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8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
1/25
STEAM TURBINE VERSES SLOW SPEEDDIESEL ENGINE
STEAM TURBINE
• Has low thermal efce!c"#
• T$r%!e ca! %e acc$ratel"%ala!ce& a!& has m!m$m'%rato!s#
• There are !o !ter!al r$%%!()arts* th$s !o !ee& +or
!ter!al l$%rcato!# ,ee&water rema!s )$re#
• It has less com)o!e!ts* th$smecha!sm s 'er" sm)le#
• -a! %e co!s&era%l"
o'erloa&e& wth sl(htre&$cto! ! efce!c"#
• Re.$res se)arate aster!sta(es#
DIESEL ENGINE
• Thermal efce!c" s h(h#
• Dfc$lt to %ala!cecom)letel"* th$s '%rato!sare more* re.$res hea'"+o$!&ato!#
• There are 'aro$s !ter!alr$%%!( )arts re.$r!(!ter!al l$%rcato! tore&$ce wear o+ these )arts#
• Ma!" )arts ma/e themecha!sm com)lcate
• O'erloa& rat!( s less a!&+or short &$rato!#
• It s easl" re'ers%le#
1MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
2/25
DIESEL ENGINE
STEAM TURBINE
• D$e to h(h RPM* t$r%!e&e'elo)s h(h )ower +orsame s0e#
• ,or the same )ower* thes0e s m$ch smaller#
• Power &e'elo)e& s$!+orm* th$s t$r%!e &oes
!ot re.$re a 1"wheel#
• ,or )ro)$lso! )$r)oses*t$r%!e RPM has to %ere&$ce& +or %etter)ro)$lso! efce!c"#
• Steam t$r%!e re.$reslo!( )re)arato! +orstart!(#
• Re.$res less ma!te!a!ce#
DIESEL ENGINE
• RPM s low* th$s the )ower
&e'elo)e& s also low +orthe same s0e#
• Re.$res more s)ace +orthe same )ower#
• Tor.$e )ro&$ce& s o+)$lsat!( !at$re* +or whch
a lar(e 1"wheel s a m$st#
• Slow s)ee& &esel e!(!er$!s at o)tm$m RPM a!&('es (oo& )ro)$lso!efce!c"#
•
Desel e!(!e ca! %estarte& at 'er" short!otce#
• Nee&s hea'" ma!te!a!ce#
2MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
3/25
DIESEL ENGINE
STEAM TURBINE• Has low thermal efce!c"#
• T$r%!e ca! %e acc$ratel"%ala!ce& a!& has m!m$m'%rato!s#
• There are !o !ter!alr$%%!( )arts* th$s !o !ee&+or !ter!al l$%rcato!# ,ee&
water rema!s )$re#• It has less com)o!e!ts* th$s
mecha!sm s 'er" sm)le#
• Steam t$r%!e ca! carr"co!s&era%le loa& wthsl(ht re&$cto! !efce!c"#
• Re.$res re&$cto! (ear +or%etter )ro)$lso! efce!c"#
DIESEL ENGINE• Thermal efce!c" s h(h#
• Dfc$lt to %ala!ce
com)letel"* th$s '%rato!sare more* re.$res hea'"+o$!&ato!#
• There are 'aro$s !ter!alr$%%!( )arts re.$r!(
!ter!al l$%rcato! tore&$ce wear o+ these )arts#
• Ma!" )arts ma/e themecha!sm com)lcate
• O'erloa& rat!( s less a!&
+or short &$rato!#
• -PP s .$te s$ta%lewtho$t the !ee& to starta!& sto) 3MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
4/25
