III. TINJAUAN PUSTAKA
3.1 Sistem Sistem Instrumen Instrumentasi tasi
Instrumentasi adalah alat-alat dan piranti yang dipakai untuk pengukuran dan pengendalian dalam suatu sistem yang lebih besar dan lebih kompleks kompleks Fungsi Instrumentasi pada suatu proses industri diklasifikasikan dalam empat golongan yaitu
(3:3)
:
a. Seba Sebag gai alat alat Ukur Ukur,, yaitu aitu untu untuk k memo emonito nitorr kondi ondisi si opera perasi si,, melal elalui ui pengukuran proses ariabel yang mempengaruhi !alannya operasi seperti tekanan, temperatur, !umlah aliran, leel dan sebagainya. b. Sebagai alat "ontrol, yaitu untuk mengendalikan !alannya operasi agar proses ariabel selalu sesuai dengan harga yang diinginkan #. Sebagai alat Safety, Safety, yaitu yaitu untuk untuk men#eg men#egah ah kerusa kerusakan kan pada pada perala peralatan tan dan men#e men#ega gah h ke#e ke#elak lakaa aan n pada pada oper operato ator, r, !uga !uga sebag sebagai ai siste sistem m alarm alarm yang ang memberitahu operator bila proses ariabel men#apai nilai kritis, baik kritis minimum maupun kritis maksimum d. Seba Sebaga gaii alat alat $nal $nalis isa, a, yaitu yaitu untu untuk k meng mengan anali alisa sa prod produk uk apak apakah ah suda sudah h sesua sesuaii dengan spesifikasi yang diinginkan atau belum, !uga digunakan untuk men#egah polusi yaitu dengan menganalisa air buangan apakah tidak mengandung minyak yang membahayakan lingkungan.
1
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3.2 Metering and Regulating Station (M/RS (M/RS
%eteri %etering ng and &egula &egulatin ting g Statio Station n (%'&S) (%'&S) adalah adalah salah salah satu unit unit lengka lengkap p pendukung dalam distribusi gas yang yang terdiri dari :
. &egula &egulatin ting g (regula (regulator tor'ka 'katup tup penuru penurun n tekana tekanan) n) untuk untuk menuru menurunka nkan n dari dari tekanan besar ke tekanan yang diinginkan serta memenuhi kapasitas yang diminta. anpa regulating, system pengapian pada tungku ' oen ' alat pembakar lainnya sukar dikendalikan dikendalikan karena tidak adanya adanya system yang mengatur besaran kapasitas dan tekanan gas, sehingga panas yang dihasilkan tidak sempurna.
REGULATING STATION
!am"ar 3.1 S#ema $asar Regulating Station (R/S
*. %etering adalah tempat pen#atatan semua besaran gas yang telah digunakan oleh konsumen.%'&S memberikan kontrol dan akurasi yang tepat untuk tekanan dan kapasitas gas yang diinginkan konsumen.
METERING STATION
!am"ar 3.2 S#ema $asar Metering Station (M/S
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Sehing Sehingga ga !ika %eteri %etering ng Statio Station n dan &egula &egulatin ting g Statio Station n !ika !ika dirang dirangkai kai sebagai %'&S adalah sebagai berikut
REGULATING
METERING
STATION
STATION
!am"ar 3.3 S#ema $asar 'ungsi M/RS
Sehingga bisa disimpulkan bah+a fungsi daripada %'&S adalah : .
%enurunkan tekanan gas dari sistem !aringan pipa distribusi ke pelanggan
*.
%en!aga ag a gar te t ekanan ga gas ya yang ke keluar da d ari %' % '&S da d a la m keadaan konstan
3.
%engatasi tekanan yang berlebihan atau keke#ilan.
.
