Abstract: A self-cleaning assembly for a vertically oriented sight tube interposed in a flow line is suspended from a bearing member for free rotation within the sight tube. The assembly includes a support member having a pair of cleaning members suspended remote from the tube axis. A flow directing assembly upstream from the sight tube (either above or below) sets up a spiral flow pattern within the sight tube. This spiral flow pattern causes the cleaning assembly to spin, and centrifugal force pushes the cleaning members against the interior wall of the sight tube to effect a scouring action thereon.

Abstract: A continuous flow mixer includes an impeller assembly and a mixing chamber formed from concentric inner and outer tubes. The inner tube is radially constrained but is movable along the axis of the outer tube. The impeller assembly is at one end of the mixing chamber and draws fluid along the interior of the inner tube and discharges the fluid to the annular region between the inner and outer tubes. The fluids are introduced into the mixing chamber at the end remote from the impeller assembly and the mixed solution exits the mixing chamber substantially centrally of its length from the annular region.