Abstract: A sampler for flowing liquid in, for example, a pipeline, said sampler comprising, a pump assembly situated, in use, within the flowing liquid, sampling means connected to said pump assembly to provide a sample of said liquid, drive means to operate said pump assembly, said drive means including driver means, mounted, in use, within said flowing liquid to be driven by the flowing liquid, whereby flowing liquid drives the driver means which in turn drives the drive means and the pump assembly.
Abstract: An in-line blender for blending components, in the form of liquid or other fluent materials including a pipeline having a plurality of injection points, each injection point being connected to a set of selector valves and each selector valve being connected to a separate component source. Only one of these selector valves at a time is connected to the injection point. Between the set of valves and the injection point there is mounted a metering apparatus in the form of a positive displacement pump and a meter 14.