%engukur !umlah gas yang mengalir melalui meter dalam unit %'&S
3.3 Prinsi% Ker&a Metering Metering and Regulating Station Station
ara ara ker!a ker!a meterin metering g regula regulatin ting g station station ialah ialah mengali mengalirka rkan n gas melalu melaluii inlet%'&S dan mengeluarkan gas dengan tekanan yang sesuai dengan keinginan padaoutlet.$gar kondisi gas bersih maka dipasanglah filter. as akan mele+ati slum slum shut shut of ale ale (SS/0) (SS/0) yang yang berfun berfungsi gsi untuk untuk menutu menutup p aliran aliran gas apabil apabilaa ter!adi ter!adi oerpr oerpressu essure re di do+nst do+nstream ream.. Selan!u Selan!utny tnyaa gas akan akan mengali mengalirr melalu melaluii
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aktif tekanangas akan diturunkan diturunkan sesuai dengan dengan kebutuhan kebutuhan pelanggan. pelanggan. Setelah melalui melalui regulator, regulator, apabila ter!adi ter!adi oerpressure, oerpressure, sebagian aliran gas akan dibuang dibuang melal melalui ui relie relieff of al ale. e. Sete Setela lah h itu itu alir aliran an gas gas diuk diukur ur deng dengan an turb turbin inee mete meter. r. "emudian gas akan masuk ke pelanggan.
2ada umumnya %'&S dipasang dua stream (aliran), yang bertu!uan apabila stream yang beroperasi beroperasi rusak atau tidak bisa beker!a beker!a lagi, maka stream satunya satunya (stand by) dapat mengganti menggantikan kan ker!a stream apabila tersebut se#ara automatis automatis berdasarkan setting regulator dan setting shut off ale, sehingga penyaluran gas ke pelanggan tidak terhenti dan pasokan gas dapat berlangsung terus-menerus &eg &eg %onitor inlet ale $ktif &elief Filter SS/0
2I
2I
2I I
outlet ale
2I
/perated
y pass meter
2I 2I I
Insulating 4oint
Stand by 2I
inlet ale urbin meter 2I
inlet ale
2I
SS/0
2I
&elief outlet ale
&eg &eg %onitor $ktif
!am"ar 3. S#ema M/RS
outlet ale
Insulating 4oint
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%etering %etering and &egulating Station memiliki memiliki berma#am berma#am konfigurasi konfigurasi dengan tu!u tu!uan an yang sama sama yaitu yaitu untu untuk k meny menyup uplay lay gas gas dan dan menu menuru runk nkan an teka tekana nan n ke pelanggan,namun memiliki keuntungan dan kerugian yang berbeda beda. 2enggunaannyapun 2enggunaannyapun berdasarkan fungsi yang dibutuhkan
a. Single Stream * A+ti,e * Slam S-ut
Type %'&S ini tidak men!amin kelangsungan aliran ke pelanggan,
6.1 4 6.2
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T E L N I
!am"ar 3. S#ema Single Stream*a+ti,e*slam Stream*a+ti,e*slam s-ut (30 Kom%onen
. Inlet fl flange * Insulati ating !o !oint 3 Isolation a ale 3. isolation ale 5 plug plug Inle Inlett pre presssure sure gau gauge 6 Inle Inlett regu regula lato torr al alee 7 Filter 7. filter dp gauge 7.* three +ay manifold 8 Slam shut a ale
9. ; * 3 6
8. 2ilot slam shut shut ale ale $#ti $#tie e regu regula lato tor r 9. pilot a#tie regulator /utl /utlet et pres pressu sure re gau gauge &eli &elief ef al alee Stream Stream dis#rim dis#rimina inatio tion n ale ale /utlet /utlet regula regulator tor ale ale Inlet' Inlet'out outlet let meter meter al alee urb urbin in met meter er /utl /utlet et flang flangee
Ta"el 3.1Single Stream * A+ti,e * Slam S-ut
13
O U T L E T
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mempunyai kapasitas sangat ke#il dan pada umumnya digunakan untuk pelanggan pabrik dengan kapasitas ke#il atau pelanggan komersial. ". Tin Stream * A+ti,e * Slam S-ut
