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DESCRIPTION
pump systemTRANSCRIPT
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R e v ir io n :
P tin c ip le s
Flowserve Educational Services
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Pressure can be convertedto head using the followingEquation:
Head is commonly used torepresent the vertical height infeet of static column of liquid
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Head
ffixerGtseDetermining Pressure
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il re s $ il re fr a n v e r$ io n to !{ e a d
Eram tls 1;
Liquid - Water
s.G. - 1.0
Pressure Gauge reading: 40 psig(or 2.76 barg)
S h at is th e ll ead in feet formetres) 1,
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P re s $ fi rfi f o n v a rs io n i* H e a d
Eram rle 1l
Liquid - Gasoline
s.G. - 0.75
Pressure Gauge reading: 80 psig(ar 5.52 barg)
t{ hat is the ll ead in leel (ormetreq ?
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Velocity Head
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t l i+ i: i!1 il *ri]
V e lo c ity h e a d is lh e e n e rg y o f a liq u id a s
sotn e velocityVelocity head is determ ined as follows:
arssullofilsmotionat
V2
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w h e re :
h, = velocity head,ft or m
g = g ravitatio n a l co n s la rl t,ioL,2 f tls2 o r $,8,l m Isr[ : liquid velocity,ftls ot m /s
To determ ine total head being produced by a pu0 p, velocity head
m ust be calculated and added to lhe pressure and elevation heads
hv
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D e te rm in in g V e lo e ity H e a d
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w h e re:h,' velocity head, ll ot m
g = graYitation al constant, 3l,lV' liquid relority,ltls or m ll
Itlsror 9.81 n lsr
rn $ef per .*c+nd Tr_1'- Epnrx [.4fl8
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DetermininE VelocityHead
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Exercise 1AA 1.0-inch nominal diameter schedule 40 pipe (1.049" l.D) has 60 gpmflowing through it. What is the velocity head?
Exercise- 1BA 2-inch nominal diameter schedule 40 pipe (2.A67" l.D) has 400 gpmflowing through it. What is the velocity head?
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in feet per second
in meters per second
gtmx0-408'=Toi*76;;E
mt I hx3.54/ = -'------'------- ol(pipe ID incm)'
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Friction sf Water New $teel Pipe fContinued){Based ." ?it#f
Forrnula}
Extra strong stesl*sch E0Slandard wt $teel '-sch 40
.957" rnside dia1.049" inside dra
CI?3
.053s94r47
SchedLlie 160 $teel
Sl S" inside diaFlowUSgalperrnin
s10
14't6
Headlsss
tt per100 ft
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Pump Head VsSpecifi c Gravity
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Which One is Correct?tl W\ucsJ, %p. * \he-'trol \cr*, r\o^o r.\e .-.oLtrc,rPv-*? I i{r w\$ rq^ lo tLc- 94*g \"""J d"*
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ln a centrilugalpum p,the head devrloped {in feet} il dependerrton thetlelocity ofthe liquid as il enters the im peller eys and as il leaves theim p e lle r p e rip h e ry a n d, th erelo re, is in d ep en d en t o f th e s p ec ific g rav ity o f
th e liq u id
The pr0sstrre head developed {in psior bar} is directly pr0p0rtionalto thes p e c if ic g ra v ity
ll r 115,5
{3 5,2 m
60 psi(4.14 bar)
50 psi(3.45 bar)
35 psi(2.a1barl
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Tip speed is defined as the speed at which the liquidleaves the impeller
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GALTLEOGALTLEI
1564 - 1642 A.D.
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Born in Piso, Itoly.
Fother of liod e?n Science.
Best known for his scientificdiscoveries such as;
fhe low of $nerfis,his invention of the telescope,his ostronornicol obserrrotions,
ond his genius in proving theCopernicon hypothesis.
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PositiveDisplacementPump Curue
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Downward i
pressure is"relieved"
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Centrifugal PumpCharacteristics
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fi*ad " T*trr! h**d {in f**t} d*r.d"tpcd at yr-rir;tt* fl*w rtt*r.
Et$ci*nE " Hffiri*r*rl: rati* *ioutg:utIr*r*epr.r*'er tn irrput h*rse-Fswrr ill lari*ug itr*r.v r*trx,.
S.LF. - F*st clfieirn{,v pcintlp*int where *per*ting hcadr*pru ity c*incirir'x rr,:ith
rn&\rmil$l *ft'ici*ncy.
