Noise radiates from sources in the compressor station piping and piping flow disturbances which enact pressure wave reflections. Sound is produced by fully developed flow at high velocities through turbulence and may also be caused by reflections from partially developed flow from elbows, tees, valves, and other typical piping variations. The flow will produce a certain level of noise from turbulence but will also cause the pipe wall to vibrate and produce additional noise. Noise will be amplified at resonant conditions. The most common noise source is due to turbulent flow in a straight run of pipe. This tends to be relatively low in magnitude but will still manifest itself as ambient noise, as a function of the noise transmission through the pipe wall.
In acoustics, transmission loss is commonly defined as the loss in acoustic energy as pressure waves are reflected and transmitted across a medium. In this case, the medium is typically steel pipe surrounded on either side by two fluids: pressurized gas on the inside of the pipe and ambient pressure/temperature air on the outside of the pipe. The ratio of the intensities of the reflected and transmitted pressure waves depend on the acoustic impedances, the speed of sound and the angles of incidence. The transmission loss is a more difficult quantity to characterize when the acoustic impedances on either side of the pipe wall differ, as in this case, and when the internal fluid’s impedance varies throughout the piping network.
Noise radiates from sources in the compressor station piping and piping flow disturbances which enact pressure wave reflections. Sound is produced by fully developed flow at high velocities through turbulence and may also be caused by reflections from partially developed flow from elbows, tees, valves, and other typical piping variations. The flow will produce a certain level of noise from turbulence but will also cause the pipe wall to vibrate and produce additional noise. Noise will be amplified at resonant conditions. The most common noise source is due to turbulent flow in a straight run of pipe. This tends to be relatively low in magnitude but will still manifest itself as ambient noise, as a function of the noise transmission through the pipe wall.In acoustics, transmission loss is commonly defined as the loss in acoustic energy as pressure waves are reflected and transmitted across a medium. In this case, the medium is typically steel pipe surrounded on either side by two fluids: pressurized gas on the inside of the pipe and ambient pressure/temperature air on the outside of the pipe. The ratio of the intensities of the reflected and transmitted pressure waves depend on the acoustic impedances, the speed of sound and the angles of incidence. The transmission loss is a more difficult quantity to characterize when the acoustic impedances on either side of the pipe wall differ, as in this case, and when the internal fluid’s impedance varies throughout the piping network.
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