centrifugal pump - a process review.ppt

7/25/2019 Centrifugal Pump - A Process Review.ppt

1/23

1

CENTRIFUGAL PUMPS

ByAndreas Chandra

A Process ReviewA Process Review


2/23

2

Table Of Content

CLASSIFICATION OF PUMPS

DEFINITION OF CENTRIFUGAL PUMP

IMPORTANT PARAMETERS WHILE SELECTING A PUMP

TYPICAL PUMP CHARACTERISTIC CURVE

STARTING OF PUMPS CAPACITY REGULATION

MULTIPLE PUMPS INSTALLATION


3/23

3

S i n g l e / T w o S t a g e

M u l t i t a g e

! o " i # o n t a l

S u $ % P u $ %

T u " b i n e T & % e

' a " " e l P u $ %

( e " t i ) a l

M e * i u $ t o l a " g e f l o w

L o w t o $ e * i u $ % " e u " e

( i ) o i t & + 2 , , C t

- & n a $ i ) . C e n t " i f u g a l

S ) " e w

G e a "

L i 0 u i * R i n g

R o t a " &

M e t e " i n g

P i t o n / P l u n g e "

R e ) i % " o ) a t i n g

L o w t o $ e * i u $ f l o w

P " e u " e n o l i $ i t a t i o n

P o i t i 1 e - i % l a ) e $ e n t

P U M P S

CLASSIFICATION OF PUMPS


4/23

PUMP SELECTION C!ART


5/23

DYNAMIC PUMP :DYNAMIC PUMP :

The energy is continuously added to the Puming li!uid toThe energy is continuously added to the Puming li!uid to

increase the "uid velocities# $u%se!uently the velocities areincrease the "uid velocities# $u%se!uently the velocities are

converted into ressures in the Casing and No&&le area#converted into ressures in the Casing and No&&le area#

-EFINITION OF CENTRIFUGAL PUMP


6/23

4

PUMP PERFORMANCE CUR(ES


7/23

5

IMPORTANT PARAMETERS WHILE SELECTING A PUMP

Caa!"#y $%"n&n'r&ra#ed(

D"))eren#"a* head

S+!#"'n ress $n'r & %a,(

D"s!har-e ress+re

NPSHA

P+%"n- #e%era#+re Va'r ress+re. Se!")"! -ra/"#y. V"s!'s"#y. C'n-ea*"n- #e%era#+re

C'rr's"/e & #',"! & er's"/e na#+re


8/23

6

Caa!"#y ') a +%"n- "ns#a**a#"'n !ann'# 0e de#er%"ned "#h'+# ana!!+ra#e de#er%"na#"'n ') #he head re2+"re%en#s ') #he sys#e%3 Th"s "sde#er%"ned 0y sys#e% 4 head !+r/e3 Sys#e% head !+r/e "s #he -rah"!a**'# ') #'#a* s#a#"! head and )r"!#"'n *'sses )'r /ar"'+s )*' ra#es3 S#a#"!head "s d+e #' e*e/a#"'n 'r ress+re d"))eren!es3

-iffe"ential 7ea* "e0ui"e*8-iffe"ential 7ea* "e0ui"e*8


9/23

9


10/23

:,


11/23

::

Ca1itationCa1itation

NPSHR "s #he %"n"%+% NPSH #ha# %+s# 0e

a/a"*a0*e a# #he +% s+!#"'n "n 'rder #'