S"H.A. - ll*r*rpor**r requirrt by thepump firr any fl*rr r*te r:f xliqirir.t i+ith a *p*cifir gravity*f l.f|.
HpSi{R - liet p**itiv* srrctir:n h*ad:en$rgi. rtqnired t$ trt,rrci'lmsl'rictir:n lcs*s fr*m th* pumpsucti*n r:pening t* thoirnp*ll*r vaner.
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Baxic Centriftgal Pump Fer'frirmarj're Curyeri!:
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lmplirutionr sf Running tlff the n"E.P.A$ll t g?l tunr pr f an ;0i to r t o n th e C u rv e 0 .
G,rk 2$$ Alread 1$$)-(e-
APl6l0PttmpsCan jOfi ove on the $trrve0 ,.!
CBack 30% Ahead 20Sb;
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B*st f;fficiency Fnint {B"},.tt }
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Bernouli's Laws onHydraulics
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Bernoullih,i;,'ft,-r
Law #1
The first law af thermodynamics sfafe s that;
Energy cannot be created
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Bernoulli6 Ltw #2
A moving liquid exchanges itskinetic (velocity) energy forpressure
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Bernoulli6 Law #3
Energy in Point 1
Pressure 1
+ Elevation 1
+ Velocity 1
The sum of the three typesany point in a system is theother point in the system
of energy atsame at any
must be equal toEnergy in Point 2:Pressure 2+ Elevation 2+ Velocity 2
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DATUM LINE
Applying Bernoulli's3' d Law
to Pump PerfomanceTesting
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Caleulating Total Dynamic Head
n ll ead
D is c h a rg e
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T D ll ! rio*n\ 4*^r\, \ne'J,
D is c h r rg e ll e l d
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Additional energyadded by pump into
the liquid
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ExerciseCalculating Total
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C a lc u la tin g T D ll
E x a m p le:
D e te rm in e w h a I T D ll is b e in g U e v e lo p e d
the follow ing inlorm alion and assum ptio
.prttn p capacily ol ,l00 U $ gpttt {12,? m
.putn p suclion pre$$ttre teading of 5
.putn p discharge pres$urt reading of
.specific gravity of L0r p tt m p s u c tio n d ia m e te r o f 1 .5 in c h e s
. p u tn p d is c h a rg e d ia m e le t o f I .0 in c h
.discharge presstlre gauge is localedabove the suction pre$sttre grttge
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H - (hrn * h,a * Zo) - (hr, * h,, * z,) + hr
by
ll$;a punt p given
3lhp $ ig
50
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{0 ,3 4 5 b a rg }
p$ig {3,45 barg}
{3 0 ,t m m }
(2 5.{ m m }
'l toot (0 30 m e tre I
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0.q8140.0s5?0,0rgl0.0343tl.BFs
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P rersure G au ge E levalion
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E le Y a tio n H e a d
Suction Elevation llead lhls)The distance from the pumpcenterline to the location of thesuction gauge.
Discharge Eleration Head {hzd}The distance from the pumpcenterline to the location of thedischarge gauge
ldofe. often the gauge is not exactly locatedon the datum centerline, if the gauge is atthe centerline then the elevation head is 0
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E x a m p le :
0 e te rm in e w h a t
developed by a
f o llo w in g in f o rm
a $ s tt rrt p tio n s ;
T0ll is beingpttrn p given the
a tio n r n d
.pttrrr p capacity of 100 |J $ gpm
.plttl p suctiott pressttre readingo f 5 p s ig.putl p discharge pres$ttrere ading of 50 psig.specilic g ravity ol 1,0.putlp ruction diameterof 1,5
in c h e s
.pun p dischlrge diam eter of1 ,0 in c h
.discharge prsrsure gauge is
loe atsd 1 footabove ths suctionp r0 s $ ll re g a tl g e
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H -(ha * h* + Z;) Itu * h* + Z,) + h,
_2.31x pressure, psiPsG
Suction
11.55 ft 115.5 ft
3.86 ft 21.4 ft
0ft lfr
15.4 ft 137.9 ft
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The transit-time ultraEnnrcfl n''''rmeter utiliees th eprnpsgation time of the ultr,lssni*signal in the fluid,
A peir c'f transducer$ fireinstalled on the suter surfece ofthe pipe as Ehaq^rn in thediagram, Each transducer worksalternatively as bnth transmitterand receiver of ultrassnin signals,
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shutoff Maximum deflecti*n cf *.**? in*h*s
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