Satu Aja Cukuplah Sudah

7/30/2019 Satu Aja Cukuplah Sudah

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(Proces

Peristiw

atau OI

kegiatankali ini

crude oiltidak sa

pompa t

Sambil

maka sa

Saya m

Pompa

umpannmentah

keluaran

minimutersebut

balik keakan m

arasmentah

FPSO.

s) Satu Aj

ini terjadi

. Setiap

productioetika Field

transfer plah unit C

ersebut?enunggu

ya keliling

lihat kira-k

entransfer

a daricondensat

pompa d

pompakurang da

vessel akanutup. Ke

cairan dcondensat

a Cukupl

sekitar di

ari Jumat,

dan mainMaintenan

ump unit A,uga meng

MS membe

latform.ira beginila

minyak (cr

surge ve+produced

ipasang m

ebagai prri setting p

membukaudian di d

i surge+produced

h Sudah

tahun 201

offshore

enance sece Supervi

padahal blami hal y

rikan sejar

process fl

ude oil tra

ssel. Powater me

ter jenis

teksinya (oint, maka

. Dan jika lwnstream

vessel.water ke

, tahun te

elakukan

inggu keor (FMS)

aru saja keang serupa

h record

w diagram

sfer pump

pa menglalui pipa

orifice yan

supaya tidflow contr

aju alirnyaya terdapa

Keluarmudian di

rakhir saya

weekly m

depan. Adermaksud

marin ada. Ada apa

aintenanc

nya:

digerakka

alirkan c menuju

berguna

ak vibrasi)l valve (F

di atas sett LCV yang

dari Lompakan

menjadi K

eting untu

yang meakan mem

vibrasi di ugerangan

di semua

n oleh mot

iran catangki min

untuk me

. Jika lajuV) di pipa

ingnya, maberguna u

V, cammenuju ta

epala Lapa

meng-up

arik di meeriksa vibr

nit B, dandengan po

crude oil p

r listrik de

puran miak di FPS

gukur laj

alir camyang men

ka FCV tertuk memel

uran mingki miny

ngan

-date

etingsi di

alaumpa-

ump,

ngan

nyak. Di

alir

uranarah

ebutihara

nyakk di


2/6

Saya mengamati bahwa pompa yang beroperasi ternyata dua buah pompa ..dan FCV yang

mengontrol minimum recirculation pumpnya tidak stabil, buka dan nutup silih berganti.

Maka saya bertanya kepada Field Production Supervisor (FPS) tentang laju alir liquid yangdipompakan selama ini.Laju alir liquid yang dipompakan ternyata sekitar 7,000 bpd!! Sedangkan kapasitas pompa

masing-masing sekitar 16,500 bpd. Kalau dua pompa berarti (apakah 2 x 16,500 bpd?Kalau ini jawaban anda, maka anda salah karena laju alir pompa tunggal atau yangdiparalel atau yang diseri itu ditentukan oleh titik perpotongan antara kurva pompa dengan

system headnya dan bukan dengan perhitungan matematika sederhana !!).Anyway, kita tidak fokus ke sana, namun fokus ke masalah ini. Lalu saya memerintahkanFPS untuk mematikan satu pompanya. Banyak macam alasannya untuk tidak jadi

menutupnya, salah satunya adalah takut shutdown.Kalau shutdown satu saja, maka leveldi surge vessel akan cepat naik dan intervensi operator mungkin telat. Saya menduga,

operasi seperti ini memang sudah sedemikian lama sehingga agak susah untuk merubahmind set. Anyway, this is the beauty to be the Boss, so mereka harus tetap patuh.

Singkatnya, satu pompa pun dimatikan..Malam harinya, karena sedikit curiga, saya turun lagi ke process area, dan mendapatkanpompa tetap satu yang beroperasinamun kenapa FCVnya nol? Ternyata setting minimum

flownya diubah ke 0 bpd. Waduh.Saya panggil lagi FPS dan minta supaya harga setting FCV-nya tidak dikutak-katik karenaada alasan engineering kenapa di set dengan angka demikian. Shift malam beralasan

mereka melihat FCV-nya tidak stabil dan ketika dipaksa nutup, semua system jadi terlihat

stabil.Saya pun kemudian menulis surat kepada Jakarta:To: Technical I ntegrit y Manager

cc: Process Engineercc: Rotat ing EngineerPaks,

The three crude oil transfer pumps P-84 00 A/ B/C were installed in parallel with curr entpractice: two pumps are in operation and one pump is in standby. Each pum p capacity was

480 gpm (16,457 bpd) at 82 psig differential pressure. That number was located on bestefficiency points of the pump (see pumps curve attachment). Each pump is vertical

centrifugal type driven by an electrical motor with capacity about 40 bhp.

