Abstract: This invention relates to a concentrator for the recovery of a water-immiscible liquid pollutant floating on the surface of a sheet of water, which comprises a duct of flexible material having an inlet orifice with a larger and a small dimension along mutually perpendicular axes for locating with its larger dimension substantially parallel to the surface of the sheet of water, the shape of the duct varying along its length such that at its end remote from the inlet orifice it has a section with a larger and a smaller dimension along mutually perpendicular axes, its larger dimension being in a plane substantially perpendicular to the surface of the sheet of water when the larger dimension of the inlet orifice is parallel to the surface of the sheet of water, and at least one outlet orifice for the outflow of the liquid pollutant from the concentrator, and to systems using such concentrators.

Abstract: A safety reservoir is disclosed which is particularly suitable for use as a fuel tank in land, air or marine vehicles and which comprises a flexible inner reservoir of elastomeric sheet material contained within a rigid chamber formed of at least two part-shells joined together by means capable of releasing the shell parts under the effect of a predetermined impact or force. Self closing valve means of deformable elastomeric material are provided at inlet and outlet orifices to the flexible inner reservoir for sealing the reservoir upon removal of filling or emptying tubes or nozzles therefrom. Also disclosed is the use of a liquid impervious film of low tensile strength within the inner reservoir.