Velocity of Gas in a Pipeline
The velocity of gas flow in a pipeline represents the speed
at which the gas molecules move from one point to another. Due
to compressibility, the gas velocity depends
upon the pressure and, hence, will vary along the pipeline even if the pipe diameter is constant. The highest velocity
will be at the downstream end, where the
pressure is the least. Correspondingly, the least velocity will be at the upstream end, where the pressure is higher.
u=upstream gas velocity, ft/s
Qb=gas flow rate,
measured at standard conditions, ft3/day (SCFD)
D=pipe inside
diameter, in.
Pb=base pressure,
psia
Tb=base
temperature, °R(460 + °F)
P=upstream pressure, psia
T=upstream gas temperature, °R(460 + °F)
Z= gas compressibility factor at upstream
conditions, dimensionless
Qb=gas flow rate, measured at standard conditions, m3/day (SCFD)
D=pipe inside diameter, mm.
Pb = base pressure, Kpa
Tb= base temperature, °K(273 + °C)
P= upstream pressure, Kpa
T= upstream gas temperature, °K(273 + °C)
Z= gas compressibility factor at upstream conditions, dimensionless.
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