Pipeline Basics
Pipeline Basics
(OP)
What is the relationship between pressure and velocity in a pipeline if any? Is the only reason for high pressures in gas pipelines to compensate for pressure drops?
Thanks,
Thanks,
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RE: Pipeline Basics
David
RE: Pipeline Basics
It should be obvious that, for a given fixed mass flow, as the flow pressure increases, the specific volume decreases and the resulting velocity decreases as well. Conversely, as the pressure decreases, the specific volume increases and so does the gas velocity. The latter effect is exactly what happens in a gas transport P/L. As the compressed gas travels downstream, it suffers pressure drop due to flow resistance and friction. Consequently, its velocity starts to increase as the pressure drops along its route.
High pressure is employed in P/Ls not only for allowing for pressure drop. It also adopts to the economic justifications for the P/L since the incentive is to transport as economically as possible. This has to do with the max. allowable pressure for the given pipe diameter and schedule.
RE: Pipeline Basics
High pressure costs money - not just in the compressor (gas) and pumps (liquid), but piping, fittings, valving, etc.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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