agad otor dyams tehlogy ld casg thj

ABSRACTAltou mecaical ad draulic sabiliti s i cetr

al pump caued a coderable amout of probl ms r lareNuclear ad Foil Geerati Statio iu cig PowerPlat Availabilit" a relativel limited amout of rearc worka oe i ti area e autor make a attempt to outlie problem i eeral ive defiitio for ydraulic ad damic

Itabilitie outlie te Mecaim tat create temetablie a operati peed ad ow rae r lare

pump ad dicue ow to treat te above ubject we eld ilure ocurred Iteractio betwee draulicall iduced fore ad beari dei parameter ad teir iuece orotor vibratio caracteritic i empaied Frictio iduced partial frequec mode are also dicued ee ce reiable ad ca iuece rotor ad beari dei requiremet ca cae rotor tabilit ad te appearace of te

pump rotor critical peed Compario i made betwee verticall ad oriotall orieted pump ad betwee volute addiffuer tpe e autor alo outlie te miimum itrumetatio ecear to idetif problem area before adaer failure occur ad upport ti wit actual eld failurecae It i outlied ow a imple factor (wite) tet ca

ucover potetial future eld problem Area were tematic futre reearc ad developmet work i ecear are poited out

INTRODCIONA ie of Nuclear ad Foil Power Geerati Statio

row te uexpected ad uexplaied mber of lare pump failure or pumpcaued tem operati dicultie aorow A oe bei to pa cloer attetio to tee probleit becoe clear ta a lare percetae o tee faiure ca betraced to rotor itabiit (t eat i apperace) ocurriepecay i te lo percet ow (or pa oa) reie i

particr i te ecircuatio (ii o) oe

Pump problem a well a pumpcaued feed water tem problem ca be cateoried i te llowi wa

Pump tpe ile or multitae dier or voluteoriotal or vertical etc)

o Vedoro Maucturi QA (Qualit Aurace) ecolo (Hdraulic Lubricatio otorDyamic

etc)

Deig cocept Feed water tem

o Applicatio urbie or motordrive costant or variabl sp d.

e Operatio (cycli or bae load plat) Maiteace ad Service etc

However at ti poit te mot importt objective i to idetif baic caue of failure or operati iculti s) clledGENERIC prolem tat are directl applicable i eeral toall pump product e autor a bee ad i coducti afailur urve ad ilure evaluatio for te U S Utilitie outilit pump applicaions wit pecial empai o boiler feedad reactor feed pump e urve ti r a allowed u toideti everal tpical problem area Some of tee are

e Pump draulic itabilit (ee Fiure 1

Beari tecolo ad rotordamice Seal (epeciall for Nucear Primr Coolat Pup)o Axial balaci devie balace drum ad dik)e Artiiall pued pump ecieciee Lack of Stdard r preure pulatio amplitude ad

frequecie allowable vibratio level at variou frequecie pump a axil vibratio level ad freuecie

'

.

50

7

'

Figure 1. Head-Capacity Curve of a._Hydralically Unstable

M

ul ti-Stag

Boiler Feed Pump Parallel operation is fcultat

lower fows. Head is unstable below approximately 65 percentfow resulting in vaous pump or F. W. system ma

lfuncti nin

g.

olm cus y impll sig.


2/10


3/10

PROBEMS ENCOUNTERED IN BOILER FEED PUMP OPERTION 4

� 9 •

2

BLE SSIN FEQUENY S ELY DOMINT

MY EXCITE LOE FEQUEN SONSES1···

8 w § � ;· - T �;D DFF. '

U

N

T

IO

N

TYPES. MINIMIZED IN ONE CAE WTH TLTPA , u r OF

O�

NOTHER WIT WER-RING DES. RUBING CA U D

�;._ _�1y: ·- � OLY WITH UNSTABLE BE RINGS


4/10

4 PROCEEDINGS OF THE FIFTH TURBOMACHINERY SYMPOSIUM

PM SAGE GEOERMot pump deier like to ave a claicatio of pump

problem pum eometr rater ta b ow mecaimor oter claicatio Aai wt te aid of Fiure 6 ad 7

we ca cateorie our objecive b pump tae eometr uca

• Impeller e (ilt) itabilt

• Ipeller dicare ilit• Iteral itabilit (impler ad/r dier)• Exteral itabilit (ap beind impeler ub ad roud

uuua important for igle tae doube uctio reactor feed pump)

