Idrus, Muhamad Amril (2017) Risk Assessment Offloading Kapal FLNG ke Kapal Shuttle Tanker. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Floating Liquefied Natural Gas (FLNG) adalah bangunan terapung yang
berfungsi sebagai fasilitas eksploitasi, produksi dan pencairan gas alam. LNG
dicairkan dengan suhu -160 °C pada tekanan 14,7 psi sehingga volumenya
tereduksi 1/600 fasa gas. FLNG memerlukan proses transfer, untuk memindahkan
LNG ke kapal shuttle tanker. penelitian ini melakukan identifikasi bahaya,
penilaian risiko, mitigasi dan rekomendasi terhadap sistem transfer offloading
kapal FLNG. Identifikasi bahaya menggunakan Hazard Identification (HAZID)
dengan membagi sistem transfer untuk memudahkan proses identifikasi bahaya.
Initiating event komponen diperoleh dari data process release frequencies untuk
perhitungan Fault Tree Analysis (FTA) sedangkan data ignition probabilities
digunakan untuk mendapatkan frekuensi kegagalan setiap skenario pada
perhitungan Event Tree Analysis (ETA), kedua data tersebut berasal dari
International Association Oil and Gas Producers (OGP) Standard. Analisa
konsekuensi menggunakan fire modelling pada tiap skenario. Risiko akan
direpresentasikan ke dalam f-N Curve yang mengacu pada UK HSE Standard.
Analisa frekuensi dan konsekuensi dilakukan pada kebocoran 50 mm, 100 mm
dan 200 mm pada skenario jetfire, gas dispersion, flash fire dan explosion, untuk
mengetahui frekuensi (f) dan korban (N) pada setiap skenario. Pada skenario
jetfire pada sub-sistem Storage & Loading kebocoran 50 mm berada pada area
ALARP, dapat dilakukan mitigasi dengan mengurangi nilai frekuensi atau
konsekuensi, atau menjaga nilai frekuensinya dengan perawatan berkala dan
menggunakan komponen berkualitas agar risiko tidak naik ke area Intolerable.
Sedangkan skenario lainnya berada pada daerah Acceptable, dimana kondisi risiko
pada fasilitas offloading kapal FLNG dapat diterima.
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Floating Liquefied Natural Gas (FLNG) is a floating structure which has main
function as an LNG production, liquefaction, storage and offloading. The natural
gas will be liquified at -160 oC and at pressure of 14.7 Psi until the volume
decreased to 1/600 of its gas phase. FLNG requires cargo transfer process, in
order to transfer the LNG from the FLNG storage tank to the cargo containment
space of the shuttle tanker. This research has been conducted in a sequence of
hazard identification, risk assessment, mitigation and recomendation of the LNG
offloading transfer system. The hazard identification was carried out by HAZID
method, in which the cargo offloading system was divided into several subsystem
in order to simplify it. Initiating event for the components is obtained by means of
analysis from the release process frequencies fault treen analiysis (FTA)
calculation and ignition probablities used to get failure frequency to calculate
event tree analysis (ETA) each scenario, both of data is derived based on the
Standard Association Oil and Gas Producers (OGP). The consequence analysis
was carried out by fire modelling of several leakage scenarios. The result of
frequency and consequence analysis was then plotted in f-N Curve which refer to
UK HSE Standart. Several simulations were conducted at a leakage scenario of
50 mm, 100 mm and 200 mm in the form of jetfire modelling. Gas dispersion, as
well as flash fire and explosion, to know frequency (f) and casualty (N) for each
scenario. This research found that the jetfire scenario in subsystem storage and
offloading by leakage of 50 mm attained at As Low As Reasonably Practicable
(ALARP) zone, and some mitigation efforts was then required by reducing the
frequency or censequence or at least by maintaining the level of the frequency, for
example: by conducting scheduled maintenance or using high quality component
in order to prevent the risk not to shift to Intolerable Area. The other scenarios
are eventually arrived at Acceptable zone, where the risk of the FLNG Ship
offloading facility can be technically accepted.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTKe 623.823 5 Idr r |
| Uncontrolled Keywords: | FLNG, Risk Assessment, FTA, Fire Modeling, dan f-N Curve |
| Subjects: | V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis |
| Depositing User: | Mr. Fandika aqsa |
| Date Deposited: | 21 Jun 2017 02:18 |
| Last Modified: | 21 Jun 2017 02:18 |
| URI: | http://repository.its.ac.id/id/eprint/41780 |
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