Steam Turbine Lube Oil and Control Oil System

STEAM TURBINE LUBE OIL SYSTEM

By Moinuddin

CONTENTS    

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WHY LUB OIL SYSTEM IS NECESSARY COMPONENTS OF LUB OIL SYSTEM FLOW DIAGRAM OF LUB OIL SYSTEM FUNCTIONS OF INDIVIDUAL COMPONENTS OIL FLOW TO DIFFERENT BRANCHES PROTECTIONS

LUB OIL SYSTEM Ste! tu"#ine $u#e oi$ %y%te! i% u%u$$y "e&ui"ed to '"o(ide oi$ )o" t"i'*nd*t+"ott$e ($(e, -o(e"no" %y%te!, #e"in-%.

Oi$ C+"/te"i%ti/% Physical & Chemical Properties CEI0ISO Vi%/o/ity /$%% 3ine!ti/ Vi%/o/ity /St t 45 de- C F$%+ Point Vi%/o%ity Inde; Neut$i t+e oi$ %+$$ #e /'#$e o) '"e(entint+e )o"!tion o) "u%t on %tee$ '"t% #t+ed @it+ oi$, %+ou$d %!$$ &untitie% o) @te" ente" t+e oi$ in t+e no"!$ o'e"tion o) %te! tu"#ine.

Oi$ P"o'e"tie% 

Re%i%tn/e to o;idtion > )o" $on- %e"(i/e in %te! tu"#ine %y%te!%, t+e $u#"i/tin- oi$ !u%t +(e +i-+ "e%i%tn/e to o;idtion to '"ote/t -in%t t+e )o"!tion o) %$ud-e nd in -ene"$ to !intin $$ initi$ /+"/te"i%ti/%.

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Wte" 8 %e'e"tin- #i$ity> +i-+$y "ened oi$% @i$$ %e'"te )"o! @te" !o"e "edi$y t+n oi$% @+i/+ +(e #een /ont!inted in %e"(i/e o" @+i/+ +(e #e-un to )o"! in%o$u#$e %$ud-e.

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Re%i%tn/e to )o!in-> +i-+ &u$ity tu"#ine oi$% %+ou$d +(e -ood "e%i%tn/e to )o!in-.

Gene"$ in)o"!tion Oi$ Tn C'/ity> 9655 Lt  Lu#e Oi$ F$o@ > 765 Lt0!in  Wo"in- Te!' > 65 de- C  Oi$ Hede" P"e%%u"e> :.7 #"  Oi$ (i%/o/ity > 25.4CST  65 de- C  Oi$ Ty'e > ISO VG 12 

MAIN  AU OIL PUMP  T@o in nu!#e"%  S'e/i/tion% 8C'/ity* :255 Lt0!in  Di%/+"-e '"* J #"  De%i-n P" 8 :5 #".  Wo"in- te!'> :6 8 =5 de- C  S'eed * :465 "'!  D"i(e * A.C. Moto"  Moto" 'o@e"*15 3W 

EMERGENCY OIL PUMP  

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P"o(ided % #/ u' '"ote/tion Cut% in @+ene(e" t+e"e i% AC )i$u"e o" t+e '"e%%u"e in t+e $u#"i/tion %y%te! )$$% $e%% t+n 5.9 #" S'e/i/tion%* C'/ity*765 Lt0!in Di%/+"-e '"*4 #" S'eed*:=65 "'! D"i(e*D.C Moto" Moto" 'o@e"* ::@

DUPLE FILTER        

Lu#"i/tion Oi$ Ty'e > ISO VG 12 F$uid Vi%/o/ity > :5.2 C%t  =5 de- C S'e/i/tion%* Wo"in- Te!' > :6 8 =5075 de- C Wo"in- PR > 60:5 #". De$i(e"y > !in0 !; 8 755 0 915 Lt0!in Fi$t"tion> 21 !i/"on%. De$t no"!$ 0 !;> 5.1 8 :.50 :.6 #"

FLOW CONTROL VALVE F$uid > Oi$ ISO VG 12  S' G"(ity t o'e" /ond> 5.762 t 65 de- C  O'e" Vi%/o%ity /%t > 2=.7 C%t  65 de- C  Cont"o$ "n-e > :.6 to 2.6 #".  Settin- ($ue > :.7 #" 

LUBE OIL ACCUMULATOR 

 Ty'e

> #$dde"

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No!in$ /'/ity > :55 Lt

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De%i-n '"e%%u"e

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> :6 #"

 Te%t '"e%%u"e > 22.6 #"

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De%i-n te!'e"tu"e > 75 de- C

