What are the special considerations for slurry pipeline design?

Considerations include: minimum velocity to prevent settling (1-2 m/s for sand, varies with particle size/density), solids concentration affecting viscosity and flow behavior, abrasion/erosion at bends and restrictions, startup/shutdown procedures (prevent settling), pump selection (hardened wear parts, large clearances), and heterogeneous vs homogeneous flow regimes. Use specialized correlations (Durand, Wilson) for pressure drop. Large particles require higher velocities; fine particles may behave as homogeneous mixture at lower velocities.