On the boll

摘要

LNG carriers provide the link between the liquefaction terminal in the gas producing country where the gas is purified, liquefied, and stored prior to loading and the gas consuming country where the LNG is regasified prior to injection into the gas pipe system for distribution to consumers. On the carriers, the LNG is stored in a boiling state (-160℃) and slightly above atmospheric pressure in insulated tanks. Approximately 0.1 to 0.3% of the cargo vaporises each day and can be used as part of a dual-fuel propulsion system, relique-fied and sent back to the cargo, or burnt off. When the amount of vapour exceeds propulsion requirements the excess gas needs to be disposed of to maintain cargo tank pressure at acceptable levels.