One of the most effective ways to transport solid material is in the form of slurries. Although the technology of solids pipelining is quite advanced the underlying principles have not yet been formulated past the semiempirical stage. In this paper new approach to slurry flow both in laminar and turbulent regimes is outlined with emphasis on the approach for turbulent slurry flow without deposits which does not rely on subdivisions of slurries into arbitrary groups and which is based on identifiable mechanisms of energy loss. Some aspects of slurry systems and pumps are discussed.