Bunkering vessel

A bunkering vessel for loading a liquefied gas to or unloading the liquefied gas from a liquefied gas storage tank of a target, comprising:

• a bunkering tank storing the liquefied gas;
• a manifold provided at a bunkering station of the bunkering vessel to flow in the liquefied gas to and flow out the liquefied gas from the bunkering vessel;
• a liquid phase transfer line transferring a liquefied gas in a liquid phase by connecting the bunkering tank and the manifold;
• and
• a gas phase transfer line transferring a liquefied gas in a gas phase by connecting the bunkering tank and the manifold,
• wherein the bunkering vessel supplies the liquefied gas through the manifold to the liquefied gas storage tank prepared at the target and receives a discharge gas from the target, and
• the bunkering vessel further comprising a liquefied gas vaporizer vaporizing the liquefied gas,
• wherein before loading the liquefied gas to the target, the liquefied gas vaporized at the liquefied gas vaporizer or a liquefied gas of a relatively small flow rate compared to a flow rate of the liquefied gas upon loading is supplied to the liquefied gas storage tank provided at the target through the manifold, and the discharge gas is received from the target, and
• wherein the liquefied gas vaporizer vaporizes a liquefied gas received from the bunkering tank or the liquefied gas storage tank and then supplies to the gas phase transfer line, and the discharge gas is a gas stored in the liquefied gas storage tank and then discharged when the liquefied gas vaporized at the liquefied gas vaporizer is injected into the liquefied gas storage tank.