Dela Agung Septriady
Sr. Spv Operation Facilities Planning
PT Pertamina Gas
16:30 - 17:00
Wednesday, 18 September 2019
T3.6 The Longest And The Most Challenging Subsea Pipeline In Indonesia
INSPECTING AND OPERATING EXTRAORDINARY EASTERN JAVA GAS PIPELINE (EJGP): The Longest And The Most Challenging Subsea Pipeline In Indonesia.
Indonesia has established themselves as an important supplier of natural gas both globally and particularly in the Asia Pacific throughout the years. a large amount of Indonesia’s natural gas production has been exported, however domestic consumption’s share of their natural gas production has also been on the rise. The Eastern Java Gas Pipeline (EJGP) is a national strategic asset that has important role to deliver gas on east java region. The EJGP consists of a 370 km, 28 inch diameter subsea pipeline which receives gas from central processing plant on Pagerungan Island and transports it to onshore receiving facility at Porong. It delivers about 280 million cubic feet of natural gas per day from Pagerungan Island to consumers located in East Java province. As Operator of open access Pipeline in Indonesia Pertamina Gas supporting the “gas highway concept” to attract more upstream player to explore new gas resource and utilize the infrastructure to monetize the discovered gas. Inspecting and operating become extraordinary since a lot off tie-in by the gas producer on the body of subsea pipeline. On 2012 company facing a great failure on Intelligent Pig Inspection because of backpressure (backflow). The pressure on the upstream pipeline lower than in the midstream where TSB Gas Field Operated by Kangean Energy Tie In On The Subsea pipeline. Long distance gas pipeline with extremely low flow rate from central processing plant until first tie in (TSB), low flow increasing drastically after the tie in causing the gas speed ~9 m/s, Extremely long hours inspection are the inspection challenges that company have to overcome. The need of Inspection getting high when in 2020 Pagerungan field will be abandoned due to natural decreasing of the gas. Not mention There are 29 freespans found along the East Java Gas Pipeline (EJGP) pipeline located in between KP 48 to KP 140 and between KP 193 to KP 233 Immediate rectification is required at these freespans to maintain the life of pipeline and to avoid damages. The Challenge become extraordinari since Indonesia located on the ring of fire, unlucky this pipeline cross one of the active thrust called Kendeng thrust. These thrust declared as an active thrust just in 2016 after Scientist found a new kinematic framework for active deformation in the eastern Sunda-Banda Arc. The declaration proves that on 11 Oct 2018 major earthquake happened on these thrust with magnitude 6.4. Unfortunatelty the center of the earthquake just only 20 km from East Java Gas Pipeline. This Paper will elaborate the condition of the longest and the most challenging subsea pipeline in Indonesia and how company overcome the situation in order to maintain the integrity of Pipeline.