The plant is the largest of its kind in the world and made Qatar the world's largest helium exporter.[1][48][49] In 2014 the construction for Laffan Refinery 2 began and the refinery delivered the first Diesel Hydrotreater (DHT). The Procurement and Construction contract (EPC) for the DHT with Samsung Engineering had been signed in 2012. The DHT is able to process 54,000 barrels of ultra-low-sulfur diesel fuel per stream day (BPSD) and was operated at 50% capacity until the Laffan Refinery 2 began production in 2016.[50][51] The first ship-to-ship transfer (STS) of LNG, following an incident with one of Qatargas' leased vessels in the straights of Singapore, was carried out in 2014.[52][53] Also, in 2014, Qatargas announced the successful start-up of the Jetty Boil-off Gas Recovery Project, which aimed to reduce flaring at the Ras Laffan LNG loading berths and was inaugurated in 2015.