Shipbuilders have received invitations to tender for the world’s first ice-breaking LNG carriers.Yards have been asked in the last few days to submit offers for up to 16 LNG vessels of around 170,000-cbm that will be used to ship cargoes from Novatek and Total’s Yamal LNG project in the Russian Arctic sources said. The vessels required are understood to be double acting ice-breaking ships to be built to the Russian Maritime Register’s Arc7 ice-class specifications.