Slurry Pipe Velocity & Settling Calculator
Determine Durand critical deposition velocity, safe slurry transport flow rates, and pipeline friction head loss to prevent pipe sanding.
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How Slurry Critical Settling Velocity Works
Hydraulic transport of sand, ore slurry, and tailings requires maintaining sufficient fluid turbulence to prevent dense mineral grains from settling into a stationary bed on the pipe floor:
Durand Critical Velocity V_L = F_L × √[ 2 × g × D × (S_s - S_l) / S_l ]
Safe Operating Velocity = 1.15 × V_L to 1.30 × V_L
Volumetric Concentration C_v = C_w / [ S_s - C_w × (S_s - 1) ]
Slurry Mixture S.G. = 1 + C_v × (S_s - 1)
The Sanding Disaster vs Wear Penalty: Operating below $V_L$ creates a stationary bed that chokes the pipeline (sanding off the pipe), which requires cutting the line with torches. However, operating above $1.40 imes V_L$ increases abrasive pipe wall wear by the cube of velocity ($V^3$), wearing out steel pipes in months!
Frequently Asked Questions
What is the Durand critical deposition velocity?
The Durand velocity ($V_L$) is the boundary speed below which solid particles in a liquid slurry settle out of turbulent suspension and form a stationary or sliding bed on the bottom of horizontal pipes, causing catastrophic pressure spikes and pipe blockages.
Why does pipe wear scale with the cube of velocity ($V^3$)?
Abrasive slurry wear is governed by kinetic energy ($E_k = rac{1}{2}mv^2$) combined with collision frequency (which also increases linearly with speed). Doubling your slurry velocity increases abrasive wall erosion rates by roughly eightfold ($2^3 = 8 imes$).
What pipe lining materials are best for abrasive slurry service?
High-Density Polyethylene (HDPE) and natural gum rubber-lined steel pipes are industry standards. Soft elastomeric rubber deforms elastically upon particle impact, shedding the kinetic energy of sharp silica particles without tearing.