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The deposing velocity is an important parameter in the designing of solid transportation in pipe; it represents the lowest speed at which transportation can operate corresponding to no solid particles remains in the reactor or pipe bottom. This minimal velocity has been investigated in several types of reactors in water treatment and solid transport. A Little importance has been given to loop reactors in liquid solid mixtures especially torus reactor which has significant advantages in chemical and biochemical process and mixing. In the present work solid-liquid suspension in torus reactor is investigated by the experimental determination of the just suspended speed Njs at which all the solid particles are completely suspended. For this purpose a modified method based on visual assessment have been used. The effect of solid loading (1–7%) and particle size (80–500 µm) and different solid density was carried out. The Njs is largely depending on concentration and density of solid particles, it presents a weak dependence on particles size. The determination of Njs seems necessary in solid transport and operations involving solid-liquid mixtures where the mass transfer is a limiting factor.