Abstract: Industrial filtration apparatus for the separation of solids entrained in a fluid stream comprises: a flexible perforate filtering sleeve closed at one end such that fluid can pass through perforations in the sleeve but entrained solids of a predetermined size are retained within the closed end of the sleeve. The apparatus has a structure for holding the sleeve about a discharge pipe for the fluid at a point between the closed and open ends of the sleeve, and for restraining movement of the sleeve away from the pipe; the apparatus is adapted such that in response to a predetermined fluid (e.g. hydraulic) pressure within the sleeve between its closed end and the discharge pipe, the closed end is allowed to be displaced away from the discharge pipe, thereby drawing a portion of the sleeve nearer its open end into a position forward of the pipe to expose said portion to the fluid stream.

Abstract: A process and apparatus for the removal of oil from an oil in water emulsion, the apparatus comprising a vessel, means for passing the emulsion in an upward direction through the vessel and means for draining the vessel, a coalescer located in the vessel, the coalescer having a first face and a second face, means for moving the coalescer from a first position in which its first face is on the underside of the coalescer to a second position in which the second face is on the underside of the coalescer and vice versa, outlet means for the treated emulsion and means for removing coalesced oil droplets from the treated emulsion.