How to calculate velocity in m/s from gas/oil flow in pipelines, in differant units of flow?

Convert to volumetric flow in m3/s, then divide by the pipe cross sectional area.


Mass flow in kg/s can be converted to volumetric flow by dividing by the density in kg/m3.How to calculate velocity in m/s from gas/oil flow in pipelines, in differant units of flow?
There are typically two different formulations of the equations; one applies to incompressible flow and the other applies to compressible flow.





v(squared)/2 +gh + pressure/density = constant





[edit] Incompressible flow


The original form, for incompressible flow in a uniform gravitational field (such as on Earth), is:








v = fluid velocity along the streamline


g = acceleration due to gravity on Earth


h = height from an arbitrary point in the direction of gravity


p = pressure along the streamline


ρ = fluid density


These assumptions must be met for the equation to apply:





Inviscid flow − viscosity (internal friction) = 0


Steady flow


Incompressible flow − ρ = constant along a streamline. Density may vary from streamline to streamline, however.


Generally, the equation applies along a streamline. For constant-density potential flow, it applies throughout the entire flow field.


The decrease in pressure simultaneous with an increase in velocity, as predicted by the equation, is often called Bernoulli's principle.





The equation is named for Daniel Bernoulli although it was first presented in the above form by Leonhard Euler.








[edit] Compressible flow


A second, more general form of Bernoulli's equation may be written for compressible fluids, in which case, following a streamline:








= gravitational potential energy per unit mass, in the case of a uniform gravitational field


= fluid enthalpy per unit mass, which is also often written as (which conflicts with the use of in this article for ';height';). Note that where is the fluid thermodynamic energy per unit mass, also known as the specific internal energy or ';sie';.


The constant on the right hand side is often called the Bernoulli constant and denoted b. For steady inviscid adiabatic flow with no additional sources or sinks of energy, b is constant along any given streamline. More generally, when b may vary along streamlines, it still proves a useful parameter, related to the ';head'; of the fluid (see below).





When shock waves are present, in a reference frame moving with a shock, many of the parameters in the Bernoulli equation suffer abrupt changes in passing through the shock. The Bernoulli parameter itself, however, remains unaffected. An exception to this rule is radiative shocks, which violate the assumptions leading to the Bernoulli equation, namely the lack of additional sinks or sources of energy.How to calculate velocity in m/s from gas/oil flow in pipelines, in differant units of flow?
There are several specialized formulas for calculating the flow of gas in pipelines.





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