STEAM TURBINE VERSES MEDIUM SPEEDDIESEL ENGINE
STEAM TURBINE• D$e to h(h RPM* t$r%!e
&e'elo)s h(h )ower +orsame s0e#
• ,or the same )ower* thes0e s m$ch smaller#
• Power &e'elo)e& s
$!+orm* th$s t$r%!e &oes!ot re.$re a 1"wheel#
• ,or )ro)$lso! )$r)oses*t$r%!e RPM has to %ere&$ce& +or %etter)ro)$lso! efce!c"#
• Steam t$r%!e re.$reslo!( )re)arato! +orstart!(#
• Re.$res less ma!te!a!ce#
DIESEL ENGINE• RPM s low* th$s the )ower
&e'elo)e& s also low +orthe same s0e#
• Re.$res more s)ace +orthe same )ower#
• Tor.$e )ro&$ce& s o+)$lsat!( !at$re* +or whch
a lar(e 1"wheel s a m$st#
• Slow s)ee& &esel e!(!er$!s at o)tm$m RPM a!&('es (oo& )ro)$lso!efce!c"#
•
Desel e!(!e ca! %estarte& at 'er" short!otce#
• Nee&s hea'" ma!te!a!ce#
4MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
5/25
GAS TURBINE VERSES SLOW SPEEDDIESEL ENGINE
GAS TURBINE• Has low thermal efce!c"
a!& h(her mecha!calefce!c"
• T$r%!e ca! %e acc$ratel"%ala!ce& a!& has m!m$m'%rato!s#
• There are !o !ter!al r$%%!(
)arts* th$s !o !ee& +or!ter!al l$%rcato!#
• It has less com)o!e!ts* th$smecha!sm s 'er" sm)le#
• -a! %e co!s&era%le
o'erloa&e& wth sl(htre&$cto! ! efce!c"#
• Re.$res se)arate aster!sta(es whch s &le &$r!(ahea
DIESEL ENGINE• Thermal efce!c" s h(h
%$t mecha!cal efe!c"#• Dfc$lt to %ala!ce
com)letel"* th$s '%rato!sare more* re.$res hea'"+o$!&ato!#
•
!ter!al l$%rcato! s!ecessar" to re&$ce wearo+ !ter!al )arts#
• Ma!" )arts ma/e themecha!sm 'er"com)lcate
• O'erloa& rat!( s less a!&+or short &$rato!#
• Ths e!(!e s easl" ma&ere'ers%le#
5MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
6/25
DIESEL ENGINE
GAS TURBINE
• D$e to h(h RPM* t$r%!e
&e'elo)s h(h )ower +orsame s0e#
• ,or the same )ower* thes0e s m$ch smaller#
• Power &e'elo)e& s$!+orm* th$s t$r%!e &oes!ot re.$re a 1"wheel#
• ,or )ro)$lso! )$r)oses*t$r%!e RPM has to %ere&$ce& +or %etter)ro)$lso! efce!c"#
• Re.$res lessma!te!a!ce#
• Gas t$r%!e o)erates atlow wor/!( )ress$re#
DIESEL ENGINE
• RPM s low* th$s the )ower
&e'elo)e& s also low +orthe same s0e#
• Re.$res more s)ace +orthe same )ower#
• Tor.$e )ro&$ce& s o+)$lsat!( !at$re* +or whcha lar(e 1"wheel s a m$st#
• Slow s)ee& &esel e!(!er$!s at o)tm$m RPM a!&('es (oo& )ro)$lso!efce!c"#
• Nee&s hea'" ma!te!a!ce#• O)erat!( )ress$re s
$s$all" h(her#
6MOHD ANWAR
MATERIAL U ED , R TEAM
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
7/25
MATERIAL U ED , R TEAMTURBINES
7MOHD ANWAR
STEAM TURBINE VERSES SLOW SPEED
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
