An analysis of the acoustic behavior of a vent silencer designed for a natural gas transport pipeline is performed, using finite volume computational tools such as harmonic response and harmonic acoustics, to find the operating frequency range in which the greater noise reductions for the system. From the results of the sound pressure level profiles, the transmission losses of the system, the amplitude level of the noise presented in the vent silencer was obtained. noting that for a frequency range of 500 to 1500 Hz a noise reduction of 140 dB is obtained