1esain type %'&S type %'&S ini dapat men!amin kontinuitas aliran gas kepelanggan,
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!am"ar 3. S#ema Tin Stream*a+ti,e*slam Stream*a+ti,e*slam s-ut (3
"omponen . Inlet Flange *. Insulating 4oint 3. Isolation 0ale 3. Isolation 0ale 5 2luge Inlet 2ressure auge 6 Inlet &egulator 0ale 7 Filter 7. Filter 1p 1p auge 7.* hree
9 $#tie &egulator 9. 2ilot $#tie &egulator /utlet 2ressure auge ; &elief 0ale Stream 1is#rimination 0ale * /utlet &egulator &egulator 0ale 3 Inlet'/utlet %eter 0ale urbin %eter 6 0olume orre#tor 7 /utlet Flange
Ta"el 3.2 Tin Stream * A+ti,e * Slam S-ut
4ika regulator yang sedang operasi mengalami gangguan misalkan tekanan
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Slam Shut of Valve, Valve , sedangkan aliran gas ke pelanggan tidak akan terganggu terganggu dan pelanggan tetap dapat berproduksi karena se#ara otomatis la!ur siaga ( standby) standby) akan mengambil alih atau menggantikan mengontrol pendistribusian alirangas +. Single Single Str Strea eam m * Monitor Monitor/A+ /A+ti, ti,ee * Slam S-ut S-ut
15 6.1
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!am"ar 3. S#ema Single Stream*Monitor/A+ti,e*Slam Stream*Monitor/A+ti,e*Slam S-ut (32
"omponen . Inlet Flange *. Insulating 4oint 3.Isolation 0ale 3. Isolation 0ale 5 2luge 2luge .Inlet 2ressure auge 6.Inlet &egulator 0ale 7.Filter 7. Filter 1p auge auge
9.%onitor ' $#tie &egulator 9. 2ilot %onitor &egulator 9.* 2ilot $#tie &egulator /utlet 2ressure auge ; &elief 0ale Stream 1is#rimination 0ale * /utlet &egulator 0ale 3 Inlet'/utlet %eter 0ale
O U T L E T
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RegulatorActive untuk untuk mengontrol mengontrol tekanan tekanan inl inlet et sehingga tekanan tekanan outl outlet et tetap sesuai denganyang diinginkan.
d. Tin Stre Stream am * Monitor/ Monitor/A+ti A+ti,e ,e * Slam S-ut
2ada 2ada dasa dasarn rny ya type %'&S %'&S ini hamp hampir ir sama sama denga dengan n type type %' %'&S Twin Stream -Active - Slum Shut Shu t hanya sa!a di masing - masing masing stream ditambahkan %onitor&egulator
13
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2
15 12
5 3 7
9 11
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1 T E L N I
10
4
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!am"ar 3.4 S#ema Tin Stream*Monitor/A+ti,e*Slam Stream*Monitor/A+ti,e*Slam S-ut (3
"omponen
15 12
O U T L E T
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3. 5agian*5agian Metering Metering and Regulating Regulating Station M/RS
"omponen- "omponen Utama pada %'&Sterdiri atas (:6) : 1. Isol Isolat ation ion 6al 6al,e ,e (Inle (Inlet* t*7u 7utl tlet et
0ale 0ale ini bergun bergunaa untuk untuk mengis mengisola olasi si tekana tekanan n masuk masuk (inlet (inlet)) 5 tekana tekanan n keluar (outlet), biasanya berupa ball ale. Ball ale. Ball valve adalah valve adalah valve yang memiliki bola yang menggantung pada hand hand wheel wheel . 2ada 2ada bola bola ters terseb ebut ut terd terdap apat at lubang.Va lubang.Valv lvee dalam kondisi kondisi op open apabila apabila lubangterseb lubangtersebut ut searah dengan pipa. Sedangkan valve dalam valve dalam kondisi close apabila close apabila lubang tidak searah dengan pipa. Ball valve diguna digunakan kan untuk untuk perala peralatan tan yang yang membut membutuhk uhkan an shut shut off off se#arasempurna. Ball Ball valve banyak banyak digunakan digunakan untuk keperluan keperluan industri karena serba guna, mudah diperbaiki dan mudah dioperasikan se#ara manual. 2. Insu Insulat latin ing g Joi Joint nt (Inl (Inlet et*7u *7utl tlet et
