Piping
Systems
Equivalent length key pipe
components
Singularity coefficient key
pipe components
Partially filled pipe
Sonic Velocity
Valves types
Valves Cv
Control valve sizing for
gases
Pressure safety valves
Colebrook correlation
Churchill correlation
Velocity in pipes
Flow regimes
Orifice calculations

1. Introduction
Calculating the sonic velocity
is necessary for different design activities. It is also
handy to be able to determine under which pressure drop a
gas flow will reach sonic conditions.
2. Sonic Velocity Calculation
V_{s} = (K g R T)^{0.5}
With :
V_{s} = Sonic velocity (ft/s)
K = C_{p}/C_{v} around 1.4 for most diatomic
gases
g = 32.2 ft/s^{2
}R^{ }= 1544 mol^{
} T = Absolute temperature (°R)
3.
Critical pressure ratio
[2/(K+1)]^{K/(K1)}
K = C_{p}/C_{v} around 1.4 for most
diatomic gases
Source
[1] Rules of Thumbs for Chemical Engineers,
Brannan, Gulf, 2005
