Train Facilities

THE ARUN FIELD FACILITIES
Proven reserves of the Arun gas field supply 6 LNG trains, each with a capacity of 8 million cubicmeters of feed gas per day. The gas field has 4 clusters of producing equipment. Each cluster has 16 producing wells with cooling and separating facilities.
A portion of the gas produced from the Arun gas field is re-injected back into the reservoir. Natural gas liquids (NGL) are extracted from the re-injection stream.
Separation of the NGL mixture into propane, butane and condensate is done at the Arun plant LPG facilities.

THE ARUN LNG PLANT
  1. Receiving facilities: The gas and liquids are re-combined prior to being processed into LNG and condensate.
  2. Condensate recovery facilities: The first step is to separate the gas from the liquid condensate by passing a condensate stream through 2 stages of separation at successively lower pressures. The condensate is stabilized in a tower with a fired re-boiler, cooled and sent to storage. The stabilized condensate is ready for market as refinery or petrochemical feed stock. Off-gas from the stabilizer and from the low pressure separator is re-compressed to join the main feed of gas stream to be treated and liquified into LNG.
  3. Feed gas preparation facilities: Impurities in the gas must be removed prior to liquefaction. Trace amounts of mercury are removed from the feed gas. Carbon dioxide and hydrogen sulfide are removed in a treating unit containing carbonate and amine solution('Benfield' Treating Process). Water vapor is also removed. Heavy hydrocarbons are extracted by fractionation in a scrub tower.
  4. Liquefaction facilities: Liquefaction takes place in specially constructed heat exchanger which uses a multi component refrigerant (MCR) consisting of nitrogen, methane, ethane, and propane. The MCR is used to liquify the natural gas. The MCR is cooled by a propane refrigeration system. The propane refrigeration system us cooled by a seawater cooling system.
  5. Storage, loading, and shipping facilities: The liquefied gas, now at minus 160 degrees centigrade and reduced to 1/600th of its gaseous volume, is stored in specially constructed insulated storage tanks. These storage tanks have an inner shell of 9% nickel steel to withstand these low temperatures, and an outer carbon steel shell. The Arun LNG plant has 5 storage tanks with a capacity of 127.200 cubic meters each. LNG is loaded onto specially designed vessels in about 12 hours.
    6. The Blang Lancang harbour is 14 meters deep and is designed for ships of 80.000 DWT. The harbour has 2 berths to accommodate ocean sailing LNG tankers, most of which hold approximately 125.000 cubic meters of LNG. The LNG Plant has 4 condensate storage tanks (floating roof design). Each with a capacity 0f 530.000 barrels. The condensate is loaded onto tankers using a multi buoy mooring facility for 30.000 - 10.000 DWT tankers or single point mooring facility for up to 28.000 DWT.