Beggs-Brill Pressure Drop Calculator
Calculate multiphase pressure drop, flow pattern, and liquid holdup using the Beggs-Brill (1973) correlation for inclined pipes.
Pipe & Flow Parameters
90° = vertical, 0° = horizontal
Flow Rates
Fluid Properties
Total Pressure Drop
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psi
Flow Pattern
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Liquid Holdup
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Pressure Gradient
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psi/ft
Mixture Velocity
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Superficial Liquid Vel
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Superficial Gas Vel
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Input Liquid Fraction
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How this was calculated
Beggs-Brill (1973): Empirical correlation for multiphase flow in pipes at any inclination angle. Determines flow pattern (segregated, intermittent, distributed, or transition), calculates liquid holdup with inclination correction, and computes pressure gradient including elevation, friction, and acceleration terms.
Flow Pattern Map: Based on Froude number (NFR) and input liquid fraction (lambda_L). Boundaries defined by L1, L2, L3, L4 functions.
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Book a free strategy call →Understanding Beggs-Brill Multiphase Flow
The Beggs-Brill correlation is one of the most widely used methods for calculating pressure drop in multiphase (gas-liquid) flow through pipes at any inclination. It accounts for the four major flow patterns observed in inclined pipe flow: segregated (stratified/annular), intermittent (slug/plug), distributed (bubble/mist), and transition. Each pattern has distinct holdup and friction characteristics.
The correlation first determines horizontal holdup using empirical coefficients, then applies an inclination correction factor. The total pressure gradient combines elevation (dominant in vertical flow), friction, and acceleration (usually negligible) components. Built by Groundwork Analytics.