Liquefied gas fuel feeding system and a method of operating a power plant of internal combustion engines powered with liquefied gas

A method of operating a power plant of internal combustion engines powered with liquefied gas, the method comprising:

• a) storing fuel in a gas container as liquefied gas and gaseous gas in cryogenic circumstances;
• b) detecting pressure in the container;
• and
• c) detecting a demand of fuel pressure of at least one of any running engines of the power plant, wherein:
• d) when the pressure in the container is higher than the demand of the fuel pressure of the engine, then feeding gaseous gas from the gas container to the engine via a first fuel passage opening into an ullage space of the gas container;
• and
• e) when the pressure in the container is lower than the demand of the fuel pressure of the engine, then supplying a flow rate of liquefied gas to a pump via a second fuel passage opening into a bottom section of the gas container, increasing pressure of the liquefied gas to at least a pressure equal to the demand of the fuel pressure in the pump and evaporating liquefied gas and feeding the evaporated gas to the engine;
• and
• f) repeating at least the steps c), d) and e) for each one of the engines running in the power plant, wherein
• a pressure demand information of each one of at least two engines is obtained and the first fuel passage or the second fuel passage is connected alternatively to each one of the at least two fuel delivery passages based on respective pressure demand information.