• earri iteractio• Cai iteractio• Hdrodamic wirl (we rotor motio et i pical

motio of te rotor ive re to additioal draulic actio)

Hdraulic itabilit ca be detected b examii te pump Headapacit curve (ee Fiure 1) If te curve i attoward lower ow or epeciall if it i droop" mot likel pump or tem vibratio wll be a problem Ma time te problem coe om e fat tat arctectegieer are pu-i for ier ta poble eiec tat ca be acieed olb deii te pup draulic compoet for te uaatee

poit aloe i te reult i utable operatio at lowerow I mot cae ol a ew carell died pump impel-ler ca olve te problm we draulic itabilit preetIf a pump i purcaed but ot yet deivered iit o a oodop tet wi owwie equall ace tet poit If a poit iier i te idcapacitie ta eibori poit o otaccept it iit n reteti If t i a ew propal prper writte ad executed pecicatio ca take care of ti pe-omeo o pecicatio do t pre ti ubject ardeou Hdrauic itabilit i te umber oe Outae pro-duci pomeo due to te fac tat te vibratio re-poe receive edle eer exciti iput from tall blade

paig ad oter ource

PUP E FFCENCArticall iated i ciecie are "cs b ma

rt ee Refrece 11 62 rt pararap) ive a lear explaatio of ti peo Atull eciec doeo e o e red to oba od pump reliabilit owever a demad for ueaal i eciec ill reult iowered mcie reliai

FER VERSVOLUT YP

i queti come up eut i power ttio

i oe d you rme? reay eed o te idi vidal deer' bilt w rage ecienc ad tabilit

Formatio o tabilit i t ier pae trg

deped on e eeerati rae f te uid ow diuerdeerae te ow terf it i e recepie to parato ad tall formain ece to pat lad iailit O teotr a te d a volt te ow uuall i duped itote icare oe wc e cae otr prbl idue to t ct tt te acuated ec o te ble oltetue d dier blade pai euecie aect t coo em epecily r a ii ae ractor tem wree rt tr ee cotrl i e it

L

Ale tecolo r a dei i mial r ipd piatio or a otr a l bd

bui) type eal Alo for te more complex eal typecotiuu killed attetio i eeded at te ite ic ofte iot availale Labrt el are te leat deadig orkore of utility pup I n order to avoid ture dipute iito avi labyrit eal e ol reao for oter eal tpe(mecaical cotrolled leakae etc ) i to bri drulic lo- (leae) dow o te apparet eiciecy of te macielook ood ad uarateed commitmet ca be acieved

BALNCING DEICES

Axial balace dk device are equet caue of failureFrom tecology poit of view te belog to te ae cate-gor as eal Setime lack of pace available i a de

prevet pplcatio of proper dimeio wic make tedevice receptive to pump itera pump draulic itabilitat lower ow damic unbalace of copoet beari i-tability cti iduced a wirl etc) or exteral excita-tio reultg i ueceary failure You ma ear from te vedor tat te dik i te at valve o te pump amely it\V il bere ay oter compoet i te pump i ot oA properly deiged dik ca lat forever ad ca ave te pup om detructin