8/25
STEAM TURBINE VERSES SLOW SPEEDDIESEL ENGINE
STEAM TURBINE
• Thermal efciency is low
• T!r"ine can "e acc!ra#ely"alance$ an$ has minim!m%i"ra#ions
• There are no in#ernal r!""in&
'ar#s( #h!s no nee$ )orin#ernal l!"rica#ion *ee$wa#er remains '!re
• +# has less com'onen#s( #h!smechanism is %ery sim'le
•
,#eam #!r"ine can carryconsi$era"le loa$ wi#h sli&h#re$!c#ion in efciency
DIESEL ENGINE
• Thermal efciency is hi&h
• Difc!l# #o "alancecom'le#ely( #h!s %i"ra#ionsare more( re-!ires hea%y)o!n$a#ion
•
There are %ario!s in#ernalr!""in& 'ar#s re-!irin&in#ernal l!"rica#ion #ore$!ce wear o) #hese 'ar#s
• Many 'ar#s ma.e #he
mechanism com'lica#e$• O%erloa$ ra#in& is less an$
)or shor# $!ra#ion
/MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
9/25
METHODS O, BLADES ,I2ING• T$r%!e %la&es are ma&e o+
corroso! ressta!ce steel wth!te(ral root a!& !te(ral te!o! +or
the shro$
• Bla&es ma" ha'e 'aro$s t")es o+root +aste!!(s whch !cl$&eserrate& root* stra&&le T * !'erte&
T* 3r tree or stra&&le 3r tree* m$ltroot etc# Bla&es ma" %e mo$!te& !se(me!ts or !&'&$all"#
• I! case o+ se(me!tal %la&!(* 4567
%la&es are assem%le& to(ether wth&sta!ce )eces a!& shro$& %e+ore3tt!( them o! the rotor# N$m%er o+%la&es are &eterm!e& as )er'%rato! co!s&erato!#
0MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
10/25
A2IAL ENTR8 BLADING• I! case o+ !te(ral %la&!(*
each %la&e s a! e!tt"* t hast9s ow! root a!& are 3tte&
s!(l"#
• The %la&es are sec$re& ! the(roo'es* mach!e& ! the rotorto com)leme!t the sha)e o+
the root#
• D$e to h(h ce!tr+$(al +orces*root &es(! s 'er" com)le:#
•
The t)s o+ the a&;ace!t %la&esare $s$all" attache& %" ashro$& ! (ro$)s o+
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
11/25
TURBINE ROTORS• T$r%!e rotors ma" %e sol&*
hollow* %$lt $) or (asheGashe& rotors are ma!l"
$se& ! mo&er! t$r%!esaltho$(h some IP t$r%!es$tl0e %$lt $) co!str$cto!#
• ,or %$lt $) rotor* the sha+t
s ste))e& &ow! +romm&&le o! ether s&e a!&wheels are shr$!/ o! wth/e"s#
• Gashe& rotors are sol&*allow e:)a!so! o+ rotora!& cas!( a!& ma!ta!closer a:al cleara!ce#
11MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
12/25
DOUBLE -ASING ARRANGEMENT
• Use o+ h(h tem)erat$re a!& )ress$re steam ca$ses)ro%lems ! &es(!* ths arra!(eme!t s a sol$to! to these)ro%lems#
• The o$ter cas!( has to %e thc/ to resst h(h )ress$resa!& acts as ma! s$))ort (r&er +or t$r%!e rotor# 12MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
13/25
>-ONTINUED?
