Gas supply system for high- and low pressure gas-consuming devices and method for controlling such a system

A gas supply system of at least one high-pressure gas-consuming device and at least one low-pressure gas-consuming device for a floating structure comprising at least a tank configured to contain the gas at least in liquid state, wherein the gas supply system comprises:

• at least a first gas supply circuit for the high-pressure gas-consuming device,
• at least a high-pressure evaporator configured to boil off the gas that flows through the first gas supply circuit,
• at least a second gas supply circuit for the low-pressure gas-consuming device comprising at least a compression device configured to compress some gas removed from the tank in vapor state up to a pressure that is compatible with the needs of the low-pressure gas-consuming device,
• at least a gas return line connected at the second supply circuit downstream from the compression device and extending to the tank,
• at least a first heat exchanger and a second heat exchanger, wherein each of them is configured to implement an heat exchange between the gas flowing through the return line and the liquid-state gas flowing through the first gas supply circuit,
• wherein the gas supply system comprises at least a cooling branch for the gas removed in vapor state from the tank connected to the second supply circuit upstream from the compression device, wherein the gas supply system comprises at least one thermal exchanger configured to implement a heat exchange between the vapor-state gas through the cooling branch and the liquid-state gas through the first supply circuit.