BEARNGS, ROOR DNAICS, OL WHP,

FRCION INCE WHIRL

If a prble i traced to a beari deig or eari tpecaed deciec electio of proper bear parameter (LDrti radial earce bearig load pri ad dampi coef-

ciet etc ) il i ma cae reult i a ucce olutioI a ew acine it n performg te proper rotor-damic aai critcl peed a decto rotor re-poe ear tabi) t peed ra of appcatio adto veri te reult durig acceptace tet A ood coa dowtet for examle ca ver te locaton f crtcal peed If te

pump maximum perati peed i above 15 tme te rtlateral crtcal peed nt r te pup wt taletpe joural beari e lat pae of Referece 4 outlne

tFiure 8 (alo Referece 4) ow i a overimpied

mer te ect of te beari prcipal prig coeciento rtor critical peed I eera it i recommeded for exi-ble a to ppl dyamicaly table beari uc a tilt-

pad tpe wic are eretl table i teor A rotor illed rid it erate low te rt critical peed abovetat it i called exible e autor d occaioall te bear

DC nc iu 8. ffcs of icpl Spg Cocs Roo i Sp l F ump Tu D ous ig Tps u f pump coc a fexibe copling, the ccl sp rpe- ui y


5/10

POBLEMS ENCOUNTEED IN BOILE FEED PUMP OPEATION 9

ng nstblty ses wth hgh speed pumps wth tltngpdberngs Fgure 9 shows one suh se where the multstgeboler feed pump suddenly beomes unstble t twe the rstrtl speed The equeny of nstblty ws lssl berehngng to tltngpd berng. The new berng elmntedthe lssl hlfequeny whrl, but not t the low frequenys shown n Fgure 9 The nstblty sets n only t ertn

pump ow ondtons nd only bove twe the rst rtl

speedFgure 10 from Referene 6) shows the behvor of

snglestge double suton nuer retor e pump Theorgnl pplton of these pump types ws low speed boost-er 1800 RPM) Eonoml resons dtted speedp to

3600 PM for the booster, nd to bove 5000 RPM for thenuler feed pump ppltons Hgh speed booster pumpsehbted more thn usul eld problems but mnly t lowows, espelly when mnmum ow rerulton) ws set toless thn 25% pump desgn ow Most ses were looked upons system desgn problems, espelly ppng geometry Sgnf-nt mount of money ws spent on ppng hnges ·th verylttle suess. Wth onstnt speed retor ed pumps Fgure10 shows one t 5400 RPM) we found serous problems sshown n Fgure 10, ses " to d" In se d" the pump

beme unstble n the low ow re t 3600 RPM. At 4000RPM the only remnng stble pont ws the desgn pont, ndthe pump ws unble to operte bove 4000 RPM n ny owrnge Redesgned berngs llowed the pump to operte nthe rnge shown by lne " Prtl orretons to the hydrulomponents resulted n lne b" whle " ould be hevedonly by omplete redesgn of the pump nternls. Present U.S.

i

oV

PT PMT T PMFgue 9 Vbaton Fequency - v - Spee Caue ancue o common vbaton pobem o centuga pumpteam & ga turbine fan & blower compreor and otherceniugal equipmet.

prte s to pply vre spee re I te rve s neletr motor the SynhroP" whh hs hydrl oupl-ng wth bultn stepup ger) s most eonoml rrnge-ment. Constnt speed retor feed pumps n be found n theU.S only n smller nd older nler unts nd wth unfvor-ble eperene.

Fgure 11 shows sh vbrton mpltudes t vrous frequen-es for se d" of Fgure 10 when the pump ws opertng tthe nstblty lmt lne. Drvng the pump nto the nstbleregme by ny smll mount resulted n rpd nrese of thehlfequeny omponent In two nstnes the mntennerew lerned tht, f suh vbrton sets n, t wll ompletelydestroy the pump rotor Applton of tltngpd berngs ddnot ompletely solve the problem, howeer sudden destru-ton of the rotor dd not our gn.

w

i 10 Pum Hadlo haati a 54 RP M

RiOfl?UM:

S!NGLTACE

tJ

DIKZ.· . PTNG P£ ·N " 5 , M

O VUl N - N SFgue 11 yucay Inuce Intabity Become SongEnough to Detabize the Outboa Beang ch Then Deveop aFequency Wh ( /2) I beang i tabe t cantill develop an apparen haunc hirl hn rotor rbbing occr but the uecy i nction of% pump o.


