PT Perta Samtan Gas | Business Overview
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Operation Flow

PT Perta-Samtan Gas facilities are designed to extract the optimum amount of natural gas liquids from a combination of gas sources available at the existing SKG-10 Prabumulih Barat gas metering station. An NGL Extraction Plant, which will be located adjacent to the SKG-10 metering station, will provide the means for extracting the natural gas liquids from the pipeline gases. Following extraction, lean gas will be returned to the metering station and extracted liquids will be transferred to a Fractionation plant which will be located in the Pertamina Plaju / Sungai Gerong refinery, designation RU III at Palembang. A buried pipeline approximately 87kms in length will transport the liquids to the refinery. At the refinery the liquids are fractionated and stored with ship loading facilities installed at an existing jetty that will be refurbished as part of the project scope.

 

A flow scheme has been developed to process 250 MMscfd of feed gas, producing 546 M. tons/day of LPG, 225 M. tons/day of condensate and 160 M. tons/day of excess propane.

 

The extraction plant at Prabumulih Barat is designed to be totally self-reliant by necessity in the provision of all utility systems, with the only systems crossing the boundary fence, being the feed gas supply, the lean gas return, the NGL pipeline and a fuel gas start-up line.

 

At Plaju/Sungai Gerong refinery certain utility systems will be available for use in the fractionation plant and tie-ins to these utilities are included in the scope of work. Any other utility not provided by the refinery is to be provided as part of the scope of work.

 

Products to be shipped from the refinery will be mixed LPG, excess propane and condensate liquids for sales purposes. The design philosophy is to recover the maximum quantity of propane plus components by use of the UOP licensed a�?Ortloffa�? process technology and fractionate the mixed natural gas liquids to produce:

 

Feed Gas Composition [Design Basis]

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COMPONENT COMPOSITION (MOLE %)
Carbon Dioxide 3.609
Nitrogen 0.213
Methane 85.109
Ethane 5.284
Propane 3.395
i-Butane 0.671
n-Butane 0.809
i-Pentane 0.307
n-Pentane 0.168
n-Hexane 0.196
Heptane 0.156
Octane 0.071
Nonane 0.012
Decane 0.002
Total 100
H2O Assume water content is 14 lbs/MMscf

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Product Specification

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  • Propane
Maximum RVP at 100A�F : 200 psig
Maximum Outlet Temperature : 120A�F
Water Content : No Free Water
Corrosivity : 1 Copper Strip (prefer 1A)
Total Sulfur : 15 grains/cu.ft.max. (ASTM-D784)
Composition:    
  C2 : < 0.3 % vol
C3 : > 96.0 % vol
C4 : < 4.0 % vol
C5 + : Nil

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At the Fractionation Plant, NGL will be purified through De-Propanizer chamber to become Pure Propane (C3) and De-Butanizer chamber to become Butane (C4) and then mixed by static mixers, known as Mixed Liquid Petroleum Gas (Mixed LPG) stored in the storage tank 2×1.000 MT and 2×2.000 MT capacity and Condensate (C5+) are stored in a storage tank with capacity of 25,000 Barrel and transferred through a 1.2 km long pipeline to the ship unloading facility at the existing dock and 4,2 km long Mix LPG pipeline to Pulau Layang (Gasdom) for stocking needs of Southern Sumatra (Palembang, Jambi, Bengkulu, Lampung, Bangka Belitung). At the Fractionation Plant in Banyuasin, certain utilities system such as electricity supplied by Refinery Unit III PT Pertamina (Persero) with a capacity of 900 kW equipped with two (2) units of 6.6 kV transformers. Products from the LPG refinery is mixed LPG. NGL is processed through the De-Propanizer and De-Butanizer column to be a pure Propane (C3) and Butane (C4). Mixed LPG then kept stored in the storage tank 2×1.000 MT and 2×2.000 MT capacity, while condensate (C5+) are stored in a condensate storage tank 25,000 Barrel capacity. The LPG products are transferred through a 1.2 kilometer long pipeline in the Jetty – 1 to be sent outside Palembang, while for Palembang demands sent through 4.2 km pipelines to Pulau Layang (Gasdom), for Palembang, Jambi, Bengkulu, Lampung and Bangka Belitung.

