 Pipe Calculations
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Steam Pipe Calculation
The pressure loss in the steam pipes is calculated. It is necessary to add the local loss of parts in the elbow, tee.
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| Fluid |
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| Inlet pressure |
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| Nominal diameter |
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| Flow |
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| Length |
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m
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Not :
If pressure unit as bar G, mbar G etc, the inlet pressure is upper pressure.
if pressure unit as bar Abs, mbar Abs etc, the inlet pressure is absolute pressure.
The formula used is the Colebrook–White equation for turbulent flow (Re>4000). (Formula \ref{eu_Colebrook})
\begin{equation}\label{eu_Colebrook}
\frac{1}{\sqrt{f }}=-2\log \left ( \frac{2.51}{Re\sqrt{f}}+\frac{\varepsilon /D}{3.71} \right )
\end{equation}
From the Darcy-Weisbach equation (Formula \ref{darcy}), the friction loss along the pipe is found.
\begin{equation}\label{darcy}
\displaystyle{\Delta P=f\displaystyle\frac{L}{D}\displaystyle\frac{\rho v^{2}}{2} } \qquad \text{[Pa]}
\end{equation}
Here, \(\small f\) is the dimensionless friction coefficient, \(\small D\) is the inner diameter [m], \(\small Re\) is the dimensionless reynolt number, \(\small\varepsilon\) is the roughness [m], \( \small L\) is the pipe length [m], \(v\) is velocity [m/s], \(\rho\) is the dencity [kg/m3].
Literature : Thermophysical Properties of Fluid Systems, https://webbook.nist.gov/chemistry/fluid/ (19/03/2022)
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