6/10

PROCEEDINGS OF THE FIFTH TURBOMCHINERY SYMPOSIUM

Fgure 9 the Sunburst" chrt) s n eperence chrtnd cn be used to dgnose cses where the vbrton frequen-ces cn be determned If vbrton mpltudes pper wth

equences lower thn the opertng speed, the nstructon Fgure 9 s: Use tltngpd berngs" In generl, they brnghelp n such cses, but one should relze tht berngs ccope \th hydrulc forces only up to some degree; beyondtht, the soluton les n the desgn of the pump hydrulc

compenents Hydrul forces, such s wke ect t blde pssng frequency, or rdl forces nduced by mpeller to d-ser/volute ntercton, cn be strong enough to ecte therotor to lrge mpltudes If ths s coupled wth dynmc un-blnce of the rotor, rubbng t close clernce surces myoccur tht cn nduce counterrottonl whrl wth fre-quency less thn rottonl Ths s selfectng type vbr-ton, d f unbounded, wll grdully or sometmes volentlgrow d destruct the rotor double frequecy componentmy lso pper, gvng the ndcton of mslgnment, sshown n Fgure 11 Counterrottonl equecy vbrtosre unpredctble The lowest equency the uthor mesured

ws 008 rottonl speed, nd the hghest 0 5 rottonlspeed For rble speed mchnes ths frequency s nc-ton of ow nd speed, whle for constnt speed boler feed

pump t s ncton of pump ow lone The whrl equencyrton usully ncreses wth ncresng pump ow, s show Fgure 9

RAIAL RALIC FORCES

Refereces 10 d 13 dscuss the subject n gret detlsOne must dstgush betwee sttc nd dynmc rces bothncresng mgtude towrd lower ws, hvng mmum t mnmum recrculton) ow Unrtuntely thngles of the sttc forces, nd the frequeces of the dynmcrces cot be clculted they hve to be mesured for echndvdul cse More mportnt, ech desgn hs ts own pt-te Results cnot just be etrpolted om one desg tonother Ths s one re where ture work s essentl

SANARS

Wht re vbrton nd pressure pulston lmts wht sgood, wht s cceptble, etc re frequent questons wth hghenergy nput pumps power sttons For ll cses serch for mpltudes contnuously goes on, but t s most m-

portnt to nd the ssocted FREQUENCIES We re usu-lly lookng for:

Dynmc blncng mnmums brton of the

Rotor n the Radl drecton Axal ecto

Structure Ppng

Pressure pulston n the Ppng Pump nternls

Sfe opertng rnges, such s Speeds Mmum nd sometmes lso mnmum) Flows, epeclly mnmum recrculton) Pressures, tempertures, etc

NAIC BALANCING

The US Nvy specctons for llowble dynmc un-blnce qunttes re cler, precse nd dequte for ny

pump pplctons

6 2 40. 6 - (

2

Fgur 12 Aoab Roor Vbaon Lv for CngaMahnr Maud Rav o h Barng Ca (Exmna andar)

IBRAION

Rotor synchronous vbrton mpltude levels re shownn Fgure 12 s mesured on the sh reltve to the bernghousng The mpltudes rer to only snchronous speed fre-queces once per rotor revoluton) Fgure 9 shows equen-ces nd some smpled eplntons or ther cuses ndcures

l vbrton level s n ecellent ndcton of pumpdesgn qulty for sngle stge double sucton pumps, such sbooster, nd nucler ed pumps It cn be used to detecthydrulc nstblty, nd cn be used to nd sfe mnum ows Recrculton ows) There re no estblshed stndrdsmong mnufcturers or users Fgure 13 s n emple, whleFgure 14 shows method how vbrton dt ws used toset mnmum ow qunttes n severl nucler unts

How to mesure mpltudes nd equences s even moremportnt Fgures 15 nd 16 om Reference 4 show howmsledng ncorrectly mesured dt cn be, whle Fgure 1shows how correctly nstrumented mchne ws sved omdestructon

