All about Tangguh LNG
Tangguh LNG Facility
Helfia Nil Chalis July 2012
Tangguh LNG has two process trains. Train-1 and Train-2 have installed capacity of 3.8 million tons per annum each or 7.6 mpta total. Gas supply is taken from two platforms VRA and VRB. Both platforms located north of LNG site at Bintuni bay approximately 14 km from shore. VRA platform has 6 wells while VRB platform has 9 wells. Each well has installed capacity of 240 MMSCFD gas production. Each platform is connected to onshore receiving facility with 24" pipeline. Each pipeline has capacity of transporting gas at 1050 MMSCFD.
How much gas is required to feed both Train-1 and Train-2 at maximum rate? It is approximately 1,400 MMSCFD. In other word, one pipeline could supply 1.5 trains. Is there any minimum rate that we must keep through the pipeline? Yes, there is or otherwise an accumulation of hydrocarbon condensate might be formed in the pipeline in particular at the low points under the water, If we let this happens, the pipeline could be blocked by hydrocarbon condensate and gas could not be transferred through the pipeline any more.
The feed gas from both platforms is sent to Onshore Receiving Facility (ORF). There are two pig receivers, two hydrocarbon condensate separators, two units of condensate stabilizer, corrugated processing installation (CPI), and Produced Water Tank. The feed gas is then sent to Process Trains which is Train-1 and Train-2. Both trains are twins. The liquefaction process is using Air Products LNG Technology. The gas is first processed through Acid Gas Absorber, and then Dehydration, Mercury Removal, Fractionation, Refrigeration and finally Liquefaction. Each train has two Compressors, i,e, MR and Propane refrigeration compressors. The compressors are driven by combine cycle technology. The main driver is GE Gas Turbine Frame 7, with combination of steam turbine as helper at lower speeds.
Coming-out from process trains, Train-1 and Train-2 the gas has become LNG at temperature of -160 deg. C. It is sent into two LNG Storage Tanks waiting for shipments. Shipment frequency is approximately every two days. LNG is transferred from LNG Tanks using two LNG Loading pumps from each tank to the ship. Tangguh LNG only has one LNG Jetty with boil off gas recovery system. As side product Tangguh LNG also produces hydrocarbon condensate which is shipped every two weeks.
Utilities for supporting the whole site consists of three Siemens Steam Turbine Generators. Each has capacity of 35 MW. The steam is generated from three Macci Boilers at capacity of 120 tons per hour each. Water is taken from sea water using three Desalination units. Cooling system is mainly using air fan coolers. Utility is also processing produced water to meet the government regulations on water disposal.
Dormitory is built for site employees with total bed capacity of 320. This is apparently not enough, so several of construction housing are converted to provide accommodation to the rest of populations. Currently total persons on board are 1,700. The Administration office is located next to Dormitory. Still in the same area there are maintenance building and logistic warehouse.