a/'"d !a/"#a#"'n3 As #he *"2+"d asses )r'%

#he +% s+!#"'n #' #he eye ') "%e**er #he

/e*'!"#y "n!reases and ress+re de!reases3

A*s' #here are ress+re *'sses d+e #'sh'!5s and #+r0+*en!e as #he *"2+"d -a"n

/e*'!"#y "n "%e**er /anes3 Press+re a# a**

'"n#s sh'+*d 0e s+))"!"en# s' as #' re%a"n

a0'/e #he /a'r ress+re ') #he *"2+"d3 Th"s

"s ens+red 0y %a"n#a"n"n- re2+"red NPSH a#

#he s+!#"'n3


12/23

:2

+%s "** -enera#e #he sa%e head +n"n)*+en!ed 0y #he se!")"! -ra/"#y ')#he *"2+"d3

S%eifi) G"a1it& 8S%eifi) G"a1it& 8


13/23

:3

Hydr'dyna%"! *'sses /ary "#h /"s!'s"#y3 W"#h "n!rease "n /"s!'s"#y. #here"s de!rease "n head -enera#ed and e))"!"en!y3

A*s' s"6e ') +% has s"-n")"!an# e))e!# ') *'sses3 S%a**er #he +%.

-rea#er #he e))e!#s ') /"s!'s"#y3 As hys"!a* s"6e ') #he +% "n!reases.

#he %a,"%+% /"s!'s"#y "# !an hand*e "n!reases3

(i)oit& 8(i)oit& 8


14/23

:

P+% %a#er"a*s %+s# 0e !'%a#"0*e "#h #he *"2+"d #' #he +%3

User has #' e"#her se!")y %a#er"a* #' %an+)a!#+rer 'r '#her re*e/an#

"n)'r%a#"'n. s"n!e *"2+"d ran-es )r'% !*ear #' #h'se !'n#a"n"n- -ases.

/a'rs. s'*"d %a#er"a*s3

Essen#"a* "n)'r%a#"'n sh'+*d "n!*+de #e%era#+re. se!")"!. -ra/"#y. H*e/e*. s'*"d !'n#en#. a%'+n# ') en#ra"ned a"r. 'r d"ss'*/ed -ases and

he#her *"2+"d "s !'rr's"/e 'r n'#3

F'r %a#er"a* se*e!#"'n. +% %an+)a!#+rer %+s# a*s' !'ns"der 'era#"n-

s#resses and e))e!#s ') !'rr's"'n. er's"'n and a0ras"'n3

Li0ui* )7a"a)te"iti)8Li0ui* )7a"a)te"iti)8


15/23

:

T;PICAL PUMP C!ARACTERISTIC CUR(E


16/23

:4

STARTING OF PUMPS

By r'/"d"n- a )''# /a*/e "n #he s+!#"'n *"ne3 $ I# "n/'*/es )r"!#"'na**'sses3 I# %ay *ea5 en'+-h #' r"%e #he +% 0e)'re ea!h s#ar#3

By !*'s"n- #he d"s!har-e /a*/e and #hen re*ease #he en#raed a"r"n #he !as"n- 0y 'en"n- #he a"r re*ease *+- a# #he h"-hes# '"n# ')#he !as"n-3

By r'/"d"n- a r"%"n- !ha%0er3 A r"%"n- !ha%0er has a !aa!"#yen'+-h #' )"** #he P+%3 These +%s are !a**ed Se*) Pr"%"n-P+%s

PRIMIN' :

The P+% "s )"**ed "#h +%"n- *"2+"d 0e)'re s#ar#"n-3 When s' )"**ed#he +% "s sa"d #' 0e r"%ed3

PRIMIN' I$ D(N) *Y:


17/23

:5

CAPACIT; REGULATION

Caa!"#y and 'er "n+# #' P+%s "#h Se!")"! Seeds + #' 7899$ Med"+% and L' Se!")"! Seeds( "n!rease "#h de!rease "n head3The dr"/ers ') s+!h +%s %ay 0e '/er *'aded ") #he head )a**s0e*' a sa)e %"n"%+% /a*+e3

In!reas"n- #he head ') h"-h se!")"! seed +%s de!rease !aa!"#y0+# "n!rease #he P'er "n+#3 The dr"/ers ') #hese P+%s sh'+*d

e"#her 0e a0*e #' %ee# 'ss"0*e *'ad "n!rease 'r 0e e2+"ed "#hs+"#a0*e '/er *'ad r'#e!#"'n