4aringa 4aringan n pipa pipa distri distribus busii gas yang yang menggu menggunak nakan an pipa pipa ba!a ba!a dileng dilengkap kapii dengan dengan
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3. !as 'ilter
!am"ar 3.9 'ilter
!am"ar 3.10 Kom%onen $alam 'ilter
!ilter adalah adalah alat yang yang berfun berfungsi gsi untuk untuk menya menyaring ring kotora kotoran. n. $pabil $pabilaa kotora kotoranti ntidak dak disarin disaring, g, kotora kotoran n terseb tersebut ut akan akan mengga menggangg nggu u kompon komponen en %'&S %'&S ."omponen %'&S yang paling rentan apabila aliran gas tidak disaring adalah turbin turbinee meter meter . 1alam industr stri migas filter yang ang baik adalah filter yang menyebabka menyebabkan n "ressure #rop(d2) #rop(d2) tidak lebih dari ;. bar dan dapat menyaring kotoran yang berukuran 6; mi#ron. . Sa)et Sa)et8 8 S-ut S-ut 7)) 7)) 6al, 6al,e/ e/ Slam Slam S-u S-utt 6al,e 6al,e
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. Regulator S%ring
$is# 6al,e
!am"ar 3.12 Regulator
&egula &egulator tor adalah adalah alat alat yang yang diguna digunakan kan untuk untuk mengat mengatur ur tekana tekanan n keluar keluar (outlet), (outlet), biasanya menurunkan menurunkan tekanan. 1i alat %'&S, regulator regulator adalah alat ital. %aka kiner!a regulator ini harus dipantau sehingga perlu ada pengaman dalam komponen ini !ika regulator tidak beker!a dengan baik. 2eker!aan utama regulator sebenarnya diambil oleh regulator aktif,adanya regula regulator tor monit monitor or adalah adalah untuk untuk memoni memonitor toring ing sa!a dan mengam mengambil bil alih alih tugas tugas regulator aktif !ika terdapat masalah
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&elief ale adalah sebuah alat untuk pelepas tekanan yang berlebihan. 2ada 2ada satuan satuan unit unit %'&S %'&S relief relief ale ale dipasan dipasang g sesudah sesudah regula regulator tor &elief &elief ale ale akanselalu tertutup dan akan membuka !ika tekanan masuk yang melebihi nilai yang telah ditentukan sebelumnya. . :-e+# 6al,e
he#k 0ale adala adalah h alat alat untu untuk k memb memberi eri prot protek eksi si pada pada sistem sistem t+in t+in stream.4ika la!ur operasi ber!alan normal melepas kapasitas dan tekanan gas maka +afer #he#k ale membuka membuka dan pada la!ur stand by +afer #he#k ale menutup menutup berarti mengisolasi tekanan yang lebih tinggi menu!u slam shut ale melalui sensing line. 4. 'lo 'loSt Stra raig ig-t -tne ners rs
Flo+ Straightners berfungsi untuk membuat aliran gas yang turbulen
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berdasarkan $$ &eport @o. 8 A%eas A%easur urem emen entt of gas gas by urb urbin inee metersB
b. &otary 2ositie 1ispla#ement %eter (%eter &otary)
!am"ar 3.1 S#emati# Rotar8 Meter
!am"ar 3.1 Rotar8 Meter
%eter yang memakai putaran baling-baling, mat#hing gear, atau pergesaran baling-baling yang membuat gas-tight #onta#t dengan dinding
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2ressure gauge adal adalah ah
alat alat
untu untuk k
mengukur tekanan gas dengan menun!ukkan pointer pada skalanya !am"ar 3.19 Pressure !auge
11. T-ermometer T-ermometer gauge (Inlet*7utle (Inlet*7utlet t
erm ermom omete eterr gaug gaugee adal adalah ah alat alat untu untuk k meng menguk ukur ur (men (menge geta tahu hui) i) suhu suhu (temperature) (temperature) pada %etering %etering Station, Station, temperature gauge dipasang di bagian bagian hilir do+n stream turbine meter. 12. 6olume 6olume :orr :orre+t e+tor or