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Oi$ ty'e

> LUBE OIL ISO VG 12

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Vi%/o/ity

> :5.2 /St t =5 de- C

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O'e"tin- te!'e"tu"e > *:5 to K75 de- C

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O'e"tin- '"e%%u"e > 9 #"

 THERMOSTATIC VLAVE F$uid > LUBE OIL ISO VG 4J  S' -"(ity  o'e"tin- /ond > 5.7=6 3-0 /d!  O'e"tin- (i%/o%ity > 2=.7  65 de- C  F$o@ > 955 Lt0!in  Te!'e"tu"e > 4J de- C  P"e%%u"e  no"!$ ?o@ > 4 -0%/! IN 1.J2 -0%/! OUT  Set 'oint > 4J de

SLC AOP Co!!nd -oe% to %@it/+ ON AOP W+en >SLC AOP IS ON nd MOP t"i'% OR Oi$ '"e%%u"e  :.1%/ 

SLC EOP EOP ON Co!!nd -oe% @+en  SLC EOP i% on nd Lu# oi$ '"e%%u"e 5.9 #" 

MAIN OIL COOLERS Pu"'o%e i% to /oo$ t+e oi$ , Wte" i% in%ide t+e tu#e nd oi$ ?o@% in oute" %+e$$  M;i!u! $u#"i/tin- oi$ te!'e"tu"e t /oo$e" out$et "e%t"i/ted to 4= de Be"in- !et$ te!'e"tu"e $"!* 95 de%+ut do@n*:25 de  T+"ee @y /ont"o$ ($(e* E$e/t"i/$$y d"i(en  +% t+e )un/tion o) "e-u$tin- $u#"i/tin- oi$ te!'e"tu"e 

CENTRIFUGE 

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D"@% oi$ )"o! tu"#ine oi$ tn !in$y DOT, )te" "e!o(in- ny @te"  ent"ined %o$id !tte" oi$ i% "etu"ned #/ to oi$ tn Cent"i)u-e doe% t@o )un/tion%> C$"i/tion*S$ud-e %e'"tion in @+i/+ t+e !/+ine i% u%ed )o" %e'"tin- o '"ti/$e% no"!$$y %o$id Pu"i/tion*Li&uid oi$ 8Li&uid @te"%e'"tint@o inte"!i;ed $i&uid% @+i/+ "e in%o$u#$e in e/+ ot+e"  +(e die"ent %' -"(itie%. So$id% @it+ %'-" +i-+e" t+n t+o%e o) $i&uid /n #e %e'"ted o) t t+e %!e ti!e

MOT VAPOUR ETRACTOR Mounted on to' o) !in oi$ tn  Fun/tion i% to '"odu/e %$i-+t ne-ti(e '"e%%u"e in !in oi$ tn nd in t+e #e"in- /%innd t+u% d"@% o oi$ ('ou"  Oi$ ('ou" #e)o"e e;+u%tin- to t! i% '%%ed t+"ou-+ oi$ /t/+e" 

MOT VAPOUR ETRACTOR 

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Se"(i/e > e;t"/tion nd %'$ittin- i" 0 oi$ )u!e%. F$iid > oi$ %tu"ted i" C'/ity > 155 !/0+ t 26 de- C O'e"tion te!'e"tu"e > 45 de- C !; Su/tion '"e%%u"e > :=6 !#" Fi$te"in- e$e!ent% > /o$e%/ent /"t"id-e% Moto" 'o@e" > 2.2 @

P"ote/tion%  T+e !ini!u! oi$ te!'e"tu"e ($ue to %t"t t+e oi$ 'u!'% e&u$ to 5!C   T+e !ini!u! oi$ te!'e"tu"e ($ue to 'ut in %e"(i/e t+e tu"nin- -e" e&u$ to "0 !C  T+e !ini!u! oi$ te!'e"tu"e ($ue to "unnin- t+e tu"#ine e&u$ to 35!C  Coo$in- @te" to oi$ +ete"% %+ou$d #e /$o%ed unti$ t+e di%/+"-e $u#"i/tin- oi$ te!'e"tu"e t tu"#ine #e"in-% in$et, "e/+e%  ($ue o) ∼ 41*49C 

PROTECTIONS Du"in- t+e o'e"tion, t+e no"!$ oi$ te!'e"tu"e "n-e %+ou$d #e "ound t+e )o$$o@in- ($ue% >  Lu#e oi$ te!'e"tu"e t #e"in-% in$et ∼ 65÷62C.   T+e !;i!u! $$o@ed ($ue% %+ou$d #e 66C.  Be"in- oi$ di%/+"-e te!'e"tu"e% %+ou$d not e;/eed 76C. A$"! t 75C nd t"i' t 76C 