<p>A method and a system for odorising a gas fed into a main pipe (1) leading from a distributor station to a user by means of a device (14) for injecting a liquid odorant contained inside a lapping tank (6), pressurised at the same pressure value as the pipe (1). The system is characterised in that the delivery of the liquid odorant to said injection device (14) is unaffected by the pressure of the gas inside said main pipe (1) or by the pressure inside said pressurisable tank (6).</p>
