A system including: - at least one first chamber through which a first gas, which is a gas that is potentially wet, is able to flow; - at least one first supply line that is able to supply the inlet of the first chamber with potentially wet gas up to a maximum operating pressure P max, the first supply line comprising a first flow-rate regulator that is able to regulate the flow rate D H of the first gas between a zero value and a maximum value D H,max; - at least one second chamber through which a second gas, preferably air, is able to flow; - a seal-tight enclosure in which the first and second chambers are housed, and through which the same second gas is able to flow, the enclosure being able to operate under the pressure of the second gas up to the maximum operating pressure P max; - at least one second supply line that is able to supply the seal-tight enclosure and the inlet of the second chamber with the second gas, the second supply line comprising a second flow-rate regulator that is able to regulate the flow rate D O of the second gas between a zero value and a maximum value D O,max; - at least one outlet line that is able to exhaust the second gas from inside the seal-tight enclosure, said outlet line comprising a third flow-rate regulator that is able to regulate the flow rate D purge of the second gas between a zero value and a maximum value D purge,max; - pressure sensors (P H, P O) that are able to measure the pressure in each of the first and second chambers, between atmospheric pressure and the value of the maximum pressure P max; - at least two regulating valves (V H, V O) that are arranged outside the enclosure and on the outlet lines (26; 27) of the one or more first chambers and of the one or more second chambers, respectively, each valve being able to operate each at a temperature above the condensation temperature of the wet gas at the maximum pressure P max in question, each valve being able to be open from 0% to 100% and having a capacity K v suitable for the maximum pressure P max and for the average flow rate of the gas in question in each of the two outlet lines (26; 27); - means for heating the lines containing the wet gas to a temperature above the condensation temperature of this wet gas at the maximum pressure P max in question; and - commanding and automatically controlling means for commanding and automatically controlling the regulating valves (V H, V O) depending on differences in pressure values measured by the pressure sensors so as to obtain a minimum pressure difference between the one or more first chambers and the one or more second chambers. - at least one first chamber through which a first gas, which is a gas that is potentially wet, is able to flow; - at least one first supply line that is able to supply the inlet of the first chamber with potentially wet gas up to a maximum operating pressure P max, the first supply line comprising a first flow-rate regulator that is able to regulate the flow rate D H of the first gas between a zero value and a maximum value D H,max; - at least one second chamber through which a second gas, preferably air, is able to flow; - a seal-tight enclosure in which the first and second chambers are housed, and through which the same second gas is able to flow, the enclosure being able to operate under the pressure of the second gas up to the maximum operating pressure P max; - at least one second supply line that is able to supply the seal-tight enclosure and the inlet of the second chamber with the second gas, the second supply line comprising a second flow-rate regulator that is able to regulate the flow rate D O of the second gas between a zero value and a maximum value D O,max; - at least one outlet line that is able to exhaust the second gas from inside the seal-tight enclosure, said outlet line comprising a third flow-rate regulator that is able to regulate the flow rate D purge of the second gas between a zero value and a maximum value D purge,max; - pressure sensors (P H, P O) that are able to measure the pressure in each of the first and second chambers, between atmospheric pressure and the value of the maximum pressure P max; - at least two regulating valves (V H, V O) that are arranged outside the enclosure and on the outlet lines (26; 27) of the one or more first chambers and of the one or more second chambers, respectively, each valve being able to operate each at a temperature above the condensation temperature of the wet gas at the maximum pressure P max in question, each valve being able to be open from 0% to 100% and having a capacity K v suitable for the maximum pressure P max and for the average flow rate of the gas in question in each of the two outlet lines (26; 27); - means for heating the lines containing the wet gas to a temperature above the condensation temperature of this wet gas at the maximum pressure P max in question; and - commanding and automatically controlling means for commanding and automatically controlling the regulating valves (V H, V O) depending on differences in pressure values measured by the pressure sensors so as to obtain a minimum pressure difference between the one or more first chambers and the one or more second chambers.