__Erosional Velocity of a Gas Pipeline__

### The
__gas velocity__ is directly related to the flow rate. As flow
rate increases, so does the gas velocity. As the velocity increases, vibration
and noise are evident. In addition, higher
velocities will cause erosion of the pipe interior over a long period of time.

The upper limit of the gas velocity is usually calculated approximately from
the following equation:

Erosional Velocity Formula

Where,

u_{max} = maximum or
erosional velocity, ft/s

ρ = gas density at flowing temperature, lb/ft^{3}

^{}

Since the gas density ρ

*may be expressed in terms of pressure and temperature, the maximum velocity can be rewritten as,*Where,

Z = compressibility factor of gas, dimensionless

R = gas constant = 10.73 ft

^{3}psia/lb-moleRT = gas temperature, °R

G = gas gravity (air = 1.00)

P = gas pressure,
psia

Usually, an acceptable operational velocity is 50% of the above.

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