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3. 2endata 2endata olume, olume, gunany gunanyaa untuk memba#a memba#a olume olume gas yang telah telah diukur olehmeter gas . Unit pengkore pengkoreksi ksi ("orektor ("orektor)) adalah unit unit yang yang melakukan melakukan perhitu perhitungan ngan koreksi dengan data dari ketiga bagian lain diatas dan menampilkan hasil perhitungan koreksinya. 3. Regulator
&egulator digunakan dari upstream (hulu) ke seris regulator domesti# dari transmisi ke stasion regulator distrik. &egulator digunakan untuk menurunkan tekana tekanan n yang yang masuk masuk untuk untuk menda mendapat patkan kan tekana tekanan n keluar keluar yang yang dibutu dibutuhka hkan. n. 2ressure regulator tidak hanya menurunkan tekanan tetapi !uga men!aga pada tekanan yang diingini. Fluktuasi dari inlet pressure terhadap regulator ale tidak mempengaruhi outlet pressure yang telah diset, pada saat tidak ada pemakaian,
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.
%easuring >lement $easuring
element
sangat
sensitif
terhadap
segala
perubahantekanan yangter!adi diba+ah (down down stream stream)) dan dan berf berfun ungs gsii seba sebaga gaii peng pengon ontr trol ol teka tekana nan n kelu keluara aran n ( pressure pressure output ), ) , bila bila ter! ter!ad adii perubahan tekanan elemen ini akan selalu bergerak pada posisi kesetimbangan(:*). $easuring element yang yang berb berben entu tuk k diap diaphr hrag agma ma digunakan pada sistem distribusi tekanan menengah dan tekanan rendah. *.
=oading >lement %oading diakib diakibatka atkan n
element
berfungsi
untuk
mela+an
gaya
yang
olehme olehmeasur asuring ing element element dan akan selalu selalu memban membandin dingka gkan n
se#ar se#araa otom otomati atiss gaya gaya yang yang timb timbul ul dari dari measuring measuring element element , !ika !ika gay gaya tersebut tidak seimbang antara loading element dengan measuring element
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posisi restricting restricting element element dalam membuka dan menutup lubang orifi#e sekaligus sekaligus !uga mengatur mengatur tekanan keluar keluar yang diinginkan. diinginkan. ila measuring element berub element berubah ah posisi lebih terangkat, maka restricting element akan akan ikut terangkat naik pula yang mengakibatkan tekanan keluar dan la!u alir gas akan turun men!adi ke#il (:3)
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I6. P;M5A=ASAN
2elayanan %'&S yang berada di $rea Surabaya. %elayani penyaluran gas ke berbagai pelanggan, dari pembangkit listrik, industri hingga rumah tangga. Dal ini menuntut %'&S yang tersedia harus sesuai dengan kebutuhan pelanggan, !ika kapasitas %'&S terlalu besar daripada seharusnya maka hal yang ter!adi adalah tidak efisiennya %'&S tersebut, yang seharusnya bisa dipakai untuk industri yang lebih membutuhkan kapasitas lebih besar, namun !ika kapasitas %'&S terlalu ke#il
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%engambil gas dari perusahaan penambang gas sebagai pemasok gas, gas yang diambil dari pemasok memiliki tekanan kurang lebih *; bar. ekanan tersebu tersebutt perlu perlu mele+a mele+ati ti meterin metering g and regula regulatin ting g statio station n untuk untuk dituru diturunka nkan n sesuai dengan kebutuhan dari pelanggan tersebut.2embagian tekanan tersebut adalah •
as dengan dengan tekanan lebih lebih dari 7 bar, langsung langsung menu!u menu!u pembangki pembangkitt listrik dan industri.