De-Propanizer Column

De-Propanizer Column & De-Butanizer Column

Function : Fractionation of Propan, Butan and Condensate from NGL

Capacity
De-Propanizer : 23.3 t/h
De-Butanizer : 9.3 t/h

LPG Storage Spheres

LPG Storage Spheres

Function : LPG Storage

Capacity : 6,000MT (4 units)
Tank No.1,2 : 2,000MT x 2 units
Tank No.3,4 : 1,000MT x 2 units

Condensate Storage Tank

Condensate Storage Tank

Funtion : Condensate Storage

Capacity : 25,000 BBL

LPG & Condensate Loader

LPG & Condensate Loader

Function : Shipment of LPG & Condensate in Jetty

Capacity
LPG Loader : 224~636 m3/h
Condensate Loader : 318~636 m3/h

The Extraction facilities located in West Prabumulih is designed to extract the optimum amount of NGL from the combination of source gas at a capacity of 250 MMSCFD that available in Gas Compression Station 10 (SKG-10) in West Prabumulih. The NGL extraction plant, provide the means to extract NGL from gas pipeline. Extraction lean (residue) Methane gas (C1) and Ethane (C2) with the De-Ethanizer returned to the metering gas station and NGL extraction (Propane/C3, Butane/C4, Condensate/C5+) are transferred to the Fractionation plant that located in Refinery Unit III Pertamina Plaju/ Sungai Gerong, Banyuasin. NGL pipeline size 8 inches installed around 89.6 km long to transport NGL from Extraction Plant to Factionation Plant. NGL Extraction Plant in Prabumulih is designed to be self-sufficient by necessity in the provision of all utility systems, one and only across the line system, being feed gas supplier, back to lean gas, NGL pipelines and fuel gas track, and has gas power generator facilities with capacity of 3×725 kW and 1 unit emergency diesel generator with a capacity of 537 kW. NGL Extraction Plant in Prabumulih located next to PEP-SBSa�� gas metering station SKG-10, provides facilities to extract NGL from gas pipeline from PEP gas field in South Sumatra. The exhaust Methane (C1) and Ethane (C2) gases that is not drawn through De-Ethanizer process returned as a gas to gas metering station, whereas Propane/C3, Butane/C4, Condensate/C5+ is transferred to the Fractionation Refinery located in Refinery Unit III Sungai Gerong in Palembang by NGL pipelines size 8 inches A� 90 km long.

GAS ENGINE GENERATOR

GAS ENGINE GENERATOR A/B/C (01-G-5401 A/B/C)

As a power plant equipment and electricity distribution at Extraction refineries/plant. Capacity 725 kwh/GEG

GAS TURBIN COMPRESSOR FEED

GAS TURBIN COMPRESSOR FEED, LEAN & COMMON A/B/C (01-K-2101/2301 A/B/C)

Increase feed/lean gas pressure. For Feed gas from 420 Psig to 795 Psig, Lean gas from 270 Psig to 521 Psig. Capacity Feed Gas Compressor 125 MMSCFD/Compressor, Lean Gas Compressor 117,5 MMSCFD/ Compressor.

DEHYDRATION VESSEL

DEHYDRATION VESSEL (DHU) (01-V-2201 A/B/C)

The separation of water from gas content and regeneration process. Capacity = 250 MMSCFD

REGENERATION GAS HEATER

REGENERATION GAS HEATER (01-H-2201)

To heating the regeneration gas (Lean Gas) before entering into dehydration vessel (DHU).

HOT OIL HEATER

HOT OIL HEATER (01-H-5701)

To heating Hot Oil before being used as a heater in Reboiler De-Ethanizer.

TURBO EXPANDER

TURBO EXPANDER (01-K-3301)

To decrease Feed Gas pressure before entering to De-Ethanizer Column from 720 Psig – 210 Psig

DE-ETHANIZER COLUMN

DE-ETHANIZER COLUMN (01-C-3401)

To seperate light fraction C1-C2 (Lean Gas) from weight fraction C3-C6+ (NGL) using the extraction principle.

NATURAL GAS LIQUID PUMP

NATURAL GAS LIQUID PUMP (01-P-3501 A/B)

To deliver Natural Gas Liquid as a bottom product De-Ethanizer Column to Fractionation Plant, Sungai Gerong over the underground pipeline. Capacity = 350 USGPM

DE-ETHANIZER REFLUXS PUMP

DE-ETHANIZER REFLUXS PUMP (01-P-3401 A/B)

Transfer fluida from Top De-Ethanizer Column to be return into De-Ethanizer Column in order to increase recovery. Capacity = 335 USGPM

HP FLARE STACK

HP FLARE STACK (01-ST-6401)

To burn exhaust gas of the process so as not to be exposed directly to environment. Capacity = 250 MMSCFD