CAPACITY R)'U+ATI(N *Y: D"s!har-e Thr'##*"n-

S+!#"'n Thr'##*"n-

Byass re-+*a#"'n

Seed re-+*a#"'n

Re-+*a#"'n 0y ad:+s#a0*e -+"de /anes


18/23

:6

CAPACITY R)'U+ATI(N *Y $UCTI(N T,R(TT+IN':CAPACITY R)'U+ATI(N *Y $UCTI(N T,R(TT+IN':

Th"s %e#h'd !an 0e +sed ") s+))"!"en# NPSH "s a/a"*a0*e3 S'%e 'er !an0e sa/ed 0y #h"s %e#h'd3

*YPA$$ R)'U+ATI(N:*YPA$$ R)'U+ATI(N:A** 'r ar# ') #he +% !aa!"#y "s d"/er#ed #' P+% s+!#"'n 'r s'%e '#her'"n# #hr'+-h #he 0yass *"ne3 Byass *"ne !'n#a"ns 'ne 'r %'re %e#er"n-

'r")"!es and s+"#a0*e !'n#r'* /a*/es3Th"s %e#h'd "s ar#"!+*ar*y +sed )'r r'e**er +%s $ H"-h Se!")"! Seed+%s( )'r P'er sa/"n-#

CAPACITY R)'U+ATI(N *Y DI$C,AR') T,R(TT+IN':CAPACITY R)'U+ATI(N *Y DI$C,AR') T,R(TT+IN':Th"s %e#h'd "s +sed #' L' Se!")"! Seed P+%s3 Par#"a* !*'s"n- ') any/a*/e "n!reases #he sys#e% head3 Sys#e% res"s#an!e !+r/e %'/es +ardsand "n#erse!#s #he head !+r/e a# *'er !aa!"#y and s'%e 'er "s *'s# "n

#he #hr'##*e /a*/e3

Thr'##*"n- #' a '"n# ') !+# ')) %ay !a+se e,!ess"/e hea#"n- ') *"2+"d3 Th"s%ay re2+"re 0yass #' %a"n#a"n ne!essary %"n"%+% )*'3


19/23

:9

Caacity

,ead

CAPACITY REGULATION BY DISCHARGE THROTTLING AND BYPASS


20/23

2,

CAPACITY REGULATION BY SPEED VARIATION;CAPACITY REGULATION BY SPEED VARIATION;Used #' %"n"%"6e #he P'er re2+"re%en#s and e*"%"na#e '/er hea#"n- d+r"n-!aa!"#y %'d+*a#"'n3

S#ea% T+r0"nes In#erna* C'%0+s#"'n En-"nes are read"*y ada#a0*e "#h *"##*ee,#ra !'s#3

CAPACITY R)'U+ATI(N *Y AD-U$TA*+) .AN)$:CAPACITY R)'U+ATI(N *Y AD-U$TA*+) .AN)$:These Vanes r'd+!e a 's"#"/e re h"r*. h"!h red+!es #he Head. Caa!"#yand E))"!"en!y3

Re*a#"/e*y *' re-+*a#"'n "s '0#a"ned )'r P+%s "#h Se!")"! Seed ran-"n-)r'% 7


21/23

2:



22/23

22



23/23

23

REFERENCES

13 S#ear#. Ma+r"!e. Arn'*d. >en. ?S+r)a!e Pr'd+!#"'n Oera#"'ns V'*31Des"-n ') O"*@Hand*"n- Sys#e% and Fa!"*"#"es. B+##er'r#h@He"ne%ann.13

73 GPSA En-"neer"n- Da#a B''5 17#hed33 G"rdhar. Paresh. M'n"6. O##'. ? Pra!#"!a* Cen#r")+-a* P+%s Des"-n.

Oera#"'n and Ma"n#enan!e. IDC Te!hn'*'-"es. 79983

centrifugal pump - a process review.ppt

Documents