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Title: Turbulence And Its Effect In Measuring And Regulating Stations
Author: Mike Mckay
Source: 1991 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1991
Abstract: For several years gas men have been giving more thought to aerodynamic turbulence within their pipeline systems and, in particular, the turbulence that is a result of pressure regulation. Considering the noise from a measurement or regulating station, it is generally conceded that measurement facilities alone will rarely be a major source of noise, since we can design the pipe to give a desired and normally tranquil velocity. On the other hand, we must expect that in a regulator station control of the gas velocity Is possible only up to the inlet side of an active regulator. At the point of regulation within the regulator body, the velocity of the gas may be expected to increase greatly, perhaps up to sonic velocity. Now the question becomes, What is Che best way to handle gas when it is traveling at high velocities? Notice that there will be two distinct sources for noise in a regulator station. One is the control valve Itself and the other is from the piping downstream of the control valve. In order to develop a good basic knowledge of turbulence, it becomes necessary to understand the mechanics of it. Turbulence is the part of the flowing medium that is traveling in a direction that is in opposition to the main flow path. For instance, a vortex is a flow pattern that is sometimes perpendicular to Che main path, sometimes turned back toward the source and ac other times impinging directly into the main path. If you think that this can cause trouble, you are correct. Impingement of gas traveling at high speed is another problem and an additional source of noise.

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