To protect pump damage from low flow, a by-pass line from pumps discharge to suction

line had been installed with capacity of 8,000 9,000 bpd. This capacity is limited by Flow

control valve (FCV) on the line per data sheet (on attachment). The 8,000 9,000 bpdcorresponding to 54% of best efficiency points (BEP) of the pump and refer to several

centrifugal pumps article (by Igor Karassik on Chemical Processing Magazine), that issufficient (see attachment), and also considered appropriate for high suction specific speed

(Nss) t ype pum p. P-8 400 A/ B/C pumps have Nss of 11,42 0 and categorized as high Nss


3/6

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4/6

2. Subject to cost benefit analysis, Jakarta engineer to strongly consider reviewing current

pump design vs field liquid production and recommending lower capacity pump for energyefficiency and for reliability of the pump itself. 3. During study , OIM noticed that several production technician sounds did not

understand the function of minimum circulation protection for centrifugal-type pump and

this raise a worry since it was found at one day by OIM, the minimum circulation pumpsetting was changed to zero bpd. Request to Jakarta engineer to give a short course atoffshore for production technicians about centrifugal pump principle operation and its

control.

Dari maintenance data history, maka saya mulai mengerti akan seringnya pompa-pompatersebut terkena vibrasi. Dan juga mengerti kenapa terkadang mereka overload (karena

check valve-nya passing sehingga terjadi close recirculation thru other pump). Sekarang,setelah dua tahun berlalu dan saya pindah ke Jakarta, saya sudah jarang mendengar

pompa-pompa tersebut harus dioverhaul karena vibrasi, etc. I think, change philosophy tobe only one pump running - is working - meski harus dievaluasi lagi karena laju produksi

minyak yang terus menurun.Crud e Oi l Pum p A Main tenan ce H isto r y S ince 200 6 NGX10-16xx 29 Jun 2010 REPLACE CRUDE OIL TRANSFER PUMP A DUE TOLEAK ON MECHANICAL SEAL NOPLANNGX09-33xx 08 Mar 2010 REPAIR CHECK VALVE OF CRUDE OIL TRANSF PUMP

"A" DUE TO NOT WORKING PROPNGX10-04xx 05 Feb 2010 TROUBLESHOOT CRUDE OIL TRANSF PUMP-A, DUE TO

CHECK VALVE PASSINGNGX09-10xx 01 May 2009 CHECK AND REALIGNMENT CRUDE OIL TRANSFERPUMP "A" DUE TO VIBRATIONNGX08-41xx 28 Jan 2009 REPLACE 6" CHECK VALVE ON CRUDE OIL TRANSFERPUMP'A.NGX08-18xx 27 Aug 2008 INSTALL PUMP OF CRUDE OIL TRANSFER PUMP "A"NGX08-17xx 27 May 2008 FIX LEAK CRUDE OIL TRANSFER PUMP 'ANGX08-05xx 18 Feb 2008 CHECK CRUDE OIL PUMP-A DUE TO BREAKER TRIPNGX07-16xx 19 Jun 2007 INSPECT 8" CHECK VALVE CRUDE OIL PUMP A & CNGX07-07xx 21 Mar 2007 CHECK AND DISMANTLE CRUDE OIL PUMP "A"NGX06-26xx 25 Jul 2006 REINSTALL CRUDE OIL TRANSFER PUMP'ANGX06-13xx 03 May 2006 OVERHAUL CRUDE OIL TRANSFER PUMP UNIT A


5/6

Crud e Oi l Pum p B Main tenan ce H isto r y S ince 200 6 NGX10-xx27 18 Sep 2010 CHECK CRUDE OIL TRANSFER PUMP "B" DUE TOHARD NOISYNGX09-xx20 01 Oct 2009 TROUBLESHOOT CRUDE OIL TRANSFER PUMP B DUE

TO TRIPNGX09-xx18 13 Jun 2009 REALIGNMENT CRUDE OIL TRANSFER PUMP "B"NGX09-xx81 26 May 2009 REPLACE CRUDE OIL TRANSFER PUMP "B"NGX09-xx82 25 May 2009 CHECK/INSPECT CRUDE OIL TRANSFER PUMP "B",

DUE TO HIGH VIBRATIONNGX08-xx94 28 Jan 2009 REPLACE 6" CHECK VALVE ON CRUDE OIL TRANSFER

PUMP "B"NGX08-xx33 31 May 2008 TROUBLESHOOT ON CRUDE OIL TRANSFER PUMP "B"

DUE TO HIGH AMPS.NGX08-xx39 06 May 2008 CHECK CRUDE OIL TRANSFER PUMP MOTOR DUE TOHIGH VIBNGX08-xx00 26 Apr 2008 CHECK AND REPAIR CRUDE OIL TRANSFER PUMP B

DUE TO TRIPNGX08-xx27 22 Feb 2008 REPLACE CRUDE OIL TRANSFER PUMP B.Crud e Oi l Pum p C Main ten ance H is to ry S ince 2006 NGX10-14xx 17 Jun 2010 CHECK CRUDE OIL TRANSFER PUMP UNIT 'C DUE TOVIBRATIONNGX08-27xx 29 Sep 2008 CHECK IMPELER OF CRUDE OIL TRANSFER PUMP'CNGX08-29xx 27 Aug 2008 REPLACE CRUDE OIL TRANSFER PUMP'C.NGX07-16xx 19 Jun 2007 INSPECT 8" CHECK VALVE CRUDE OIL PUMP A & CSelesaiCahyo HardoVivat Process EngineeringReferensi:


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Anoa Operating Manual Premier Oil Natuna Sea B.V.Centrifugal pump operation at off-design conditions 3 series articles by Igor J. Karassik,

Chemical Processing.

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Satu Aja Cukuplah Sudah