Singapore's BW LPG has called the fuelling of a VLGC with LPG a "milestone achievement".
The 84,195-cbm BW Gemini (built 2015) is the first such vessel to run on the gas.
The dual-fuel ship started a week-long sea trial on Wednesday, the Oslo-listed BW Group spin-off said.
The company said the BW Gemini’s retrofitted main engine has been able to use LPG and also switch to traditional fuel “seamlessly”.