PT Perta Samtan Gas | Fractionation Plant
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Fractionation Plant

PSGAS Process Summary

Perta Samtan Gas is designed to extract the optimum amount of natural gas liquids from a combination of gas sources at 250 MMscfd capacity available at the existing SKG-10 Prabumulih Barat gas metering station. An NGL Extraction Plant, which is located adjacent to the SKG-10 metering station, provides the means for extracting the natural gas liquids from the pipeline gases. Following extraction, lean (residue) gas is returned to the metering station and extracted liquids is transferred to a Fractionation plant which is located in the Pertamina Plaju / Sungai Gerong refinery, designation RU III at Palembang. A buried pipeline approximately 89.6kms in length transports the liquids to the refinery. At the refinery the liquid is fractionated and stored with ship loading facilities installed at an existing Jetty and transfer by pipe line to Dom Gas which is located at Plaju.

Metering Station (SKG-10)

The feed gas supplied to the NGL Extraction Plant is taken from two existing pipelines located in the adjacent SKG-10 gas metering station which are (1) 28a” Feed Gas Pipeline from SKG PPGS Benuang terminating at its pig receiver and (2)  20a” Feed Gas from SKG Musi terminating at its pig receiver. The feed gas  is transferred to vertical type Inlet Slug Catcher to separate free condensate and water from pipeline gases. The seperated feed gas as vapor is transfered to feed gas metering to measure actual feed gas volume and gas composition and the lean gas whcih comes from extraction plant is transferred to lean gas  metering at SKG-10 to measure lean gas volume.

Fractionation Plant Process

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.

* Main Equipment

1. FRACTIONATION SYSTEM Fractionation System is intended to produce propane and mixed LPG separately. This system comprises of the following main process comprises of the following main process
  1.1 Depropanizer:Fractionation of propane(C3) from NGL
  1.2 Debutanizer:Fractionation of butane(C4) and condensate(C5+) from residual liquid from depropanizer
  1.3 Static Mixer:Mixing the propane and butane then transferring to LPG tank
2. STORAGE & LOADING SYSTEMThe products processed is stored to each LPG tank and Condensate Tank
  2.1 LPG loading:The Mixed LPG in each tank is transferred to Jetty no.1 LPG loader loading to vessels and to Dom Gas
  2.2 Condensate loading:The Condensate is transferred to Jetty no,1 Condensate loader loading to vessels and to RU3

De-Propanizer Column

De-Propanizer Column & De-Butanizer Column

Function : Fractionation of Propan, Butan and Condensate from NGL

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

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