• The !!er cas!( s ma&e to e:)a!& +reel" a!& hasa%lt" to a%sor% thermal stresses &$e to lar(e
e:)a!so! ca$se& %" the h(h tem)erat$re steam#
• The !!er cas!( s +$ll" s$))orte& %" the o$tercas!( whch acts as a s$))ort cra&le#
• The o$ter cas!( s s$%;ecte& to e:ha$st steam)ress$re a!& tem)erat$re a!& ma!ta! co!ce!trct"a!& al(!me!t rres)ect'e o+ e:)a!so!s#
•E:ha$st steam %etwee! the cas!(s acts as a steam
;ac/et a!& re&$ces heat losses +rom the s$r+aceswhch m)ro'e thermal efce!c"#
13MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
14/25
DIAPHRAGMS
14MOHD ANWAR
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
15/25
DIAPHRAGMS >-ONTINUED?• Da)hra(ms )ro'&e se)arato!s %etwee! the &scs a!&
hol& ether !o00les or 3:e& %la&es#
• Allowa!ce +or e:)a!so! m$st %e )ro'&e& +or&a)hra(ms s$ch that the" also ma!ta! the sha+t(la!& cleara!ce to a m!m$m#
• Lower hal+ o+ &a)hra(m s s$))orte& ! lower cas!( %"two l$(s rest!( ! cas!( a!& recesse& ! &a)hra(m# U))er hal+ s s$))orte& %" two )lates slott!( !to$))er ;o!t a!& recesse& !to &a)hra(m# -e!ter!(%e!( &o!e %" ra&al /e"s#
• Prese!t &a" &a)hra(ms are o+ all wel&e& co!str$cto!#No00les are )osto!e& %" close 3tt!( %a!&s whch arethe! wel&e& to(ether to +orm a co!t!$o$s str$ct$re#
15MOHD ANWAR
GLAND SEALING
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
16/25
GLAND SEALINGARRANGEMENT
• I! or&er to )re'e!t steam lea/a(e* most steam
t$r%!es $se la%"r!th )ac/!( where the sha+t scom!( o$t +rom cas!(#
• The !war& )o!t!( crc$m+ere!tal r&(es o! the16MOHD ANWAR
GLAND SEALING ARRANGEMENT
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
17/25
GLAND SEALING ARRANGEMENT>-ONTINUED?
• Th$s the )ac/!( &oes !ot com)letel" sto)s lea/a(e %$tlmts t to tolera%le amo$!t#
• As steam s +orce& o$t o+ the cas!( $!&er )ress$re*each r&(e )ro&$ces a! o%stacle to the 1ow o+ steama!& there%" &ro))!( t9s )ress$re a'ala%le +or
s$%se.$e!t r&(e#
• I! lar(e t$r%!es * lea/ o= steam alo!(@wth lea/e& @!ar s le& to reco'er" co!&e!ser#
• A s!(le r!( o+ la%"r!th )ac/!( s $se& as !ter@sta(e)ac/!( ! the &a)hra(m o+ m)$lse t$r%!es#
17MOHD ANWAR
GEARING IN MARINE USE
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
18/25
GEARING IN MARINE USE• Gear!( s $se& o! mar!e t$r%!es +or com%!!( the
)ower o+ HP* IP a!& LP t$r%!es a!& to tra!smt )ower to)ro)eller at low re'ol$to!s#
• T$r%!es o)erate at h(h RPM at whch )ro)ellerefce!c" s low# I! or&er to m)ro'e )ro)eller efce!c"*RPM o+ o$t)$t sha+t s ma!ta!e& %etwee! 56C %"re&$cto! (ear!(#
• Helcal s)$r (ears are $se& whch o=er %etter&str%$to! o+ loa&* .$te a!& smooth o)erato!# S!(lehelcal (ear !tro&$ce a:al thr$st %$t &o$%le helcal(ear!( o'ercomes ths &fc$lt" %" ca!cel!( the a:al
thr$st o! each other#
• Varo$s arra!(eme!ts o+ (ear!( are $se& ! mar!e3el
1/MOHD ANWAR
EPI-8-LI- GEARING
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
19/25
EPI-8-LI- GEARING• I! )arallel sha+t (ears* the a:s
are 3:e& whereas ! thee)c"clc at least o!e a:s mo'esrelat'e to a!other 3:e& a:s#