•
as dengan dengan tekanan tekanan lebih dari -7 -7 bar, menu!u menu!u pembangkit pembangkit listrik, listrik,
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Dal ini bertu!uan apabila regulator aktiftidak dapat beker!a dengan baik, regulator monit monitori oring ng akan akan mengga mengganti ntikan kanny nya. a. Dal ini perlu perlu dilaku dilakukan kan karena karena regula regulator tor adalah alat ital dalam operasi %'&S, 2ada 2ada stream stream operasi operasi,te ,tekan kanan an settin setting g pada pada regula regulator tor monit monitor*, or*,* * bar dan tekanan setting pada regulator aktif * bar.2erbedaan ini senga!a di#iptakan apabila ter!adi pressure drop karena penggunaan penggunaan berlebih sehingga tekanan men!adi men!adi , bar. &egulator pada stream stand byakan membuka lebih lebar sehingga dapat mensup mensuplai lai gas untuk untuk pemakai pemakaiang angas as yang yang melebi melebihi hi pemaka pemakaian ian pada pada kondis kondisii
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.2.1 Kom%onen Po#o# M/RS di PT Jang#ar Nusantara MegaMega-
@o * 3 6 7 8 9 ;
"omponen utama Insulating !oint inlet 2ressure gauge inlet all ale Filter 1ifferent pr pressure ga gauge Shut off ale &egulator monitor &egulator aktif &elief ale he#k ale
$da
idak
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%erk regulator 2 inlet maksimum 2 inlet minimum 2 outlet maksimum 2 outlet minimum 1iameter pipa inlet
: Fisher : ; bar : 7 bar : 6 bar : bar : * in#h
,$@SI 3;;
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;.9 s'd * 2 ? . 2? 2 ? .3 2 ? .6 *. s'd 6.; 2 ? . 2? 2 ? .3 2 ? . 6. s'd *6 2 ? .;6 2? 2 ? .6 2 ? .3 ontoh : "ebutuhan pelanggan adalah * bar, maka untuk stream aktif ekanan
Set point (ar) Slam
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•
1alam pelaksanaannya dapat disesuaikan dengan kebutuhan persyaratan keamanan operasional di 2elanggan (misalkan setting SS/0 sesuai dengan batas keamanan peralatan atau setting regulator di 2elanggan) 2enyesuaian yang diperlukan untuk ketentuan khusus dalam penyettingan
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(2erser (2ersero) o) bkter bkterdap dapat at berma# berma#am-m am-ma#am a#am,@am ,@amun un yang yang sering sering dipaka dipakaii oleh oleh 2 2erusahaan as @egara (2ersero) b adalah +in stream +ith monitor +in +in Stream Stream dapat diartik diartikan an : * (dua) (dua) la!ur la!ur yang yang identi identik k pada pada bagian bagian regulator module. %asing-masing la!ur dinamakan =a!ur 2eker!a (
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&egulator adalah alat utama pada %etering and &egulating Station. $lat ini digunakan dari upstream (hulu) ke seris regulator domesti# dari transmisi ke stasion regulator distrik. &egulator digunakan untuk menurunkan tekanan yang masuk untuk mendapatkan tekanan keluar yang dibutuhkan. 2ressure regulator
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