BW LPG on Thursday announced it has agreed to acquire 12 very large gas carriers (VLGC) from Avance Gas in a cash and stock deal valued at more than $1 billion.The deal will see Avance Gas sell off the entirety of its VLGC fleet, including four 91,000-cubic-meter (cbm) vessels built in South Korea in 2022 and 2023 and eight 83,000-cbm vessels built in China in 2015