Worldwide, there are 26 existing LNG export liquefaction terminals located in 15 countries. In contrast, there are 60 existing import or regasification terminals spread across 18 different countries. There are approximately 65 liquefaction marine terminal projects and approximately 181 regasification terminal projects that have been either proposed or are under construction around the world.
LNG is transported by specialized tankers with insulated walls, and is kept in liquid form by auto-refrigeration, a process in which the LNG is kept at its boiling point, so that any heat additions are countered by the energy lost from LNG vapor that is vented out of storage and used to power the vessel. These carriers are insulated to limit the amount of LNG that evaporates.
LNG carriers are up to 1,000 feet long and require a minimum water depth of 40 feet when fully loaded. In 2004, there were approximately 140 LNG ships operating worldwide.