• A! e)c"clc (ear co!ssts o+ as$! wheel o! the ce!tral a:s* a!ter!all" toothe& r!( calle& thea!!$l$s* )la!et or star wheelcarrer a!& )la!ets or starwheels whch re'ol'e o!s)!&les attache& to the carrer#
• Ths arra!(eme!t ca! ('es)ee& re&$cto!s o+ 6 to 676&e)e!&!( $)o! relat'e (earwheel &me!so!s#
• Ma! &=ere!ce%etwee! )arallelsha+t (ears a!&e)c"clc s o+ the 10MOHD ANWAR
DOUBLE REDU-TION GEARING
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
20/25
DOUBLE REDU-TION GEARING• Do$%le re&$cto! (ear!( s commo!l"
$se& where t$r%!e s)ee&s (o $)to FRPM
• Artc$late& (ear!( allows easer remo'alo+ !&'&$al tra!s a!& ('es (reater1e:%lt" ! carr"!( o$t al(!me!t#
• I!terlea'e& &es(! s a! alter!at'e
arra!(eme!t where the )rmar" wheelsstra&&le the seco!&ar" wheels a!& ths&es(! s more com)act# A t")cal &o$%lere&$cto! (ear co$l& ('e s)ee& rato o+
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
21/25
LUBRI-ATION O, STEAM TURBINE• Mo&er! tre!& o+ steam t$r%!e l$%rcato! s %" )ress$re s"stem
whch re&$ces s0e o+ (ra't" ta!/* le!(th o+ ))!( a!& re&$cto! !ol .$a!tt" lea&!( to co!s&era%le eco!om"#
• A sa+e($ar& m$st %e )ro'&e& to e!s$re that the %ear!(s are !otr$! o$t ! the e'e!t o+ ol )$m) +al$re# Wth (ra't" s"stem* ths ssm)le as the ol +rom (ra't" ta!/ wll 1ow $!tl t$r%!e to rest#
•
Wth )ress$re s"stem* a! a$:lar" )$m) co$l& start a$tomatcall"*%$t ths wo$l& !ot %e sats+actor" ! the e'e!t o+ total electrcal%lac/o$t#
• A small (ra't" ta!/ at a lower le'el ma" )ro'e to %e a %etter a!&sa+er arra!(eme!t#
21MOHD ANWAR
GRAVIT8 LUBRI-ATION S8STEM
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
22/25
GRAVIT8 LUBRI-ATION S8STEM
22MOHD ANWAR
GRAVIT8 LUBRI-ATION S8STEM
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
23/25
GRAVIT8 LUBRI-ATION S8STEM>-ONTINUED?
• Ol s &raw! +rom the s$m) 'a a s$cto!ma(!etc 3lter%" )$m) a!& &schar(e& 'a 3lter a!& cooler to
)ress$re &str%$to! ))!(#
• Some amo$!t o+ ol s co!t!$o$sl" +e& to (ra't" ta!/swhch /ee) o'er1ow!( to s$m)* th$s /ee)!( the(ra't" ta!/s 3lle& $) at all the tme#
• I! the e'e!t o+ )$m) +al$re* sta!&%" )$m) wlla$tomatcall" ta/e o'er# I! case o+ %lac/o$t* ol wll 1owto the &str%$to! )o!ts thro$(h !o! ret$r! 'al'e at6#F %ar )ress$re +or a%o$t three m!$tes as emer(e!c"
s$))l"# Us$al s$))l" )ress$re %e!( #6 %ar
• Ol !let tem)erat$re s ma!ta!e& at a%o$t
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
24/25
PRESSURE LUBRI-ATION S8STEM
24MOHD ANWAR
PRESSURE LUBRI-ATION S8STEM
8/19/2019 COMPARISON BETWEEN VARIOUS TYPE OF PROPULSIONS.ppt
25/25
PRESSURE LUBRI-ATION S8STEM>-ONTINUED?
• Ol s &raw! $) +rom s$m) %" !&e)e!&e!t )$m)s#
• Whe! t$r%!e s starte&* attache& )$m) starts %$l&!($) )ress$re a!& !&e)e!&e!ts )$m)s are c$t o=#
• A small (ra't" ta!/ ! the to) o+ (ear case s /e)t
alwa"s +$ll#
• Whe! t$r%!e s sto))e& the! o!e o+ the two!&e)e!&e!t )$m)s wll start a$tomatcall"#
• I! the e'e!t o+ a %lac/ o$t whe! t$r%!e RPM re&$ces*(ra't" ta!/ s$))les ol thro$(h !o! ret$r! 'al'e +ora%o$t m!$tes tll the! o)erator ca! start a$:lar")$m) or sto) the mach!er"*
25MOHD ANWAR