PRESSRE PLSAION

There re o pressure pulston stndrds vlble t pre-sent Oten 3% mmum o the pump produced hed me-sured on te dschge sde) s quoted, whch s stscto nsome cses Recenly nlyzed cses reveled tht vendors l-most lws uote mptdes t the Vne pssng" frequencynumber ofmpeller nes Z" tes rotonl speed N," eZ X N) re 3 sows scat ampltudes at Z X N btthe sae ata rece aetc tape a plae ac at alower speed shows tht the mpltude t vnepssng fre-quency s ndeed sgncnt Fure 20 shows dt collected onnucler feed pumps n nstlltons wth pump nd system d


7/10

PROBEMS ENCOUNTERE IN BOIER FEE PUMP OPERATION 5

"

§�

�.

I..

3 0.

Fgure 13 PeakToPeak Preure Pulaton ( M Meaured nthe Dchae Nozzle and Rotor Aal Vbraton (!) a HghSee ec ee Pm Wi wo D e mel is

cge Cgris Pm Effciecy 00 Pce wWs e Sme i Cses 90 %

l D ClC

l f

I

1 1 1

1 r

·

'

ll

1

:

�. ; !

_

:

_ : / j

{b) RECIRC IHCREE BY %

t f t J I{c) A REClC % IER RIGIHA

igure 4. Shaf xil Vibraion of High Seed, ingle

Sge, Double Suctin Nclear eed Pum at Minimum lowOperain. Direcly alcable o any ngle age double suc-tion cenrifga pum, uch a connae, boer, or anychemicl roe um.

cultes recommended Sfe lmt lne" s lso shown mesured n the pump schrge Ths lmt lne s contnuouslysubject to revson s more dt s collected In Fgure 5 wemke n ttempt to epln equences nd mntudes ofhydrulclly nduced dynmc forces wthn the pump

Fgure 2 shows equency plot wth the d of n RTRel Tme nlyer) of nucler rector feed ump The me

OSO OU W WO O U AYZER ?: X 1Fgure 5 Orbit hape at the Turbine Inboard BearngBler ed pump and turbne rve coupled ae ): Brehot algnment ith large bearng clearance Cae (2): After hotalgnment beang clearance reuced b 4 m on the iame-ter Both at the turbine rotor rt ctical peed Notice thatone vecal probe ould not h an change in bearng be-havior One probe 20° of vertcal pitn would ho theoppoe ct probe perpendicuar to each other cil-locope an equenc anazer give clear pcture.

1\OSCOSCOPE OUTPUT WTH O PBES

FQ CPSFQ ANYER 0 X1Y1

Fgure 16 oiler Feed Pump Uncoupled Fr the TurbneDrve Orbt hape at the turbne inboard beang at he rtcrtca peed. The vbraton reading n the contrl roomhowed 14 ml wle the tre ampltude 46 mMeaurng vbraton level of a hgh peed rotatng machne ina ngle drecto can

b not onl mleadng but al dangero.

NO. CRTC Xpd rimila

1 700 145 3100 F 43 40 3 5,000 385 5050 4 5,100 47 3100 FRT N7

Fgure 17 Shaft Orbt Meaured at the Turbne InboardBeang at Vaou See on jne 5 175 Dratc ncreae ofmplitude conclued the tetng Vbration became volent atthe r crtcal peed dng coaton

surements were tken t the pump dschrge The mpltudet the equency of N/4 N=rottonl speed) s very stronglso hgh mpltude ws epeenced t bout one CS whch cn nuence the feed wter ppng control vlve control system rector wter level nd the rector control systems sho n Fgure The pulston wth the lo frequencycn be domntng respone Its uence on the controlsystem nd the stem turbne tself cn be so strong tht tmy force the turbne nto hh ld oscllton wth hev

vbrton of the whole stem cycle In one rtculr cse whencntrol ws ut on Mnul erton bece nrlrvng tht t ws cuse by the contrl syste whch be


