values when it becomes Iow. This process typically consumes about 3% to 5% of the total gas transported in order to power the compressors (Herran-Gonzalez, et al. 2008).
Typical pipeline pressures rangę from 50 to 100 bar for distances over 100 km, 20 to 50 bar for distances over 20 km, below 10 bar for a distribution grid such as an urban area, and down to as Iow as 10 mbar at the consumer. This seąuence of decreasing pressures occurs in stages and is accomplished using regulator stations (Instromet INC). A simplified layout of a natural gas distribution network is shown in Figurę 2.2.
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