__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.

__The gas velocity at any point of a pipeline is as follows in USCS Units:__u=upstream gas velocity, ft/s

Q_{b}=gas flow rate,
measured at standard conditions, ft^{3}/day (SCFD)

D=pipe inside
diameter, in.

P_{b}=base pressure,
psia

T_{b}=base
temperature, °R(460 + °F)

P=upstream pressure, psia

T=upstream gas temperature, °R(460 + °F)

Z= gas compressibility factor at upstream
conditions, dimensionless

__The gas velocity at any point of a pipeline is as follows in SI Units:__Q

_{b}=gas flow rate, measured at standard conditions, m

^{3}/day (SCFD)

D=pipe inside diameter, mm.

P

_{b}= base pressure, Kpa

T

_{b}= 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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