8/10

5 POCEEDINGS O THE ITH TUBOMCHINEY SYMPOSIM

Figure 18; Typical Pressure Pusation Magnitudes in Large

Nuclear Reactor (and Steam Generator) Fee Pumps AvageTDH head) generated by the pump is 200 ft

came eced by the pressre plsato geerated by thereactor feed pmp proe by measred data see Fgre 2 to 5ad 18)

Fgre 3 s a typcal example Pressre plsato measremets the reactor feed pmp dscharge ppe dcateoly" low eqecy N/4) plsatos of hgh ampltdes, gg a clea bll of health to the pmps, pttg the blame othe ppg system Fgre 4, howeer, shows that the rcgcto, resposble for the lower eqecy ampltdes deed, s the blade passg freqecy

To aswer addtoal qestos, sch as what are the e

qeces d the ampltdes sde the dret parts of the feed pmps, ad, becase oe partclar case the abovemetoed eqecy story reslted too mch otage of several large clear statos, sch measremets are ow taeAll of them show moderate ampltdes at blade passg eqecy, howeer, aalyses, smlar to that show Fgre 4,showed that balde passg freqecy was the real case of thesystem problem edesg of the pmp mpeller wth deretmber of blades, bt more mportat, wth ery carefllyselected mpeller desg parameters, fally elmated the ds

pted problem

It was obsered may tmes by the athor that theampltdes at blade passg eqeces Z X N) ar e steady matdes forcg fco), whle at lower eqeces they

form, dsappear ad reform aga excted system resposes)

Fgre s a smled smmary of freqetly obsered ydralcally dced freqecy responses measred o the pp ad o the feed water ppg Sbsychroos forcesca be detrmetal, resltg smlar erace to Ol, oe msleadg the estgtor Oe sold dstsh etwee olwhp, rbbgdced whrl, ad hydrlclly dced whrl Ofte these three ppear alke, adca e toard flse coclsos he reqency ools depedet of pmp ow, whle hyrlc stablty s acto of both, speed ad ow

How c we ow represet the above metoed statcad dyamc forces whe performng rotordyacs clcltos The sttc forces ca be represeted smlarly to be

0

!;

u 8g0 6z" ·"

2

00

Ns inEuropeanunt

700

600

0

00

300

200

100

HYDRAULCALYNSTABEEGIM

Ieacto sem enerato)fee boler ee boostecondensate, heater drapmps

Pump flow, % of aed10(

igur 19 Antiipatd Usful Oprating Rangs for Pups n Lar r n Foss nt

gs, seals, d wearrgs, ael wth sprg ad dampgcoecets Sychroos rces ca be represeted as dynamcbalace Other tha sychroos 1 Re) ad sttc forcesca be represeted oly whe sg osychroos, or oler compter programs

SAFE OPENG RNGES

Here we cocetrate �the sbject of pp Mmm" ow, ofte rerred to as Recrclato," or smply Recrc" ow Fgre 19 shows ow lmts for vros pptypes ad applcatos Becase of kee competto the pmp market, edor prces, pp ecences, etc all ll wth a arrow rage Coseqetly, the oly attractve BUT ARTIFICAL des hhlght a marketg ma caexplot s mmm ow For example, stead of arateeg25% recrlato ow, a vedor mht promse oly 5 to 10%The the ecrclato le d ts cotro valve c be redced sze o, say 8 ches to 4 ches, ad he ca oer a savg the oerll prce of the feed wter system ppg Ths seemsattracte tally, especally to the rchtect eeer, bt ot whe yo cosder the extsve pmp dmge tht reslted om lo recclato w The desg marg bad Fgre

19 represets a regme whch the experece ad assmptons of the pmp desger ome to play Safe mm ow for a large rector feed pp s NOT LESS" thn 25% ofdesg ow, bt may be as gh as 45% whch s ot acceptabled the p peller desgn s to be exed nd mproedsee Fgre 13 as a exaple

