PTSC SEA, established in 2011, is a joint venture between PTSC and Yinson Holdings Berhad (YINSON), to invest and supply FSO PTSC Bien Dong 01 to Bien Dong Petroleum Operating Company (Bien Dong POC) for the operation in Hai Thach – Moc Tinh Fields, Block 05.2 & 05.3 in the Nam Con Son Basin offshore Vietnam, contract starting since June 2013.