Other qttes sch s mxmm ow veloctes, osad speeds are well dscssed Referece 1 hece ot dscssed here Other staards and easrg des are otled Referece 4 There are my other mortat stadrds for cetrgal pmps, one of them s the radal gapbetween peller O and ser/volte tonge nsdedmeter Te closer the ap s te her the ececy


9/10

PROBLEMS ENCOUNTERED IN BILER FEED PUMP OPETION 5

Figre 20 Char Efficiency vs Specific Spee N,

as a Fncion Capaciy QGPM

s however, beyond cert lmt the pressure pulsto,cused by blde pssng pheomeo, becomes srog eougto destroy pump compoets, but more mportt, the whole

pump tself. For dser pump the gp must ot be ess th 3% of the mpeller O.D., for volute type pump the stdrd sot to be less th 5%.

WHA CAN FACORY ES ELL ABOUFURE PROBLES

Fgure 20 s gudele for wht the epected pumpececy levels my be. Fgre shows emple of troublesome pump hed curve shpe. If the hed curve sdroopy or t towrd decresg ows, or f t hs KINK" t, the pump should ot be ccepted, becuse, pump, ppg,cotrol vlve cotrol system ml ctog my low theture. Aze ALL pressre pulsto rges, do ot ceptresults just t the blde pssg equecy. Alwys sk for pro per strumetto t the bergs see Fgures 5 d 6) d for results t wde equecy rge, ot oly t opertgspeed see Fgure ). If pump hs blcedsk devce wys sk for the dsk leko ow the complete opertgrge of the pump, s show Fgure 2.

REFERENCES

. Mky, E. d Ewers, B., Hydrulc Problems Nuler Feed Pumps Demd Attento to Cut CostlyDowntme," Power Mrch 975.

2. Mky, E., Choose Feedpumps Crell for CetrlStto Servce," Power Generation Planbook 974.

3. Mky, E. d Sez, Jose Hghpressure Boler Fee�Pump Troubles Cler Up Aer BlcgDsk Chges

Power Jue 974.

4. Mk, E. d Doersberger, J., Alyzg d Corretg Vbrto Problems Rottg Equpmt: ACse Hstor," Power Otober 975.

5. Mky, E., Adms, M. L. nd Shpro, W., Desg dProcremet Gude for Prmry Coolnt Pumps Used

OJ·l

-

.

.

�

-

J 5 50 70 L L

Figure 21 How oiler Feed Pu Failure a Interetedand Degradation the Pu Followed ith ile In-trumentation at an 800 M Unit If um imeller headharateti wa table mot likel none of the ilure wouldhave ourred

LghtWter Cooled Nucer Rectors Hdbook prted by O k Rdge Ntol Lbortory, November972.

6. Mky, E. d Drechsler, G. E., Trobleshootg LrgePumps for Nucler nd Fossl Sttons," Power December973.

7. Mk, E., Improve Power Plt Avlblty: LrgePump Problems," ERI Prect Report 64, October 20,975

8 Mky, E., Idetcto of Boler Feed Pump Problem Lrge New Power Geertg Stto," EPRI ProjectReprot 64, Mrch 976.

9. Krssk, Igor J. d Vletn, J. E. C. Stem PowerPlt Clcs: Boler Feed Pump Drves for Lrge StemElectrc Sttos," obution Februr to November966.

0. Flocc, D., Hydrulc Problems the Developmentof Rector Pumps," KSB Spel Prtng, No. 2, Sep-tember 974.

. Mky, E., Elmtg Pump Stblty Problems, Power July 970

2. Mky, E., Dscusson o Clculto of Fored hrl-g d Stblty of Cetrgl Pump Rotor Systems," byH. F. Blk, Trstos of the ASME, Augst 974.

3. Mky, E., U.S. Prtce o Boler Feed, Ncler Feed,nd Other Utlty Pump Applctons Cuses nd Cures of

Feld Flures, Synhrotorque Symposum, Munch,Mrch 25, 976.


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54 PROCEEDINGS OF THE FIFTH TURBOMACHINERY SYMPOSIUM

bfp problems

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